对正常工况下的振动信号采用GOA-VMD算法分解，其中GOA优化过程中

Normal operating conditions of vibration signals using GOA-VMD decomposition algorithm, wherein the optimization process GOA local minimum entropy changes with the number of iterations is shown in FIG. It is seen from FIG. 5, when the seventh iteration, beginning fitness value converges, then begin to stabilize.

The vibration signal under normal operating conditions is decomposed by GOA-VMD algorithm, wherein the local minimum entropy changes with the number of iterations in the GOA optimization process as shown in Figure 5. As can be seen from Figure 5, when the 7th iteration, the fitness value begins to converge and then stabilizes.

The normal vibration signal is decomposed by goa-vmd algorithm, and the change of local minimum entropy with the number of iterations in the process of Goa optimization is shown in Figure 5. It can be seen from Figure 5 that at the 7th iteration, the fitness value starts to converge and then becomes stable.<br>