Sympy physics mechanics

[Peter Stahlecker]

I try to model a simple one mass point pendulum in 3D, the mass point is located on the y - axis, at a distance d. Rotations around the y-axis do not make physical sense, hence, I use only qx, qz to describe the angles of rotation of the frame of m.

If MM is the mass matrix, I get determinant(M) = 0.

As this pendulum is so simple, I do not think I made a mistake modeling it.

What could be the problem?

Thanks for any help!

[Jason Moore]

Peter,

You'll have to share your code for us to help, as this isn't enough information.

Jason

moorepants.info
+01 530-601-9791

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[Peter Stahlecker]

Dear Jason,

I had to send it by separate mail, as I di not know how to attach a file to gmail.😩😩😩

Thanks, Peter

To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAP7f1AhLe%2Bz2%3DH-0oEt%3DOeKYrjf%2B4LWN_zArxPc1sF2yu7jypg%40mail.gmail.com.

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Best regards,

Peter Stahlecker

[Jason Moore]

Peter,

The ideal way to do this is to paste the code into the email or in a Github discussion. Making the code as short as possible to demonstrate the issues is also helpful.

Here is a good example: https://github.com/sympy/sympy/discussions/22848

Jason

moorepants.info
+01 530-601-9791

To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CABKqA0YJ9Oa6TQy%2BMDuBGP6FqduhRjfGJKDkz7czMRKz1qrDTQ%40mail.gmail.com.

[Peter Stahlecker]

Dear Jason,

I think my code is short, but I will have to ask my son how to attach a file to gmail.

Thanks, Peter

To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAP7f1Ai_8qmJjpUTp%3DYrD6_cii4veTm6uC7kr05BMQxva-grqQ%40mail.gmail.com.