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Design Study doesn't update the design variable.

Hi everyone,
I have a simulation in which the system is driven by a torque and then a contact case is simulated. The torque is controlled with a PID controller. The torque is also monitored by a sensor. The sensor interrupts the simulation if a certain torque limit is exceeded during the contact case. Now I would like to do a design study where a friction coefficient is variable in the design. To do this, I set it up with the Design Evaluation Tool and select friction as the design variable. The simulation script is a script that activates the sensor only after the static friction of the system has been overcome.
 
DEACTIVATE/SENSOR, ID=1
SIMULATE/DYNAMIC, END=2, DTOUT=1E-3
ACTIVATE/SENSOR, ID=1
SIMULATE/DYNAMIC, END=80, DTOUT=1e-3
 
Now the design study starts and performs the various runs. However, it does not update the design variable. This means that the same thing is simulated in all runs. How can this problem be avoided?
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