Anyone familiar with how the "gravity" feature works in Simulation? Is the gravity acceleration applied to the nodes of the mesh like a gravity field, or is it applied only through the system center of gravity?
From what I understand, the algorithm calculates "mg" for each element, they call it a "body force", and distribute to the nodes via addition to the external force vector. So it acts like a uniform load throughout the entire volume of the structure.
I've got a 2-beam arm linkage (think of it like a bicep and a forearm, with it fixed at the shoulder), and I've been calculating the spring constant necessary to balance it in various positions. However, gravity doesn't seem to be working properly; the forces on the "bicep" should increase if the "forearm" is horizontal rather than vertical, because the center of gravity is further out. But I've been getting the same force results either way. Does anyone have any ideas about how to solve this problem?
Hi Jeff: I would expect the vertical reaction to be the same, but the moment at the shoulder fixture would increase with the forearm in a horizontal position. Can you measure the moment at the shoulder?
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