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A method for testing the sound insulation ability of vehicle body to engine noise

A capability test and engine technology, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, analyze materials, instruments, etc., can solve problems such as difficult implementation, unsupported target and database establishment, and inability to perform horizontal data comparison, etc., to improve simulation The effect of analytical precision

Active Publication Date: 2020-08-25
JIANGLING MOTORS
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AI Technical Summary

Problems solved by technology

The main traditional test method in China today is to place the sound source in the engine compartment and the microphone in the car. This method is not easy to implement. The disadvantages are: 1. The sound absorption coefficient of acoustic materials such as the cowl and engine compartment cover is not considered. 2. The project development In the process, it is not possible to perform horizontal data comparison and the establishment of targets and databases is not supported. 3. It is not possible to positively estimate the sound pressure level of the engine radiation noise transmitted to the car

Method used

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  • A method for testing the sound insulation ability of vehicle body to engine noise
  • A method for testing the sound insulation ability of vehicle body to engine noise
  • A method for testing the sound insulation ability of vehicle body to engine noise

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Embodiment

[0042] Example: see Figure 1 to Figure 6 .

[0043] A method for testing the sound insulation ability of a vehicle body to engine noise, the method steps are as follows:

[0044] Step 1: Test the sound attenuation from the engine to the interior of the vehicle

[0045] a. This test is carried out in the anechoic room, ensure that the anechoic room is clean and tidy, and there are no obstacles around the vehicle test;

[0046] b. For the installation of microphones, twelve microphones are arranged in the engine compartment, that is, two microphones are respectively arranged on the six sides of the engine compartment;

[0047] c. Sound source installation, place sound source 1 in the car;

[0048] d, hardware connection, including sound source 1, microphone 2, power amplifier 3, front-end signal collector system 4, post-processing system 5, microphone 2, post-processing system 5, power amplifier 3 are connected to front-end signal collection system 4 respectively, The sound...

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Abstract

The present invention relates to the field of automobile noise detection, in particular to a method for testing the sound insulation ability of the vehicle body to the engine noise. Calibration; the third step is data analysis and processing; the sound insulation performance of the engine compartment is tested and evaluated by using the method of simulating the sound source. The beneficial effect of the present invention is that: the sound source is arranged in the car, and the test can be carried out without removing the engine without any damage to the whole car; and the test results can also be used to verify the statistical energy model for simulation analysis and prediction, Improve the accuracy of simulation analysis; can positively estimate and introduce the sound pressure level of the engine radiation noise transmitted to the car; consider the sound absorption coefficient of acoustic materials such as the front wall and engine compartment cover; can carry out horizontal data comparison and support the target during the project development process Establish.

Description

technical field [0001] The invention relates to the field of automobile noise detection, in particular to a method for testing the sound insulation ability of a vehicle body against engine noise. Background technique [0002] Vehicle NVH is one of the important performances of vehicle development, including the control of sound source and the attenuation of transmission path. The attenuation capability of the transmission path is an important part of the NVH performance control of the whole vehicle; the noise of the engine and its accessories is the most important noise source, and one of the main functions of the engine compartment of the car is to isolate the external sound and convert the sound energy into heat energy through sound absorption , Reduce the noise inside the car. The main traditional test method in China today is to place the sound source in the engine compartment and the microphone in the car. This method is not easy to implement. The disadvantages are: 1....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/11
CPCG01N29/11G01N2291/015G01N2291/023
Inventor 杜莉陈清爽钟秤平成佐明段龙扬李亮张小红
Owner JIANGLING MOTORS
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