Details

CONCURRENT LINEAR OPTIMIZATION MODEL FOR DESIGN AND MANUFACTURING TOLERANCES WITH PROCESS AND MACHINE SELECTION INCORPORATING SCRAP RATES AND MACHINE BREAKDOWN

by CHANDRA, SHANTANU

Abstract (Summary)
Tolerance is a key design tool. The allocation of correct tolerances is very important as it directly affects the cost, functionality and quality of the product. In the scope of process planning, there has been some work done which deals with optimization of the design and manufacturing tolerances with process (and machine) selection. They formulate the problem as a non-linear cost optimization model and use intelligent search techniques like genetic algorithm to solve it. The current work formulates the model for the concurrent optimization of the design and machining tolerances while considering shop floor parameters like machine loading, machine breakdown and scrap rates of processes into account. Piecewise-linear curves for cost-tolerance and time- tolerance have been used in formulating the problem as a Mixed Integer Program. Stochastic shop floor parameters like machine breakdown and scrap rates of processes have been included in the model. These enhancements can be viewed as a distinct positive step towards integration of the process planning and scheduling functions on the shop floor. The linear optimization model has been solved using branch and bound method. Moreover, the use of the standard branch and bound algorithm allows for analyzing the structure of the problem through sensitivity study.
Bibliographical Information:

Advisor:

School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:concurrent optimization of tolerances linear process planning with machine selection breakdown scrape rates processes

ISBN:

Date of Publication:01/01/2002

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