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How to place a Point mass on COMSOL
Posted 8 mai 2024, 12:56 UTC−4 Structural Mechanics, Physics Interfaces, User Interface Version 6.2 2 Replies
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Good morning everyone,
Im currently working on a Eigenfrequency Prestressed study.
I want to put a point mass at the top face of the lower flexure (see the image below)
I attached another image that show where i want the point mass (see the image with the blue arrow).
For referance I attach the mph.file for the system that is used for the simulation and a image of what it look like.
Before I put a point mass I use a cube with a very high density with interia and placed it where arrow is at but it won't be useful for long term research, and before I use a point load but it have no mass of interia.
An idea that I have is to use a added mass load but it only for boundary but I am not sure it a correct substitute for the point mass.
Any help or advice much appreciated thank you.
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There is no point mass feature in the Solid Mechanics interface. The reason is that a point mass causes a type of singularity, similar to a concentrated force. It is better to distribute the mass over some small boundary, using an Added Mass node.
You can also use a Rigid Connector with a Mass and Moment of Inertia subnode. Note that you can select a flexible formulation, if the constraints imposed by the rigid connector are too hard.
-------------------Henrik Sönnerlind
COMSOL
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got it i will use an added mass boundary thank you very much!