汽车造型设计外文文献翻译、中英文翻译、外文翻译

到CAE方法它将节省大量的测试成本，及时指导车身的设计结构，提出优化方法; 有限元法已经成为在车身特性设计和分析过程中不可或缺的[3]。

在结构优化过程中，首先，敏感性分析应该是对的以设计变量的灵敏度来确定目标[4]然后根据灵敏度修改设计变量以获得最佳设计目标与约束条件。

设计变量的灵敏度与A轻量级优化方法相关其目标函数是由客观因素的变化来衡量的单位设计变量的变化，灵敏度分析是opti的基础可以根据敏感度进行结构分析，优化结构分析，这将节省大量的计算时间并改进优化因此，在工业中期望提供一种改进的轻型汽车车身结构，特别是车身框架，其保持所需的强度，刚度和稳定性特性，以满足乘客安全和车辆性能标准。

此外，身体结构应当可使用现有技术和材料制造，以实现减轻重量而不增加成本。

此外，主体结构应该能够减少总成分，以进一步降低成本和制造时间。

2灵敏度分析的基本理论从结构分析可以分为动态分析和静态分析两个方面，结构敏感性分析也可以分为动力敏感性分析和静态敏感性分析。

动态灵敏度分析包括特征值灵敏度分析，传递函数灵敏度分析和动态响应敏感性分析。

静态敏感性分析可以是压力，位移等。

对于车辆，灵敏度分析是指车身刚度强度，自由模式和敏感性分析的应变能，部分结构参数包括材料厚度和横截面转动惯量[5 |。

有两种计算灵敏度的方法，推导方法和伴随结构的方法。

直接推导法，是亲由胡力构成R.Kapoor M.P，然后由许多人开发和推广人们在广泛的领域。

直接推导法具有明显的物理意义概念，简单的数学理论方便计算可扩展从一阶敏感度到高阶灵敏度，因此是广泛的在工业领域[6]。

3 BIW扭转刚度分析汽车BIW的有限元模型由769 862组成元素包括三角形元素和四边形元素重量为371.2公斤。

为了比较车辆扭转刚度试验过程中的有限元分析模型需要使用直径为50 mm的梁单元进行模拟测试设备如图有限元边界条件分析模型如图1所示。

3，左右后方的震动塔都很硬点被限制在X，翻译DOF左右前方震动吸收塔受限于X方向DOF。

( 4 )计算机模拟冲压成形及虚拟试模技术:(5)模具制造技术,模块式冲压的突出优点在于能把冲压加工系统的柔性与高效生产有机的结合在一起。

柔性的含义较广, 如冲压件的几何形状的多种要求, 只要通过自由编程就可获得, 体现了加工形状的柔性。

又如既适用大批量单品种冲压件的生产, 更对小批量多品种加工发挥也表性。

概括而言,模块式冲压的持点是:(1)在冲压成形过程中可快速更換组合模具以提高生产效率,(2)由于具有带材的供带和矫带装置, 可省却另设上料下料工序,(3 )实现了大工件的不停机加工;(4)既能独立又能成系列的控制组合冲模动作, 能连续进行冲压加工;( 5)冲模具有可编和的柔性特点。

一种模块式冲压加工系统由一台带有控制功能模块式冷冲压的压力机、卷材带材送进装轩、带材矫正机及可编程进给装置等构成。

这种冲压系统在运行时可进行冲模横向位移、带材进给定位、冲模重复运行及自动调整下工步的冲模调整等多项功能。

由于在冲压过程中进行可编程冲压, 使这种模块式冲压系统能柔性地适应生产需求,能在相同带材上进行曲不同工件及批次的混合生产,实现不停机的串接式加工,还同时在工件西面冲压加工,极大地提高了工作效率,有资料表明, 模块式冲压成形使加工费用能下降至40%-50%。

当前模块式冲压装置的集成度是很高的, 在宽度为300MM 尺寸范围内可安排达35个模具, 通过冲模上端的顶板可对冲模进行独立式系列控制, 即形成冲模的集成控制。

整个系统的编程可在windows用户界面和菜単下实现,编程涉及模具沿者横向定位納的何服驱动定位,带材的检验矫正及纵向进给定位, 冲模的质量跟踪检验, 冲模的调整及状况监控等多功能。

当冲模重新配置成更換时,这些变化则会被参数并被控制系统所贮存, 以务下次査询和调用。

冲模数据包括有冲头及其组合标记, 冲头组合在模具中的 X、Y坐标位置及模具轴编号等信息。

l毫米冲压是指汽车车身冲压件的精度控制在0-1. OMM 的范围内,与过去制造业通行的误差2MM 相比, 是个非常大的提高。

设计汽车英文作文英文：As a car designer, I am often asked about my processand inspiration for creating new models. For me, designinga car starts with understanding the needs and desires ofthe target audience. This involves researching trends, analyzing market data, and even conducting focus groups to get a better sense of what people want.Once I have a clear understanding of the target audience, I begin sketching out ideas and concepts. This is where my creativity really comes into play. I try to think outside the box and come up with unique features anddesigns that will set my car apart from the competition.Of course, designing a car is not just about aesthetics. Functionality and safety are also key considerations. Iwork closely with engineers to ensure that my designs are not only visually appealing, but also practical and safe.One of my favorite parts of the design process is getting to see the final product come to life. Seeing my sketches and ideas transformed into a tangible, functioning car is incredibly rewarding.中文：作为一名汽车设计师，我经常被问及我创作新车型的过程和灵感来源。

