Transcription

Introduction to CAD/CAE25.353 Lecture SeriesGary Wang, Associate Professor, Ph.D., P. Eng.Department of Mechanical and Manufacturing EngineeringThe University of Manitoba1

OutlineTraditional Product Design ProcessConcurrent Engineering DesignWhat is CAD/CAE?What to learn in This Course?The Approach to Be Taken2

Key Issues of Product Designsover the HistoryIn the 1970s, costIn the 1980s, quality superseded costToday, “better, cheaper, quicker” “greener” “more flexible” 3

Traditional Engineering DesignThe design-make-test-redesign loop(Nanua Singh, 1996)4

Design Freedom and Knowledge(Daniel Schrage, et al., 1991)5

ProblemsSuboptimal design solutionCostly to changeSlow to response the market6

State-of-the-Art Technologiesand ConceptsConcurrent Engineering (CE)Computer-Aided Design (CAD)Computer-Aided Engineering (CAE)Computer-Aided Process Planning (CAPP)Computer-Aided Manufacturing (CAM)Design for “X” (Manufacturing, assembly,environment, etc.)Quality Engineering 7

State-of-the-Art Technologiesand Concepts (cont’d)RoboticsManufacturing Planning and ControlCellular ManufacturingJust-In-Time Manufacturing (JIT)Flexible Manufacturing Systems (FMSs)Enterprise IntegrationE-business, e-engineering 8

Concurrent Engineering (CE)CE is a systematic approach to the integrated,concurrent design of products and theirrelated processes, including manufactureand support. This approach is intended tocause the developers, from the outset, toconsider all elements of the product life cyclefrom conception to disposal, includingquality, cost, schedule, and userrequirements. (Pennell and Winner, 1989)9

Concurrent Engineering (contd.)(Nanua Singh, 1996)10

Advantages of CEProduct development time reduced up to 60%Field failure rates reduced up to 83%Engineering changes per drawing reduced up to15 timesEarly production engineering changes reducedby 15%Inventory items stocked reduced up to 60%Generally, cost reduced11

Challenges of CECharacteristics of the design processrelations among all concerned aspects in thedesign processVolume and Variety of life-cycle knowledgeThe design process involves a largeamount of both qualitative and quantitativeinformation12

Computer Aided Techniques for CECADPDMDFACAM, CAPPDFMERPMRPDFM(A): Design for Manufacturing (Assembly)MRP: Materials Requirement/Resource PlanningERP: Enterprise Resource PlanningPDM: Product Data Management13

What is CAD/CAE/CAM?“CAD/CAM has more potential toradically increase productivity thanany development since electricity.”— National Science Foundation’s Center for Productivity14

What is CAD?CAD is a technology concerned with theuse of computer systems to assist in thecreation, modification, analysis, andoptimization of a design (Groover and Zimmers1984).At this point, it is important to emphasizethat the computer does not change thebasic nature of the design process.15

Components of CADComputer Graphics(display)CADDesign ToolsGeometricModeling(analysis, rules,codes)(modeling)(Zeid, 1991)16

Unique Characteristics of CADPrecision ofelectronicgraphics mathematicalprocessing powerof a digitalcomputerProductDesign Knowledge17

What is CAE?CAE is a technology concerned with the useof computer systems to analyze CADgeometry, allowing designers to simulateand study how the product will behave sothat the design can be validated, refinedand, optimized. (Kunwoo Lee, 1999)18

Range of CAEKinematics Analysis: to determine motionpaths and linkage velocities in mechanism.Pro/E, Working ModelFinite Element Analysis (FEA): SolidMechanics analysis (stress/strain), HeatTransfer, Flow, and other continuous fields.Pro/Mechanica, ANSYS, CATIA, NASTRANComputational Fluid Dynamics (CFD): FluidSimulation.Fluent, Phoenix, CFX19

Quick Questions What is CAD?What is CAE?What does CAD, CAE, CAM stand for?Does CAD necessarily change the conventionaldesign process?What are the components of CAD?What is CE?Why CE?How does CAD/CAE/CAM help CE?20

What to learn?Computer graphicsGeometric modelingFinite element analysis21

Questions to be answeredWhat are the fundamental CAD techniques?Are you able to model a product using a CADtool?Could you justify your modeling strategy if youare asked to model a complicated surface, e.g.an airfoil?What is finite element analysis (FEA)?How to perform a FEA?Why you think your analysis result is credible?22

The Approach for 25.353 (1)LecturesIndustrial presentationsUnderstand ConceptsPracticeHands-on labsProjects and assignments23

The Approach for 25.353 (2)Learning the fundamental theory of computer graphics andgeometric modelingBasics of hardware and softwareGeometry transformation, curve and surface generationGeometric modelingUse of Matlab to generate geometryEmphasis on the understanding of basictechniques of computer graphics andgeometric modeling24

The Approach for 25.353 (3)Introducing the recent advance in Computer-AidedDesign and Modeling using a representativecommercial CAD system – Pro/Engineer– Feature-based design and parametricmodeling– Part and assembly modelingAdvanced applications of CAD25

The Approach for 25.353 (4)Learning basics of finite element analysis (FEA)and the state-of-the-art analysis toolPro/Mechanica Concepts of finite element analysis Basic elements and applicationsEngineering analysis integrated with CADand emphasis on problem solving26

Link with other coursesJOBSSAE Groups25.342 Vibrations andAcoustics25.350 StressAnalysis and Design25.486 347 Heattransfer25.349 AdvancedFluid Mechanics andDesign25.35325.484 CAM andRobotics25.222 Stressanalysis and design27

SummaryTraditional/Sequential DesignConcurrent Engineering/DesignDefinitions of CAD & CAEWhat to learn in this course?The approach to be taken28

Components of CAD Design Tools (analysis, rules, codes) CAD Geometric Modeling (modeling) Computer Graphics (display) (Zeid, 1991) 17 Unique Characteristics of CAD Precision of electronic . Introducing the recent advance in Computer-Aided Design and Modeling using a representative commercial