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Modeling and Simulation of a Serial Production Line with Constant WorkIn-Process

This paper presents a model for an unreliable production line, which is operated according to demand with constant work-in-process (CONWIP). A simulation model is developed based on the discrete model and several case problems are analyzed using the model. The model is utilized to optimize storage space capacities at intermediate stages and the number of kanbans at the last stage, which is used to trigger the production at the first stage. Furthermore, effects of several line parameters on production rate are analyzed using design of experiments. Keywords—Production line simulator, Push-pull system, JIT system, Constant WIP, Machine failures.