The reasons for vibration of the vibration instrument include the inability of materials to be perfectly homogeneous, precision limitations in manufacturing, and wear and tear after use, all of which can cause vibration of the moving object. According to physics, the vibration of a rotating object exhibits a sinusoidal waveform. The vibration waveform measured on rotating machinery is the comprehensive vibration of many parts. The complex waveform of comprehensive vibration can be mathematically decomposed into sinusoidal waveforms of different parts.

Failure mode: Generally, when rotating machinery is between 600 and 120000 cpm, the failure mode is fatigue failure. Therefore, the main measurement unit is the "speed" that is proportional to the "frequency". At low frequencies (usually below 600 cpm), the failure mode is displacement failure, so "displacement" is the main measurement unit. At high frequencies (usually above 120000 cpm), the failure mode is force failure, therefore "acceleration" is the main measurement unit.

The unit meaning of the three elements of vibration project amplitude displacement displacement μ  The magnitude of vibration amplitude, velocity, mm/sec, acceleration of vibration, acceleration of vibration, frequency of change in vibration speed, cpm, or hz. The frequency of vibration per unit time can be analyzed. The phase angle (degree) of the vibration source can be compared with the relative position of the two vibrating bodies, and the vibration mode can be analyzed

diagnostic method 

Judgment: Based on a certain benchmark, common judgment criteria include ISO, VDI, API, etc.