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A method and system for testing the modal frequency of an open acoustic cavity

A technology of modal frequency and test method, applied in the field of vehicle calculation, to achieve the effect of high test accuracy

Active Publication Date: 2020-08-18
ZHEJIANG GEELY HLDG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to propose a method and system for testing the modal frequency of an open acoustic cavity, aiming at solving the problem of calculating the modal frequency of an open acoustic cavity

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  • A method and system for testing the modal frequency of an open acoustic cavity
  • A method and system for testing the modal frequency of an open acoustic cavity
  • A method and system for testing the modal frequency of an open acoustic cavity

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Embodiment Construction

[0054] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0055] Implementations of various embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description, use of suffixes such as 'module', 'part' or 'unit' for denoting elements is only for facilitating description of the present invention and has no specific meaning by itself.

[0056] Such as figure 1 As shown, the first embodiment of the present invention proposes a method for testing the modal frequency of an open acoustic cavity, the method comprising steps:

[0057] S1: determine the number of virtual sound sources of the open acoustic cavity;

[0058] The number of virtual sound sources determines the computational efficiency and accuracy of the virtual sound source method. In the process of applying the virtual sound source method, a computatio...

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Abstract

The invention discloses a testing method and system for the mode frequency of an opening cavity, and the method comprises the steps: determining the number of virtual sound sources of the opening cavity; calculating the time domain response of any point in the opening cavity through a virtual sound source method; carrying out the Fourier transformation of the time domain response, and obtaining afrequency response function; setting the peak value of the frequency response function as the frequency of the mode of the opening cavity. The method and system can achieve the testing of the mode ofthe an in-vehicle sound cavity when a window of the vehicle is opened, provide a technical reference for the in-vehicle noise control, can be used for the testing and analysis of the power of tyre noise of different types of vehicles, are high in testing precision, and are quick and accurate.

Description

technical field [0001] The invention relates to the field of vehicle computing, in particular to a test and method system for the modal frequency of an open acoustic cavity. Background technique [0002] The acoustic problems of closed and open acoustic cavities are common and very important in engineering. The modal frequencies of closed acoustic cavities can be solved directly by theoretical or empirical formulas, while the acoustic performance of open acoustic cavities is more complicated and cannot be effectively tested. or forecast. [0003] Open-type acoustic cavity is commonly found in life and engineering, such as musical instruments such as flute and guitar, and when the side window or sunroof of a car is opened. Studies have shown that the pressure pulsation on the opening surface of the acoustic cavity and the standing wave effect in the acoustic cavity can cause the resonance noise of the acoustic cavity to reach 170dB. of vortex. Another study shows that at l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R29/00
CPCH04R29/00H04R2430/03
Inventor 毛杰朱凌
Owner ZHEJIANG GEELY HLDG GRP CO LTD