Question 4 (33.33*) Two workstations are laid out in series. Subassemblies are passed from Workstation 1 to Workstation 2 for completion. It is assumed that there is always a subassembly available prior to Workstationl and that there is a buffer between both workstations which can cater for any potential back-log. The times in minutes for processing subassemblies at each workstation are as follows: Workstation 1 (WKN1)=U (10, 18) - Uniform distribution, Min =10, Max=18 Workstation 2 (WKN2) = N (10,2) - Normal distribution, Mean =10, Standard Deviation=2 . Note: You should determine the first random number using a method of your choice from your lectures. Subsequent random numbers may be read from the tables provided. Note: You may use a single random number multiplied by 12 in place of 12 individual random numbers to minimise computation time when determining values from the normal distribution. The reliability of each workstation in terms of its ability to produce assemblies within specification is described by an exponential function with failure rates for individual workstations as follows: 21 WKN1 = 0.08 22 WKN2 = 0.06 . Carry out a manual simulation of the system of three workstations in series for up to 30 minutes or until 3 items have been produced whichever is the sooner. Assume the system is in steady state before starting, i.e. there is a subassembly available at each workstation. Ideally, the results of your manual simulation should include: The number of assemblies produced during the 30 hour production period The number of failures in the system during the 30 hour production period A presentation of the Event Calendar and its changing nature . Question 4 (33.33*) Two workstations are laid out in series. Subassemblies are passed from Workstation 1 to Workstation 2 for completion. It is assumed that there is always a subassembly available prior to Workstationl and that there is a buffer between both workstations which can cater for any potential back-log. The times in minutes for processing subassemblies at each workstation are as follows: Workstation 1 (WKN1)=U (10, 18) - Uniform distribution, Min =10, Max=18 Workstation 2 (WKN2) = N (10,2) - Normal distribution, Mean =10, Standard Deviation=2 . Note: You should determine the first random number using a method of your choice from your lectures. Subsequent random numbers may be read from the tables provided. Note: You may use a single random number multiplied by 12 in place of 12 individual random numbers to minimise computation time when determining values from the normal distribution. The reliability of each workstation in terms of its ability to produce assemblies within specification is described by an exponential function with failure rates for individual workstations as follows: 21 WKN1 = 0.08 22 WKN2 = 0.06 . Carry out a manual simulation of the system of three workstations in series for up to 30 minutes or until 3 items have been produced whichever is the sooner. Assume the system is in steady state before starting, i.e. there is a subassembly available at each workstation. Ideally, the results of your manual simulation should include: The number of assemblies produced during the 30 hour production period The number of failures in the system during the 30 hour production period A presentation of the Event Calendar and its changing nature
