Pragmatic aspects of the solution of FMS scheduling problems using hybrid dynamical approach
Hybrid Dynamical (or Switched Server) approach is a relatively new direction in the solution of FMS scheduling problems. The theoretical results in this field are promising, but a number of questions should be cleared for practical applications. Some of these are: How to choose demand rates? How to provide the stability of processes in multi-machine group cases? What are the main characteristics of the processes and how to determine the suitable values of the parameters? In relation to the first two questions, proposals are given in the present paper. For demand rates determination, relations giving the upper and lower boundary values are proposed. For multi-machine group processing, the controlled buffer technique was developed. In relation to the others, simulation studies are proposed. Two of the simulation approaches are described in this paper and some demonstration is also given. The simulation results obtained from case studies show that the overlapping production obtained using the hybrid dynamical approach (HDA) are far more effective than batch processing. The decrease of production times may reach 2030% or more.
fms scheduling switched server demand rate controlled buffer technique overlapping production hybrid dynamical approach (hda) manufacturing simulation dynamical division of series