汽车模型设计理念文案英文Title: The Art of Automotive Model Design Concept。

In the world of automotive design, every detail matters. From the sleek curves to the intricate interior features, every aspect of a car model is carefully crafted to embody the essence of beauty, functionality, and innovation. The design concept of automotive models goes beyond just creating a vehicle; it is about creating an experience that resonates with the drivers and passengers.The foundation of automotive model design concept lies in the fusion of art and engineering. It is about finding the perfect balance between form and function, where aesthetics meet practicality. Every line, every contour, and every material choice is meticulously chosen to evoke a sense of emotion and purpose. It is about creating a visual masterpiece that not only turns heads but also performs at the highest level.Furthermore, the design concept of automotive models is deeply rooted in innovation. It is about pushing the boundaries of what is possible, exploring new technologies, and redefining the future of mobility. From advanced aerodynamics to cutting-edge infotainment systems, automotive model design concept is about staying ahead of the curve and setting new standards for the industry.Moreover, the design concept of automotive models is about storytelling. It is about creating a narrative that reflects the brand's identity, values, and vision. Whether it is a luxury car that exudes elegance and sophistication or a rugged off-road vehicle that embodies adventure and resilience, every automotive model is a manifestation of a unique story waiting to be told.In conclusion, the design concept of automotive models is a testament to the artistry, innovation, and storytelling that goes into creating a vehicle. It is a harmonious blend of form and function, pushing the boundaries of what is possible, and reflecting the brand's identity. Ultimately, automotive model design concept is about creating a timeless masterpiece that captivates the imagination and leaves a lasting impression.。

The Auto Body General Arrangement Design Based on ErgonomicsModern car design emphasizes people-centered, safety, comfort has been the subject of car design and the pursuit of the goal, but the comfort, safety is directly related to people, the study of ergonomics in automotive applications more and more attention. In the car body the overall layout design process required to fully take into account the theoretical knowledge of ergonomics, ergonomics reasonable size to ensure that different populations car comfort, safety, ease of operation, and on and off has important significance .Car Body general arrangement is based on vehicle general arrangement design carried out, its ultimate goal is within the limited dimensions of the body assembly and arrangement of all components, and get the most of interior space and improve the market competitiveness of products. However, the workload of general arrangement car body, it takes a long time, if possible based on the theory of ergonomics and CATIA V5 knowledge engineering module as a tool for knowledge-driven car overall layout parametric design, will greatly improve the design efficiency and quality and shorten the design cycle.1 . Driver's seat arrangement1.1 Layout of driver's seatStudies have shown that the human body to take joint angle when seated directly affect the ride comfort of the occupants of subjective feelings. Human drive, ride comfort and fatigue and design joint angle is determined according to the posture of the body, and therefore, according to the joint angle comfortable all-sized mannequin positioned, re-evaluation of its vision encompasses, comfort and so on. Different types of cars, its cab and the cab floor height of different heights, the driver must take a position corresponding.Driver's seating position and vehicle size must be appropriate to ensure the driver a good forward visibility, in order to meet different driver sitting comfort, the seat position is generally designed to be adjustable. Driver's seating position design principle is to ensure forward visibility conditions, to determine the limits of the human body has a size (women's and men's 95th 5th body size) limits the driver's seating position, from which to determine the adjustment range of the seat position.1.2 The driver's seat position and stroke adjustment determinedDriver's seat through the seat reference point position is determined SgRP point. SgRP point is the design of the seat reference point specified by the manufacturer, taking into account all the adjustments of the seat forms (horizontal, vertical and tilt adjustment), seat reference point to determine the final position in normal driving or riding, it means that when 95th one hundred When quintile manikin placed on the seat as required, the actual H point shall coincide with the seat reference point SgRP. When the accelerator pedal, the driver's seat and steering wheel position arrangement completed, in order to visually check the driver has a good layout on the angle of the seat in a sitting position when normal driving is able to meet the requirements of ergonomics, through CATIA V5 software platform to perform determined that the driver sitting corner. CATIA V5 building blocks of the human body model and management standards can be established in a virtual environment digitized virtual human model, based on its mannequin database, can easily be generated directly each percentile male and female mannequin, which set up the body The method of the model, since it needs the measurement data greatly reduced, thereby reducing the human body model to establish the amount of time, material and financial resources, has great practical value.2. Drivers eyellipse and head profile envelope designMotorists eyellipse refers to the different body according to their wishes driver seat adjusted to the appropriate location, and the normal seated driving position, the position of their eyes statistical distribution pattern in the vehicle coordinate system. Eyellipse established as the driver of automobile vision capability provides a scientific vision of the origin of benchmarks for measuring and evaluating the quality of the driver's field of vision provides an effective method. Eyellipse can use car windscreen defrosting site OK, OK car windshield shade band position and design car mirror position and vision checked, and so on.Head profile envelope refers to the different body occupant in a normal sitting position to sit right on its head (including hair) of the envelope, which is used to determine the occupants of the head space in the design. The space between the occupant's head and the body structure of activities for ensuring the occupant's head, and the head has the necessary buffer space is important in the bumps and roll and so on.Referring to SAE standard position of driver eye and head oval profile envelope surface by the pedal position, seat position reference point, the position of the steering wheel center constraints, that position eyellipses and head profile envelope will be with pedal , different seats and steering wheel position disposed correspondingly change. In order to be able to accurately and easily reflect these constraintsCoordinate positioning eyellipse and head profile envelope surface in automobile body coordinate system can be set up in the above-mentioned constraints CATIA V5 platform, based on its parametric design model to drive complete different percentile eyellipse and head profile establish envelope surface of the package. Parametric design is driven by the size and characteristics of the drive in the form of an independent geometric constraints and a certain function formula relation to product design. Therefore, by giving a different value for each ergonomic size, it can easily get a new position coordinates eyellipse and head profile envelope surface and a different three-dimensional eyellipse percentile and head profile envelope surface model, thus analysis and comparison of different size under the model to determine the optimal value, thereby greatly reducing the workload modeling and improve work efficiency.3. Driver's field of vision designThe driver has a good view of the cars is to ensure ease of manipulation and with the importance of safety conditions, depending on the field of vision of the position of the seat, the structure of the seat and backrest height and tilt angle, window size, shape and arrangement of pillars , hood and fender shapes, and so on. By eyellipse can design and check the driver's front and rear blind spot size, traffic lights vision and car windscreen squeegee device sweeps an area, but also be able to use eyellipses car dashboard and post calculation and blind check. When the cars with more than 80% of the traffic information is obtained by the driver's vision, so the use of the driver's field of vision eye ellipses design is important to guarantee the safety lane.4. Occupant's head and the car roof space arrangementHead space is the key to the overall arrangement of the general arrangement need to determine the size of the body, the method is used SgRP prevailing point of H61-1 and H61-2to judge the size of the head space. Head space, the greater the passengers in the car space, comfortDegree better, but the resulting total vehicle height greater flow line models will be destroyed, aerodynamic deteriorated. Currently, SgRP point rear seat and head profile envelope surface position after arrangement is completed, according to the effective headroom dimensions H61-1, H61-2 experience, taking into account the size of the Ukrainian head gap 8, H41-1, Ukraine 9, H41-2 combined with dynamic styling and aerodynamic requirements can be finalized car roof height. Meanwhile, the head profile envelope surface is after taking into account normal hair spatial statistics out, in determining the size of the head space also need to consider wearing a hat, car bumps, space crew headdress and normal activities require.5. CATIA knowledge engineering and parametric technologyIn the body during general arrangement, each member of the body is arranged to be understood as to satisfy certain constraints (such as internal body size, passenger space, parts and accessories positional parameters, etc.), its program arrangement optimization process, requiring to be checked arrangement, consultation and modify repeated. If you modify each program must change the overall layout model the entire body, then it will undoubtedly take enormous time and energy, affecting the progress of the vehicle design. Because of this, CATIA V5 knowledge engineering and parametric design technology reflects its great value.CATIA V5 can be "knowledge" to the parameters, formulas, rules, checks, design tables and other forms. In the product design process, all product-related information collected, such as industry standards, corporate standards, design specifications, dimensions associated size constraints, features related design experience, material requirements, manufacturing processes and similar products to be classified information, , abstract and improve the composition of a product design knowledge base, by the definition reflect the product characteristics of knowledge between dependency and constraint knowledge rules relationships form the basis of the knowledge driven product design to achieve product parameters, intelligent design .Parametric design is driven by the size of the graphics driver or modify drawing state inthe graphic design, the main idea is to use geometric constraints, engineering equations and relationships to describe the shape characteristics of the product model. CATIA V5 parametric design layout to achieve a total body size is automatically updated and optimized to avoid duplication of work, it is the product variability, reusability, parallel design provide means by which designers can easily change models generate serialization products, improve production efficiency.6. ConclusionErgonomics is the physiological and psychological characteristics of people, studies the people, machines, relationships and interactions of environmental laws in order to optimize the man-machine system of a discipline whose goal is to make people feel that the use of a mechanical process safe, healthy, comfortable and efficient. By the ergonomics theory and CATIA V5 knowledge engineering and parametric technology, reducing the previous model Work positioning and reduce errors by hand drawing model diagram caused, shorten design cycles, reduce design costs; theory based on ergonomics to CATIA V5 as a tool for the average car driver seat arrangement method, eyellipses and the importance of head profile envelope surface of the application as well as knowledge engineering and parametric design technology in general arrangement design has also been discussed and studied.基于人机工程学的车身设计现代轿车设计强调以人为中心，安全性、舒适性一直是轿车设计的主题和追求的目标，而舒适性、安全性直接与人相关，所以研究人机工程学在汽车上的应用越来越受到重视。

