Method of identifying non-stationary abnormal noise source in automobile

A technology of abnormal noise and identification method, applied in the fields of vibration, sound and vibration comfort, and automobile noise, it can solve the problem that non-stationary noise sources cannot be directly identified, and achieve the effect of eliminating mutual influence.

Active Publication Date: 2016-10-26
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0011] The purpose of the present invention is to solve the problem that the traditional time-frequency identification method under the complex sound field in the vehicle fails to effective...

Method used

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  • Method of identifying non-stationary abnormal noise source in automobile
  • Method of identifying non-stationary abnormal noise source in automobile
  • Method of identifying non-stationary abnormal noise source in automobile

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Embodiment Construction

[0037] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0038] The invention provides a method for identifying non-stationary abnormal noise sources in automobiles, such as figure 1 shown, including the following steps:

[0039] S1. Subjectively evaluate the noise source in the vehicle.

[0040] Since there are too many sound sources in the car, in order to improve efficiency and carry out targeted sound source identification, the sensor layout range can be narrowed initially by subjective evaluation methods. However, the recognition accuracy of the subjective evaluation method is low, and it can only provide directions for later experimental tests.

[0041] S2. Arranging sensors in the vehicle.

[0042]The sound source of the car comes from two aspects: airborne noise and structural vibration noise. For the sound source of airborne noise, the microphone can be placed close to the surface of the sound sour...

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Abstract

The invention discloses a method of identifying a non-stationary abnormal noise source in an automobile, which not only analyzes signal amplitude information, but also effectively utilizes phase information among signals. The method calculates an instantaneous partial coherence function among signals so as to eliminate mutual influence among automobile sound source signals; and based on this, the method combines the instantaneous partial coherence function with phase information to form an instantaneous partial coherence relation spectrum to rapidly and directly identify a noise source in an automobile. The method is suitable for stationary, non-stationary and instantaneous signal noise source identification analysis.

Description

technical field [0001] The invention belongs to the technical field of automobile noise, vibration and acoustic vibration comfort, and in particular relates to the design of a method for identifying non-stationary abnormal noise sources in automobiles. Background technique [0002] With the continuous enhancement of people's environmental awareness, the problem of automobile noise has been widely concerned by the society. In this context, automotive noise, vibration and Harshness (NVH) is evolving into an important product design and performance evaluation index, and also one of the car performance indicators that consumers or users are most concerned about. It even directly affects the brand of the car. Therefore, the level of vehicle noise control, especially the level of interior noise control, has been used as an important parameter to evaluate the quality of vehicle models. [0003] In-vehicle noise control begins with noise source identification, that is, whether the...

Claims

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Application Information

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IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 黄海波丁渭平杨明亮朱洪林姜东明马逸飞
Owner SOUTHWEST JIAOTONG UNIV
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