:Study on Buffer Storage in Production Line Systems (5th Report)

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This paper has investigated the effects of the shape of the repair time distribution on the produc-tion rate improvement by the provision of buffers in the production line, and examined the propriety of geometric or exponential repair time distributions. The following results have been obtained : (1) The shape of the repair time distribution has no effect as to the degree to which a production line can be improved by the provision of buffers. Only the coefficient of variation is the deciding factor. (2) When marked buffer installation effects are gained, the coefficient of variation influences the production rate increment significantly. (3) The ratio of the production rate increment for the co-efficient of variation 0. 0 to the one for 1.0 lies between 1. 0 and 1.4. (4) The buffer model on which repair time is approximated by a geometric or ex-ponential distribution, is a useful tool for gaining insight into the qualitative trend of the buffer in-stallation effects, but when the production rate can be improved markedly by the provision of buffers, it requires quantitative correction of the production rate increment, associated with the value of the coefficient of variation.
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