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A Coherent Analysis Method for Correlation Characteristics of Low-Frequency Structural Vibration

A technology of structural vibration and analysis methods, which is applied in the testing of machines/structural components, vehicle testing, special data processing applications, etc.

Active Publication Date: 2022-04-22
HUNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the noise n(t) is not related to the input signal x(t), and the signal y(t) is the actual output, but it cannot be measured

Method used

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  • A Coherent Analysis Method for Correlation Characteristics of Low-Frequency Structural Vibration
  • A Coherent Analysis Method for Correlation Characteristics of Low-Frequency Structural Vibration
  • A Coherent Analysis Method for Correlation Characteristics of Low-Frequency Structural Vibration

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Embodiment 1

[0072] as attached figure 1 As shown, the present invention discloses a coherent analysis method for low-frequency structural vibration correlation characteristics adapting to steady-state and non-stationary noise, the steps of which are as follows:

[0073] (1) Preparation process for test coherence analysis: According to the panel structure of a certain car, divide the area and measuring points: Since the vibration of each panel structure is different, the more sheet metal areas are divided, the more accurate the positioning of vibration measuring points will be. However, the amount of calculation will be greater, so in order to avoid missing important signals during the test, three-way acceleration sensors are arranged reasonably and evenly on each board, as shown in Figure 3. When collecting structural vibration signals, the sensor should select the corresponding sensitivity. Finally, the installation and initialization of the LMS SCADAS data acquisition system are carrie...

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Abstract

The invention discloses a method for coherent analysis of low-frequency structure vibration correlation features. The steps are: (1) preparation process for test coherence analysis; (2) acquisition of panel structure vibration signals; (3) input and integration of structure vibration signals For the judgment of signal properties, the type of input signal is automatically judged according to the characteristics of the signal in the Matlab program; (4) The method of combining coherent analysis and sheet metal contribution is realized in the Matlab program. Carry out corresponding analysis according to the type of input signal self-adaptively, obtain partial correlation coefficient map and wavelet time-frequency coherence map; (5) Draw the coherence coefficient map according to the analysis result of step (4), determine the largest contribution to structural vibration and noise of boards. The present invention combines coherent analysis with sheet metal contribution, not only can accurately and effectively identify steady-state and non-stationary noise signals, but also adaptively adopts corresponding methods to sort and analyze sheet metal contribution, and determine the structure The panel structure that contributes the most to vibration and noise.

Description

Technical field: [0001] The invention mainly relates to the field of automobile low-frequency structural noise identification and correlation analysis technology, and specifically refers to a coherent analysis method for the correlation characteristics of low-frequency structural vibrations that adapt to steady-state and unsteady-state noises, which is mainly used for steady-state and unsteady-state Experimental analysis of vehicle panel structure vibration contribution to noise under working conditions. Background technique: [0002] With the rapid development of the automobile industry and the maturity of the automobile market, consumers are paying more and more attention to the ride comfort of vehicles. The noise level in the car is one of the main factors affecting the ride comfort. The medium and low frequency noise of the vehicle is mainly caused by the external excitation source acting on the interior of the vehicle through the structure transmission path, while the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F17/14G01M17/007G06F119/10
CPCG06F30/15G06F17/14G01M17/007G06F2119/10Y02T90/00
Inventor 谢小平陈永振周长江王续达吕顺娣
Owner HUNAN UNIV