Experimental data acquisition of planetary gearbox based on EEMD symmetric differential energy spectrum

In this paper, the vibration data of the whole life cycle of the wear fault are obtained by testing the tooth surface wear fault of the planetary gear box. The experiment is shown in the figure. The experimental platform consists of planetary gear box, motor, brake and its controller, data acquisition system (acceleration sensor, eddy current sensor, etc.). Acceleration sensors are arranged at measuring points 1 to 3 to measure vibration signals: measuring point 1 corresponds to the position of the second stage of planetary gear box (at an angle of 45 ° with the horizontal direction); measuring points 2 and 3 correspond to the vertical and horizontal positions of the third level respectively. The eddy current sensor is placed at measuring point 4, and the real-time speed of the output shaft can be obtained by cooperating with the speed measuring gear plate.

Parameters of planetary gear box: G1 represents the first stage planetary gear, G2 represents the first stage sun gear, G3 represents the first stage inner ring gear, G4 / G6 represents the second and third stage planetary gear, G5 / G7 represents the second and third stage sun gear, and G8 represents the second and third stage common inner ring gear.

In the experiment, in order to speed up the speed of gear wear, the load is applied and individual gears without heat treatment are used to speed up the experiment progress. In the experiment, the sampling frequency is 20480hz, the sampling interval is 10min, and the sampling time is 10s. The torque of magnetic powder brake is set at 8.33n · M. The test lasted for 9300 minutes. The vibration signal of measuring point 2 was used to analyze the data.

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