Online detection method for ball bearing contact angle of aero-engine

Abstract

The invention discloses an online detection method for the ball bearing contact angle of an aero-engine, and the method comprises the steps: installing a magnetoelectric vibration speed sensor on theinstallation edge of a casing before the aero-engine operates; connecting the output of the sensor to a vibration signal analyzer, meanwhile, connecting a rotating speed signal, and setting the vibration signal analyzer to be in an order tracking analysis mode to test and analyze the case vibration signal of the aero-engine in a small rotating speed state; when characteristic frequencies appear onthe two sides of the high-voltage rotor, extracting the frequencies; and analyzing the rolling bearing fault type corresponding to the characteristic frequencies, and calculating the actual contact angle of the ball bearing through a frequency formula. The method has the advantages that the actual contact angle of the ball bearing is calculated through the small-rotating-speed state characteristic frequency and used for determining the rigidity of the bearing so that the simulation calculation result of the aero-engine is closer to the operation rule of an actual engine; the method is used for improving bearing parameters and improving the ball bearing design level. The method is used for discovering vibration faults in advance and removing the vibration faults in a targeted mode, and theaccuracy reaches 80% or above.

Description

technical field [0001] The invention relates to the field of aero-engines, in particular to an online detection method for contact angles of aero-engine ball bearings Background technique [0002] The vibration of rolling bearings can be caused by external vibration sources, and also by the structural characteristics and defects of the bearing itself. In addition, the fluid dynamics generated by the lubricant when the bearing is running can also be a source of vibration (noise). When the above-mentioned vibration sources are applied to the bearing parts and the nearby structural parts, they will all excite vibrations. In general bearing vibration tests, vibration sensors are installed on the bearing housing, but the vibration sensor cannot be installed on the bearing housing during the test run of the aero-engine. Only the vibration at the installation side of the casing can be tested, and the abnormal vibration of the bearing is weakened through the transmission path. Aer...

AI Technical Summary

Problems solved by technology

Generally, the vibration sensor is installed on the bearing seat for the bearing vibration test, but the vibration sensor cannot be installed on the bearing seat during the test run of the aero-engine. Only the vibration of the casing installation side can be tested, and the abnormal vibration of the bearing is weakened through the transmission path.

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