Assignment Task:
Task:
1. Practical questions: Operations modelling (40 Marks)
In a wax manufacturing, WAXs arrives every 1hr in lot sizes of 4 to a buffer. Each wax is sent to assembly machine named OVEN where it is combined with Mould into one part. The oven needs 5 mins for set up which requires an operator. Then the oven runs another 15mins to combine the wax to the mould. Once the combined part is done, it is sent to a cooling for at least 40 mins. Eventually, the combined part needs to be split from the mould in a split machine for 5 mins after the cooling. Once the wax is split, it is a finished product and is ready-to-ship.
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Get Help Now!a) Regarding above description, map out the overall WAX manufacturing processes with a process mapping tool of your choice. (10 marks).
b) Considering a configuration of two ovens, one operator, 3 moulds, one cooling and one split machine, use a Gantt Chart to identify the bottleneck of the total outputs of above operation. You may need some explanations and calculations to back up your arguments. (10 marks).
c) Use witness to simulate the described process and to quantify one key operations performance from the process. Propose a solution to double its performance based on the settings of Question(b). Details of your analysis need to be explained. (20 Marks).
2. Practical questions: System Dynamics (30 Marks)
The COVID-19 pandemic has a massive negative impact on human wellbeing and the global economy since its outbreak at the end of 2019. Early studies have shown that using Personal Protective Equipment (PPE) helps for protection against the spread of the disease. Therefore, retailers have put an enormous effort on the stable, reliable, and rapid management of PPE supply chain. During the pandemic, the procurement and inventory management for PPE has gained immense attention. Retailers believe that system dynamics might help them plan procurement, inventory and sales planning for PPE. It is very well known that if there is no PPE inventory, there can be no sales. In other words, PPEs are sold from inventory. It is also known that if there is no PPE procurement, there is no PPE inventory. Each PPE item first goes into inventory once they arrive. If the PPE sales increase, retailers purchase more PPE.
To be on the relatively safe side, retailers have a target inventory which is equal to coverage level (c months) times PPE sales (i.e. target inventory is c months of sales). There is a time to replenish PPE inventory and it is called lead time.
a) Draw the Causal-loop diagram, put the sign (positive or negative) for the whole model, discuss the model and write equations for variables. (10 Marks).
b) A retailer has a coverage level of 4 months and the lead time of PPE is 2 months. Assume that the retailer has an initial inventory level of 100000 PPE and the demand of PPE has a step-wise function. Demand is 20000 units between 0-25 months, demand is 45000 between 25-75 months, and finally demand is 60000 units between 75-100 months. (15 Marks).
– Establish complete model on Vensim and report model as screenshot in the report. Run this model on Vensim for 100 months with time step of 0.25.
– Discuss results for inventory level, procurement level and show graphs of results.
– Make recommendations to the retailer.
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