A Tactical Planning Model for a Job Shop

We develop an analytic and a simulation model for a job shop with unreliable work stations and production constraints. In the complex batch manufacturing operation of the factory, smooth production of each work station is required. In the previous work the Tactical Planning Model was proposed for this purpose. In that model, the production of each work station should be proportional to the queueing level of the input work flow. In this paper, the model is extended to the work station with production constraints and with given unreliability of its operation, because in the real world situation, the work stations cannot be operated perfectly without any trouble nor infinite productivity. For the analysis of multiple unreliable work stations, we develop an analytical model and solution. The break down of the work station is modeled as a Bernoulli process. For the analysis with the production constraints with or without the unreliable work station model, we develop a dynamic simulation model. We show some examples of this problem, and show the effect of production constraints and unreliable work stations. Thesis Supervisor: Dr. Stephen C. Graves Title: Professor of Management Science The contents of the thesis Chapter