Abstract
This paper is a study on the response of rotating hard disks subjected to a half-sine acceleration in the axial or pitching direction. The solution is obtained by using the multimodal expansion approximation and applying the Galerkin method to the resulting equations. Numerical results are obtained by using the Newmark β method for 5.25", 3.5" and 2.5" hard disks spinning at 3 600 rpm. It is found that the disk holds its maximum displacement and acceleration when the input duration τ is about 1.5 times the natural half period of the (m, n)=(0, 0) mode. Here, m and n are the numbers of nodal circles and diameters, respectively. Results also show that the acceleration with 11 ms, which is nowadays widely used as a standard input on the shock test of the disk drive units, leads to only 60-70% of the maximum displacement and acceleration.
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