Regarding BSK_sim's inability to configure runtime and perform simulation

[wanglishuo]

@schaubh Hi , professor!
I am currently working on a project using BSK_sim to remove reaction wheel momentum using a thruster,I use three connected modules to dump momentum,as shown in this plan.
https://hanspeterschaub.info/basilisk/examples/scenarioMomentumDumping.html#scenariomomentumdumping
I have a question. Module: ThrMomentumManagement cannot run at the beginning and needs to be restarted after ten seconds. In the original plan, the method ThrDesatControl.Reset can be used to restart it. But how should I use it in BSK_sim? Module: ThrMomentumManagement is in the FSW module, but it seems that I cannot call it when configuring runtime. May I ask if there are any examples in this area for my reference? How can I solve it?
Thank you very much for your answer!

[schaubh]

You can run the simulation for 10s, restart it, then continue. Or, you can look at the event handler system to setup an event to trigger this reset after 10s. You see the event handler system uses in bskSim to change flight modes. The event handling system is not extensively documents, you might have to follow the code.

[wanglishuo]

I made the modifications according to the method you provided. I created a new event and triggered it during program execution. But it doesn't seem to work. Can you help me check where the problem is?

[schaubh]

This scenario talks more about using the event system and might be helpful.
http://hanspeterschaub.info/basilisk/examples/BskSim/scenarios/scenario_AddRWFault.html

[wanglishuo]

I'm sorry professor,
I tried the method in this example, but it still doesn't work, and the momentum of the reaction wheel still doesn't show any change. I have been thinking for many days and trying various methods, but they still don't work. I have tried to create such an event in the "BSK-Fsw" section, and this is the code.
SimBase.createNewEvent("initiateOneTimethrDesatControl", self.processTasksTimeStep, True, ["self.OneTimethrDesatControlFlag==1"], ["self.FSWModels.OneTimethrDesatControl"])
Among them, I set ". OneTimethrDesatControl" as follows.
def OneTimethrDesatControl(self): self.thrDesatControl.Reset(mc.sec2nano(10.0))
I have also tried restarting these three connected modules directly after 10 seconds, and the following is the code.
SimBase.createNewEvent("initiateOneTimethrDesatControl", self.processTasksTimeStep, True, ["self.TotalSim.CurrentNanos>=self.OneTimethrDesatControlTime and self.OneTimethrDesatControlFlag==1"], ["self.enableTask('RWDesatTask')" ])
Among them, I set the RWDesatTask as follows.
SimBase.AddModelToTask("RWDesatTask", self.thrDesatControl, 10) SimBase.AddModelToTask("RWDesatTask", self.thrForceMappingObj, 9) SimBase.AddModelToTask("RWDesatTask", self.thrDump, 8)
I have tried many similar methods, but none of them have worked. I would like to ask where the problem is? Is it really possible to use event handler systems? Is it possible that the event handler system cannot be set in "BSK-Fsw" and can only be set in "BSK-Dynamics"?
Do you have any examples of using BSK_Sim to solve the removal of reaction wheel momentum? I really need it.Thank you for your help

[schaubh]

Howdy @wanglishuo , I don't be able to help you debug your specific scenario. I'm assuming you were able to run the tutorial scenario? You can debug yours buy building off the sample script. Also, you have access to all the source code, so you can trace the code execution to see where something is not happening as you expect.

General comments, the event handler executes some python script that you provide. Makes sure that this code can execute from the location it is being called. Also, once an event is called it it turned off by default to avoid having it being called repeatably. You can play with the setEventActivity flag to turn off and on this behavior. The sample script documentation talks about having repeated and one-time events.