Why do we calculate natural frequency of crankshafts?
Answer:
The only reason I can think of, is that rotating crankshafts have a natural resonant frequency at which vibration would be the highest.
I suspect they do so to ensure that the natural resonant frequency of the rotating crankshaft doesn't coincide with the RPM's required to cause a car to do the accepted speed limits.
For example, you don't want the resonant frequency of the crankshaft to coincide with the RPM's required for an engine to drive a car at 55 MPH, as it would quickly destroy valve stems because of the stress caused by long-term exposure to this vibration.
That's my guess..
because natural frequency of crankshafts causes FATIGUE and fatigue WILL cause failure..
as far as I know ANSYS just helps to calculate..as a software
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