Data acquisition and measurement method for fatigue pitting test of spur gear

The main data acquisition method of cylindrical gear fatigue test-bed is to collect and record the data through the real-time monitor set on the test-bed, such as the temperature sensor, torque meter, speed meter on the structural diagram 1, and the vibration acceleration amplitude along the transverse component (x-axis) and vertical component (0-axis) of the gearbox shaft end, etc. The collected data are stored in the hard disk of the microcomputer, so that the statistical analysis of the system response signal data in time domain and frequency domain can be carried out in the later stage, so as to study the dynamic response characteristics of the system from the healthy state of the gear to the fatigue pitting phenomenon.

Gear fatigue test has the characteristics of long test cycle and excessive test record data. In order to observe the evolution process of gear tooth surface geometric characteristics more truly, effectively and in real time, in the process of gear fatigue test, the teeth of each test gear are numbered in turn, which is mainly to facilitate the later tooth surface detection to determine the tooth profile and realize the same purpose A comparative study on the same position data of a gear tooth.

At the same time, in the aspect of test data recording, due to the defects of long test cycle and more test data, it is not conducive to the storage and comparative study of test data by microcomputer. In the process of the test, the running in stage of the gear in the early stage was removed, and then the test bench was shut down for every 1 million cycles. The test gear was disassembled, and the tooth profile accuracy of the numbered teeth was detected and recorded by the professional D80 gear measurement and detection center (Fig. 2), and the geometry of the tooth surface was recorded in the form of photos. After all the measured data are recorded, the gear is reassembled according to the original installation position in the gearbox, and the gear fatigue test is continued. The accuracy test and data of the tooth surface per 1 million cycles were recorded repeatedly until the obvious fatigue pitting occurred on the tooth surface.

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