Heuristic for Critical Machine Based a Lot Streaming for Two-Stage Hybrid Production Environment

. Lot streaming in Hybrid flowshop [HFS] is encountered in many real world
problems. This paper deals with a heuristic approach for Lot streaming based on critical
machine consideration for a two stage Hybrid Flowshop. The first stage has two identical
parallel machines and the second stage has only one machine. In the second stage machine is
considered as a critical by valid reasons these kind of problems is known as NP hard. A
mathematical model developed for the selected problem. The simulation modelling and
analysis were carried out in Extend V6 software. The heuristic developed for obtaining optimal lot streaming schedule. The eleven cases of lot streaming were considered. The proposed heuristic was verified and validated by real time simulation experiments. All possible lot streaming strategies and possible sequence under each lot streaming strategy were simulated and examined. The heuristic consistently yielded optimal schedule consistently in all eleven cases. The identification procedure for select best lot streaming strategy was suggested.