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Rough-Cut Capacity Planning in SCM EIN 5346 Logistics Engineering (MSEM, Professional) Fall, 2013. Rough-Cut Capacity Planning in SCM Theories & Concepts. Material programs Supplier selection Cooperation. Plant location Production systems - Subcontractors.
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Rough-Cut Capacity Planning in SCM EIN 5346 Logistics Engineering(MSEM, Professional)Fall, 2013
Material programs • Supplier selection • Cooperation • Plant location • Production systems- Subcontractors • Physical distribution structure- Transportation strategy • Product program- Strategic sales planning Long term • - Personnel training • - Contracts • - Material Requirements Planning • - Master production Scheduling • - Capacity planning • - Distribution planning • - Mid-term sales planning Mid term • - Personnel scheduling-- Material ordering • - lot-sizing- operations scheduling- shop floor control - Warehouse replenishment- Transportation planning • - Mid-term sales planning Hierarchical Planning Framework (review) Short term EXECUTION Flow of goods Information Feedback
Requirements for Production Planning: • to meet the demand • to consider the resource capacities and the material availabilities • to improve utilisation of the resources • to lower the setup time • to minimize the stock, and • to minimize the work in process (WIP) • to improve stability of the plan Production Process (review)
The main goal in rough-cut capacity planning is to identify where overloading or under-loading of production capacity occurs and revise the MPS as required. • Overloading means that too much production of products has been planned in the facility and insufficient capacity exists to produce planned quantities of products required in MPS. • Under-loading means that not enough production of products has been planned to fully load the facility. Rough-cut Capacity Planning
Forecast Consumption Mode and Horizon (Backword consumption of 4 days and a forward consumption of 3 days)
Starting from a demand plan, SNP checks the resource capacities and delivers a medium/long-term plan for the estimated sales volumes. • The plan includes the quantities to be transported between locations (e.g., DC-customer, or plant-DC) and the quantities to be produced (and procured), taking available capacity into consideration. • SNP creates planned orders, purchase requisitions, and stock transfers that can be transferred directly to the connected OLTP systems. Transactional Data for Transferring
Capacity leveling supports the following resource categories: • Production resources • Transportation resources • Capacity levelling supports the following resource types: • Bucket resources • Single-mixed resources • Multi-mixed resources • Transportation resources Capacity Levelling
The planner can use the following methods to adjust the plan: • Backward scheduling of the capacity load to fulfill demand using high priorities without due date violations. This rescheduling does not create any orders in the production horizon. • Forward scheduling of the capacity load for lower priority demand and use of demand priorities to minimize due date violations • A combination of backward and forward scheduling of the capacity load. Capacity Levelling
The main settings in the capacity leveling profile are scheduling direction, prioritization, and method. • Scheduling Direction controls whether Forward, Backward or Combined scheduling is used. • Prioritization for the heuristic run defines how leveling determines the sequence of orders. The two possible choices for prioritization (to be sorted by ascending or descending order) are • by order size or • by product priority. • The three Method choices are • Heuristic, • Optimizer or • Badi (Business Aided-in). Capacity Levelling Profile
Heuristic-based capacity leveling compares, period by period, the capacity load on a resource with the requested load, either from the beginning or from the end of the planning horizon – depending on which scheduling direction is selected (forward or backward scheduling). • If the resource is found overloaded, the system first selects all the activities or orders that cause the overload in this period. It then sorts these orders according to the priority that is defined and shifts orders or partial orders, one by one into subsequent or previous periods until the required maximum resource utilization is reached. Heuristics-based Capacity Levelling
For forward scheduling, the system moves the orders so far that the first activity using the resource to be leveled only begins after the overloaded period. • For backward scheduling, the system moves the orders so far that the last activity using the resource to be leveled actually ends before the overloaded period. • The system takes the lot sizes and rounding values defined in the master data into account when moving the orders. Heuristics-based Capacity Levelling
SNP Heuristic as Location, Network, and Multi-Level Heuristic
Only orders that cause overloads are changed. • This proves advantageous when a lot of orders exist but only some of them overload the resource. • Prioritization is done by product or by product quantity. • Select “Capacity Leveling” from the menu to balance the required work loads. Heuristics-based Capacity Levelling
The benefits of Supply Network Planning with SAP SCM are as follows: • Cross-plant medium-term rough-cut planning • Cross-plant optimization of resource utilization • Simultaneous planning of procurement, production and distribution • Simultaneous material planning and finite capacity scheduling of production, storage, and transportation resources • Planning of critical components and bottleneck resources • Prioritization of demands and receipts • Collaborative supply planning over the Internet Benefits of SNP with SCM
Operation research refers to the application of quantitative methods and techniques to business problems in order to best utilize a company’s resources. • OR is used by many leading companies in recent years to optimize their limited resources in order to maximize their profits or minimize their costs. • Linear programming (LP) is one of the most important tools of operation research. Operation Research (OR)
Five common types of LP problems: • Product mixed • Ingredient mix • Transportation • Production plan • Assignment Linear Programming (LP)
Define the objective • Define the decision variables • Write the mathematical function for the objective (objective function) • Write a one- or two-word description of each constraints • Write the right-hand side (RHS) of each constraint, including the unit of measure. • Write<=, =, or >= for each equation • Write all the decision variables on the left-hand side of each constraints • Write the coefficient for each decision variable in each constraint. Steps in Formulating LP Problems
Supply S1 S2 . Sm Parameter Table for Transportation Problem
Any problems (whether involving transportation or not) fits the model for a transportation problem if it can be described completely in term of a parameter table like Table 8.5 and it satisfies both the requirements assumption and cost assumption. • The objective is to minimize the total cost of distributing the units. All the parameters of the model are included in this parameter table. Transportation Problem Model