汽车模型设计理念文案英文Title: The Concept of Car Model Design Philosophy。

Car model design is not just about creating a vehicle that looks good, it's about embodying a philosophy that reflects the values and aspirations of the brand, the designer, and the consumer. The design philosophy behind a car model encompasses a range of elements, including form, function, innovation, and sustainability.Form is one of the most important aspects of car model design philosophy. The shape, lines, and proportions of a vehicle should not only be visually appealing but also serve a purpose. A well-designed car model should be aerodynamic, efficient, and practical, while also conveying a sense of style and character.Function is another key component of car model design philosophy. A car should be designed with the needs and desires of the consumer in mind. This means considering factors such as comfort, safety, and convenience, as well as technological advancements that enhance the driving experience.Innovation is at the heart of car model design philosophy. A great car model should push the boundaries of what is possible, incorporating new materials, technologies, and features that set it apart from the competition. Whether it's a revolutionary powertrain, a cutting-edge infotainment system, or a groundbreaking design feature, innovation is essential to creating a car model that captures the imagination and sets new standards.Sustainability is an increasingly important consideration in car model design philosophy. As the world becomes more environmentally conscious, car manufacturers are under pressure to create vehicles that are eco-friendly and sustainable. This means using materials and production methods that minimize environmental impact, as well as developing alternative powertrains that reduce emissions and fuel consumption.Ultimately, the design philosophy behind a car model should be a reflection of the brand's values and vision, the designer's creativity and expertise, and the consumer's needs and desires. A well-executed car model design philosophy can result in a vehiclethat not only looks great but also performs well, incorporates innovative features, and contributes to a more sustainable future.。

