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[Question #704311]: How can I control the variables in the Partial engine during the simulation?

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: JINSUN LEE <question704311@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 06 Jan 2023 16:30:36 -0000
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New question #704311 on Yade:
https://answers.launchpad.net/yade/+question/704311

I want to move the facet in a sinusoidal motion.
So, I used the Partial engine(Rotation Engine) and changed angular velocity with virtual time.

For example, O.engines is defined as follows;

O.engines=O.engines+[RotationEngine(rotateAroundZero=True, zeroPoint=(0,0,0), rotationAxis=(1, 0, 0), angularVelocity=rad_vel, ids=- -)]

And the angularVelocity is changed by function, cal_wall_rot()

def cal_wall_rot():
       global rad_vel
       rad_vel = "function of sine(O.time)"

Finally, the function, "cal_wall_rot()" is called in every step.
O.engines=O.engines+[PyRunner(command='cal_wall_rot()', iterPeriod=1)]

However, the variable "rad_vel" is not changed during the simulation.

Anyway, I have found another way to change the velocity of the facet using b.state. 

Is this the only way to control the motion of bodies with time?


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