How can I make an elastic pendulum using Simmechanics 2nd generation

2014 11 12
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更新时间：2014 11 13
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How can I define a pendulum suspended on an elastic rope in 3D using blocks from SimMechanics 2nd generation? It should have the ability to swing like a pendulum in 3D (spherical joint) and oscillate like a vertical spring oscillator at the same time. Thanks for suggestions!

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Manuel
Manuel 2014-11-12

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Hi Jan,
You can do that by introducing a prismatic joint on your pendulum and specifying internal mechanics with some spring stiffness. You can look at the doc of the prismatic joint: http://www.mathworks.com/help/physmod/sm/ref/prismaticjoint.html
Regards Manuel

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Jan Balajka
Jan Balajka 2014-11-13
Thank you, that was helpful. However I didn't understand how to set correct equilibrium length in internal mechanics of the prismatic joint. If I set it to zero the two bodies coincide, if I set it to some value, the direction is undefined and the suspended body starts flying around the fixed one. Therefore I started using prismatic joint with all values set to zero and rigid transform of the desired spring length in series. In parallel to these two I put spring&damper force where I set the correct spring parameters. It is perhaps not the nicest solution but it seems to work. Thanks, Jan

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