Ultrasonic ranging system designPublication title: Sensor Review. Bradford: 1993.Vol.ABSTRACT: Ultrasonic ranging technology has wide using worth in many fields, such as the industrial locale, vehicle navigation and sonar engineering. Now it has been used in level measurement, self-guided autonomous vehicles, fieldwork robots automotive navigation, air and underwater target detection, identification, location and so on. So there is an important practicing meaning to learn the ranging theory and ways deeply. To improve the precision of the ultrasonic ranging system in hand, satisfy the request of the engineering personnel for the ranging precision, the bound and the usage, a portable ultrasonic ranging system based on the single chip processor was developed.Keywords: Ultrasound, Ranging System, Single Chip Processor1. IntroductiveWith the development of science and technology, the improvement of people’s standard of living, speeding up the development and construction of the city. Urban drainage system have greatly developed their situation is construction improving. However, due to historical reasons many unpredictable factors in the synthesis of her time, the city drainage system. In particular drainage system often lags behind urban construction. Therefore, there are often good building excavation has been building facilities to upgrade the drainage system phenomenon. It brought to the city sewage, and it is clear to the city sewage and drainage culvert in the sewage treatment system.Co mfort is very important to people’s lives. Mobile robots designed to clear the drainage culvert and the automatic control system Free sewage culvert clear guarantee robots, the robot is designed to clear the culvert sewage to the core. Control system is the core component of the development of ultrasonic range finder. Therefore, it is very important to design a good ultrasonic range finder.2. A principle of ultrasonic distance measurementThe application of AT89C51:SCM is a major piece of computer components are integrated into the chip micro-computer. It is a multi-interface and counting on the micro-controller integration, and intelligence products are widely used in industrial automation. and MCS-51 microcontroller is a typical and representative.Microcontrollers are used in a multitude of commercial applications such as modems, motor-control systems, air conditioner control systems, automotive engine and among others. The high processing speed and enhanced peripheral set of these microcontrollers make them suitable for such high-speed event-based applications. However, these critical application domains also require that these microcontrollers are highly reliable. The high reliability and low market risks can be ensured by a robust testing process and a proper tools environment for the validation of these microcontrollers both at the component and at the system level. Intel Plaform Engineering department developed an object-oriented multi-threaded test environment for the validation of its AT89C51 automotive microcontrollers. The goals of this environment was not only to provide a robust testing environment for the AT89C51 automotive microcontrollers, but to develop an environment which can be easily extended and reused for the validation of several other future microcontrollers. The environment was developed in conjunction with Microsoft Foundation Classes(AT89C51).1.1 Features* Compatible with MCS-51 Products* 2Kbytes of Reprogrammable Flash MemoryEndurance: 1,000Write/Erase Cycles* 2.7V to 6V Operating Range* Fully Static operation: 0Hz to 24MHz* Two-level program memory lock* 128x8-bit internal RAM* 15programmable I/O lines* Two 16-bit timer/counters* Six interrupt sources*Programmable serial UART channel* Direct LED drive output* On-chip analog comparator* Low power idle and power down modes1.2 DescriptionThe AT89C2051 is a low-voltage, high-performance CMOS 8-bit microcomputer with 2Kbytes of flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s high density nonvolatile memory technology and is compatible with the industry standard MCS-51 instruction set and pinout. By combining a versatile 8-bit CPU with flash on a monolithic chip, the Atmel AT89C2051 is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications.The AT89C2051 provides the following standard features: 2Kbytes of flash,128bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator and clock circuitry. In addition, the AT89C2051 is designed with static logicfor operation down to zero frequency and supports two software selectable power saving modes. The idle mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The power down mode saves the RAM contents but freezer the oscillator disabling all other chip functions until the next hardware reset.1.3 Pin Configuration1.4 Pin DescriptionVCC Supply voltage.GND Ground.Prot 1Prot 1 is an 8-bit bidirectional I/O port. Port pins P1.2 to P1.7 provide internal pullups. P1.0 and P1.1 require external pullups. P1.0 and P1.1 also serve as the positive input (AIN0) and the negative input (AIN1), respectively, of the on-chip precision analog comparator. The port 1 output buffers can sink 20mA and can drive LED displays directly. When 1s are written to port 1 pins, they can be used as inputs. When pins P1.2 to P1.7 are used as input and are externally pulled low, they will source current (IIL) because of the internal pullups.Port 3Port 3 pins P3.0 to P3.5, P3.7 are seven bidirectional I/O pins with internal pullups. P3.6 is hard-wired as an input to the output of the on-chip comparator and is not accessible as a general purpose I/O pin. The port 3 output buffers can sink 20mA. When 1s are written to port 3 pins they are pulled high by the internal pullups and can be used as inputs. As inputs, port 3 pins that are externally being pulled low will source current (IIL) because of the pullups.Port 3 also serves the functions of various special features of the AT89C2051 as listed below.1.5 Programming the FlashThe AT89C2051 is shipped with the 2 Kbytes of on-chip PEROM code memory array in the erased state (i.e., contents=FFH) and ready to be programmed. The code memory array is programmed one byte at a time. Once the array is programmed, to re-program any non-blank byte, the entire memory array needs to be erased electrically.Internal address counter: the AT89C2051 contains an internal PEROM address counter which is always reset to 000H on the rising edge of RST and is advanced applying a positive going pulse to pin XTAL1.Programming algorithm: to program the AT89C2051, the following sequence is recommended.1. power-up sequence:Apply power between VCC and GND pins Set RST and XTAL1 to GNDWith all other pins floating , wait for greater than 