Table 1: Spindle natural frequencies; DSM versus FEA for a nonspinning (  RPM), with simply supported boundary conditions.

ModeDSMFEA B33 element (Hz)FEA C3D20R (Hz)FEA C3D10M (Hz)
12 sections600 elements1200 elements16965 elements20122 elements34465 elements45645 elements

11392.921393.001393.001308.001308.001301.001301.00
21393.241393.001393.001308.001308.001301.001301.00
34071.024071.004071.003208.003212.003335.003322.00
44071.344071.004071.003210.003212.003335.003324.00
55668.145669.005669.004339.004311.004322.004291.00
65668.465669.005669.004341.004316.004323.004292.00