US-12625029-B2 - Abnormal noise reproduction device and abnormal noise reproduction method thereof

US12625029B2US 12625029 B2US12625029 B2US 12625029B2US-12625029-B2

Abstract

An abnormal noise reproduction device and an abnormal noise reproduction method thereof are provided in the disclosure. The abnormal noise reproduction device includes at least one measuring device, an analysis device, and a vibration device. The at least one measuring device includes a contact microphone and an accelerometer. The contact microphone is disposed on the abnormal noise generating part of a vehicle, senses vibration sound of the abnormal noise generating part, and generates a vibration sound signal. An acceleration signal is generated by synchronously sensing acceleration of the contact microphone over a time sequence through the accelerometer. The analysis device determines when the abnormal noise generating part produces abnormal noise according to the vibration sound signal. The vibration device applies vibration to the vehicle and reproduces the acceleration signal corresponding to the abnormal noise.

Inventors

Susumu Akutsu
Katsuji TAMAZAWA
Naoyuki OTSUKA
Masayuki Hashimoto
Toshiyuki Ohtsuka
Mikiyasu HAYASHI
Shogo Iguchi

Assignees

HONDA MOTOR CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20240221
Priority Date: 20230308

Claims (12)

1 . An abnormal noise reproduction device, comprising: at least one measuring device, comprising: a contact microphone, disposed on an abnormal noise generating part of a vehicle, sensing vibration sound of the abnormal noise generating part and generating a vibration sound signal; and an accelerometer, coupled to the contact microphone, synchronously sensing acceleration of the contact microphone over a time sequence and generating an acceleration signal; a processor, determining when the abnormal noise generating part produces abnormal noise according to the vibration sound signal; and a vibration device comprising a fixing rod and a vibration rod configured to clamp a tire of the vehicle to apply vibration to the vehicle and reproducing the acceleration signal corresponding to the abnormal noise.
2 . The abnormal noise reproduction device according to claim 1 , wherein the processor divides the acceleration signal in units of first prescribed periods, and performs fast Fourier transform (FFT) analysis on the acceleration signal in each of the first prescribed periods to extract the acceleration signal corresponding to the abnormal noise.
3 . The abnormal noise reproduction device according to claim 2 , wherein the processor divides the vibration sound signal in units of second prescribed periods, and performs fast Fourier transform analysis on the vibration sound signal in each of the second prescribed periods to determine generation time of the abnormal noise, wherein the second prescribed period is equal to or shorter than the first prescribed period.
4 . The abnormal noise reproduction device according to claim 1 , wherein the processor determines characteristics of vibration corresponding to the abnormal noise according to the vibration sound signal and the acceleration signal.
5 . The abnormal noise reproduction device according to claim 1 , comprising: a first measuring device, comprising: a first contact microphone, disposed on the abnormal noise generating part, sensing vibration sound of the abnormal noise generating part and generating a first vibration sound signal; and a first accelerometer, synchronously sensing acceleration of the first contact microphone over a time sequence and generating a first acceleration signal; a second measuring device, comprising: a second contact microphone, disposed on the abnormal noise generating part, sensing vibration sound of the abnormal noise generating part and generating a second vibration sound signal; and a second accelerometer, synchronously sensing acceleration of the second contact microphone over a time sequence and generating a second acceleration signal, wherein the processor determines a sound pressure difference between the first contact microphone and the second contact microphone according to the first vibration sound signal and the second vibration sound signal, and determines an abnormal noise source position of the abnormal noise generating part according to the sound pressure difference.
6 . The abnormal noise reproduction device according to claim 5 , wherein the processor determines characteristics of vibration corresponding to the abnormal noise according to the first vibration sound signal, the first acceleration signal, the second vibration sound signal, and the second acceleration signal.
7 . An abnormal noise reproduction method of an abnormal noise reproduction device, wherein the abnormal noise reproduction device comprises at least one measuring device, the at least one measuring device comprises a contact microphone and an accelerometer, the contact microphone is coupled to the accelerometer, the contact microphone is disposed on an abnormal noise generating part of a vehicle, the abnormal noise reproduction method comprises: generating a vibration sound signal by sensing vibration sound of the abnormal noise generating part by using the contact microphone; generating an acceleration signal by synchronously sensing acceleration of the contact microphone over a time sequence by using the accelerometer; determining when the abnormal noise generating part produces abnormal noise according to the vibration sound signal; applying vibration to the vehicle and reproducing the acceleration signal corresponding to the abnormal noise.
8 . The abnormal noise reproduction method of the abnormal noise reproduction device according to claim 7 , comprising: dividing the acceleration signal in units of first prescribed periods, and performing fast Fourier transform analysis on the acceleration signal in each of the first prescribed periods to extract the acceleration signal corresponding to the abnormal noise.
9 . The abnormal noise reproduction method of the abnormal noise reproduction device according to claim 8 , comprising: dividing the vibration sound signal in units of second prescribed periods, and performing fast Fourier transform analysis on the vibration sound signal in each of the second prescribed periods to determine generation time of the abnormal noise, wherein the second prescribed period is equal to or shorter than the first prescribed period.
10 . The abnormal noise reproduction method of the abnormal noise reproduction device according to claim 7 , comprising: determining characteristics of vibration corresponding to the abnormal noise according to the vibration sound signal and the acceleration signal.
