(完整word版)广东工业大学控制工程试卷B(附答案)
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电液系统及控制考试题一、简略设计应用电液比例阀控制的速度控制回路。
画出原理图并加以说明。
该液压控制系统由控制计算机、比例放大器、电液比例方向阀、液压泵、液压缸、基座、负载、位移传感器和,数据采集卡组成,如图1所示。
图1 电液比例阀控制的速度控制回路液压系统采用定量泵和溢流阀组成的定压供油单元,用电液比例方向阀在液压缸的进油回路上组成进油节流调速回路,控制活赛的运行速度。
位移传感器检测出液压缸活塞杆当前的位移值,经A/D 转换器转换为电压信号,将该电压信号与给定的预期位移电压信号比较得出偏差量,计算机控制系统根据偏差量计算得出控制电压值,再通过比例放大器转换成相应的电流信号,由其控制电液比例方向阀阀芯的运动,调节回路流量,从而通过离散的精确位移实现对负载速度的精确调节。
二、说明使用电液闭环控制系统的主要原因。
液压伺服系统体积小、重量轻,控制精度高、响应速度快,输出功率大,信号灵活处理,易于实现各种参量的反馈。
另外,伺服系统液压元件的润滑性好、寿命长;调速范围宽、低速稳定性好。
闭环误差信号控制则定位更加准确,精度更高。
三、在什么情况下电液伺服阀可以看成震荡环节、惯性环节、比例环节?在大多数的电液私服系统中,伺服阀的动态响应往往高于动力元件的动态响应。
为了简化系统的动态特性分析与设计,伺服阀的传递函数可以进一步简化,一般可以用二阶震荡环节表示。
如果伺服阀二阶震荡环节的固有频率高于动力元件的固有频率,伺服阀传递函数还可以用一阶惯性环节表示,当伺服阀的固有频率远远大于动力元件的固有频率,伺服阀可以看成比例环节。
四、在电液私服系统中为什么要增大电气部分的增益,减少液压部分的增益?在电液伺服控制系统中,开环增益选得越大,则调整误差越小,系统抗干扰能力就越强。
但系统增益超过临街回路增益,系统就会失稳。
在保持系统稳定性的条件下,得到最大增益。
从提高伺服系统位置精度和抗干扰刚度考虑,要求有较高的电气增益K P,因此,液压增益不必太高,只要达到所需要的数值就够了。
材料成型及控制工程试卷纸B06专业英语(3)含答案广东工业大学考试试卷 ( B ) 课程名称: 专业英语(3)试卷满分 100 分考试时间: 2021 年_月_ 日 (第 13 周星期 3 ) 题号一二三四五六七八九十总分评卷得分评卷签名____ 复核得分复核签名____I、 Translate the e_pressions:(每小题1分,合计20分)1、合模力 1、2、分模面 2、3、注射容量3、 4、电火花加工 4、 5、名义载荷 5、 6、曲柄滑块机构 6、 7、集成制造 7、 8、塑性加工8、 9、双动压力机 9、 10、反印制模法 10、11、solids modeling 11、 12、dielectric fluid 12、13、closed-die forging 13、 14、blank holder slide 14、15、corner radius 15、 16、ready-made base 16、 17、pression mold 17、 18、stripper sleeve 18、 19、star-shaped runner 19、 20、perforating 20、学院:材料与能专业:20__4 材料加工()班学号:姓名:装订线 II、Translate the sentences into Chinese:(共5题,合计30分)1、Trimming may also be used to remove some of the draft material thereby producing straight side walls on the part.(6分)2、The power supply provides a voltage potential between the electrode and the die block such that, when the gap between the two is sufficiently small, a spark passes through this gap.(6分)3、The most important problem in the process of injection moldingis undoubtedly the correct design of the injection mold, because the molding shop has little influence, if any, on the construction of the machine.(6分)4、The flywheel , which is driven by an electric motor and “V” belts, stores energy that is used only during a small portion of the crank revolution, namely during deformation of the material.(6分)5)The strip steel stock used in steel rule dies varies between 1.4 to 4.22 mm thickness and the shearing edge side is grounded at a45°bevel.(6分)III、Translate the follog paragraph into Chinese:(50分)Rational for CAD/CAM (1) Increased Production.Productivity in the design process is increased by CAD/CAM.Time-consuming tasks such as mathematical calculations, datastorage and retrieval, and design visualization are handled by the puter, which gives the designer more time to spend on conceptualizing andpleting the design.In addition, the amount of time required to document a design canbe reduced significantly with CAD/CAM.All of these taken together means a shorter design cycle, shorter overall project pletion time, and a higher level of productivity.