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Device for evaluating sound insulation and absorption performance of automobile body part

A technology for evaluating devices and components, which is used in measurement devices, machine/structural component testing, and vehicle testing. The effect of sound insulation performance

Inactive Publication Date: 2012-07-11
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the NVH industry has many testing methods and software for testing the performance of acoustic materials, such as standing wave tubes, sound sources, BK software, etc. to test the sound absorption coefficient of materials, but the sampling area is small, and the sound insulation and absorption performance of materials cannot be subjectively felt
The combination of subjective and objective evaluation is a better way to evaluate the NVH performance of automobiles, but the analysis from objective test data alone is not comprehensive enough

Method used

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  • Device for evaluating sound insulation and absorption performance of automobile body part
  • Device for evaluating sound insulation and absorption performance of automobile body part
  • Device for evaluating sound insulation and absorption performance of automobile body part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: if figure 1 , figure 2 , image 3 As shown, a device for evaluating sound insulation and absorption performance of vehicle body components includes a pre-receiver 10, a computer testing system 9 connected to the output end of the pre-receiver, and a first computer test system connected to the input end of the pre-receiver 10. Microphone 8a, second microphone 8b, the device also includes a box, which is surrounded by four panels 1 on the top, bottom, front, and rear, a volume sound source 4 on the left, and a movable cover 2 on the right , and ensure that each surface is well sealed, an opening 2a is provided in the middle of the movable cover plate 2, and the vehicle body component to be tested is arranged in the opening 2a; the first microphone 8a is arranged on the panel 1 on the top surface, Its sound-receiving end extends into the box, and the second microphone 8b is arranged outside the box, and its sound-receiving end faces the movable cover pla...

Embodiment 2

[0016] Embodiment two, when testing the solid acoustic material alone, such as Figure 6 As shown, because the measured area of ​​the solid acoustic material is relatively large, the opening 2c on the solid movable cover is relatively large, and the remaining implementation methods and technical features are the same as those of the first embodiment above.

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Abstract

The invention discloses a device for evaluating sound insulation and absorption performance of an automobile body part. The device comprises a front receiver, a computer testing system, a first microphone, a second microphone, and a box body which is enclosed by four panels, a volume sound source and a movable cover plate; a hole is formed in the middle of the movable cover plate, and the automobile body part to be detected is arranged in the hole; and the first microphone is arranged on a panel, and the second microphone is arranged outside the box body. The movable cover plate can be detached from the box body or assembled on the box body; after the movable cover plate is detached, sound produced by the volume sound source can be heard outside the box body; and after the movable cover plate is assembled, the sound transmitted after the automobile body part on the movable cover plate absorbs the sound is heard, namely the sound insulation and absorption performance of the automobile body part is felt subjectively. Moreover, after the movable cover plate is assembled, the first microphone receives a sound signal in the box body, and the second microphone receives a sound signal outside the box body, namely the sound insulation and absorption performance of the automobile body part can be calculated, so the sound insulation and absorption performance of the automobile body part can be tested objectively.

Description

technical field [0001] The invention relates to the field of material acoustic performance testing, in particular to a sound insulation and absorption performance evaluation device for body parts. Background technique [0002] With the development of the automobile industry, consumers have higher and higher requirements for ride comfort, so the NVH (noise, vibration and harshness) performance of automobiles is also increasingly valued by major automobile companies. The correct use of automotive acoustic materials and panel materials is one of the effective methods to reduce noise and vibration in the car, and the sound insulation and absorption performance of acoustic materials and panel materials is an important indicator to ensure the realization of their functions. At present, the NVH industry has many testing methods and software for testing the performance of acoustic materials, such as standing wave tubes, sound sources, and BK software to test the sound absorption coe...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01M17/007
Inventor 张健夏张军孙义勇
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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