workshop six sigma

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May 28, 2009Inventory #002670

Workshop

Six Sigma

DesignXplorer



Training ManualWorkshop

• 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

Depth_ds




2.RMB on Geometry to import Crane_Hook.agdb

3.RMB on Model and Update Parameter set will be added after update

1. Double click on Static Structural (Ansys) in Toolbox to start new session

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4.Double click on Model to open Mechanical application

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5.Highlight Mesh, set the element size to 10 mm and Generate Mesh

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6. Apply force of 10000 N 7. Apply fixed support

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Training Manual

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.

8.Define output parameters: Equivalent stress, Total deformation, and Safety factor.

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9. Solve

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Workshop




10. Go back to project page and double click on Six Sigma Analysis (SSA)

11. Double click on Design of Experiments (SSA)

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12. For every input parameter define standard deviation to 0.8 and distribution type as: Normal

Check the distribution function for every input parameter

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Training Manual

14. Preview and update DOE (SSA)

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13. Double click on Design of Experiments. By default DOE type is CCD

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Training Manual

16. Double click on Response Surface (SSA)

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16By default Response Surface Type is Full 2nd order Polynomials

17. Update Response Surface17




18. Click on Response

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19. Set Chart mode to 2D and show Total Deformation vs Back_ds

20. Set Chart mode to 3D and show Total Deformation vs. Back_ds vs. Bottom_ds

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Training Manual

21. Click on Spider to obtain Spider Chart

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22. Click on Local Sensitivity to obtain Local Sensitivity Chart

2323. Return to Project




24. Double click on Six Sigma Analysis in Toolbox

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25. Click on Six Sigma Analysis and set up Number of Samples to 10000

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26. Update Six Sigma Analysis26




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

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Training Manual

28. Enter 6.00 in the New field

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

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workshop six sigma

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