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Predicating method and device for in-vehicle acoustic modal shape

A prediction method and a technology of a prediction device, which are applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as high cost of use, influence of test results, and low test efficiency, so as to save costs, improve accuracy and The effect of testing efficiency

Inactive Publication Date: 2013-04-03
BYD CO LTD
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Problems solved by technology

[0003] However, a large number of microphones arranged in the car will cause great interference to the sound field in the car, especially the sound scattering effect of the microphone mounting bracket structure and microphone connecting wires, which seriously interferes with the sound field distribution in the car and has a great impact on the final test results. This is one of the most important sources of error in the measurement of vehicle interior acoustic modes by the traditional single-point excitation and multi-point response method
At the same time, this method has high cost and low test efficiency

Method used

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  • Predicating method and device for in-vehicle acoustic modal shape
  • Predicating method and device for in-vehicle acoustic modal shape
  • Predicating method and device for in-vehicle acoustic modal shape

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Embodiment Construction

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "first", "second" and so on are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be mechanical co...

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Abstract

The invention provides a predicating method and device for an in-vehicle acoustic modal shape. The predicating method for the in-vehicle acoustic modal shape comprises the following steps of: S1, determining in-vehicle acoustic modal shape frequency; S2, acquiring holographic complex sound pressure based on the in-vehicle acoustic modal shape frequency; S3, calculating imaginary source strength according to the holographic complex sound pressure; and S4, obtaining the in-vehicle acoustic pressure distribution through statistics based on a superposition principle of wave to obtain the in-vehicle acoustic modal shape. According to the predicating method for the in-vehicle acoustic modal shape provided by the embodiment of the invention, the cost is reduced; and the predicating efficiency and accuracy are improved.

Description

technical field [0001] The invention relates to the field of vehicle interior noise and vibration control, in particular to a method and device for predicting the acoustic mode shape of an interior vehicle. Background technique [0002] Accurately obtaining the interior acoustic mode distribution is an important part of interior acoustics analysis and optimization. Usually, the method of single-point excitation and multi-point response is used to determine the acoustic mode of the interior acoustic cavity by measuring the excitation signal and response signal to obtain the frequency response function. state parameters. During the test, the signal generator generates random signals, and after passing through the power amplifier, the sound source stimulates the pressure fluctuation of the sound cavity in the car. 3 Several microphones are arranged at intervals to pick up the sound signal, and the frequency of the acoustic mode and the distribution of the mode shape are determ...

Claims

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Application Information

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IPC IPC(8): G01H17/00
Inventor 王岩祁宏钟陈晓新潘蕾王国庆刘勇
Owner BYD CO LTD
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