10 milliseconds2. Set pin RST to ‘H’ set pin P3.2 to ‘H’3. Apply the appropriate combination of ‘H’ or ‘L’ logic to pins P3.3, P3.4, P3.5,P3.7 to select one of the programming operations shown in the PEROM programming modes table.To program and Verify the Array:4. Apply data for code byte at location 000H to P1.0 to P1.7.5.Raise RST to 12V to enable programming.5. Pulse P3.2 once to program a byte in the PEROM array or the lock bits. The byte-write cycle is self-timed and typically takes 1.2ms.6. To verify the programmed data, lower RST from 12V to logic ‘H’ level and set pins P3.3 to P3.7 to the appropriate levels. Output data can be read at the port P1 pins.7. To program a byte at the next address location, pulse XTAL1 pin once to advance the internal address counter. Apply new data to the port P1 pins.8. Repeat steps 5 through 8, changing data and advancing the address counter for the entire 2 Kbytes array or until the end of the object file is reached.9. Power-off sequence: set XTAL1 to ‘L’ set RST to ‘L’Float all other I/O pins Turn VCC power off2.1 The principle of piezoelectric ultrasonic generatorPiezoelectric ultrasonic generator is the use of piezoelectric crystal resonators to work. Ultrasonic generator, the internal structure as shown, it has two piezoelectric chip and a resonance plate. When it’s two plus pulse signal, the frequency equal to the intrinsic piezoelectric oscillation frequency chip, the chip will happen piezoelectric resonance, and promote the development of plate vibration resonance, ultrasound is generated. Conversely, it will be for vibration suppression of piezoelectric chip, the mechanical energy is converted to electrical signals, then it becomes the ultrasonic receiver.The traditional way to determine the moment of the echo’s arrival is based on thresholding the received signal with a fixed reference. The threshold is chosen well above the noise level, whereas the moment of arrival of an echo is defined as the first moment the echo signal surpasses that threshold. The intensity of an echo reflecting from an object strongly depends on the object’s nature, size and distance from the sensor. Further, the time interval from the echo’s starting point to the moment when it surpasses the threshold changes with the intensity of the echo. As a consequence, a considerable error may occur even two echoes with different intensities arriving exactly at the same time will surpass the threshold at different moments. The stronger one will surpass the threshold earlier than the weaker, so it will be considered as belonging to a nearer object.2.2 The principle of ultrasonic distance measurementUltrasonic transmitter in a direction to launch ultrasound, in the moment to launch the beginning of time at the same time, the spread of ultrasound in the air, obstacles on his way to return immediately, the ultrasonic reflected wave received by the receiverimmediately stop the clock. Ultrasound in the air as the propagation velocity of 340m/s, according to the timer records the time t, we can calculate the distance between the launch distance barrier(s), that is: s=340t / 23. Ultrasonic Ranging System for the Second Circuit DesignSystem is characterized by single-chip microcomputer to control the use of ultrasonic transmitter and ultrasonic receiver since the launch from time to time, single-chip selection of 875, economic-to-use, and the chip has 4K of ROM, to facilitate programming.3.1 40 kHz ultrasonic pulse generated with the launchRanging system using the ultrasonic sensor of piezoelectric ceramic sensorsUCM40, its operating voltage of the pulse signal is 40kHz, which by the single-chip implementation of the following procedures to generate.puzel: mov 14h, # 12h; ultrasonic firing continued 200msHere: cpl p1.0; output 40kHz square wavenop;nop;nop;djnz 14h, here;retRanging in front of single-chip termination circuit P1.0 input port, single chip implementation of the above procedure, the P1.0 port in a 40kHz pulse output signal, after amplification transistor T, the drive to launch the first ultrasonic UCM40T, issued 40kHz ultrasonic pulse, and the continued launch of 200ms. Ranging the right and the left side of the circuit, respectively, then input port P1.1 and P1.2, the working principle and circuit in front of the same location.3.2 Reception and processing of ultrasonicUsed to receive the first launch of the first pair UCM40R, the ultrasonic pulse modulation signal into an alternating voltage, the op-amp amplification IC1A and after polarization IC1B to IC2. IC2 is locked loop with audio decoder chip LM567, internal voltage-controlled oscillator center frequency of f0=1/1.1R8C3, capacitor C4 determinetheir target bandwidth. R8-conditioning in the launch of the high jump 8 feet into a low-level, as interrupt request signals to the single-chip processing.Ranging in front of single-chip termination circuit output port INT0 interrupt the highest priority, right or left location of the output circuit with output gate IC3A access INT1 port single-chip, while single-chip P1.3 and P1.4 received input IC3A, interrupted by the process to identify the source of inquiry to deal with, interrupt priority level for the first left right after. Part of the source code is as follows:Receivel: push pswpush accclr ex1; related external interrupt 1jnb p1.1, right; P1.1 pin to 0, ranging from right to interrupt service routine circuitjnb p1.2, left; P1.2 pin to 0, to the left ranging circuit interrupt service routinereturn: SETB EX1; open external interrupt 1pop accpop pswretiright: …; right location entrance circuit interrupt service routineAjmp Returnleft: …; left ranging entrance circuit interrupt service routineAjmp Return3.3 The calculation of ultrasonic propagation timeWhen you start firing at the same time start the single-chip circuitry within the timer T0, the use of timer counting function records the time and the launch of ultrasonic reflected wave received time. When you receive the ultrasonic reflected wave, the receiver circuit output a negative jump in the end of INT0 or INT1 interrupt request generates a signal, single-chip microcomputer in response to external interrupt request, the implementation of the external interrupt service subroutine, read the time difference, calculating the distance. Some of its source code is as follows:RECEIVE0: PUSH PSWPUSH ACCCLR EX0; related external interrupt 0MOV R7, TH0; read the time valueMOV R6, TL0CLR CMOV A, R6SUBB A, #0BBH; calculate the time differenceMOV 31H, A; storage resultsMOV A, R7SUBB A, # 3CHMOV 30H, ASETB EX0; open external interrupt 0\POP ACCPOP PSWRETIFor a flat target, a distance measurement consists of two phases: a coarse measurement and a fine measurement:Step 1: