Monitoring system and online monitoring method for working state of engine bearing

Abstract

The invention provides a monitoring system and an online monitoring method for the working state of an engine bearing, the monitoring system comprises a reading antenna, a signal conditioning circuit and a sensor group, the sensor group comprises a passive MEMS temperature sensor, a passive MEMS rotating speed sensor and a passive MEMS vibration sensor, and the passive MEMS temperature sensor, the passive MEMS rotating speed sensor and the passive MEMS vibration sensor are respectively arranged on a bearing inner ring, a retainer and a bearing outer ring. The online monitoring method comprises the steps that a temperature signal, a rotating speed signal and a vibration signal are acquired and output to a reading antenna, and the reading antenna outputs an initial acquisition signal to a signal conditioning circuit; the signal conditioning circuit carries out filtering modulation, noise reduction, power amplification, frequency division processing, feature extraction and the like on the initially collected signals and then outputs a temperature output curve, a rotating speed output curve and a vibration output curve, the engine bearing temperature, vibration, rotating speed and other parameter feature frequencies can be accurately obtained, and the accuracy of monitoring data is improved.

Description

technical field [0001] The invention relates to the technical field of monitoring the working state of an aero-engine bearing, in particular to a monitoring system and an online monitoring method for the working state of an engine bearing. Background technique [0002] During the working process of the aero-engine, it is necessary to monitor the temperature, vibration, rotational speed and other parameters of the bearing during the working process, so as to grasp the condition of the engine in a timely and accurate manner, so as to avoid its extreme environment, such as: the temperature of the inner ring of the bearing is too high. Working under abnormal working conditions such as high temperature (>250°C), excessively fast cage speed (>10000rpm), and excessive vibration of the outer ring (>100g), the bearing failure caused by it will lead to parking in the air, and even seriously affect the flight safety. . [0003] With the gradual improvement of the performance ...

AI Technical Summary

Problems solved by technology

[0004] At present, when monitoring parameters such as temperature, vibration, and rotational speed of engine bearings, since the inner ring of the bearing and the cage rotate at high speed, and the temperature at the position of the inner ring of the bearing and the cage is high, the sensors are mostly installed outside the outer ring of the bearing. Collect data on the surface, and monitor the bearing temperature and rotational speed by back-calculating the collected data. The monitoring accuracy is low, which is not conducive to bearing fault monitoring and life prediction. It is difficult to accurately grasp the actual situation of the engine, and there are hidden dangers to flight safety.

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