Why the angular velocity is not constant?

Question

amatoallah ouchen 2022-10-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1818260-why-the-angular-velocity-is-not-constant

评论： amatoallah ouchen 2022-11-6

GG.slx

Greetings

While running my mechanism , I have inputed a constant velocity of 1 rad/s to my motor and then I was watching the velocicities of the other part of the mechanisms.

In order to remove any kind of inertia I put the gravity g to [0 0 0] instead of [0 0 -0.981]

this the velocity profile

But the the velocity of the motor is still not constant

I have also attached the entire mechanism in sismscape

Any hint?

thank you!

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Answer 1

Steve Miller 2022-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/1818260-why-the-angular-velocity-is-not-constant#answer_1092388

You have only configured your motor to have an initial speed of 1 rad/s. To specify that the motor should always move at 1 rad/s, no matter what the load is, you need to feed it an input signal that increases by 1 rad each second.

Configure the Revolute Joint to accept motion as an input signal and automatically calculate the torque
Add a Ramp block
Add a Simulink-PS Converter block
Connect as shown in the screenshot below.
Replace Revolute Joint O with this new joint