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DRC sim: IMU joint

The current Atlas model incorporates an 'IMU joint'. We were wondering why this needs to exist. Is it just a quick way to calculate the acceleration of a given point on the robot with respect to the world?

I'm guessing from the fact that the joint limits are 0 in both directions that this joint tries to simulate a rigid connection. I'm worried however that since the mass of the attached body is quite low, the joint limit stiffness and damping can't be very high without causing instability. So my worry is that we're going to end up with an IMU that is only loosely attached to the body it tries to measure the acceleration of.

Could you try to alleviate my worries? ;-)