III. Reliability in Design and Development
A. Reliability design techniques
7. Design of Experiments (Analyze)
Plan and conduct standard design of experiments (DOE) (e.g., full-factorial, fractional factorial, Latin square design). Implement robust-design approaches (e.g., Taguchi design, parametric design, DOE incorporating noise factors) to improve or optimize design.
Robust means the design will work over a large and sometimes unexpected range of stresses.
Additional References
Quick Quiz
1-38. Identify which of the following statements is not true about the Taguchi DOE approach.
(A) It includes the concept of loss function in factorial experiments.
(B) The loss function is assumed to be a step function relative to the specification limits.
(C) Losses are assumed to occur when a process fails to meet a target value.
(D) Losses are assumed to be due to variability within the process.
(B) The loss function is assumed to be a step function relative to the specification limits.
There are two tenets emphasis by Taguchi’s approach. 1. Reducing product variation reduces the loss to society. 2. A proper development strategy includes intentionally reducing variation.
The Taguchi design of experiments approach uses orthogonal arrays to optimize performance or minimize cost with equivalent performance. The concept of the loss function is the squared deviation of the objective characteristic form it’s target value, it is a continuous parabolic function and does not include the tolerances or specification limits.
All of the other statements are true about the Taguchi DOE approach.
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