当机械系统发生故障时振动噪声信号能量的空间分布与正常系统的振动信号相比会发生相应的变化即信号的能量改变包含着丰富的故障特征信息。构造特征向量以各频带的能量为元素构造能量特征。对第4层的所有节点进行分析提取频带信号能量改写句子

When a mechanical system experiences a failure, the spatial distribution of the energy of the vibration noise signal changes compared to the vibration signal of a normal system. Therefore, the change in signal energy contains abundant information about the fault characteristics. A feature vector is constructed by using the energy of each frequency band as an element to construct the energy feature. Analysis is performed on all nodes of the fourth layer to extract the frequency band signal energy