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

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

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

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

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

7. Taguchi Method Effect of Coupling 2 Process Stages on the output Y 2 Process / Product Stage #2 Z Control Factors X Noise Factors X Y 2 INTERNAL NOISE EXTERNAL NOISES VARIATIONS Process / Product Stage #1 Z Control Factors X Noise Factors X Y 1 INTERNAL NOISE EXTERNAL NOISES VARIATIONS

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

9. 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

10. More Tips Links below 16.Taguchi Method V a r i a n c e R e d u c t i o n Factor Effects 1 st Priority : V a r i a n c e R e d u c t i o n 2 nd Priority : Factor Effects “inner” “outer” 15. “inner” L9 array with “outer” L4 and L9 NoIsE arrays 14.Taguchi Method “inner” “outer” “inner” L18 array with “outer” L4 and L9 NoIsE arrays not 13.Taguchi Method Why/When is Taguchi Method not Appropriate? Friday, 3rd Aug 2001 Friday, 27 th July 2001 Friday, 20 th July 2001 Friday, 13 th July 2001 Tips 12, 11, 10 

11. More Tips Links below 12.Taguchi Method “inner” “outer” “inner” L8 array with “outer” L4 and L9 NoIsE arrays 11.Taguchi Method ALL Life-stages Useful at ALL Life-stages of a Process or Product 10.Taguchi Method “centering”“fine tuning” Performs Process “centering” or “fine tuning” Friday, 6 th July 2001 Friday, 29 th June 2001 Friday, 22 nd June 2001 Tips 9, 8, 7 

12. More Tips Links below NoIsE Tolerance Design 9.Taguchi Method Identifies the “right” NoIsE factor(s) for Tolerance Design 8.Taguchi Method Finds best settings to optimize TWO quality characteristics Simultaneously 7. Taguchi Method When to select a ‘Larger’ OA to perform “Factorial Experiments” Friday, 15 th June 2001 Friday, 8 th June 2001 Friday, 1 st June 2001 Tips 6, 5, 4 

13. More Tips Links below 6.Taguchi Method Using Orthogonal Arrays for Generating Balanced Combinations of NoIsE Factors approaching IDEAL value 5.Taguchi Method Signal-to-Noise Ratio for Quality Characteristics approaching IDEAL value 4. Taguchi Method improves " quality “ at all the life stages the design stage itself at the design stage itself Friday, 25 th May 2001 Friday, 18 th May 2001 Friday, 11 th May 2001 Tips 3, 2, 1 

14. More Tips Links below Concurrent Engineering 3.Taguchi Method Appropriate for Concurrent Engineering 2.Taguchi Method can study Interaction Noise Factors Control Factors between Noise Factors and Control Factors Signal-to-Noise Ratios Log form 1.Taguchi’s Signal-to-Noise Ratios are in Log form Friday, 4 th May 2001 Friday, 27 th April 2001 Friday, 6 th April 2001

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