The calculation of MPS 5.Calculate the Planned Order Receipts,PORC Suppose that the Planned Order Receipts of product i in period t is PORC (t). If there is net demand in period t,it is required that the number of materials is at least the number of net demand,and the output time is the same with that of net demand. PORC should consider the economic lot size,therefore,PORC is the multiple times of lot size
The calculation of MPS 5. Calculate the Planned Order Receipts, PORC Suppose that the Planned Order Receipts of product i in period t is PORCi(t). If there is net demand in period t, it is required that the number of materials is at least the number of net demand, and the output time is the same with that of net demand. PORC should consider the economic lot size, therefore, PORC is the multiple times of lot size
The calculation of MPS 6.Calculate the Planned Order Release,POR Suppose that the Planned Order Release of product i in period t is POR(t).POR(t)=PORC(t-LT)where LT is the lead time. 7.Calculate the Projected Available Balance,PAB Suppose that the projected available balance of product i in period t is PAB (t) PABi(t)=PABi(t-1)+SRi(t)+PORCi(t)-GRi(t) POHi(t)+PORCi(t)
The calculation of MPS 6. Calculate the Planned Order Release, POR Suppose that the Planned Order Release of product i in period t is PORi(t). PORi(t)= PORCi(t-LT) where LT is the lead time. 7. Calculate the Projected Available Balance, PAB Suppose that the projected available balance of product i in period t is PABi(t) ݐ ܴܩ െ ݐ ܥܴܱܲ ݐ ܴܵ 1 െ ݐ ܤܣܲ ൌ ݐ ܤܣܲ ݐ ܪܱܲ ൌ ݐ ܥܴܱܲ+
The calculation of MPS 8.Calculate the Available to Promise,ATP ATP is the excess product before the next output,which is the number of output minus the total demand during the period from now to the period of next output. Suppose that the Available to Promise of product i in period t is ATP(t) ATPi(t)=PORCi(t)+SRi(t)-GRi(j) Where t'is the period of next output
The calculation of MPS 8. Calculate the Available to Promise, ATP ATP is the excess product before the next output, which is the number of output minus the total demand during the period from now to the period of next output. Suppose that the Available to Promise of product i in period t is ATPi(t). െ ݐ ܴܵ ݐ ܥܴܱܲ ൌ ݐ ܲܶܣ ∑ ܩ ܴ௧`ିଵ ୀ௧ ݆ Where t’ is the period of next output
MRP-Overview MRP create schedules identifying the specific parts and materials required to produce end items planned by MPS; The exact numbers needed;and The date when orders for these materials should be released and be received or completed within the production cycle
MRP-Overview MRP create schedules identifying • the specific parts and materials required to produce end items planned by MPS; • The exact numbers needed; and • The date when orders for these materials should be released and be received or completed within the production cycle
MRP-the Explosion Calculus .Translates MRP for the end product into a production schedule for the components at the next level of the product structure. Determine the gross requirement with the BOM and the parts of upper level; Net requirement=Gross requirement-on hand inventory-scheduled receipts Net requirement is shifted by LT=Time-phased requirement; Time-phased requirement is treated by lot-sizing algorithm= planned order release 上游充道大睾
MRP-the Explosion Calculus •Translates MRP for the end product into a production schedule for the components at the next level of the product structure. Determine the gross requirement with the BOM and the parts of upper level; Net requirement=Gross requirement-on hand inventory-scheduled receipts ; Net requirement is shifted by LT= Time-phased requirement; Time-phased requirement is treated by lot-sizing algorithm = planned order release