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Analysis method of vehicle sound insulation weak position based on sound transmission testing

An analysis method and sound transmission technology, which is applied to the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, measuring devices, and vehicle testing, and can solve problems such as the inability to quickly and accurately find weak locations of automobile sound insulation performance

Inactive Publication Date: 2020-04-17
CHINA AUTOMOTIVE ENG RES INST
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for analyzing the weak position of automobile sound insulation based on sound transmission test, so as to solve the problem that the weak position of automobile sound insulation performance cannot be quickly and accurately found in the prior art

Method used

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  • Analysis method of vehicle sound insulation weak position based on sound transmission testing
  • Analysis method of vehicle sound insulation weak position based on sound transmission testing
  • Analysis method of vehicle sound insulation weak position based on sound transmission testing

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Embodiment 1

[0027] Such as figure 1 Shown: When a certain model accelerates, there is obvious 500-600Hz engine noise in the car. According to experience, various sound insulation treatments have been tried on multiple parts of the body, and the noise inside the car has not been significantly improved. In this embodiment, the engine is the target sound source. So this method is used for testing and analysis.

[0028] A method for analyzing weak positions of car sound insulation based on sound transmission test, including the following steps:

[0029] Step A. Arrange a volume sound source in the area where the ears of the drivers and passengers are located in the vehicle body. In this embodiment, the volume sound source adopts the high and low frequency volume sound source system produced by Hengxin Dayou (Beijing) Technology Co., Ltd. The frequency range is 30~7000HZ;

[0030] Step B: According to the position of the target sound source, the position of the engine in this embodiment, the recei...

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Abstract

The invention belongs to the technical field of wheel type vehicle sound insulation performance testing, and particularly relates to an analysis method of a vehicle sound insulation weak position based on sound transmission testing, and the method comprises the following steps: step A, arranging a volume sound source in a frequency range of 30-20000HZ in an area where ears of a driver and passengers are located in a vehicle body; B, determining receiving points of all sound transmission paths outside the vehicle body according to the sound source position of the noise, and arranging receivingmicrophones at the receiving points; step C, taking the volume sound source as a reference, testing a sound transfer function ATF = Qa / p of a microphone from the interior of the vehicle to each receiving point, wherein Qa being the volume velocity of the sound source, and p being the sound pressure of the receiving point; and step D, calculating the sound insulation quantity of each receiving point according to the sound transfer function, comparing the sound insulation quantity of each receiving point according to the frequency range of the noise, and determining the receiving point with theminimum sound insulation quantity as the weak point of the sound insulation performance of the vehicle body according to a reciprocity method. According to the scheme, the problem that the weak position of the sound insulation performance of the vehicle cannot be quickly and accurately found in the prior art is solved.

Description

Technical field [0001] The invention belongs to the technical field of testing sound insulation performance of wheeled vehicles, and specifically is a method for analyzing weak positions of vehicle sound insulation based on sound transmission testing. Background technique [0002] The automotive market has become increasingly stringent on the performance of automotive NVH (Noise, Vibration, Harshness), and the impact of automotive sound insulation performance on the noise level in the vehicle is crucial. At present, there are mainly two test methods in the industry: the reverberation room method and the sound transmission method based on energy attenuation. The reverberation room method can evaluate the sound insulation capacity of the entire vehicle as a whole, but it cannot accurately evaluate the sound insulation performance from each sound source to the vehicle; based on the energy attenuation method, it can evaluate such as engine compartment, tires, and exhaust. Sound insu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/007G01N29/12
CPCG01M17/007G01N29/12
Inventor 夏铁权李沛然钟银辉蔡瑞姣
Owner CHINA AUTOMOTIVE ENG RES INST
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