Pulling against Gravity with a Pulley System

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Matthias Hueber
Matthias Hueber 2020년 11월 22일
댓글: Matthias Hueber 2020년 11월 23일
I am getting startet to work with Simscape and I made a very Simplistic crane which purpose is only to pull up a mass with a cable system.
I managed to build the Cable system, but when i insert a input signal for the "Revolution Joint" the mass just drops. I tried changing the rotation of the joint an I am convinced that the problem is that the pulleys can not pull against the gravity. Is it a problem that i used the pulleys on cylinder ?

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Juan Sagarduy
Juan Sagarduy 2020년 11월 22일
Hi Matthias
It is difficult to say what happens without the model. But i wonder if the rigid transform between the revolute joint and the spool can be the cause of the problem. If the sign or value of torque are adjusted, and you see no difference, it is likely it.
In one of our examples port R (spool) and port F (winch joint) are directly connected. https://se.mathworks.com/help/physmod/sm/ug/block-and-tackle-with-four-pulleys.html
Hope this helped out. BR Juan
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Matthias Hueber
Matthias Hueber 2020년 11월 23일
I got to a solution. Thank you very much.

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