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Method of testing and evaluating sound insulation property of finished automobile based on reverberation room

A reverberation chamber and performance technology, which is applied in vehicle testing, machine/structural component testing, and measurement of ultrasonic/sonic/infrasonic waves, etc., which can solve the problem of relatively few evaluation tests of vehicle sound insulation performance

Inactive Publication Date: 2013-05-22
CHONGQING CHANGAN AUTOMOBILE CO LTD
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AI Technical Summary

Problems solved by technology

A lot of research has been done at home and abroad on the test methods of sound insulation materials for automobiles and the sound insulation performance of automobile parts, and there are relatively few evaluation tests for the sound insulation performance of the whole vehicle

Method used

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  • Method of testing and evaluating sound insulation property of finished automobile based on reverberation room
  • Method of testing and evaluating sound insulation property of finished automobile based on reverberation room

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Embodiment Construction

[0013] see figure 1 The process of measuring the sound insulation performance of the whole vehicle in the reverberation chamber shown above, the test vehicle must be kept clean, and it needs to be checked for damage. Before carrying out the test, it is necessary to carry out an air tightness test on the whole vehicle to ensure that the airtightness of the test vehicle is at a normal level and there is no obvious leakage.

[0014] see figure 2 For the layout position of the whole vehicle shown, place the whole vehicle in the reverberation chamber to ensure that the whole vehicle is in the middle of the reverberation chamber, and the distance from the walls of the reverberation chamber is greater than 1.5m.

[0015] see figure 2 As shown in the layout of the sound source, the excitation sound source is placed in the reverberation room to ensure that the sound field in the reverberation room is uniform after the excitation sound source is sounded.

[0016] se...

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Abstract

The invention provides a method testing and evaluating sound insulation property of a finished automobile based on a reverberation room. Stimulating sound pressure sources are arranged at random multiple positions inside the reverberation room. Sound pressure testers are arranged at multiple positions inside the sealed finished automobile. A sound pressure mean square value outside an automobile body inside the reverberation room is calculated to obtain a stimulating sound pressure. A sound pressure mean square value inside the finished automobile is calculated to obtain a receiving sound pressure. A difference between the stimulating sound pressure and the receiving sound pressure is a sound decay. Thus the sound insulation property of the finished automobile is judged.

Description

technical field [0001] The invention relates to the technical field of vehicle NVH development, in particular to the test and evaluation of the sound insulation performance of the vehicle. Background technique [0002] With people's increasing emphasis on environmental protection and the requirements for the comfort of modern cars, the NVH performance of cars has become one of the most important indicators affecting a car brand. The sound insulation performance of the vehicle directly affects the transmission of airborne sound from the outside of the vehicle to the inside of the vehicle, which is directly related to the level of NVH of the vehicle. Therefore, the sound insulation performance of the vehicle is very important to the NVH performance of the vehicle. A lot of researches have been done at home and abroad on the test methods of sound insulation materials for automobiles and the sound insulation performance of automobile parts, but there are relatively few evaluat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G01M17/007
Inventor 刘宏玉万玉平章晓轩吴行让靳红英
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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