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i am in great need of help.........

i need to determine the critical speed of a vertical shaft using ansys software .......my questions are:

1. which kind of element type should i choose?

2. wiil it be ok if i carry out the analysis without giving any constraints as it is not supported by bearings...it just has a line contact so what kind of boundary constraints am i supposed to give..

plzzzzzzz help me as soon as possible

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# To find the critical speed of a vertical shaft

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