Chapter 8 Random-Variant Generation - ut：8章随机变量生成- UT.pptVIP

* Dump-Truck Example [Manual Simulation] The distributions of loading time, weighing time and travel time are: * Dump-Truck Example [Manual Simulation] Purpose: to estimate the loader and scale utilizations (% of time busy.) The model has the following components: System State [ LQ(t), L(t), WQ(t), Q(t)], where LQ(t) = number of trucks in loader queue L(t) = number of trucks (0, 1, or 2) being loaded WQ(t) = number of trucks in weigh queue W(t) = number of trucks (0 or 1) being weighed Event notices: (ALQ, t, DTi), dump truck i arrives at loader queue (ALQ) at time t (EL, t, DTi), dump truck i ends loading (EL) at time t (EW, t, DTi), dump truck i ends weighing (EQ) at time t Entities: The six dump trucks (DT1, …, DT6) Lists: Loader queue, all trucks waiting to begin loading, ordered in FCFS basis. Weigh queue, all trucks waiting to be weighed, ordered on a FCFS basis. Activities: Loading time, weighing time, and travel time. Delay: Delay at loader queue, and delay at scale * Dump-Truck Example [Manual Simulation] When an end-loading (EL) event occurs, say for truck j at time t, other events are triggered: If the scale is idle [W(t) = 0], truck j begins weighing and an end-weighing event (EW) is scheduled on the FEL. Otherwise, truck j joins the weigh queue. If there is another truck waiting for a loader, it will be removed from the loader queue and begin loading by the scheduling of an end-loading event (EL) on the FEL. Both this logic for the occurrence of the end-loading event and the appropriate logic for the other two events should be incorporated into an event diagram. * Dump-Truck Example [Manual Simulation] Simulation Table: At time 0, 5 trucks at the loaders and 1 is at the scale The imminent event is an EL event with time 5, hence clock is advanced to time t=5 Truck 3 joins the weigh queue (because the scale is occupied.) Truck 4 begins to load, schedule an EL event for future time 10 * Dump-Truck Example [Manua