Belt Drive simscape block

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Kory O'Connor
Kory O'Connor 2018-3-27
回答： Steve Miller 2023-5-9
I want to model a belt drive with inertia on one side and constant velocity on the other side. All the variables are default and the pulley ratio is 1. With no inertia the velocity plot at puley A and B is as expected, equal.
But when I add inertia to pulley B the steady state velocity becomes an extreme value, around 13e4 which does not make sense to me. I understand that inertia would slow the response time of the pulley but why does it increase the velocity by a factor of 4?
Am I using this block wrong or is there an error with the block?
Simscape with no inertia on pulley B
Simscape with inertia added to pulley B

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回答（1 个）

Steve Miller
Steve Miller 2023-5-9
Without looking directly at the model, it is difficult to know what is causing this behavior. I suspect the initial speed of the inertia you added ends up being non-zero at the start. The variable-ratio transmission has spring-dampers in it and so the input and output shaft speeds can be different. If the stiffness of those spring-dampers is not commensurate with the inertias, you can get behavior as you see on your second figure.
--Steve

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