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Computer Aided Mechanical Design

This document provides an in-depth exploration of Computer-Aided Mechanical Design (CAD) as practiced within the MEMS Department at Rice University, focusing on the history and specific tasks involved. It covers essential areas such as geometric modeling, finite element analysis (FEA), computational fluid dynamics (CFD), documentation practices, and optimization techniques. Furthermore, the report includes insights on CAD tools, commercial product development, and various modeling techniques applicable in engineering. This resource serves as a guide for students and professionals interested in CAD methodologies.

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Computer Aided Mechanical Design

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  1. Computer Aided Mechanical Design • History at Rice • Tasks • Reports • Tools J. E. Akin Rice University, MEMS Dept.

  2. ME CAD Tasks • Geometric Modelling • Finite Element Analysis [FEA] • Computational Fluid Dynamics [CFD] • Drafting, Rapid Prototypes [STL] • Parts, Assemblies, Constraints • Mechanisms J. E. Akin Rice University, MEMS Dept.

  3. ME CAD Tasks • Continuous System Models & Controls • Function Optimization • Shape Optimization • Topological Optimization • Documentation • Manufacturing • … J. E. Akin Rice University, MEMS Dept.

  4. Finite Element Analysis • Thermal • Stress • Natural Frequencies • Dynamic Response • Buckling • Endurance • CFD … J. E. Akin Rice University, MEMS Dept.

  5. Documentation and Reports • Design report • Mass properties • Bill of materials • Assembly, operations • Engineering economics • Patents • Marketing ... J. E. Akin Rice University, MEMS Dept.

  6. Geometric Modeling • Curve models [wiring] • Surface models • Solid models • Sheet metal • Wireframes, shading, drafting • FE modeling J. E. Akin Rice University, MEMS Dept.

  7. FE Modeling • Line meshes • Surface meshes • Solid meshes • Loads • Restraints J. E. Akin Rice University, MEMS Dept.

  8. Commercial Product • Geometric systems • Finite Element Analysis (FEA) systems • Computational Fluid Dynamics (CFD) systems • Mechanism analysis… J. E. Akin Rice University, MEMS Dept.

  9. CAD Tools • Text editor, spread sheet, search engine • ME environments (Matlab…) • Computer languages • Optimization tools [functions, shapes] • Knowledge based systems (KBS) • Electronic reference books • Patents … J. E. Akin Rice University, MEMS Dept.

  10. Computer Languages • Procedural languages • Basic, C, C++, F95, Pascal, perl, … • Visual Basic, Visual C, Visual Fortran, … • Non-procedural languages • Case selectors (TK Solver) • Simulation standards (CSSL) J. E. Akin Rice University, MEMS Dept.

  11. Optimization Tools • User-defined functions (OptdesX) • Procedural language interface • Executable program interface • Limited parametric items in FEA (Ideas, Ansys) • Topological optimization (shapes) J. E. Akin Rice University, MEMS Dept.

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