Paraboloidal acoustic mirror array collection device used for wayside acoustic detection of train bearings

An acquisition device and parabolic surface technology, which is applied in the field of parabolic acoustic mirror array acquisition devices, can solve problems such as Doppler distortion of sound signals, and achieve the effects of increasing signal-to-noise ratio, improving signal-to-noise ratio, and increasing intensity

Active Publication Date: 2018-11-13
ANHUI UNIVERSITY
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  • Abstract
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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:

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  • Paraboloidal acoustic mirror array collection device used for wayside acoustic detection of train bearings
  • Paraboloidal acoustic mirror array collection device used for wayside acoustic detection of train bearings
  • Paraboloidal acoustic mirror array collection device used for wayside acoustic detection of train bearings

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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 invention provides a paraboloidal acoustic mirror array collection device used for wayside acoustic detection of train bearings. The paraboloidal acoustic mirror array collection device comprisesa plurality of same acoustic mirror units which are arranged along rails horizontally, straightly and uniformly, each of the acoustic mirror units comprises a microphone, an acoustic reflector and a support, reflection surfaces of acoustic mirrors are paraboloids, curves of horizontal cross-sections of the reflection surfaces of the acoustic mirrors are parabolas, and the microphones are respectively placed at focal positions of the acoustic mirror paraboloids. The paraboloidal acoustic mirror array collection device has the advantages that in principle, the acoustic mirrors can avoid dopplerdistortion and can eliminate noise directionally, by arranging the acoustic mirrors in an array mode, length of a collected signal can be increased, and accuracy in train bearing fault diagnosis can be improved effectively.

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 Applications(China)
IPC IPC(8): G01M13/04G01H17/00
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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