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Vibration signal acquisition method for intershaft bearing

A bearing vibration and signal acquisition technology, which is applied in the detection field, can solve problems such as difficult direct installation of sensors, low signal-to-noise ratio of fault signals, and difficulty in diagnosis, so as to improve the signal-to-noise ratio and facilitate follow-up monitoring and diagnosis.

Inactive Publication Date: 2015-11-18
DALIAN UNIV OF TECH
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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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  • Vibration signal acquisition method for intershaft bearing

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Embodiment Construction

[0014] The present invention will be further elaborated below in combination with the accompanying drawings and the technical solutions of the description.

[0015] The invention discloses a method for collecting vibration signals of intermediary bearings, the working principle of which is as follows: the sensor installation buckle rotates synchronously with the high-voltage rotor shaft, the acceleration sensor is fixed on the sensor installation buckle through a threaded hole, and the lead wire of the acceleration sensor is connected to the outer ring of the electric brush At the connection point, the inner ring of the brush is fixed to the high-voltage rotor shaft by screws, and rotates synchronously with the high-voltage rotor shaft. The outer ring of the brush is fixed on the base 2 of the test bench by bolts, the leads of the outer ring of the brush are connected to the data acquisition board box 12, and the collected vibration signals are uploaded to the PC through the da...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 王奉涛张升华王贝崔立明陈旭涛张涛
Owner DALIAN UNIV OF TECH
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