Transmission of one pulse train to produce a simple ultrasonic wave.Step 2: Changing the gain of both echo amplifiers according to equation, until the echo is detected.Step 3: Detection of the amplitudes and zero-crossing times of both echoes.Step 4: Setting the gains of both echo amplifiers to normalize the output at, say 3 volts. Setting the period of the next pulses according to the: period of echoes. Setting the time window according to the data of step 2.Step 5: Sending two pulse trains to produce an interfered wave. Testing the zero-crossing times and amplitudes of the echoes. If phase inversion occurs in the echo, determine to otherwise calculate to by interpolation using the amplitudes near the trough. Derive t sub m1 and t sub m2.Step 6: Calculation of the distance y using equation.4、The ultrasonic ranging system software designSoftware is divided into two parts, the main program and interrupt service routine. Completion of the work of the main program is initialized, each sequence of ultrasonic transmitting and receiving control.Interrupt service routines from time to time to complete three of the rotation direction of ultrasonic launch, the main external interrupt service subroutine to read the value of completion time, distance calculation, the results of the output and so on.5、ConclusionsRequired measuring range of 30cm-200cm objects inside the plane to do a number of measurements found that the maximum error is 0.5cm, and good reproducibility. Single-chip design can be seen on the ultrasonic ranging system has a hardware structure is simple, reliable, small features such as measurement error. Therefore, it can be used not only for mobile robot can be used in other detection system.Thoughts: As for why the receiver do not have the transistor amplifier circuit, because the magnification well, integrated amplifier, but also with automatic gain control level, magnification to 76dB, the center frequency is 38k to 40k, is exactly resonant ultrasonic sensors frequency.6、Parking sensor6.1 Parking sensor introductionReversing radar, full name is "reversing the anti-collision radar, also known as" parking assist device, car parking or reversing the safety of assistive devices, ultrasonic sensors(commonly known as probes), controls and displays (or buzzer)and other components. To inform the driver around the obstacle to the sound or a moreintuitive display to lift the driver parking, reversing and start the vehicle around tovisit the distress caused by, and to help the driver to remove the vision deadends and blurred vision defects and improve driving safety.6.2 Reversing radar detection principleReversing radar, according to high-speed flight of the bats in thenight, not collided with any obstacle principles of design anddevelopment. Probe mounted on the rear bumper, according to different price and brand, the probe only ranging from two, three, four, six, eight,respectively, pipe around. The probe radiation, 45-degree angle up and downabout the search target. The greatest advantage is to explore lower than the bumper of the driver from the rear window is difficult to see obstacles, and the police, suchas flower beds, children playing in the squatting on the car.Display parking sensor installed in the rear view mirror, it constantlyremind drivers to car distance behindthe object distance to the dangerous distance, the buzzer starts singing, allow the driver to stop. When the gear lever linked into reverse gear, reversing radar, auto-start the work, the working range of 0.3 to 2.0 meters, so stop when the driver was very practical. Reversing radar is equivalent to an ultrasound probe for ultrasonic probe can be divided into two categories: First, Electrical, ultrasonic, the second is to use mechanical means to produce ultrasound, in view of the more commonly used piezoelectric ultrasonic generator, it has two power chips and a soundingboard, plus apulse signal when the poles, its frequency equal to the intrinsic oscillation frequency of the piezoelectric pressure chip will be resonant and drivenby the vibration of the sounding board, the mechanical energy into electrical signal, which became the ultrasonic probe works. In order to better study Ultrasonic and use up, people have to design and manufacture of ultrasonic sound, the ultrasonic probe tobe used in the use of car parking sensor. With this principle in a non-contactdetection technology for distance measurement is simple, convenient and rapid, easyto do real-time control, distance accuracy of practical industrial requirements. Parking sensor for ranging send out ultrasonic signal at a givenmoment, and shot in the face of the measured object back to the signal wave, reversing radar receiver to use statistics in the ultrasonic signal from the transmitter to receive echo signals calculate the propagation velocity in the medium, which can calculate the distance of the probe and to detect objects.6.3 Reversing radar functionality and performanceParking sensor can be divided into the LCD distance display, audible alarm, and azimuth directions, voice prompts, automatic probe detection function is complete, reversing radar distance, audible alarm, position-indicating function. A good performance reversing radar, its main properties include: (1) sensitivity, whether theresponse fast enough when there is an obstacle. (2) the existence of blind spots. (3) detection distance range.6.4 Each part of the roleReversing radar has the following effects: (1) ultrasonic sensor: used tolaunch and receive ultrasonic signals, ultrasonic sensors canmeasure distance. (2) host: after the launch of the sine wave pulse to the ultrasonic sensors, and process the received signal, to calculate the distance value, the data and monitor communication. (3) display or abuzzer: the receivinghost from the data, and display the distance value and provide differentlevels according to the distance from the alarm sound.6.5 Cautions1, the installation height: general ground: car before the installation of 45 ~55: 50 ~ 65cmcar after installation. 2, regular cleaningof the probe to prevent the fill. 3, do not use the hardstuff the probe surface cover will produce false positives or ranging allowed toprobe surface coverage, such as mud. 4, winter to avoid freezing. 5, 6 / 8 probe reversing radar before and after the probe is not free to swap may cause the ChangMing false positive problem. 6, note that the probe mounting orientation, in accordance with UP installation upward. 7, the probe is not recommended to install sheetmetal, sheet metal vibration will cause the probe resonance, resulting in false positives.超声测距系统设计原文出处：传感器文摘布拉福德：1993年超声测距技术在工业现场、车辆导航、水声工程等领域具有广泛的应用价值，目前已应用于物位测量、机器人自动导航以及空气中与水下的目标探测、识别、定位等场合。

