4.6 Robust Design

The loss function

loss varies with the square of the deviation of the quality characteristics from the target value L(Y) = k(Y-M)^2

Taguchi methodology based on precept that...

lowest cost to society represents product with highest quality which is achieved by reducing variation in product characteristics

Robust design creates

performance characteristics that are insensitive to variations in the manufacturing process

Taguchi tolerance design

performance characteristics that are insensitive to variations in the manufacturing process design of product/process that results in functionally acceptable products with economic tolerances improves product quality by reducing the effects of variability

Robust is the design of a...

product or process that results in functionally acceptable products with economic tolerances

Robust design improves

product quality by reducing the effects of variability

Issues with Taguchi's method

quality loss function not related to any physical relationship between a critical parameter and any quality aspect difficult to determine l