How to determine when the natural frequency of the equipment foundation is the same as the operating frequency of the equipment
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Our factory has a 2000KW motor, with vertical vibration of 5.6 mm/s, radial vibration of 1.8 mm/s, and axial vibration of 7.2 mm/s. Many spectra were generated, and various experts concluded that the reason for the high vibration levels of the motor was the weak foundation on which it was mounted (the steel structure), which led to excessive vibration. May I ask how to determine whether excessive equipment vibration is caused by a weak motor foundation? How is a spectrum generally manifested?
Disconnect the motor coupling for testing; if the soft foot is not loose, the single-frequency value is usually very high. If it becomes loose, higher-order harmonics will also appear. Then measure the phase at 90°; if, from a phase perspective, it’s not a problem with balance or alignment, then it’s a problem with the soft footings