Gear case fault detection method combining vibration and sound wave monitoring

Abstract

The invention discloses a gear case fault detection method combining vibration and sound wave monitoring. The method is achieved by a vibration signal fault detection system and a sound wave signal fault detection system. The method comprises steps of 1, adhering an accelerometer on the casing of a gear case, installing an acoustic sensor outside the gear case, and installing a speed measurement sensor on a gear rotary shaft; 2, arranging a signal adjusting and data collecting device outside the gear case; 3, processing data collected in the step 2 by a data processor to obtain a vibration waveform and an acoustic waveform; and 4, comparing the vibration waveform obtained after data processing with a normal vibration waveform of the gear case, supplementing comparison data of the vibration waveform by comparison data of the acoustic waveform, and performing final determination. Accordingly, by means of superposition of the vibration signal fault detection system and the sound wave signal fault detection system, the final detected data are enabled to be more accurate, and failure factors of the gear case can be well mastered.

Description

technical field [0001] The invention relates to the detection field, in particular to a gear box fault detection method combined with vibration and sound wave monitoring. Background technique [0002] Due to its fixed transmission ratio, large transmission torque and compact structure, the gearbox has been widely used in various machinery and equipment, and has become a variable speed transmission component of various machines. Especially in wind turbines, the gearbox can affect the effective utilization of the entire energy. Once the gearbox fails, it will stop the operation of the entire wind turbine. According to statistics, among the failure parts of the gearbox, the failure proportion of the gear itself is the largest, accounting for about 60%. It can be seen that the gear transmission is an important part that induces machine failure. Therefore, it is of great significance to carry out gearbox fault diagnosis. [0003] Fault diagnosis research on gearboxes has been g...

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Problems solved by technology

[0005] 1) Since the vibration signal measured in the actual state is very complex, it generally includes the meshing vibration between gears, the rotational vibration of the camshaft, the resonance of the gearbox box, etc.; at the same time, the signal sampled on site also includes A large amount of measurement noise, the signal collected by the sensor is often a mixed signal generated by different signal sources, so the signal-to-noise ratio is low, which greatly affects the accuracy of the vibration signal characteristics for the diagnostic method;

[0006] 2) In addition, the sensor is installed on the gearbox. When the gears and shafts in the gearbox are running, a large amount of heat will be generated, which will gradually increase the temperature of the air in the gearbox, thereby making the environment around the sensor The temperature is abnormal, and the electronic components such as the sensor are greatly affected by the temperature, so the signal collected by the sensor will be inaccurate, which will affect the accuracy of fault detection and even cause damage to the sensor

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