Decision Optimization

Decision Optimization

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Issue to solve resource-constrained project schedule

  • 1.  Issue to solve resource-constrained project schedule

    Posted 03/08/21 02:19 AM
    Edited by System Admin 01/20/23 04:12 PM
    Dear community team,

    I have tried to solve an optimization problem related to the RCPSP. The formulation is based on Pritsker et al. (link). The model is shown in the following:
    When I solved the model, it cannot return any reasonable solution. The solver showed that the solution is optimal with the zero objective function. It would be considered the objective value is 21. What I have doubted is that, the definition of the planning horizon (index t). For example, the second constraint:
    forall(t in horizon, r in resurces)
  c2:
  sum(i in tasks, tt in horizon: tt >= maxl(0, (t)-p[i]+1) && (tt) <= t+1)
    d[i,r]*x[i,tt] <= cap[r];​
    I was wondering if, where I am doing wrong and how can I fix it?
    (for the whole model please, see the attached files).


    Best regards
    Abbas
    #DecisionOptimization


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