| 摘要 |
A system, method and software product for prescribing rigid body in finite element analysis is described. According to one aspect, user defines a rigid body orientation time history based on a variety of schemes including, but not limited to, direction cosine, orientation angles, Euler parameters, Rodriguez parameters, and Caley-Klein parameters. The unique combination in one of the schemes is converted to direction cosine time histories first. The direction cosine matrix can then be interpolated from either the defined or the converted direction cosine time history at each solution cycle. The time derivative of the direction cosine matrix and the resulting angular velocity matrix are calculated. The solution for the equation of motions is obtained using calculated angular velocity for each solution cycle until the simulation ends. According to another aspect, the present invention interpolates user specified rigid body orientations time history in several schemes including, piecewise linear, cubic spline.
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