Capacity Requirements Planning (CRP)
In the previous sections of this chapter that focused on the MPS and running the MRP program. we mentioned that production capacity is usually some finite amount and obviously has limits. We also cited the interaction between the scheduler and rerunning the MRP program to obtain feasible schedule in light of thi limited capacity. In this ection we explicitly point out how capacity i~ computed amamwhat the usual procedure is for addressing capacity constraints.
Computing Work Center Load
Each work center is generally a functionally defined center where jobs routed to it require0 the same type of work, on the same type of equipment. From the work center view. if there is adequate capacity. the problem is one of priorities: job to do first. If there is insufficient capacity. however. the problem mu. t be resolved b: the ch dealer, Exhibit 17.15 shows a work center that to it. , .otc that the capacity per week was computed at the bottom of the exhibit at 161.5 hours. The jobs scheduled for the three weeks re ult in two I and one week requiring overcapacity.Exhibit 17.15 uses the terms utilization AM efficiency, Both or thee terms have been defined and used in a variety or ways. some conflicting. In the-, exhibit. utilization refers to he actual time that the machines are used. Efficiency refer, to how well the machine is performing while it is being used. Efficiency is usually defined at compare-on of actual performance to a defined standard output or all engineering design rate. For in time.