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
Question: A 4- pole DC motor is operated as a separately excited motor.  When the motor is externally driven at 1800 rpm with rated field current and zero armature current,

Q. What is Blow molding ? Blow molding has been used for making plastic bottles, toys, doll bodies and many other items. The blow molding commences with the extrusion of the t

Compute amplitude and frequency of the particle: The displacement of a particle is described by x = 5 + 3 cos 3 t. Determine the position of the particle at t = 3 seconds. Com

Part Contact States The loading, movement and unloading of parts via the manufacturing system should be scheduled through supervisory computer. In contrast along with classical

What do you mean by centrifugal casting ? How are the centrifugal method classified ?

Determine the Elements of the VDAFS version 2.0 Elements of the VDAFS version 2.0 are shown in Table. Curves and surfaces are described with the help of points, set of points

Explain concept of Counter Bore and countersink in radial drilling machine Counter Bore :- This operation uses a pilot to guide the cutting action to accommodate the heads

Choose either a plastic, composite, titanium alloy or aluminium alloy for the applications below and briefly explain your choice. In explaining your choice, relate the properties t

2. Assume that the river has been selected as the source of raw water for the 2.0mgd demand. a. Surface water has low alkalinity, high turbidity. The distribution system is cast

Branches of mechanics: Mechanics is basically divided in to two parts Static's and Dynamics, Dynamics is further divided in kinematics and kinetics Statics: It deals with