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A parabolic acoustic mirror array acquisition device for acoustic detection of train bearing rails

A collection device and parabolic surface technology, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, testing of mechanical components, etc., can solve problems such as Doppler distortion of sound signals, increase signal-to-noise ratio and overcome Doppler distortion problem, the effect of improving accuracy

Active Publication Date: 2020-01-03
ANHUI UNIVERSITY
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Problems solved by technology

[0004] The technical problem to be solved in the present invention is: the Doppler distortion and the strong noise problem of train bearing sound signal, specifically set forth as follows:

Method used

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  • A parabolic acoustic mirror array acquisition device for acoustic detection of train bearing rails
  • A parabolic acoustic mirror array acquisition device for acoustic detection of train bearing rails
  • A parabolic acoustic mirror array acquisition device for acoustic detection of train bearing rails

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Embodiment Construction

[0029] The present invention is a parabolic acoustic mirror array collection device for acoustic detection of train bearing rails, comprising several identical acoustic mirror units, wherein each acoustic mirror unit includes: a microphone, an acoustic mirror, and a support frame.

[0030] Wherein, the microphone is placed at a corresponding position of the support frame for receiving sound signals; the acoustic mirror is installed at a corresponding position of the support frame for reflecting and converging sound signals.

[0031] An acoustic signal acquisition method using a parabolic acoustic mirror to avoid Doppler distortion at the side of the train bearing rail utilizes the property of the parabola, that is, the distance from any point on the parabola to the focal point is equal to the distance to the directrix.

[0032] The following is a detailed explanation of the principle: figure 2 As shown, consider the process of the sound source A moving from point M to point N...

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Abstract

The present invention proposes a parabolic acoustic mirror array acquisition device for the acoustic detection of the train bearing rail edge, which is composed of several identical acoustic mirror units, and the acoustic mirror units are evenly arranged horizontally and straightly along the rail direction, and each acoustic mirror unit includes a microphone , an acoustic reflector, and a support frame, wherein the reflective surface of the acoustic mirror is in the shape of a parabola, and the horizontal section curve of the reflective surface of the acoustic mirror is a parabola, and the microphone is placed at the focal point of the paraboloid of the acoustic mirror. The acoustic mirror in the array acquisition device proposed by the present invention can avoid Doppler distortion in principle, and has the function of directional noise elimination. At the same time, the array form can extend the length of the acquisition signal, and effectively improve the accuracy of train bearing fault diagnosis.

Description

technical field [0001] The invention relates to the field of equipment state monitoring and fault diagnosis, in particular to a parabolic acoustic mirror array acquisition device used for acoustic detection of train bearing rails. Background technique [0002] As a key component of the train, the wheel set bearings are in high-speed, heavy-duty working conditions for a long time, and the contact stress on the surface of each component acts repeatedly, which can easily cause problems such as fatigue, cracks, indentations, breakage, adhesion, wear, etc., which will cause vibration Problems such as increase, noise and rotational resistance, etc., will seriously cause the entire axle system to fail, and even cause major safety accidents. Therefore, it is necessary to carry out online detection of the state of the train wheel bearings. [0003] Trackside acoustic detection technology is one of the effective means for trackside acoustic detection of train wheel-set bearings. The m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/045G01H17/00
CPCG01H17/00G01M13/045
Inventor 刘方殷敏黄海东陈婧吴瑞祥刘永斌陆思良琚斌
Owner ANHUI UNIVERSITY
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