变压器随着不同状态的松动状态影响，振声信号在某些 频带的能量会发生变化

With the influence of the loose state of the transformer in different states, the energy of the vibro-acoustic signal will change in certain frequency bands. The energy contained in the same-order IMF component of different types of signals is different, so the energy coefficient can be used as one of the characteristic parameters. In this method, the energy coefficient of the i-th order IMF component can be defined as

Transformers with the loose state of different states, vibration signal in some frequency band of energy will change, different types of signals in the same order of IMF components containing different energy, so the energy coefficient can be used as one of the characteristic parameters. The energy coefficient of the ith IMF component in this method can be defined as

With the influence of different loose state of transformer, the energy of vibroacoustic signal will change in some frequency bands, and the energy of different types of signals in the same order IMF component is different, so the energy coefficient can be taken as one of the characteristic parameters. In this method, the energy coefficient of the first order IMF component can be defined as