الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
Production lines consists of working stations which wo~k The harmony will be maintained as long as operations time are kept constant~ Unfortunately, there is a of factors that affect operation time and hence affect the stations sYl1Chronization_~ In short, those factors will bring the production line to an imbalanced situation.
The object of this research is to find the economical way to rebalance the production lines, which are subjocted to variation in operations time, by re-allocating the loads among the different
working stations~ To mako it more preoise, the rebalancing is obtained by redistributing the working units, if it is possible, between the different stations. The problOtl is when and how such redistribution is carried out ?
according to predictable pattern. and probalistic factors which causeas: factors whicl1 cause continuous variation in operations time.
The sources of imbalance are grouped and alassified (chapter I) the operation time to vary around a certain average~ Wo shall be interested only in these factors which caUSe continuous variation in operations time~ The probalistic factors, shown in Qpp~~41x\lI1 were treated in previous resoarch work (10, 16 and 39).~ They can be compensated by adding a SUfficiently large rlaterial-in-process buffer which helps in de-eoupling the station. . AI) using the principle of optimality was carrieout From this very simple production line model, as a point of start, another simple model is treated in chapter (Ill). there, the case of three working stations of identical working units was treated. Several types (4 types) of imbalance may appear in this case. So, a lot of basic rebalancing strategies may be used The method of optimum allocation of each basic rebalancing strategy is described. Also, the optimwn mix of basic strategies is describe After these two steps had been taken, different complicated PLMs were treated in chapter (IV)~ These models approach the real production lines. In chapter (IV), the basic strategies to rebalan~
1. Production line of ”nu working stations in series, of identical working units,
2. Production line of unit working stations in series, of different working units,
3. Convergent production line, and
6. Divergent production line, Were discussed~ The procedure to be followed to rebalance any of these models was mentioned.
Chapters (11, Ill, and IV) treated the problem of a single production line, with different forms or patterns~ The method of