11 . The abnormal noise reproduction method of the abnormal noise reproduction device according to claim 7 , wherein the abnormal noise reproduction device comprises a first measuring device and a second measuring device, the first measuring device comprises a first contact microphone and a first accelerometer, the second measuring device comprises a second contact microphone and a second accelerometer, the first contact microphone and the second contact microphone are disposed on the abnormal noise generating part, the abnormal noise reproduction method comprises: generating a first vibration sound signal and a second vibration sound signal by sensing vibration sound of the abnormal noise generating part by using the first contact microphone and the second contact microphone; generating a first acceleration signal and a second acceleration signal by synchronously sensing acceleration of the first contact microphone and the second contact microphone over a time sequence by using the first accelerometer and the second accelerometer; and determining a sound pressure difference between the first contact microphone and the second contact microphone according to the first vibration sound signal and the second vibration sound signal, and determining an abnormal noise source position of the abnormal noise generating part according to the sound pressure difference.
12 . The abnormal noise reproduction method of the abnormal noise reproduction device according to claim 11 , comprising: determining characteristics of vibration corresponding to the abnormal noise according to the first vibration sound signal, the first acceleration signal, the second vibration sound signal, and the second acceleration signal.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefit of China application serial no. 202310217316.5 filed on Mar. 8, 2023. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. BACKGROUND Technical Field The disclosure relates to an abnormal noise reproduction device and an abnormal noise reproduction method thereof, and in particular relates to an abnormal noise reproduction device that may accurately measure abnormal noise and reproduce the abnormal noise, and an abnormal noise reproduction method thereof. Description of Related Art During vehicle operation, the various parts of the vehicle experience vibrations due to the unevenness of the road surface. Some parts may generate abnormal noise due to collision with adjacent parts during vibration. Generally, users may only confirm the position of abnormal noise through the sound heard by their ears. However, this method may be compromised due to the attenuation and interference of sound waves as they propagate through the air, making it difficult to identify the source of the vibrations causing the abnormal noise, and thus challenging to implement effective strategies to resolve the issue of abnormal noise. SUMMARY An abnormal noise reproduction device and an abnormal noise reproduction method thereof, which may effectively detect vibrations causing abnormal noise, stably reproduce abnormal sounds, and may easily determine the cause of abnormal noise, are provided in the disclosure, to facilitate users to take effective countermeasures to solve the problem of abnormal noise. The abnormal noise reproduction device of the disclosure includes at least one measuring device, an analysis device, and a vibration device. The at least one measuring device includes a contact microphone and an accelerometer. The contact microphone is disposed on the abnormal noise generating part of a vehicle, senses vibration sound of the abnormal noise generating part, and generates a vibration sound signal. An acceleration signal is generated by synchronously sensing acceleration of the contact microphone over a time sequence. The analysis device determines when the abnormal noise generating part produces abnormal noise according to the vibration sound signal. The vibration device applies vibration to the vehicle and reproduces the acceleration signal corresponding to the abnormal noise. An abnormal noise reproduction method of an abnormal noise reproduction device is also provided in the disclosure. The abnormal noise reproduction device includes at least one measuring device. The at least one measuring device includes a contact microphone and an accelerometer. The contact microphone is disposed on the abnormal noise generating part of a vehicle. The abnormal noise reproduction method includes the following operation. Vibration sound signal is generated by sensing vibration sound of an abnormal noise generating part by using the contact microphone. An acceleration signal is generated by synchronously sensing acceleration of the contact microphone over a time sequence by using the accelerometer. When the abnormal noise generating part produces abnormal noise is determined according to the vibration sound signal. Vibration is applied to the vehicle and the acceleration signal is reproduced corresponding to the abnormal noise. Based on the above, in the embodiments of the disclosure, a vibration sound signal may be generated by sensing vibration sound by using a contact microphone, an acceleration signal may be generated by synchronously sensing the acceleration of the contact microphone by using an accelerometer, abnormal noise is detected by using the vibration sound signal and the acceleration signal, and the abnormal noise may be reproduced by applying vibration to the vehicle and reproducing the acceleration signal corresponding to the abnormal noise. In this way, the use of contact microphones and accelerometers to detect abnormal noise may prevent the accuracy of the detection results from being reduced due to sound wave attenuation or interference, and thereby the vibration causing the abnormal noise may be correctly determined. In addition, abnormal noise may be reproduced continuously by using a vibration device to reproduce the vibration (acceleration signal) of abnormal noise, facilitating users to share and analyze abnormal noise information, and take effective countermeasures to solve the problem of abnormal noise. In order to make the above-mentioned features and advantages of the disclosure comprehensible, embodiments accompanied with drawings are described in detail below. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an abnormal noise reproduction device according to an embodiment of the disclosure. FIG. 2 is a schematic diagram of abnormal noise generated by a vehicle according to an embodiment of the disclosure. FIG. 3 is a wavefo