Large machine resonance
Large machine resonance
(OP)
A demonstrated resonant condition exists in a gearbox. Vibration of 1"/sec is measured on the structure at 330 Hz. The gearbox is driven by a 1000 HP DC motor and runs a rolling mill. The gearbox is about 6' by 6' by 4'. It sits on a concrete foundation that reportedly extends 8 feet underground. An operation deflection shape animation indicates that the foundation is rocking back and forth at the resonant frequency. The resonant frequency is gearmesh frequency. Here is the question: is it reasonable to have a resonance on such as masssive structure at 330 Hz. or should I be seeking another source?






RE: Large machine resonance
Cheers
Greg Locock
RE: Large machine resonance
If the shaft or casing were resonant, would you expect all sections of the entire gearbox to be moving basically in phase?
RE: Large machine resonance
(1) how many locations were monitored?
(2) How sure are you that the signal is good?
Cheers
Greg Locock
RE: Large machine resonance
91 DOFS were monitored using a stationary and roving accelerometer. Data were taken twice on perhaps 1/3 of the points to verify repeatability. Data collection was consistent.
RE: Large machine resonance
Cheers
Greg Locock