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我是初学者，想用Arena做以下的题目
Develop a model of a cross-dock system that groups and transfers material for further shipment. This facility has five incoming docks and three outgoing docks. Trucks arrive to each of the incoming docks with loads of material on pallets. The inter-arrival time is UNIF(30, 60) between truck arrivals on each incoming dock (all times are in minutes). Each truck will have a number of pallets drawn from a UNIF(10, 22) distribution that need to be transferred to one of the outgoing docks. Assume an equal probability of any incoming pallet going to any of the three outgoing docks. When trucks arrive, an automatic unloading device unloads the pallets at the incoming dock. Assume that this requires no time, so the pallets are immediately ready for transfer. The pallets are transferred by one of 5 fork trucks to the outgoing docks, which are located on the other side of the building. The distance between any incoming dock and any outgoing dock is 75 feet, and the fork trucks travel at 75 feet per minute. The time for a fork truck to load a pallet is UNIF(0.3, 0.4) and to unload a pallet is UNIF(0.2, 0.4). The performance measure of interest is the average time a pallet spends in the system. (Hint: If you place all fork trucks at the outgoing docks for their initial position, you don't have to add distances between the incoming docks.) Set the run length to be 720 minutes and regard this as a terminating simulation. Develop a model for each of the following two cases, and animate your models: |
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发表于 2009-8-6 09:39:58
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