Topics started by stefan1991
Hello, At the moment I am performing a scheduling problem with time windows. The model is very similar to the second model which can be downloaded from the AIMMS website (see link) execpt from a number of elements: I try to minimize the sum of all the changeovers that are used. Base unit is in minutes. In total I have 3 datasets (one for each machine) that AIMMS can read in from an Excelfile, one at a time. Initially, my model is able to solve using CPOptimizer 12.8 for all machines, where each job has to be scheduled after the "StartTime" and finish before an "Endtime". After this solution I would like to decrease the StartTime by one week when a job meets a certain criteria and then solve it again. When I run the procedure that decreases the Startime by one week and try to solve it again it finds a solution for only one of the machines and for the other two AIMMS hasnt been able to find a solution yet after more than 9 hours. For the machine that could find a so
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