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2/1/2006 1 Gary Wang Gary Wang 25.353 Computer Aided Design and Analysis 25.353 Computer Aided Design and Analysis

Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Page 1: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

2/1/2006 1

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Gary WangGary Wang25.353 Computer Aided Design and Analysis25.353 Computer Aided Design and Analysis

Page 2: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

2/1/2006 2

����������������������������������������������������������������������������������������������������������������������������������������

Page 3: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

2/1/2006 3

��������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������

��������������������������������������������������������������������������������������������������������������������������������

�� In the 1960sIn the 1960s•• simple 2D drafting as its primary functionsimple 2D drafting as its primary function

�� In the middle 1960sIn the middle 1960s•• WireframeWireframe--based modeling as the extension of 2D drafting, based modeling as the extension of 2D drafting,

impossible for surface data representationimpossible for surface data representation�� In the early 1970sIn the early 1970s

•• SurfaceSurface--based modeling, insufficient for solid and volume based modeling, insufficient for solid and volume representation.representation.

�� In the middle 1970sIn the middle 1970s•• solid modeling, used in process planning, assembly planning, solid modeling, used in process planning, assembly planning,

computercomputer--aided engineering analysis, etc.aided engineering analysis, etc.

Page 4: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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��������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������

��������������������������������������������������������������������������������������������������������������������������������

�� In the middle 1980sIn the middle 1980s•• parametric modeling: parametric modeling: dimensiondimension--driven capabilitydriven capability

TodayToday•• KnowledgeKnowledge--based engineering systems for geometric based engineering systems for geometric

and nonand non--geometric product information, such as geometric product information, such as engineering rules, part dependences, manufacturing engineering rules, part dependences, manufacturing constraints, etc.constraints, etc.

•• integrated design, analysis and optimizationintegrated design, analysis and optimization•• concurrent engineering designconcurrent engineering design•• virtualvirtual--prototypingprototyping•• virtual engineering & enterprisevirtual engineering & enterprise

Page 5: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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����� ������!����������� ������!����������� ������!����������� ������!����������� ������!����������� ������!����������� ������!����������� ������!������

�� Geometric modeling is a means Geometric modeling is a means not not a goala goal1.1. designdesign2.2. analysisanalysis3.3. simulationsimulation4.4. mold makingmold making5.5. NC toolingNC tooling6.6. etc.etc.

Page 6: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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������������������� ���������������������������� ���������������������������� ���������������������������� ���������������������������� ���������������������������� ���������������������������� ���������������������������� ���������

�� ���� ���� ���� ���� ���� ���� ���� ��

Page 7: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

2/1/2006 7

���������������� ���������������������������� ���������������������������� ���������������������������� ���������������������������� ���������������������������� ���������������������������� ���������������������������� ������������

Page 8: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

2/1/2006 8

���������������� ����������������������������� ����������������������������� ����������������������������� ����������������������������� ����������������������������� ����������������������������� ����������������������������� �������������

Page 9: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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into aircraft engineturbulent flow

wall

cooling inletengine bay

wall

intakescoop

impinging droplets leadingto undesirable ice accretion

flowreversal

surface heatingqw

���������������� ������������������ ������������������ ������������������ ������������������ ������������������ ������������������ ������������������ ��

���������� ��������������� ��������������� ��������������� ��������������� ��������������� ��������������� ��������������� �����

Page 10: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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0.3 0.35x (m)

0.13

0.14

0.15

0.16

0.17

0.18

0.19

0.2

0.21

0.22

y(m

)

-0.680723 -0.680723

-0.518175

-0.355627

-0.030531

-0.030531

0.29

4565

0.294565

0.457113

0.619661

0.782209

0.9447571.26985

1.4324

1.4324

1.59495

CP1

CP2

CP3 CP4

CP5

CP6

CP7

X

Y

x 1

x 2

y 1

y 2

0.3 0.35x (m)

0.13

0.14

0.15

0.16

0.17

0.18

0.19

0.2

0.21

0.22

y(m

)

Mesh Generation in ANSYS

Heat Conduction Simulation in FEM

(Daepng Wang, Greg F. Naterer, Gary Wang, “Thermofluid Optimization of a Heated Helicopter Engine Cooling Bay Surface”, pp 73~86, Vol. 29, No. 2, Canadian Aeronautics and Space Journal, June, 2003)

B-Spline Modeling in Pro/ECP6

Page 11: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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���������������� ������������������������ ������������������������ ������������������������ ������������������������ ������������������������ ������������������������ ������������������������ ��������

(UM SAE Formula 2003)

Page 12: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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���������������� ����"�� ��������������������� ����"�� ��������������������� ����"�� ��������������������� ����"�� ��������������������� ����"�� ��������������������� ����"�� ��������������������� ����"�� ��������������������� ����"�� �����

Page 13: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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���������������� �������������������������� �������������������������� �������������������������� �������������������������� �������������������������� �������������������������� �������������������������� ����������

Ergonomics and accessibility test (Jack and Jill)

Page 14: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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#$��#$��%%���$��������������������������$�����������������������

