(Solved): Question 3 (a) What is the meaning of robust design? What parameter is used to measure robustness? ...
Question 3 (a) What is the meaning of robust design? What parameter is used to measure robustness? (4 Marks) (b) Write formulas that are used to calculate the loss for an individual part in "nominal-is-the best situation", "smaller-is-the best situation" and "larger-is-the best situation". For each situation one formula is required. (3 Marks) (c) A company wants to maximise the weld strength of motor protector terminals. When the weld strength is
0.002(N)/(m)m^(2)some welds break. The average replacement cost is
A_(0). Calculate the loss coefficient
kand set up the loss function. If the manufacturing cost due to scraping is
$2per unit, calculate the manufacturing tolerance. If the last digit of your student number is
0,1,2,3, or 4 , use
A_(0)=$200. If the last digit of your student number is
5,6,7,8, or 9 , use
A_(@)=$400. (6 marks) (d) Consider a heat treatment process for studying the effect of three factors on strength of the heat treated material. The three factors are oven temperature, time in oven and supplier of raw materials. A
2^(3)factorial design of experiment has been performed. The results are summarised in Table 3.1. Determine and show graphically one of the main effects and one of the interaction effects. Show one graph for main effect and one graph for interaction effect. Table 3.1. Results of
2^(3)factorial design of experiment. # is the last digit of your student number.
