A hybrid GA - SA algorithm for Just-in-Time scheduling of multi-level assemblies

Anthony Roach, Rakesh Nagi

Research output: Contribution to journalArticlepeer-review


The environment is a manufacturing facility that produces multi-level assemblies in a Just-In-Time (JIT) fashion. The due-dates and lot-sizes of the end-items are given, and the objective is to determine a lot-for-lot operations schedule that minimizes the cumulative production lead-time. The scheduling problem within such an environment is NP-hard, and therefore, the performance of heuristics may vary depending on the specific problem instance. To address this problem an effective hybrid Genetic Algorithm - Simulated Annealing (GA - SA) algorithm is developed. The GA starts with an initial population generated by well known scheduling heuristics, a critical path heuristic, and randomly generated schedules. The scheduling work is shared by the GA and SA in two phases that alternate until convergence: (1) Phase I is the GA that crosses over solutions for different work-centers, and (2) Phase II is the SA that improves the sequence of operations on individual work-centers. The effectiveness of the proposed heuristic is assessed via numerical studies.

Original languageEnglish (US)
Pages (from-to)1047-1060
Number of pages14
JournalComputers and Industrial Engineering
Issue number4
StatePublished - Sep 1996
Externally publishedYes

ASJC Scopus subject areas

  • Computer Science(all)
  • Engineering(all)


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