Design for Reliability Paper

HW04 Design for Reliability

Due at the beginning of the coming Thursday class.

Name: ___________________

  1. (10 pts.) Review the concept and the applications of QFD (Quality, Function, and Deployment). Discuss which of the area(s) from the Deming’s system of the profound knowledge can be related to the QFD and how. (Note: After reviewing what your have reported in the previous assignment where the Deming’s system of the profound knowledge is asked, I found many of you reported answer based on a shallow understanding. Please confirm your idea/impression on each area by briefly reviewing the textbook, then answer the question.)

 

 

  1. (10 pts.) A specification for the length of an auto part at Adams Metal Fabricating is 15.0 ± 1.75 centimeters (cm). It costs $56 to scrap a part.
  • Determine the Taguchi loss function.

56 = k(1.75^2)  k = 18.2857

  • Then determine the expected loss if the process mean is found to be 15.03 cm with a variance of 0.49 cm2.

 

EL = 18.2857 * (0.49 + 0.03^2) = 8.9764

 

  • Determine the expected loss when the process variance is reduced to 0.16 cm2. The process mean remains unchanged.

EL’ = 18.2857 * (0.16 + 0.03^2) = 2.9422

 

  • The firm makes 10,000 auto part a year and it needs a onetime cost of $ 200,000 to reduce the variance from 0.49 to 0.16. Considering the production volume, is it worthwhile to pursue the improvement? Please make a common sense based decision by comparing the benefit and the cost of the improvement. Show the steps or rationales.

 

 

 

 

 

 

  1. For this problem, please refer to the attached Excel spreadsheet. Please complete the assignment within the Excel but report the result back in the space below.
Problem Answers
#1  
#2  
#3 –System to Choose  
#3 – Component X reliability  

 

 

 

 

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