汽车造型设计外文文献翻译、中英文翻译、外文翻译Car Modeling DesignWhen it comes to car modeling。

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it is undeniable that the appearance of a car is the most XXX。

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art。

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to meet the consumers' XXX。

To create a successful car model。

designers must consider a variety of factors。

such as the target audience。

the intended useof the car。

and the latest trends in the market。

They must also be XXX them into the design。

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the r design of a car is also XXX car model。

The r design must be nal and comfortable。

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the success of a car model depends on XXX is a complex process that requires a n of engineering knowledge。

Developing a vehicle is an arduous process of design and evaluation, trial and error - constant improvement and adaptation。

Initial design concepts go through a range of stages to bring them closer to realisation and modelling is key to evaluating a design at each stage.Modelling can take several forms. Traditionally, clay models have been used at various scales to help understand and resolve the form and proportions of a vehicle。

To varying degrees， this has been supplemented， sometimes even replaced， by CAD modelling。

Whilst clay is still a medium used to evaluate predominantly visual characteristics, CAD systems can additionally help evaluate other factors such as aerodynamics, impact scenarios and other physical considerationsClay ModellingClay modelling is one of the most established 3D visualisation techniques used in the automotive industry。

外文文献原稿和译文原稿A New Type Car -- Hybrid Electric VehicleWith skyrocketing fuel prices and changes in weather patterns, many car manufacturers claimed to develop the kind of vehicles that will increase the mileage and reduce the emissions. Hybrid car is a kind of vehicle which can meet above requirements. A hybrid car features a small fuel-efficient gas engine combined with an electric motor that assists the engine.The reasons of building such a complicated machine are twofold: to reduce tailpipe emissions and to improve mileage. Firstly, hybrid cars are good for the environment. They can reduce smog by 90 percent and they use far less gasoline than conventional cars. Meanwhile, hybrid cars burn less gasoline per mile, so they release fewer greenhouse gases. Secondly, hybrid cars are economical. Hybrid cars, which run on gas and electricity, can get up to 55 to 60 miles per gallon in city driving, while a typical SUV might use three times as much gas for the same distance! There are three reasons can mainly account for that: 1) Hybrid engines are much smaller than those on conventional cars. A hybrid car engine is to accommodate the 99% of driving time when a car is not going up hills or accelerating quickly. When extra acceleration power is needed, it relies on the battery to provide additional force. 2) Hybrid gasoline engine can shut off when the car is stopped and run off their electric motor and battery.3) Hybrid cars often recover braking energy. Electric motors could take the lost kinetic energy in braking and use it to charge the battery. Furthermore, hybrids are better than all-electric cars because hybrid car batteries recharge as you drive so there is no need to plug in. Most electric cars need to be recharged every 50-100miles. Also, most electric cars cannot go faster than 50-60 mph, while hybrids can.Hybrid cars bridge the gap between electric and gasoline-powered cars by traveling further and driving faster and hybrid gas-electric cars are proving to be a feasible alternative at a time of high gas prices. So, in my opinion, hybrid cars will have a bright future.How Does Hybrid Electric Vehicle Work？You probably own a gasoline or diesel-engine car. You may have heard of electric vehicles too. A hybrid vehicle or hybrid electric vehicle (HEV) is a combination of both. Hybrid vehicles utilize two or more sources of energy for propulsion. In the case of HEVs, a combustion engine and an electric motor are used.How it works depends on the type of drive train it has. A hybrid vehicle can either have a parallel or series or parallel-series drive train.Parallel HybridThe parallel hybrid car has a gas tank, a combustion engine, transmission,electric motor, and batteries.A parallel hybrid is designed to run directly from either the combustion engine or the electric motor. It can run using both the engine and the motor. As a conventional vehicle, the parallel hybrid draws its power from the combustion engine which will then drive the transmission that turns the wheels. If it is using the electric motor, the car draws its power from the batteries. The energy from the batteries will then power the electric motor that drives the transmission and turns the wheel.Both the combustion engine and the electric motor are used at the same time during quick acceleration, on steep ascend, or when either the engine or the motor needs additional boost.Since the engine is directly connected to the wheels in a parallel drive train, it eliminates the inefficiency of converting mechanical energy into electrical energy and back. This makes a very effective vehicle to drive on the highway.Series HybridThe series hybrid car also has a gas tank, a combustion engine, transmission, electric motor, and batteries with the addition of the generator. The generator can be the electric motor or it can be another separate component.The series configuration is the simplest among the 3. The engine is not connected to the transmission rather it is connected to the electric motor. This means that the transmission can be driven only by the electric motor which draws its energy from the battery pack, the engine or the generator.A hybrid car with a series drive train is more suited for city driving conditions since the engine will not be subjected to the varying speed demands (stop, go, and idle) that contributes to fuel consumption.Series-Parallel HybridThe series-parallel configuration solves the individual problems of the parallel and series hybrid. By combining the 2 designs, the transmission can be directly connected to the engine or can be separated for optimum fuel consumption. The Toyota Prius and the Ford Escape Hybrid use this technology.Honda’s hybridFor those of you who have toyed with the idea of buying a hybrid but were discouraged by the price, you are not alone. In fact, despite the growing concern for the environment, not to mention the skyrocketing price of gas, hybrid cars still only represent a small percentage of global car sales, and a major reason for this is the cost.Hybrids are considered the wave of the future because they not only reduce emissions, addressing the issue of climate change, but they get great gas mileage, an important consideration with the current price of oil. It should be noted that hybrids can also improve the power of the engine, which