Mechanical design pattern introduction

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Introduce the design patterns used in mechanical deisign, focus on Bottom-Up, Top-Down, Mixed and Module design. Hope my personal understanding can give those Mechanical designers some hints in their daily work. And I believe, right design pattern can help you greatly reduce your daily work.Thanks, Robin!

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Mechanical design pattern introduction

  1. 1. Mechanical Design PatternPrepared and Presented By: Robin Ji
  2. 2. Definition of Design Pattern• A design pattern in architecture and computer science is aformal way of documenting a solution to a design problem ina particular field of expertise.• The idea was introduced by the architect Christopher Alexander in the field ofarchitecture[1] and has been adapted for various other disciplines, includingcomputer science.[2]
  3. 3. 4 Design Patterns, we want to talk …• Bottom-Up• Top-Down• Mixed• Module design
  4. 4. Demos will be used…• Gear Box design…• Auto design…/Bicycle design…• Auto Engine design…
  5. 5. Gear Box ---- Bottom-Up
  6. 6. Gear Box ---- Bottom-Up• Design Object:1. Power Transmission2. Torque3. Revolution Speed4. And etc…
  7. 7. Gear Box ---- Bottom-Up• Design Method1. Engineering calculation2. Engine selection3. Transmission series planning4. Transmission ratio and gear pairs planning5. Gear Box general design6. And etc…
  8. 8. Gear Box ---- Bottom-Up• Mechanical design with CAD tool1. Gears, shafts, gear box ---- components2. Gear pairs and shaft ---- sub-assembly3. Sub-assembly and gear box ---- top assembly
  9. 9. Gear Box ---- Bottom-Up• Summary:We do it from bottom to top…It’s the traditional design pattern for most ofmechanical design conditions.And etc…Welcome your input!
  10. 10. Bicycle design ---- Top-Down
  11. 11. Bicycle design ---- Top-Down• Design Object:1. A bicycle shown in above slide…2. Fashion…3. Easy to driving…4. And etc…All above objects are not quite clear, but we know weneed a good bicycle.
  12. 12. Bicycle design ---- Top-Down• Design method1. Pencil sketch the architecture of the bicycle
  13. 13. Bicycle design ---- Top-Down• Design method [NX ---- Demo CAD tool]2. Convert pencil sketch to bicycle architect inMCAD
  14. 14. Bicycle design ---- Top-Down• Design method [NX ---- Demo CAD tool]3. From then on, Top-Down design method willbe used to design the main parts of this bicycle.WAVE Geometry Link and WAVE
  15. 15. Bicycle design ---- Top-Down• Design method [NX ---- Demo CAD tool]4. After we created almost all components onassembly environment, we got the bicycle, andfinished our design.
  16. 16. Bicycle design ---- Top-Down• Summary:We do it from Top assembly to eachcomponents…We do it from the concept that we need a goodbicycle.And etc…Welcome your input!
  17. 17. Auto design ---- We do it now
  18. 18. Auto design ---- We do it now• Pencil Sketch
  19. 19. Auto design ---- We do it now• Slice Sketch
  20. 20. Auto design ---- We do it now• CAD Sketch/CAD Modeling
  21. 21. Auto design ---- We do it now• Industrial design model
  22. 22. Auto design ---- We do it now• As we get the industrial design model, we willdivide it into different modules to do detaildesign. Until now, we use Top-Down designpattern in Auto design.• In fact for Auto design in module, such as newengine, we will use Bottom-Up. Obviously, wewill use mixed design pattern in the AutoDesign period.• What’s your comments?
  23. 23. Auto Engine Design ---- Module Design• For a certain auto type, it always has differentengines installed. How we do auto enginedesign? We will use some slides to describemodule design.
  24. 24. Auto Engine Design ---- Module Design• When we talked about module design, wetalked about selection more than that ofdesign.• For this type of issues, we always have clearinput and output.
  25. 25. Auto Engine Design ---- Module Design• Auto engine selection:• Size of the Engine <= Space left for Engine• Power of the Engine should be suitable to the sizeof the auto• Gasoline usage should obey local law• And etc…• With all above conditions, we can only pick out 3or 5 types of engine suit to this type of auto.
  26. 26. Auto Engine Design ---- Module Design• When we talked about module design, wetalked about series design than that of partdesign.• For example belt pulley of auto engine, wealways use parametric design for the diameterand width of the pulley.
  27. 27. Auto Engine Design ---- Module Design• Belt pulley parametric design:• Different size of pulley• Different ratio of pulley pair• Suit to different working conditions• With parametric design, this type of pulley canbe used in many types of auto engine andmeet their different requirements.
  28. 28. Summary• It’s a short introduction of design patternsused in Mechanical. It may not contain alldesign patterns, and may not cover all thefields of mechanical design.• With this slide, if you can get some hints ofdesign pattern and use it to review your dailyworking, then it deservers.• Welcome your input!

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