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Mechanical Design

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MechanicalDesign

Abstract:

Amachineisacombinationofmechanismsandothercomponentswhich

transforms,transmits.Examplesareengines,turbines,vehicles,hoists,printing

presses,washingmachines,andmoviecameras.Manyoftheprinciplesand

methodsofdesignthatapplytomachinesalsoapplytomanufacturedarticlesthat

arenottruemachines.Theterm"mechanicaldesign"isusedinabroadersense

than"machinedesign"toincludetheirdesign.themotionandstructuralaspects

andtheprovisionsforretentionandenclosureareconsiderationsinmechanical

design.Applicationsoccurinthefieldofmechanicalengineering,andinother

engineeringfieldsaswell,allofwhichrequiremechanicaldevices,suchas

switches,cams,valves,vessels,andmixers.

Keywords:MechanicalDesignmechanismsDesignProcess

TheDesignProcess

Designingstartswithaneedreal.Existingapparatusmayneedimprovements

indurability,efficiency,weight,speed,orcost.Newapparatusmaybeneededto

performafunctionpreviously

donebymen,suchascomputation,assembly,orservicing.Withtheobjective

whollyorpartly

Inthedesignpreliminarystage,shouldallowtodesignthepersonnelfullyto

displaythecreativity,noteachkindofrestraint.Evenifhashadmanyimpractical

ideas,alsocaninthedesignearlytime,namelyinfrontoftheplanblueprintis

corrected.Onlythen,onlythendoesnotsendtostopsuptheinnovationthe

mentality.Usually,mustproposeseveralsetsofdesignproposals,thenperform

thecomparison.Hasthepossibilityverymuchintheplanwhichfinallydesignated,

hasusedcertainnotinplansomeideaswhichaccepts.

Whenthegeneralshapeandafewdimensionsoftheseveralcomponents

becomeapparent,analysiscanbegininearnest.Theanalysiswillhaveasits

objectivesatisfactoryorsuperiorperformance,plussafetyanddurabilitywith

minimumweight,andacompetitivecost.Optimumproportionsanddimensions

willbesoughtforeachcriticallyloadedsection,togetherwithabalancebetween

thestrengthsoftheseveralcomponents.Materialsandtheirtreatmentwillbe

chosen.Theseimportantobjectivescanbeattainedonlybyanalysisbasedupon

theprinciplesofmechanics,suchasthoseofstaticforreactionforcesandforthe

optimumutilizationoffriction;ofdynamicsforinertia,acceleration,andenergy;of

elasticityandstrengthofmaterialsforstressanddeflection;ofphysicalbehavior

ofmaterials;andoffluidmechanicsforlubricationandhydrodynamicdrives.The

analysesmaybemadebythesameengineerwhoconceivedthearrangementof

mechanisms,or,inalargecompany,theymaybemadebyaseparateanalysis

divisionorresearchgroup.Designisareiterativeandcooperativeprocess,whetherdoneformallyorinformally,andtheanalystcancontributetophases

otherthanhisown.Productdesignrequiresmuchresearchanddevelopment.

ManyConceptsofanideamustbestudied,tried,andtheneitherusedor

discarded.Althoughthecontentofeachengineeringproblemisunique,the

designersfollowthesimilarprocesstosolvetheproblems.

Productliabilitysuitsdesignersandforcedinmaterialselection,usingthebest

program.Intheprocessofmaterial,themostcommonproblemsforfive(a)don't

understandornotuseaboutthelatestapplicationmaterialstothebest

information,(b)failedtoforeseeandconsiderthereasonableusematerialmay

(suchaspossible,designersshouldfurtherforecastandconsiderduetoimproper

useproducts.Inrecentyears,manyproductsliabilityinlitigation,theuseof

productsandhurttheplaintiffaccusedmanufacturer,andwonthedecision),(c)of

thematerialsusedallorsomeofthedata,data,especiallywhentheuncertainty

long-termperformancedataisso,(d)qualitycontrolmethodisnotsuitableand

unproven,(e)bysomecompletelyincompetentpersonschoosematerials.

Throughtotheabovefivequestionsanalysis,mayobtainthesequestionsis

doesnothavethesufficientreasonexistencetheconclusion.Mayforavoidthese

questionstothesequestionsresearchanalysestheappearanceindicatingthe

direction.Althoughusesthebestchoiceofmaterialmethodnottobeableto

avoidhavingtheproductresponsibilitylawsuit,designsthepersonnelandthe

industrycarriesonthechoiceofmaterialaccordingtothesuitableprocedure,

maygreatlyreducethelawsuitthequantity.

