September 21, 2004

• An eigenvalue analysis under consideration of centrifugal force is performed, and the result is compared with that of ANSIS. The contribution of centrifugal force the to the stiffness matrix is refered as spin softening or centrifugal softening.

  The model is a plate parallel to the x-y plane. All the elements is the rectangular shell. The number of elements and nodes are 124 and 126, respectively. The thickness of the plate is assumed to be 0.1. The nodes on the red line in the right hand figure is fully fixed. The axis of rotation is the y-axis.

  The Young's modulas, poisson ratio and mass density are 3�~10⁸, 0.3 and 1�~10^-4, respectively.

  
• The angular velocity is assumed from 0 [1/sec] (no spin softening) to 2821 [1/sec] (upper limit of the calculaton). The correspondig eigen frequency is compared with the result of ANSIS. The result is as follows:

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