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Workshop Six Sigma

Workshop Six Sigma. DesignXplorer. Depth_ds. Workshop. Goal Our first goal is to verify that the safety factor for the crane hook, when in service, is above 6 and to determine what parameters are important in maintaining that level.

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Workshop Six Sigma

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  1. WorkshopSix Sigma DesignXplorer

  2. Depth_ds Workshop • Goal • Our first goal is to verify that the safety factor for the crane hook, when in service, is above 6 and to determine what parameters are important in maintaining that level. • Knowing manufacturing tolerances will effect the hook’s structural performance we want to design to insure six sigma performance. • Model Description • 3D model of a crane hook. • The geometric variation for the 3 input parameters are known to vary approximately 1.5 mm. • We will inspect the Mechanical model and solve before moving to Design Exploration. Back_ds Bottom_ds

  3. Workshop 1. Double click on Static Structural (Ansys) in Toolbox to start new session 2.RMB on Geometry to import Crane_Hook.agdb 2 1 3 3.RMB on Model and Update 4 Parameter set will be added after update 4.Double click on Model to open Mechanical application

  4. Workshop 5.Highlight Mesh, set the element size to 10 mm and Generate Mesh 5 6. Apply force of 10000 N 7. Apply fixed support 7 6

  5. Workshop 9 8 8.Define output parameters: Equivalent stress, Total deformation, and Safety factor. 9. Solve When the solution is done note that the minimum safety factor is approximately 6.0. Since this near out standard goal we wish to include the uncertainties related to manufacturing in the calculation. To do this we’ll employ Design Exploration’s Six Sigma capabilities.

  6. Workshop 10. Go back to project page and double click on Six Sigma Analysis (SSA) 10 11. Double click on Design of Experiments (SSA) 11

  7. Workshop 12. For every input parameter define standard deviation to 0.8 and distribution type as: Normal 12 Check the distribution function for every input parameter

  8. Workshop 13 13. Double click on Design of Experiments. By default DOE type is CCD 14 14. Preview and update DOE (SSA) 15

  9. Workshop 16. Double click on Response Surface (SSA) 16 By default Response Surface Type is Full 2nd order Polynomials 17. Update Response Surface 17

  10. Workshop 18. Click on Response 18 19. Set Chart mode to 2D and show Total Deformation vs Back_ds 19 20. Set Chart mode to 3D and show Total Deformation vs. Back_ds vs. Bottom_ds 20

  11. Workshop 21. Click on Spider to obtain Spider Chart 21 22 22. Click on Local Sensitivity to obtain Local Sensitivity Chart 23. Return to Project 23

  12. Workshop 24. Double click on Six Sigma Analysis in Toolbox 24 25 25. Click on Six Sigma Analysis and set up Number of Samples to 10000 26. Update Six Sigma Analysis 26

  13. Workshop 27. Click on parameter P6 - Safety Factor Minimum and observe histogram and cumulative distribution function information as well as goodness of the fit 27

  14. Workshop One of our stated goals was to insure the safety factor of the hook at or above 6.0 In this case statistical information indicates there is approximately a 40% likelihood that the safety factor will fall below that goal. - Note: six sigma design requires a 99.9996% success rate You can assign different values for the standard deviation and compare obtained results 28 28. Enter 6.00 in the New field

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