MRP Explosion Calculus CRP
Inventory record files
checking if sufficient capacity is
available. If not, the schedule
OK Yes Production order
2014-3-8
No
should be modified.
MPS
Inventory Management
MRP Explosion Calculus CRP
Bill of Materials (BOM)
pProduction costing ; pShop floor management; pInventory pAccounting;
MPS
Bill of Mterials (BOM)
MRP Explosion Calculus
Inventory record files
Production order
Purchase order
2014-3-8
Closed-Loop MRP
Aggregate product plan
Firm orders from known customer Forecast of demand from unknown customer
Demand Forecast
Aggregate Planning
cut capacity planning and
capacity requirement planning; p-Short-range: Finite loading and Input/output analysis
2014-3-8
-术语 -排列 -时序理论 -许多的；倍数；并联 -高级话题，高级主题 -装配线平衡 -作业排程，生产经营进度表 -现场作业排程
-利用 -同时地 -生产量，生产能力，吞吐量 -生产率，吞吐率
3
-Reentrant system -Reentrant [riː'entrənt] -all-purpose solution -evaluation criteria [kraɪ'tɪərɪə] -downstream operations -Parallel processing -sequential processing -identical [aɪ'dentɪk(ə)l] -elapse [ɪ'læps] -tardiness ['tɑːdɪnɪs] -Cartesian coordinate -Cartesian [kɑrˈt ɪʒən] -coordinate [kəʊ'ɔ:dɪneɪt]
MPS
pWhen MRP system has information feedback from its module output, this is termed closed loop MRP; pThe closed-loop is realized by
Bill of Mterials (BOM)
Operations Scheduling (Shop floor Scheduling & Control)
Finite loading
Input/outp ut analysis
Aggregate product plan
Firm orders from known customer
Forecast of demand from unknown customer
♂可重入系统 ♂再进入的，凹角的 ♂通用解决方案 ♂评估标准 ♂下道工序，下游业务 ♂并行 加工 ♂顺序加工 ♂完全相同的 ♂消逝，时间过去 ♂迟延，缓慢 ♂笛卡尔坐标系 ♂笛卡儿的 ♂坐标；整合；同等的
4
-FCFS (first come-first served) -SPT (shortest processing time) -EDD (earliest due date) -CR (Critical ratio)
5
-Reentrant system -Reentrant [riː'entrənt] -all-purpose solution -evaluation criteria [kraɪ'tɪərɪə] -downstream operations -Parallel processing -sequential processing -identical [aɪ'dentɪk(ə)l] -elapse [ɪ'læps] -tardiness ['tɑːdɪnɪs] -Cartesian coordinate -Cartesian [kɑrˈt ɪʒən] -coordinate [kəʊ'ɔ:dɪneɪt]
11



^^长期计划（1年以上）： 1.过程设计Process Planning：确定特定产品的生产技术和流程； 2.战略能力计划Strategic capacity planning：确定长期能力，如规模 和范围等； ^^中期计划（6-18个月，常以月或季度划分） 3.总体规划AP：确定生产率，确定产品族的净需求，进而确定每月员
Production Planning
Aggregate Planning(AP) = macro planning
-总计划、总体规划
Master Production Scheduling (MPS)
-主生产计划
Material Requirement Planning (MRP) -物料需求计划 Capacity Planning -产能计划、能力计划 planning horizon -计划期、计划周期 Capacity requirement planning (CRP) -产能需求计划 hierarchical production planning (HPP) -分层生产计划 hierarchical [haɪə'rɑːkɪk(ə)l] -adj. 分层的；等级体系的
2014-3-8
Forecast of future demand Aggregate plan Master production schedule (MPS) Schedule of production quantities by products and time period Material Requirement Planning (MRP) Generate Production orders and purchase order Operations Scheduling To meet quantities and time requirements for MRP
Implement the production orders generated in MRP under given objectives ; Allocate production resources (machine, workers et al.) to production orders (jobs or tasks and their due dates) in an optimized manners; The results are time allocations of production resources to different jobs (job sequences on each production resources); All the orders can be completed while all production resources are utilized with their loads being balanced.
♂可重入系统 ♂再进入的，凹角的 ♂通用解决方案 ♂评估标准 ♂下道工序，下游业务 ♂并行 加工 ♂顺序加工 ♂完全相同的 ♂消逝，时间过去 ♂迟延，缓慢 ♂笛卡尔坐标系 ♂笛卡儿的 ♂坐标；整合；同等的
6
Capacity Planning -Framework
Process Planning
p-Long range: Strategic capacity planning; p-Medium range: RoughLong Range Strategic capacity Planning
-dispatch -review -expedite -batch -distribution -time interval -increase -flow shop -job shop -turning center -drilling center -milling center -grinding center
=工作i的 剩余时间/加工时间
工作i的剩余时间=交货期-现在时间
-先到先服务，先进先出 -处理时间最短 -交货期最短 -紧迫系数（最小），临界值
-enumerate [ɪ'njuːməreɪt] -枚举，列举 -enumerating -穷举法，列举法 -feasible ['fiːzəb(ə)l] -可行的 -moderate-size -中等规模的，中型的 -Gantt chart [gænt] -甘特图 -permutation [pɜːmjʊ'teɪʃ(ə)n] -[数]排列 -Cartesian [kɑrˈt ɪʒən] -笛卡儿的；笛卡尔坐标系
Purchase Management OK Account and Financial Management Yes Production order Purchase order No
（财务-成本管理）
2014-3-8
Shop Floor Management
Introduction-What is Operations Scheduling ?