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rotation spring setting

Dear all, these days I use combin14 to simulate the boundary conditions. I use two types of springs to simulate support. One is linear displacement spring, the other one is rotational spring. When the spring is on the radial edges, the rotation is about radius direction. When the spring is on the circumferential direction, the rotation is about circumferential direction. So i translate all the nodes to local cylndrial coordinate system. When the spring constants are large enough, the simulation results do not meet well with the clamped boundary conditions. I am not sure for the rotation spring in cylindrical coordinate system. But i have already tried on rectangular plate, it is wright. So please help me on this problem. Thank you for your concern

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