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Why/When is Taguchi Method Appropriate?

Learn about the Taguchi Method, including its application, benefits, and limitations. Discover how Taguchi's Signal-to-Noise Ratios can improve the analysis process. Explore different scenarios where Taguchi Method is appropriate and when it may not be suitable.

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Why/When is Taguchi Method Appropriate?

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  1. Why/When is Taguchi Method Appropriate? Tip #1 Taguchi’s Signal-to-Noise Ratios are in Log form Friday, 6 April 2001

  2. Earlier Tip Taguchi’s Signal-to-Noise Ratios are in Log form Friday, 6 April 2001

  3. Friday, 6-April-2001 Taguchi’s Signal-to-Noise Ratios are in Log form • very important reason • Taking “logarithm” improves ‘additivity’. Why? • Most functions in ‘nature’ follow the power-laws • Y = A exp (-Ea/kT) (EXPONENTIAL) • Y = B Ax . . . . ( a – RAISED – POWER X) • Y = B Xa . . . . ( X – RAISED – POWER a) • On taking logarithm  these become ‘additive’ • For example  Log10 ( BXa . exp(-Ea/kT) ) = Log10(B) + a. Log10(X) + (-Ea/kT) . Log10(e) • These are ‘additive’ for variables (Log10X) and (1/T)

  4. Friday, 6-April-2001 Taguchi’s Signal-to-Noise Ratios are in Log form • Let us say we are trying reduce ‘defects’ in a process using L9 array • The prediction will be, say, • 7 defects +- a few defects • The prediction error may be high due to errors in individual 9 experiments. Say it is +- 9 • 7 defects +-9  -2 to 17 defects ???????(-2 is problem) • Taguchi’s SN-Ratio for smaller-the-better •  = -10 Log10 ( 1/n  Yi2 ) • Its range is – infinity to +infinity • Extreme values are = +infinity  defects = 0 [average Y2 = 10(-/10)] • = - infinity  defects = infinity • Always predicts defects between allowed range of0 to infinity

  5. Taguchi Method 1st Priority : Variance Reduction2nd Priority : Factor Effects 15.“inner” L9 array with “outer” L4 and L9 NoIsE arrays Taguchi Method “inner” L18 array with “outer” L4 and L9 NoIsE arrays Taguchi Method Why/When is TaguchiMethod not Appropriate? Friday, 3rd Aug 2001 Friday, 27th July 2001 Friday, 20th July 2001 Friday, 13th July 2001 More Tips Links below Tips 12, 11, 10 

  6. Taguchi Method “inner” L8 array with “outer” L4 and L9 NoIsE arrays Taguchi Method Useful at ALL Life-stages of a Process or Product Taguchi Method Performs Process “centering” or “fine tuning” Friday, 6th July 2001 Friday, 29th June 2001 Friday, 22nd June 2001 More Tips Links below Tips 9, 8, 7 

  7. Taguchi Method Identifies the “right”NoIsEfactor(s) for Tolerance Design Taguchi Method Finds best settings to optimizeTWO quality characteristics Simultaneously 7. Taguchi Method When to select a ‘Larger’ OA to perform “Factorial Experiments” Friday, 15th June 2001 Friday, 8th June 2001 Friday, 1st June 2001 More Tips Links below Tips 6, 5, 4 

  8. Taguchi MethodUsing Orthogonal Arrays for Generating Balanced Combinations of NoIsE Factors Taguchi MethodSignal-to-Noise Ratio for Quality Characteristicsapproaching IDEAL value 4. Taguchi Methodimproves " quality “ at all the life stages atthe design stage itself Friday, 25th May 2001 Friday, 18th May 2001 Friday, 11th May 2001 More Tips Links below Tips 3, 2, 1 

  9. 3. Taguchi MethodAppropriate forConcurrent Engineering 2. Taguchi Methodcan studyInteraction between Noise Factors and Control Factors 1. Taguchi’sSignal-to-Noise Ratiosare inLog form Friday, 4th May 2001 Friday, 27th April 2001 Friday, 6th April 2001 More Tips Links below

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