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For Center of rotation, the spring will be attached to the center of rotation as defined in the parent Rigid Connector node.
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In 2D the Spring constant is only a single scalar, representing the stiffness for rotation around the out-of-plane direction. Similarly, the Moment as function of rotation is a single scalar.
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For Scalar (Same for all components) enter a single Loss factor for spring ηu,s, which is used to multiply all values of the spring matrix or spring force vector.
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For Individual components select Isotropic, Diagonal, Symmetric, or Full, then enter values or expressions in the table for the Loss factor for spring ηu,k or ηf based on space dimension. The loss factors act on the corresponding components of the spring matrix or spring force vector. If you select Isotropic, the effect is the same as when you select Diagonal and enter the same value for all diagonal elements.
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