Design and analysis of just-in-time production systems
Author
Oğuz, Ceyda
Advisor
Dinçer, Cemal
Date
1988Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
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Abstract
Just-in-Time (JIT) production systems have initially appeared in the
Japanese manufacturing environment due to the scarcity of their critical resources.
The main aim in JIT production systems is to eliminate waste. To
achieve this objective, setup times, lead times, in-process inventories, and
defective production must all be minimized. In the design process of a JIT
production system, several factors such as lot size, number of kanbans, unit
load size, and buffer capacities must be taken into account. In this study, a
mathematical model is developed for a single-item, single-line, multi-stage,
and multi-period JIT production system. The original model is nonlinear in
both objective function and constraints. To reduce the computational difficulties,
the nonlinear model is then approximated by a linear model. Next,
a simulation model is developed to incorporate the stochastic nature of the
demand. A sensitivity analysis is performed on unit load size and on buffer
capacity under different demand patterns to examine their effects on the
behavior of the model. The results show that thofee unit load size values
exceeding 10 percent of the maximum demand in the planning horizon have
no effect on the model.