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Weight analysis method for noise source of engine

A technology of weight analysis and engine, applied in computer-aided design, measurement of ultrasonic/sonic/infrasonic, special data processing applications, etc., can solve the lack of consistency inspection standards, the small role of noise source identification, and the difficulty of ensuring the consistency of the coordination judgment matrix and other issues to achieve a more scientific effect in calculating the contribution weight

Inactive Publication Date: 2018-09-11
TIANJIN UNIV
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Problems solved by technology

For correlated MISO systems, constant coherence analysis is less useful for identifying noise sources
Although the AHP can be used to calculate the noise weights of noise sources in different frequency bands, different measuring points, and different working conditions, the traditional AHP has the disadvantages that the consistency of the coordination judgment matrix is ​​difficult to guarantee and the consistency inspection standard lacks sufficient scientific basis. limit

Method used

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  • Weight analysis method for noise source of engine
  • Weight analysis method for noise source of engine
  • Weight analysis method for noise source of engine

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] The invention protects an engine noise source weight analysis method, comprising the following steps:

[0027] (1) Acquisition of vibration and noise signals: refer to GB / T 1859-2000 Engineering Method and Simple Method for Measuring Radiated Air Noise of Reciprocating Internal Combustion Engines. Test the vibration and noise signals of diesel engines under different working conditions.

[0028] (2) VMD decomposition of the noise signal: VMD decomposition is performed on the noise signal to obtain IMFs of different frequency bands. And the decomposed IMF is subjected to wavelet transformation to obtain decomposed signals of different frequency band noises. VMD is a decomposition mode that transforms the signal to be decomposed into non-recursive and variational modes, which solves the mode mixing and mode splitting problems of EEMD to a certain extent. The IM...

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Abstract

The invention discloses a weight analysis method for a noise source of an engine. The method comprises the steps that vibration and noise data of the engine under multiple working conditions is tested, a variational modal decomposition (VMD) algorithm is used for conducting self-adaption decomposition on noise signals, original noise signals are decomposed into multiple IMFs at different frequencybands, vibration of different structures and the IMFs at different frequency bands are used for partial correlation analysis, and an improved fuzzy analytic hierarchy process is used for calculatingcontribution weights of different structures to engine noise at different frequency bands, different testing points and different working conditions.

Description

technical field [0001] The invention relates to the field of engine NVH, in particular to an engine noise source weight analysis method. Background technique [0002] At present, national and industry regulations have increasingly stringent requirements on vehicle noise, and consumers' requirements on vehicle noise level and quality are also constantly increasing. As one of the main noise sources of vehicles, the noise performance of the engine has become its main performance index as well as power, economy and reliability. To reduce the noise of the engine, it is necessary to grasp the characteristics of its noise source, so as to control the main noise source. The structure of the engine is complex, and the noise sources are numerous and interact with each other. How to accurately identify the main noise sources of the engine is the focus of research. Commonly used engine noise source identification methods include lead coverage method, coherence analysis method, sound i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01H17/00
CPCG01H17/00G06F30/20G06F2119/10
Inventor 张俊红周启迪林杰威李伟东
Owner TIANJIN UNIV
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