Mayseefromtheabovediscussion,thechoicematerialpeopleshouldtothe

materialnature,thecharacteristicandtheprocessingmethodhave

comprehensiveandthebasicunderstanding.

Finally,adesignbaseduponfunction,andaprototypemaybebuilt.Ifitstests

aresatisfactory,theinitialdesignwillundergocertainmodificationsthatenableit

tobemanufacturedinquantityatalowercost.Duringsubsequentyearsof

manufactureandservice,thedesignislikelytoundergochangesasnewideas

areconceivedorasfurtheranalysesbasedupontestsandexperienceindicate

alterations.Salesappeal.

SomeRulesforDesign

Inthissectionitissuggestedthat,appliedwithacreativeattitude,analysescan

leadtoimportantimprovementsandtotheconceptionandperfectionofalternate,

perhapsmorefunctional,economical,

anddurableproducts.

Tostimulatecreativethought,thefollowingrulesaresuggestedforthe

designerandanalyst.Thefirstsixrulesareparticularlyapplicablefortheanalyst.

合集下载

Reusing Mechanical Engineering Design

Reusing Mechanical Engineering Design

Reusing Mechanical Engineering Design

ZoE LACROIX

Department of Mechanical and Aerospace Engineering

Arizona State University

PO BOX 876106

Tempe A2 85287.6106, USA

Abstract-Design in mechanical engineering

is often re- design and involves retrieving

similar designs from various integrated design

repositories or paper drawings. To sup- port

designers a SyStem must provide to

previous valid designs that satisfy satisfy

requirements, functions, or Characteristics,

and allow the integration and transformation

of the retrieved designs into a new design

that meets the new design specifications.

Many approaches have been developed in

the past to support designers in accessing

dcsigns for their new design needs. Most of

ex- isting approaches typicalb store design

documents as files and provide an

英文套磁信

英文套磁信

英文套磁信

Dear Professor Yang:

I am very sorry to bother you and send this e-mail, but I really

wish to contact you. I am a graduate student majoring in

Mechanical Design in the Department of Machanics, Nantong

University (Nantong). I wish to pursue a doctoral degree in

Physics at your University. I have visited the homepage of the

"Laboratory for Nanotech". I am writing this letter to you to

introduce myself and query about the graduate programs at

NCCNM. Thank you very much for reading this email.

Born on SEP 10, 1979, I entered Huazhong Univ. of Science

and Technology (HUST) when I was 15 years old. I finished the

four-year undergraduate program in three years and achieved

my degree of B. Eng. (Optoelectronic Engineering) in June 1997

with the honor of "Outstanding Graduate". Then, I was admitted

to the Graduate School of Beijing University at the Department

Design Practise Notes

Design Practise Notes

SCHOOL OF MECHANICAL ENGINEERING

Mechanical Design Project

Resources

Design Practice Notes

Karl Dearn

Version 1.2

Design Project Resources School of Mechanical Engineering

Drs K D Dearn & M R Jolly The University of Birmingham

Issue 1.2 Page 2 of 16 Mechanical Design B

The information contained in these handouts is sufficient for the design exercise.

The sheets classify machine elements and cover power transmissions, belt and geared

drives, journal and rolling contact bearing, methods of location, design examples and

seals.

Students are advised to view catalogues of bearings and seals online – these can be

obtained from companies such as SKF and Walker. Both provide excellent catalogues..

Design Project Resources School of Mechanical Engineering

Drs K D Dearn & M R Jolly The University of Birmingham

机械工程师英语面试自我介绍

机械工程师英语面试自我介绍

机械工程师英语面试自我介绍

英文回答：

As a highly motivated mechanical engineer with a deep

understanding of mechanical design, analysis, and

simulation, I am eager to contribute my skills and

expertise to your esteemed organization. Throughout my

academic and professional journey, I have cultivated a

comprehensive foundation in mechanical engineering

principles and applied them to a wide range of projects.

During my undergraduate studies, I excelled in courses

such as Solid Mechanics, Thermodynamics, Fluid Mechanics,

and Machine Design. I also gained valuable hands-on

experience through internships at leading engineering firms,

where I participated in the design and development of

various industrial machinery and automotive components.

Upon graduating with honors, I embarked on a career as

a Mechanical Engineer at a renowned manufacturing company. In this role, I was responsible for the entire product