WhyWhen is Taguchi Method Appropriate Tip 3 Taguchi

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

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

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

Taguchi Method : Coupling 2 Process Stages • 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 Process / Product Stage #1 Y 1 VARIATIONS Process / Product Stage #2 Z Z Control Factors Y 2 VARIATIONS

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

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, say during integration of stages, without affecting variations

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

More Tips 16. Links below Taguchi Method e 1 st Priority : Va ia ce R duction 2 nd Priority : Factor Effects Friday, 3 rd Aug 2001 15. “inner” L 9 array with “outer” L 4 and L 9 No. Is. E arrays Friday, 27 th July 2001 14. Taguchi Method r n “inner” L 18 array with “outer” L 4 and L 9 No. Is. E arrays 13. Friday, 20 th July 2001 Taguchi Method Why/When is Taguchi Method not Appropriate? Friday, 13 th July 2001 Tips 12, 11, 10

More Tips 12. Taguchi Method Links below Friday, 6 th July 2001 “inner” L 8 array with “outer” L 4 and L 9 No. Is. E arrays 11. Taguchi Method Friday, 29 th June 2001 Useful at ALL Life-stages of a Process or Product 10. Taguchi Method Friday, 22 nd June 2001 Performs Process “centering” or “fine tuning” Tips 9, 8, 7

More Tips 9. Taguchi Method Links below Friday, 15 th June 2001 Identifies the “right” No. Is. E factor(s) for Tolerance Design 8. Taguchi Method Friday, 8 th June 2001 Finds best settings to optimize TWO quality characteristics Simultaneously 7. Taguchi Method Friday, 1 st June 2001 When to select a ‘Larger’ OA to perform “Factorial Experiments” Tips 6, 5, 4

More Tips 6. Taguchi Method Links below Friday, 25 th May 2001 Using Orthogonal Arrays for Generating Balanced Combinations of No. Is. E Factors 5. Taguchi Method Friday, 18 th May 2001 Signal-to-Noise Ratio for Quality Characteristics approaching IDEAL value 4. Taguchi Method Friday, 11 th May 2001 improves " quality “ at all the life stages at the design stage itself Tips 3, 2, 1

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

end