Decision Optimization

Expand all | Collapse all

Flexible Job Shop Sched

  • 1.  Flexible Job Shop Sched

    Posted Thu December 31, 2020 12:38 PM

    I want to develop a flexible job shop scheduling using OPL (not CP). 
    When I run the model, it doesn't work and shows many errors. Can you please help me find what am I doing wrong here? Please have a look in the model and any possible solutions would be a great help for me. Thank you!!!
    My problem given below:
    the problem which im trying to solve

    my model is attached as flexiblejobshop.mod
    Data file is flexiblejobshop.dat



    flexiblejobshop.dat   783 B 1 version
    flexiblejobshop.mod   2 KB 1 version

  • 2.  RE: Flexible Job Shop Sched

    Posted Sat January 16, 2021 05:43 PM
    CPLEX understands linear constraints and certain quadratic constraints (second order cones). You have cubic expressions in constraints 5 and 6, which OPL cannot extract into a CPLEX model because CPLEX does not have any provision for cubics. You need to linearize those constraints (and also the quadratic portion of constraint 7).

    Paul Rubin
    Professor Emeritus
    Michigan State University