A method and system for rapid identification of in-vehicle acoustic cavity modes

By using multi-point excitation and acoustic transfer function analysis within the vehicle, combined with preset conditions, the in-vehicle acoustic cavity modes are identified, solving the problems of time-consuming, labor-intensive, and error-prone methods in existing methods, and achieving simple and efficient acoustic cavity mode identification.

CN115221600BActive Publication Date: 2026-06-19GUANGZHOU AUTOMOBILE GROUP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGZHOU AUTOMOBILE GROUP CO LTD
Filing Date
2021-06-02
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing in-vehicle acoustic cavity modal recognition methods require complex acoustic cavity models and a large number of microphones, resulting in time-consuming and labor-intensive processes, difficulty in ensuring uniform excitation of the in-vehicle sound field, large recognition errors, and high dependence on engineering experience.

Method used

Multiple low-frequency monopole excitation sources are used to excite multiple designated areas inside the vehicle. Combined with the microphone settings in the acoustic cavity slice area, the acoustic cavity modal frequencies and vibration modes are identified through acoustic transfer function analysis, and the acoustic cavity modal types are output based on preset conditions.

Benefits of technology

It achieves uniform excitation of the in-vehicle sound field, reduces the use of microphones, simplifies the experimental process, improves the accuracy and efficiency of recognition, and reduces errors.

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Abstract

This invention provides a method for rapid identification of acoustic cavity modes within a vehicle. The method includes receiving response signals generated by various microphones when subjected to multi-point excitation from multiple excitation sources within the vehicle. These multiple excitation sources are positioned in designated areas within the vehicle, ensuring uniform excitation of the acoustic field during multi-point excitation. Each microphone is positioned in a specific acoustic cavity slice within the vehicle, with each slice corresponding to a designated area. Based on the received response signals, acoustic transfer function analysis is performed to obtain the acoustic cavity modal frequencies and their corresponding fitted sound field modes for each slice. Combining these with preset conditions for multiple acoustic cavity mode types, the corresponding acoustic cavity mode type is output. Implementing this invention avoids the cumbersome problems associated with complex acoustic cavity models and numerous microphones, ensures uniform excitation of the acoustic field within the vehicle, and significantly reduces judgment errors, resulting in simpler and more accurate identification.
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