��������������� �� �&��������������� �� �&

�� The Primary Capability The Primary Capability –– Generating Generating Perfect Scale Drawings Perfect Scale Drawings (This capability sets CAD (This capability sets CAD apart from other uses of computer)apart from other uses of computer)

�� Many Diverse CapabilitiesMany Diverse Capabilities•• 3D rendering3D rendering•• generation of design databasesgeneration of design databases•• facilitating engineering analysisfacilitating engineering analysis•• supporting manufacturing activitiessupporting manufacturing activities

Page 15: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Specific Functions of CAD Specific Functions of CAD (1)(1)

�� Geometric Modeling and RepresentationGeometric Modeling and Representation•• ComputerComputer--aided drafting aided drafting •• 33--D modeling of parts and assemblies (generation of design D modeling of parts and assemblies (generation of design

database)database)•• Customizing CAD systemsCustomizing CAD systems

�� Visualization Visualization •• Architecture view of a design (see 3 pictures)Architecture view of a design (see 3 pictures)•• Computer games and education programsComputer games and education programs

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Page 18: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Specific Functions of CAD Specific Functions of CAD (2)(2)

�� PrePre-- and Postand Post--interfaces to Finite Element interfaces to Finite Element Analysis ProgramsAnalysis Programs•• Automated mesh generation Automated mesh generation •• Graphical display of stress distribution (see figure)Graphical display of stress distribution (see figure)

�� Automated Automated TolerancingTolerancing•• Dimension relation analysisDimension relation analysis•• Tolerance analysisTolerance analysis•• Tolerance synthesisTolerance synthesis

�� Generation of Manufacturing Oriented DatabaseGeneration of Manufacturing Oriented Database

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Page 20: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Digitized Data RP Software (Preprocessor)

Rapid Prototyping Machine

Manufacturing

• CAD

• 3D Scan

• 3D Digitizers

• Verify and repair the STL file

• Add Support Structure

• Set operation parameters

STL File

Internal File

Rapid Prototyping – Direct manufacturing

Page 21: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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My lab; Welcome for touring

Page 22: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Specific Functions of CAD Specific Functions of CAD (3)(3)

�� Animation and SimulationAnimation and SimulationMechanism Mechanism CNC machiningCNC machiningRobot trajectory Robot trajectory Process and ProductionProcess and ProductionMovies, movies, movies ….

�� Design Automation (My research)Design Automation (My research)•• Design optimization Design optimization •• Design for manufacturing (A new course in our dept.)Design for manufacturing (A new course in our dept.)•• Design for automated assemblyDesign for automated assembly•• Concurrent engineering designConcurrent engineering design

�� Virtual (or Soft) PrototypingVirtual (or Soft) Prototyping�� Reverse EngineeringReverse Engineering

Page 23: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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BACK

Page 24: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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BACK

Page 25: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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BACK

Page 26: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Optimal Design of Silencer

(Phillips and Temro)

Page 27: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Custom Designed Pro/E Menu

BACK

Back

Video

Page 28: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Page 29: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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'�� (�'��������'�� (�'��������

1. What is the primary function of a CAD system?

2. What is the use of an interactive programming tool provided by most CAD systems?

3. What is reverse engineering?

4. What is design for manufacturing?

5. What info that rapid prototyping process requires as input?

6. Today’s CAD systems should support analysis and manufacturing (True or False).

Page 30: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Information Embedded in a Information Embedded in a CAD SystemCAD System

�� Graphical and Topological InformationGraphical and Topological InformationPart geometryPart geometryAssembly relationsAssembly relations

�� Textual InformationTextual InformationDimensionsDimensionsTolerances (dimensional & geometric)Tolerances (dimensional & geometric)MaterialsMaterialsSurface finishesSurface finishes

Page 31: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Tools Commonly Used in Tools Commonly Used in Computer Aided Design (1)Computer Aided Design (1)

�� Representing geometric shapeRepresenting geometric shapeComputer graphics (2D)Computer graphics (2D)Geometric modeling (3D)Geometric modeling (3D)

�� Interactive Graphical ProgrammingInteractive Graphical ProgrammingProgramming on different platformsProgramming on different platformsGraphical User InterfaceGraphical User Interface

�� Manipulating and storing design dataManipulating and storing design dataData structure designData structure designDatabase systemDatabase system

Page 32: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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Tools Commonly Used in Tools Commonly Used in Computer Aided Design (2)Computer Aided Design (2)

�� Generating feasible designs (automatically)Generating feasible designs (automatically)Knowledge reasoningKnowledge reasoningKnowledgeKnowledge--based systembased systemFuzzy logicFuzzy logicArtificial neural networksArtificial neural networks

�� Evaluating design alternatives and identifying Evaluating design alternatives and identifying the optimal design solutionthe optimal design solution

numerical optimizationnumerical optimizationfinite element methodfinite element methodcost modeling and analysiscost modeling and analysis

Page 33: Gary Wang 25.353 Computer Aided Design and Analysisgwa5/index_files/25.353/indexf_files/2... · 2006-02-01 · Mesh Generation in ANSYS Heat Conduction Simulation in FEM (Daepng Wang,

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)������)������

• History of CAD

• Functions of CAD in today’s engineering practice

• Information embedded in CAD

• Tools used in CAD