According to the test in experiment 2, the speed of three-phase variable frequency speed motor is set at 560 r/min and the sampling frequency is 1000Hz. The magnetic particle brake is adjusted so that its load torque is 7.5N.m, 5N.m, 2.5N.m and 2.5N.m respectively.0N m, the time-domain response of vibration acceleration of reduced-speed integrated gear drive system is obtained. After noise reduction, the time-domain response of radial vibration acceleration of non-circular gear is given as shown in Fig. 1a, 2a, 3a, 4A and 5A respectively. The corresponding amplitude-frequency curves are shown in Fig. 1b, 2b, 3b, 4B and 5b).

It can be clearly seen from the time-domain diagram in Figure 1 to Figure 5 that with the increase of load torque, the amplitude of vibration response changes significantly. The peak-to-peak values of time-domain response of vibration acceleration in five groups of data, i.e. load torque increases from 0N.m to 10N.m, are respectively taken out and the curve of PPV value with load torque shown in Figure 5 is obtained.

It can be seen from the diagram that as the load torque increases, the peak-to-peak value of the measured vibration acceleration response decreases first and then increases.Increase to 2.5N.m at 0N.mDuring the process, the peak value of vibration acceleration response decreases rapidly because the gear system is in bilateral impact state when the gear is running in no-load state. At this time, the vibration knocking phenomenon of the gear is more serious. Therefore, the peak value of response is larger. With the increase of load torque, the separation and impact of the two gear teeth will not occur again, and the gear knocking phenomenon disappears, so the peak value of response is larger.The value decreases rapidly, then with the increase of the torque, the gear does not clap, and the vibration increases gradually with the increase of the load, which is basically consistent with the variation rule of gear vibration peak value with the torque obtained by theoretical analysis.