(2) Better Quality.Because CAD/CAM allows designers to focus more on actual design problem and less on time-consuming, nonproductive tasks, product quality improves with CAD/CAM.CAD/CAM allows designers to e_amine a wider range deignalternatives (e.g., product features) and to analyze each alternative more thoroughly before selecting one.In addition, because labor-intensive tasks are performed by the puter, fewer design errors occur.These all lead to better quality.(3) Better munication Design documents such as drags, part lists, bills of material, and specifications are tools used to municates the design to those who will manufactured it.The more uniform, standardized, and accurate these tools are, the better the munication, it improve munication.(4) mon Database This is one of the more important benefits ofCAD/CAM.With CAD/CAM, the data generated during the design of a product can be used in producing the product, this sharing of a mon database helps to eliminate the age-old “wall” separating the design and manufacturing function.(5) Reduced Prototype costs.With manual design, models and prototypes of a design must be made and tested, adding to the cost of the finished product.With CAD/CAM, 3-D puter models can reduce and, in some cases, eliminate the need for building e_pensive prototypes, such CAD/CAM capabilities as solids modeling allow designers to substitute puter models for prototype in many cases.广东工业大学试卷参考答案及评分标准 ( B ) 课程名称: 专业英语(3)。
1学 院: 专 业: 学 号: 姓 名:装 订 线广东工业大学考试试卷 ( B )课程名称: 控制工程 试卷满分 100 分考试时间: 2011 年 12 月2 日 (第 14 周 星期 五)题 号 一 二 三 四 五 六 七 八 九 十 总分评卷得分评卷签名复核得分 复核签名一、填空题(20分,每空1分,答案填在答题纸上)1、自动控制系统按输出变化规律可分为 、 和 。
2、某系统的传递函数为2360()56s G s s s +=++ ,其零点为 ,放大系数为 ,极点为 、 。
3、控制系统中常用的几种典型的实验输入信号为: 、 和 。
4、微分环节的传递函数为 ,惯性环节的传递函数为 。
5、 和 总称为系统的频率特性。
6、根据校正环节在系统中的连接方式,校正可分为: 、 和 。
7、采用PI 校正,系统的稳态误差 ,但相位裕度 ,稳定程度 。
二、(10分)求系统的微分方程,并求出系统的传递函数。
R 2C R 1u iu o2三、(10分)通过方框图的等效变换求取如下图所示系统的传递函数C(s )/R(s ),并绘制主要步骤的方框图。
+_+_+_()C s ()R s 1G 3G 2G 1H 2H +四、(10分)已知某控制系统的传递函数为10()10G s s =+,试求()1x t t =+时该系统的输出()y t 。
五、(10分)已知单位反馈系统的开环传递函数322550()5K s G s s s +=+。
当系统的输入信号为2()10x t t =+时,求系统的稳态误差?六、(10分)设单位负反馈控制系统的开环传递函数为1()1k G s s =+,当作用输入信号()3cos(230)i x t t =-时,试求系统的频率特性及稳态输出。
七、(10分)试绘制传递函数40(5)(2)()(40)s s G s s s ++=+的系统的对数幅频特性曲线。
八、(10分)系统的传递函数方框图如下图所示, 已知)2)(1(2)(++=s s s G ,试求闭环系统的传递函数,并用Routh 判据判断系统稳定时的K 的取值范围。
2008广东工业大学考试试卷( B )课程名称:单片机原理与接口技术试卷满分100分考试时间: 2008 年1 月16 日 (第20周星期三)一、填空。
(每空1分,共30分)1.MCS-51采用指令系统,最短指令机器码为字节,最长指令机器码为字节,因此其指令在PC“走飞”时,存在被拆分的风险,即把指令的当作执行。
2.通用CPU核心部件为单元,其作用是承担算术运算和。
3.当存储器芯片处于读状态时,片选信号CS必须处于状态,控制信号OE 必须处于状态。
4.MCS-51 MCU字长为位,含义是 (数据总线、地址总线、控制总线)宽度为位,最大寻址能力为 KB。
5.MCS-51 MCU含有个位定时/计数器,其中定时/计数器具有16位自动重装初值功能。
6.MCS-51 MCU外中断编程为和触发方式。
7.PCA中断入口地址为;其中的每一模块均可以工作在软件定时方式、、、四种方式。
8.对89C51RX兼容芯片ERAM读操作时,RD (有效、无效),此时P0口作为(I/O引脚、数据/地址总线AD7~AD0)。
9.当不使用外部ROM时,MCS-51芯片EA引脚 (接地、接VCC、悬空)。
10.在以MCS-51为核心的控制系统中,最好选择 (P0、P1~P3)I/O引脚构成4*4矩阵键盘,这样可省去上拉电阻和。
11.MCS-51复位后,SP寄存器为。
12.串行口方式不能作为串行通信口,而方式的波特率固定,仅与晶振频率有关。
