Multistage Pump Resonance - Modal Testing - Mode Shapes
Modal testing identified natural frequencies at 48Hz and 84Hz, indicating mechanical looseness and potential resonance. Horizontal support reduced vibration levels by 85% and shifted the natural frequency to 54Hz.
Excessive horizontal vibration in a pump, indicating mechanical looseness and potential resonance, causes frequent failures.
Modal testing was performed to identify potential natural frequency conditions in the machine and its base. The equipment was shaken with a modal hammer while accelerometers collected vibration data.
The Modal Test study identified effective natural frequencies at 48Hz and 84Hz, corresponding to the horizontal 1st and 2nd modes of the pump.
Mode shapes of the first (48Hz) and second (84Hz) modes are shared, indicating the need for horizontal support to safely move natural frequency regions.
Horizontal support of the pump reduced vibration levels by 85% and shifted the natural frequency from 48 Hz to 54 Hz, decreasing the likelihood of failure.
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