compromises any advantages in fuel efficiency and emissions. Whatever the application, however, the technology makes the cars more expensive.Because of this, they are the vehicle of choice for only a small niche of people who can afford them, and they currently enjoy a special status amongst the image conscious celebrity-set. For most average consumers, however, they are not an option.That may soon change.Honda Motor Corporation, one of the largest car manufacturers in the world and a leader in fuel efficient technology, has unveiled it’s plan to introduce a low-cost hybrid by 2009. If they can pull it off, they hope to make the hybrid a more mainstream car that will be more appealing to the general public, with the ultimate goal of achieving greater sales and broader appeal than their current incarnation.This, of course, is making Detroit nervous, and may signal a need for American car makers to start making greener and more fuel efficient vehicles, something they could afford to ignore in the past because hybrid cars weren’t worth their attention (due to such a small market share) while gas-guzzling SUVs have such high profit margins.Honda, meanwhile, has had to confront a growing need to compete with Toyota, which has not only grown to be the world’s largest automaker, but makes the car that has become synonymous with the hybrid movement, the Prius. Honda is therefore faced with the seemingly insurmountable task of challenging Toyota’s dominance in the market.Concurrently, Toyota is racing to lower production costs on the Prius, as well, which would hopefully result in a lower cost to the consumer. All eyes are on a potentially favorable car buyers market in 2009.In the meantime, with even adamant global warming naysayers warming up (no pun intended) to the possibilities of an ecological disaster on the horizon, maybe it’s time that we got over our need to drive huge SUVs and start moderating our fuel consumption.Then again, as gas prices hovering around $4.00 and with no ceiling in sight, we may have little choice in the matter.Engine Operating PrinciplesMost automobile dngines are internal combustion, reciprocating 4-stroke gasoline engines, but other types have been used, including the diesel, the rotary ( Wankel ) , the 2-srtoke, and stratified charge.Reciprocating means up and down or banck and forth, It is the up and down action of a piston in the cylinder blick, or engine block. The blick is an iron or aluminum casting that contains engine cylinders and passges called water jackets for coolant circulation. The top of the block is covered with the cylinder head. Which forms the combustion chanber. The bottom of the block is covered with an oil pan or oil sump.Power is produced by the linear motion of a piston in a cylinder. However, this linear motion must be changed into rotary motion to turn the wheels of cars of trucks. The piston is attached to the top of a connecting rod by a pin, called a piston pin or wrist pin. The bottom of the connecting rod is attached to the crankshaft. The connecting rod transmits the up-and-down motion of the piston to the crankshaft, which changes it into rotary motion.The connecting rod is mounted on the crankshaft with large beaings called rodbearings. Similar bearings, called main bearings, are used to mount the crankshaft in the block. Shown in Fig. 1-1The diameter of the cylinder is called the engine bore. Displacement and compression ratio are two frequently used engine specifications. Displacement indicates engine size, and compression ratio compares the total cylinder volume to compression chamber volume.The term stroke is used to describe the movement of the iston within the cylinder, as well as the distance of piston travel. Depending on the type of engine the operating cycle may require either two or four strokes to complete. The 4-stroke engine is also called Otto cycle engine, in honor of the German engineer, Dr. Nikolaus Otto, who first applied the principle in 1876. In the 4-stroke engine, four strokes of the piston in the cylinder are required to complete one full operating cycle. Each stroke is named after the action it performs intake, compression, power, and exhaust in that order, shown in Fig1-2.1、Intake strokeAs the piston moves down, the vaporized mixture of fuel and air enters the cylinder through open intake valve. To obtain the maximum filling of the cylinder the intake valve opens about 10°before t.b.c., giving 20°overlap. The inlet valve remains open until some 50°after b.d.c. to take advantage of incoming mixture.2、 Compression strokeThe piston turns up, the intake valve closes, the mixture is compressed within the combustion chamber, while the pressure rise to about 1Mpa, depending on various factors including the compression ratio, throttle opening and engine speed. Near the top of the stroke the mixture is ignited by a spark which bridges the gap of the spark plug.3、 Power strokeThe expanding gases of combustion produces a rise in pressure of the gas to some 3.5Mpa, and the piston is forced down in the cylinder. The exhaust valve opens near the bottom of the stroke.4、Exhust strokeThe piston moves back up with the exhaust valve open some 50°before b.d.d., allowing the pressure within the cylinder to fall and to reduce ‘back’pressure on the piston during the exhaust stroke, and the burned gases are pushed out to prepare for the next intake stroke.The intake valve usually opens just before the exhaust stroke. This 4-stroke cycle is continuously repeared in every as long as the engineremains running.A 2-stroke engine also goes through four actions to complete one operating cycle.However, the intake and the compression actions are combined in one seroke, and the power and exhaust actions are combined in the other stroke. The term2-stroke cycle or 2-stroke is preferred to the term 2-cycle, which is really not accurate.In automobile engines, all pistons are attached to a single crankshaft. The more cylinders an engine has, the more power strokes produced for cach revolution. This means that an 8-cylinder engine runs more smoothly bdcause the power atrokes arecloser together in time and in degrees of engine rotation.The cylinders of multi-cylinder automotive engines arranged in one of three ways. 1、Inline engines use a single block of cylinder.Most 4-cylinder and any 6-cylinder engines are of this design. The cylinders do not have to be vertical. They can be inclined either side.2、V-type engines use two equal bands of cylinders, usually inclined 60degrees or 90degrees from the cach other. Most V-type engines have 6 or 8 cylinders, although V-4 and V-12 engines have been built.3、Horizontally opposed or pancake engines have two equal banks of cylinders 180degreeas apart. These space saving engine designs are often air-cooled, and are found in the Chevrolet Carvair, Porsches, Subaus, and V olkswagens. Subaus design is liquid cooled.Late-model V olkswagen vans use a liquid-cooled version of the air cooled VWhorizontally opposed engine.译文新型汽车----混合动力汽车在油价飞涨的今天，汽车制造商被要求发展一种排放低，行驶里程长的汽车。