Analysis of blasting vibration and disturbing vibration

A large number of vibration data are compared and analyzed in various environmental ground conditions by using the measured data of a large number of vibration measured in the station of the Qingdao Metro and the station West Town, the falling of the objects, the personnel passing through, the knocking on the ground, incorrectly triggering the sensor and the continuous contacting surface of the object. The "vibration decay time" is defined as the time when the maximum value of the wave appears in the vibration velocity diagram until the maximum value of the wave is stabilized to less than 10% of the maximum value. The following conclusion is drawn: if the vibration decay time is lower than 0.1s, it can be judged to be a non-blasting vibration. When the vibration decay time is above 0.1s, the Fourier transform is simplified and its amplitude spectrum is obtained. If the excellent frequency band is 130Hz similar to 230Hz, it is blasting vibration. If the excellent frequency of vibration is larger than 450Hz, it is a disturbing vibration.