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No-rotation-speed-signal time domain synchronization averaging method for main reducer gearbox

A time-domain synchronous averaging, speed signal technology, applied in the field of mechanical condition monitoring and fault diagnosis, can solve problems such as limited application, inability to install time-scale signal sensors, etc., to achieve the effect of improving the signal-to-noise ratio

Inactive Publication Date: 2015-10-07
AVIC SHANGHAI AERONAUTICAL MEASUREMENT CONTROLLING RES INST
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Problems solved by technology

Due to structural reasons, the gearbox of the helicopter main reducer cannot be equipped with a time scale signal sensor (rotational speed sensor or optical encoder), which limits the application of the time domain synchronous averaging method in the state monitoring and fault diagnosis of the helicopter main reducer gear

Method used

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  • No-rotation-speed-signal time domain synchronization averaging method for main reducer gearbox
  • No-rotation-speed-signal time domain synchronization averaging method for main reducer gearbox
  • No-rotation-speed-signal time domain synchronization averaging method for main reducer gearbox

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Embodiment Construction

[0030] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] In order to effectively extract useful vibration features from the vibration signal of the gearbox of the main reducer of the helicopter, the present invention automatically selects the specific harmonic of the gear meshing frequency, and performs narrow-band demodulation on it, thereby estimating the angular position of the rotating shaft (which can be converted into a time scale ), and then segment and resample the original vibration signal according to the time scale of the rotating shaft rotation period, and finally reduce the vibration noise effectively through time-domain averaging, which provides a method for the fault feature extraction of the helicopter main reducer gearbox, and provides a method for subsequent state monitoring and fault diagnosis laid the foundation.

[0032] like figure 1 As shown, the present invention pr...

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Abstract

The invention discloses a no-rotation-speed-signal time domain synchronization averaging method for a main reducer gearbox. The method comprises the following steps: 1) carrying out Fourier transform on vibration signals of the main reducer gearbox to obtain a Fourier transform spectrogram; 2) carrying out detecting to obtain peak values of front three order gear engagement frequency harmonics according to the given approximate rotation speed and gear tooth numbers; 3) detecting local signal to noise ratio SNRk and cut-off order number Korder of the front five order engagement frequency harmonics, and selecting the engagement frequency harmonic, of which the cut-off order number is the highest, to carry out next-step processing; 4) carrying out narrow-band demodulation on the selected engagement frequency harmonic and calculating the angle position of a rotation shaft; and 5) according to the angle position of the rotation shaft, calculating rotation speed moment, segmenting the original vibration data according to the rotation period of the rotation shaft, and carrying out re-sampling on the data of each rotation period. The method can carry out time domain synchronization averaging automatically only with the given approximate rotation speed value and gear tooth numbers and without timing signals.

Description

technical field [0001] The invention belongs to the technical field of mechanical state monitoring and fault diagnosis, and relates to a time-domain synchronous averaging method for a non-rotational speed signal, in particular to a time-domain synchronous averaging method for a non-rotational speed signal for a gearbox of a helicopter main reducer. Background technique [0002] As the key component of the helicopter transmission system, the main reducer gearbox has a complex structure, and it has been in the harsh environment of high speed and alternating heavy load for a long time. Because of its non-redundant design, it is prone to failure and damage, and its health status is directly related to the helicopter. flight safety. Therefore, in order to improve the safety of helicopter operation and prevent accidents, it is necessary to carry out condition monitoring and fault diagnosis of the gearbox. [0003] Extracting effective fault features is the premise of gearbox faul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/02
Inventor 唐林牧沈勇郑国王景霖何召华单添敏林泽力
Owner AVIC SHANGHAI AERONAUTICAL MEASUREMENT CONTROLLING RES INST
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