Vibration signal acquisition method for intershaft bearing

Abstract

The invention belongs to the detection technology field and relates to a vibration signal acquisition method for an intershaft bearing. The method includes the steps: utilizing an accelerometer to acquire a vibration signal of an intershaft bearing and a specially-produced sensor installation clasp, the sensor installation clasp being formed by a left half clasp and a right haft clasp that have exactly the same symmetrical structure; and installing the accelerometer on the sensor installation clasp to minimize the influence of imbalance upon a rotor shaft due to installation of the sensor. According to the acquisition method, the structural dimension of the sensor installation clasp is determined at first, the accelerometer is then installed, and finally, the vibration signal of the intershaft bearing is acquired. The installation mode of the accelerometer is improved. The method is capable of accurately acquiring the vibration signal of the intershaft bearing, a signal to noise ratio of the signal is increased, data is provided for fault diagnosis and state monitoring of the intershaft bearing, and great convenience is brought to subsequent monitoring and diagnosis.

Description

technical field [0001] The invention belongs to the technical field of detection and relates to a method for collecting vibration signals of an intermediate bearing. Background technique [0002] Intermediate bearings are widely used in various mechanical equipment, such as the dual-rotor test bench of aero-engines, which use intermediate bearings for support. The performance of the intermediate bearing directly affects the working status of the entire equipment, so it is necessary to monitor its status and diagnose existing faults in time, which depends on accurate signal collection. In November 2013, Liao Mingfu and others pointed out in the "Fault Characteristics and Diagnosis Methods of Aeroengine Intermediate Bearings" in the Journal of Aerodynamics, periodical number 11-2297 / V: At present, the acquisition of vibration signals of intermediate bearings uses The vibration of the force casing, the fault characteristic information of the intermediate bearing is analyzed fr...

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Problems solved by technology

[0003] The aero-engine double-rotor test bench adopts the support method of intermediate bearings. The intermediate bearings are used to connect the high and low pressure rotor shafts. The outer ring and inner ring rotate synchronously with the high and low pressure rotor shafts respectively. , the signal-to-noise ratio of the fault signal of the intermediate bearing is extremely low, and it is not easy to install the sensor directly on the outer ring of the intermediate bearing, which brings great difficulties to the follow-up diagnosis work. Therefore, it is urgent to propose a method that can directly collect the vibration signal of the intermediate bearing. method

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