b) WTS Ltd is a small-scale wind turbine shafts manufacturer, operates in 2 rotating shifts per day, i.e. 8 hours per sh

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B Wts Ltd Is A Small Scale Wind Turbine Shafts Manufacturer Operates In 2 Rotating Shifts Per Day I E 8 Hours Per Sh 1 (137.48 KiB) Viewed 31 times

b) WTS Ltd is a small-scale wind turbine shafts manufacturer, operates in 2 rotating shifts per day, i.e. 8 hours per shift. To determine a specification for the wind turbine shafts, the company must determine both a functional tolerance and customer loss. The customer loss, Ao, is the average loss occurring during the manufacturing of the shafts. The company's manufacturing target is 100 shafts per shift. The average cost to the consumer is £100 per shaft due to defect. The functional tolerance, To is set with an acceptable level of 2 shafts. Given that: L=k* (y – m)?; k= (Aol (To)2); L = Loss function y = reported value; m = mean value (average) (0) What is the loss imparted to society per manufacturing shift with 85shafts? (3 marks) (ii) The manufacturing tolerance is the economic break-even point for reworking scrap. Suppose the off-target wind turbine shaft can be adjusted at the end of the line for £25. At what tolerance (acceptable) level, should the manufacturer spend the £25 to adjust the shaft? Hint: The manufacturing tolerance is determined by setting L = £25. (5 marks) c) The bathtub curve is widely used in reliability engineering. It describes a particular form of the hazard function which comprises three parts. (i) Illustrate a diagram to represent the Bathtub curve. (ii) What is the purpose of the Bathtub? (5 marks) (Total Marks 25)