Planning and scheduling of multiple flexible-shops based on analytical target cascading and particle swarm optimization

Because the traditional scheduling model of single job-shop can not meet the requirements of distributed scheduling systems of multiple job-shops,a planning and scheduling model of multiple job-shops based on analytical target cascading and particle swarm optimization was established,where the planning layer was responsible for distributing jobs to each workshop,and the workshop scheduling layer was responsible for planning job operations in each workshop.Take a two job-shop system as an illustrated example to verify the proposed model.The results show that distributed scheduling problems of multiple flexible-shops can be solved effectively,and jobs can be distributed to the workshops rationally,and meanwhile job schedule in each workshop is realized.