Materials requirements planning, Mechanical Engineering

Materials requirements planning:

Materials requirements planning (MRP) is a set of process for converting forecasted demand for a manufactured product into a requirement schedule for the components, subassemblies, & raw materials comprising that product. A closely associated concept is that of the master production schedule (MPS), which is a specification of the projected needs of the end product by time period. The explosion calculus represents the set of rules and procedures for converting the MPS into the requirements at lower levels. The information needed to do the explosion calculus is contained in the product structure diagram and the indented bill-of-materials list. The two key pieces of information contained in the product structure diagram are the production lead times needed to produce the specific component, and the multiplier giving the number of units of the component required to generates one item at the next higher level of the product structure.

Most of MRP systems are depend on a lot-for-lot production schedule. The number of units of a component produced in a period is the same as the requirements for that component in that period. However, if setup and holding costs may be estimated accurately, it is possible to find other lot-sizing rules that are more economical. We have also treated the dynamic lot-sizing problem when capacity constraints exist. One of the restrictions of MRP is that capacities are ignored. This is especially important if lot sizing is incorporated into the system. Determining optimal solutions to a capacity-constrained inventory system subject to time-varying demand is very difficult problem. System nervousness is one difficulty that arises whereas implementing the MRP system, the term refers to the unanticipated changes in a schedule that result when the planning horizon is rolled forward by one period. Another problem is that in many circumstances, production lead times based on the lot sizes; MRP assumes that production lead times are fixed; still another problem is that the yields at various levels of the process cannot be perfect. If the yield rates can be accurately estimated in advance, these rates may be factored into the calculations in a straightforward manner. However, in many industries the yield rates may be difficult to estimate in advance. Generally MRP II is implemented to overcome some difficulties involved in implication procedure of MRP. It integrates financial, accounting and marketing functions of the production planning system.

Posted Date: 2/1/2013 1:11:34 AM | Location : United States







Related Discussions:- Materials requirements planning, Assignment Help, Ask Question on Materials requirements planning, Get Answer, Expert's Help, Materials requirements planning Discussions

Write discussion on Materials requirements planning
Your posts are moderated
Related Questions
The Continue Dimension Command You can use the Continue command to add a string of dimensions. In the illustration above the "36mm" dimension has been continued from the "64mm"

Effect of Individual Alloying Elements: Sulfur Sulfur is not a needed element in steel since in interferes along with hot rolling and forging resulting in hot-shortness

Explain the Advantages of Automation 1. There is an increase in productivity. 2. The unit cost is reduced as larger number of components can be manufactured in shorter time

Third Service and Fourth Service Prepare a list and explain the mandatory checks to be carried out during third and fourth service of a motorcycle.

what is internal combustion engine

One of the simplest devices that have both vertical and horizontal motion is a slide or chute. It may be straight or spiral and is static in nature. Gravity is utilized in

What is Metal Cutting Tool? A cutting tool (or cutter) is any tool which is used to remove material from the work piece by means of shear deformation. Cutting may be completed

Explain Wilson HArtnell Governor

What is Time-Study ? How the standard time is determined in Time-Study ? What are the Merit-Rating ? Illustrate various methods of Merit-Rating. Describe the Break-Even-Analy

Edge joints: The flanged edge joint is suit- able for plate 1/4 inch or less in thickness and can only sustain light loads. Edge preparation for this joint may be done.