Physics Module: Classical Mechanics: Two rigid bodies connected by a torsion spring with damping.

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iai

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Dec 20, 2016, 10:05:04 AM12/20/16
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Please let me know how to model a spring that connects two rigid bodies. I am modeling a system of two rigid bodies connected by a torsion spring with damping, and trying to get equations of motion using LagrangesMethod(.). This system is free flying. 

I know I can assign the potential energy to a Particle object. But in my case above, I don't know how to divide the energy stored in a spring to the two bodies.

Jason Moore

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Dec 21, 2016, 5:07:17 PM12/21/16
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The API is not well designed for applying potential energy from springs. As a workaround, you can define the entire system's potential energy and attach it to one of the bodies potential_energy attribute. The Lagrangian will be properly calculated. Make sure not to double count any of the potential energy components.

The API probably needs a way to specify the potential energy expression when calling the Lagrangian function.



On Tue, Dec 20, 2016 at 12:58 AM, iai <i...@axelspace.com> wrote:
Please let me know how to model a spring that connects two rigid bodies. I am modeling a system of two rigid bodies connected by a torsion spring with damping, and trying to get equations of motion using LagrangesMethod(.). This system is free flying. 

I know I can assign the potential energy to a Particle object. But in my case above, I don't know how to divide the energy stored in a spring to the two bodies.

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Jason Moore

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Dec 21, 2016, 5:12:54 PM12/21/16
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