Decision Optimization

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Flexible Job Shop Sched

  • 1.  Flexible Job Shop Sched

    Posted Thu December 31, 2020 12:38 PM
    Hi,

    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

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    nurcan.a
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    Attachment(s)

    dat
    flexiblejobshop.dat   783 B 1 version
    mod
    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).


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    Paul Rubin
    Professor Emeritus
    Michigan State University
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