Pipe bending stress, deflection, and vibration
The pipe supports the shaft, so it will also experience the centrifugal
force from the rotor imbalance. This fatigue bending stress is highest
at the lowest part (root) of the pipe. A big mild steep pipe with 27mm
diameter, 2.5mm thick, and 400mm long is used, so the calculated fatigue
bending stress is small and so is the deflection. The pipe is very stiff
with very high frequency. In the vibration calculation, the frame was
assumed to be a fixed support while the pipe as a cantilever supporting
the rotor mass.
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