Rush Engineering, Inc.
Structural Testing and Acoustic Noise Analysis
Motor vibration creating excessive noise in pump station.
Motor shell instrumented to measure starting and running
Internal components on motor instrumented for vibration and noise
Components bend due to electromagnetic and mechanical forces of
External shell components vibrate like drum surfaces transmitting acoustic
noise to surroundings.
Starting and rundown transients indicate noise is sensitive to frequency
band near 700 Hz.
Acoustic noise transient increases with speed.
Vibration acceleration transient increases with speed.
Motor side panel radiating high acoustic noise levels.
Motor shell drumming loud acoustic noise due to "panel resonance."
Acceleration spectrum shows vibration resonance amplification of 683.8
Hz and 720.7 Hz components.
Acoustic noise spectrum shows highest amplitude at 683.8 Hz and 720.7
Motor shell braced to detune panel resonance,
and rotor windings modified to eliminate exciting force.
it's dynamic, it's a Rush
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