二、指出下列指令中指定操作的寻址方式(每空1分,共15分)1. MOV R1, #16 ;目的操作数寻址方式为: ; 源操作数寻址方式为:2. MOV A, 4FH ;目的操作数寻址方式为: ; 源操作数寻址方式为:3. MOV B, @R0 ;目的操作数寻址方式为: ; 源操作数寻址方式为:4. MOV 20H.3, C ;目的操作数寻址方式为: ; 源操作数寻址方式为:5. DEC P1 ;操作数P1寻址方式为:6. MOVX A, @DPTR ;源操作数寻址方式为:;操作对象为7. MOVC A, @A+DPTR ;源操作数寻址方式为:;操作对象为8. JB P1.0, NEXT ;操作数NEXT寻址方式为: ;操作对象为(P1.0引脚、P1.0锁存器位)。
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的组成和微程序控制器相关知识完成该指令流程图中未完广东工业大学试卷用纸,共8页,第4页
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3(10分)
解:(1)各级中断服务程序中的各中断屏蔽码设置如表所示。
(2)5级中断同时发出中断请求,各级中断处理过程示意如图所示。
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广东工业大学试卷用纸,共2页,第2页。
广东工业大学考试试卷( A )课程名称:单片机原理与接口技术考试时间: 2007年1月26日 (第21周星期五)一、填空(每空1分,共25分)1.CPU核心部件为______,它承担了算术和_____运算。
2.MCS-51衍生型芯片89C51RD2内部RAM容量为_____,外部扩展RAM、____和___________读写方式相同,均使用MOVX指令。
3.指令由操作码和_______两部分组成,其中操作码决定了指令要执行的动作。
4.在由MCS-51构成的单片机应用系统中,如果没有外部程序存储器,则EA/Vpp引脚应(接地、接Vcc、悬空),PSEN引脚应(接地、接Vcc、悬空)。
5.根据指令特征,可将计算机指令系统分为RISC和两大类;其中MCS-51单片机采用指令系统。
6.在MCS-51中,执行了如下指令或程序段后,指出PSW寄存器内容(假设指令执行前PSW=00H,且各小题相互独立)。
(1) SUBB A,#5FH ;执行前A=87H,执行后PSW=______H(2) ANL 30H,#0FH ;执行后PSW=______H(3) DEC A;执行前A=00H,执行后A=___H;PSW=______H(4) CJNEA,#60H, NEXT1 ;执行前A=63H,执行后A=___H;PSW=______H(5) MOV A,#5FH ;执行后PSW=______H8.MCS-51响应定时/计数器T1溢出中断后,将从________单元中取指令码。
9.在MCS-51应用系统中,扩展的并行输出口应利用WR信号的_____(下降沿、上升沿)锁存由CPU输出的数据。
10.下面是定时/计数器T2中断服务程序片段(工作于自动重装初值方式),请在横线上填写相应指令,完善该中断服务程序。
PROC CTC2CTC2:PUSH Acc_______________INC 30HMOV A, 30HCJNE A, #60, NEXTNEXT:JC EXITMOV 30H, #0CPL P1.0EXIT:______________________________________________________RETIEND二、判断题(正确打√,错误打×) (每题1分,共10分)1.程序中伪指令在编译时将产生机器码。
广东工业大学试卷用纸,共页,第页A. ProvidedB. To provideC. In the caseD. Only if5.Kindly advise us of the steamers that call _______your port every month.A. atB. onC. inD. for6.It should be _____if you could immediately ________what quantity you can supply us at present.A. thankful, adviseB. appreciate, adviseC. appreciated, adviseD. appreciating, inform7.We thank you for your e-mail of November 25__B____your purchase of 10 M/T wildrice.A. confirmB. confirmingC. to confirmD. confirmed8.Subject to satisfactory arrangements ______terms and conditions, we should be pleasedto act as your sole agent.A. asB. as perC. as ifD. as to9.Our usual terms of payment are _______L/C and we hope they will be satisfactory______you.A. by, forB. by, toC. for, toD. for, with10.That helps to explain why businesses are setting up Net sites ______ profits aren`t yet very big.A. evenB. althoughC. even thoughD. why that11.The contract between a party who agrees to accept the risk and a party seeking protection from the risk a contract of _________.A. paymentB. productionC. shipmentD. insurance12.The customs duties act _______an essential leverage on regulating import and export behavior.A at B. as C. in D. to13.The Chinese word “运单” is translated as________.A .invoice B. B/L C. Waybill D. Contract14.When we want to buy something from other countries, we should make ________ first.A. an offerB. a inquiryC. a confirmationD. an acceptance15.Swedish Krona is the currency of ________ .A. SingaporeB. SpainC. Sri LankaD. Sweden16.Cairo is a city of _______.A. Sri LankaB. DenmarkC. EgyptD. Indonesia17.In the contract, usually there is a ________ clause to protect the buyer against loss from delay of the shipment of the goods.A. paymentB. shipmentC. penaltyD. quality18.This contract is made _______ Dalian International Economical Trade Co. and Kich Boro International Limited.A. amongB. betweenC. withD. by19.In foreign trade business, the trade terms CFR is often used, CFR is the abbreviation for _______.A. cost, insurance and freightB. commercial invoiceC. cost and freightD. consular invoice20.The person to whom the goods are shipped is called _______.广东工业大学试卷用纸,共页,第页A. the consignorB. the consigneeC. the shipperD. the manufacturerIII. Please explain the following proper nouns in English: (4 for 1, 20%)1. Exporting2. Enquiry3. Neutral packing4. Commission5. Charter partyIV. True or False. In the following statements you may find some are true, some false. Please mark T if the statement is true. If it is false, please mark F. (1 for 1, 15%)1.The quantity terms of goods is one the conditions of an effective sales contract. ( )2.In international trade, only the Metric System is allowed to indicate the quantity ofgoods. ( )3.If the parties to a sales contract do not in advance agree upon whether the quantity ofgoods is determined by gross weight or net weight, it will be determined by gross weight. ( ) weight refers to the actual tare of all the packing materials. ( )5.Conditioned weight is, in fact, the actual weight of the moisture of a certaincommodity. ( )6.According to the CISG, if the quantity delivered by the seller is greater than that ofthe contract, the buyer can refuse all the goods. ( )7. If a buyer has taken delivery of the excess quantity, he holds the right of not payingfor it. ( )8.The more or less Clause in a S/C allows the seller to deliver as more or as fewergoods as possible. ( )9.The only weakness of delivering fewer goods than stipulated is that the seller getsless paid. ( )10. The Beneficiary of a letter of credit may indicate his acceptance or rejection of theamendments till when he presents the relevant documents. ( )11. In our country goods for export must go through customs clearance. ( )12. When exporting goods on CFR, CPT or FOB terms, the seller must pay theinsurance premium. ( )13. According to UCP500, if documents are in correspondence with L/C’s stipulations,discrepancies between the documents themselves are allowed.( )14. Banks will refuse to pay if the documents which are not required by the L/C arepresented to them. ( )15. When documents are presented to the Opening Bank, they shall be examinedcarefully within one month. ( )V. Case Analysis. In this part there are 6 cases, three of which are in Chinese, three English. Please analyze the cases. If the case is in Chinese, you can answer in Chinese. If it is in English, you should answer in English.(5 for 1, 25%)1. 某公司以CPT条件出口一批冬装,公司按期将货物交给指定承运人,但运输途中由于天气原因延期一个月,错过了销售季节,买方由此向该公司提出索赔。