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Why/When is Taguchi Method Appropriate?

Why/When is Taguchi Method Appropriate?. Tip #3 Taguchi Method Appropriate for Concurrent Engineering. Friday, 4 th May 2001. Tip #3. Taguchi Method Appropriate for Concurrent Engineering (next 7 slides). Friday, 4 th May 2001. Noise Factors X. INTERNAL NOISE. EXTERNAL NOISES.

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Why/When is Taguchi Method Appropriate?

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  1. Why/When is Taguchi Method Appropriate? Tip #3 Taguchi Method Appropriate for Concurrent Engineering Friday, 4th May 2001

  2. Tip #3 Taguchi Method Appropriate for Concurrent Engineering(next 7 slides) Friday, 4th May 2001

  3. Noise FactorsX INTERNAL NOISE EXTERNAL NOISES Process / Product Diagram Y Z Control Factors Taguchi Method P-Diagram with Internal/External noises Friday, 4th May 2001

  4. Noise FactorsX EXTERNAL NOISES Process / Product Diagram Y VARIATIONS INTERNAL NOISE Z Control Factors Taguchi Method Effect of Internal/External noise on the output Y Friday, 4th May 2001

  5. Y1 Process / Product Stage #1 Process / Product Stage #2 Y2 VARIATIONS VARIATIONS Z Control Factors Z Control Factors Taguchi Method : Coupling 2 Process Stages • Variation in output of Stage #1acts as NOISE input to Stage #2 • STAGE #1 itself is made insensitive to all noises, • so that variations in its output Y1 are minimum • STAGE #2 is made insensitive to variations in output of Stage #1

  6. Noise FactorsX Noise FactorsX EXTERNAL NOISES EXTERNAL NOISES Y1 Process / Product Stage #1 Process / Product Stage #2 Y2 VARIATIONS VARIATIONS INTERNAL NOISE INTERNAL NOISE Z Control Factors Z Control Factors Taguchi Method Effect of Coupling 2 Process Stages on the output Y2

  7. Taguchi Method : Coupling 2 ROBUST Process Stages • STAGE #1 DESIGN OBJECTIVE : • Achieve insensitivity to all noises => min. variations in its output Y1 • Determine “adjustment factor” => to adjust level of Y1 • STAGE #2 DESIGN OBJECTIVE : • Achieve insensitivity to all noisesincluding variations in Y1 • => min. variations in its output Y2 • Determine “adjustment factor” => to adjust level of Y2 • Determination of an “adjustment factor at each stage” • allows easy adjustment of output levels at a later time, • say during integration of stages, without affecting variations

  8. IMPORTANT • Main purpose of conducting matrix experiments (using Orthogonal Arrays) • to achieve insensitivity to noise by determining the best settings of control factors • to identify the ‘adjustment factor’ • This is achieved by Taguchi’s 2-Steps • First step  minimize variance • Second step  to ‘adjust’ the mean-on-target

  9. 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 

  10. 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 

  11. 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 

  12. 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 

  13. 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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