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Prediction apparatus for sound absorption and insulation performance of multilayer material and method

A multi-layer material and performance prediction technology, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, can solve the problems that impedance tubes cannot test the sound absorption and insulation performance of multi-layer composite materials, and achieve easy implementation, convenient operation, and test accuracy high effect

Inactive Publication Date: 2015-04-22
BRILLIANCE AUTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-layer material sound absorption and insulation performance prediction device and method, which solves the problem that the impedance tube cannot test the sound absorption and insulation performance of thick, multi-layer composite materials, and its test accuracy is high, easy to implement, easy to operate

Method used

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  • Prediction apparatus for sound absorption and insulation performance of multilayer material and method
  • Prediction apparatus for sound absorption and insulation performance of multilayer material and method
  • Prediction apparatus for sound absorption and insulation performance of multilayer material and method

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Embodiment 1

[0024] The device for predicting the sound absorption and insulation performance of multi-layer materials in this embodiment, such as figure 1 shown. It includes an impedance tube 1 with built-in single-layer material to be tested, a microphone group 2, a power amplifier 3, a data acquisition device 4, a computer 5 and a loudspeaker 6. One end of the microphone group 2 is inserted on the upper surface of the impedance tube 1, and the sensors in the microphone group 1 are evenly distributed on both sides of the single-layer material to be tested, and the output end of the microphone group 2 is connected to the input end of the power amplifier 3, the power amplifier The output end of 3 is connected to the input end of the data acquisition device 4, the output end of the data acquisition device 4 is connected to the input end of the computer 5, the output end of the computer 5 is connected to the input end of the loudspeaker 6, and the output end of the loudspeaker 6 outputs whit...

Embodiment 2

[0034] The difference between the multi-layer material sound absorption and insulation performance prediction device in this embodiment and embodiment 1 is that the inner end of the impedance tube 1 is also provided with a sound-absorbing material filler 7, which is used to reduce the influence of the secondary reflected wave D, such as figure 2 shown.

Embodiment 3

[0036] The difference between the device for predicting sound absorption and insulation performance of multi-layer materials in this embodiment and Embodiment 1 is that, in addition to performing amplitude calibration on each microphone, phase calibration should also be performed on each microphone, so that microphones 201 to 204 are at the same time The lag angle is equal to 0, so that they are synchronized in time, so that the sound pressure signal collected by the microphone is more accurate, so as to eliminate the measurement error to the greatest extent.

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Abstract

A prediction apparatus for sound absorption and insulation performance of a multilayer material and a method are disclosed and relate to the field of testing of sound absorption and insulation performance of materials. The apparatus comprises an impedance tube with a built-in to-be tested single-layer material, a microphone group, a power amplifier, a data acquisition device, a computer and a loudspeaker. The method comprises: firstly testing the sound absorption and insulation performance of a single-layer material; testing the transfer function matrixes of other single-layer materials, and storing in a database; and utilizing the transfer function matrixes of the single-layer materials to calculate the sound absorption and insulation performance of the multi-layer material. According to the technical scheme, a four pole network theory is firstly utilized for testing the transfer function of the single-layer materials, and then the transfer function matrixes of the single-layer materials are utilized for directly obtaining the sound absorption coefficient and the transmission loss of the multi-layer material. The method is easy to realize and convenient to operate, also is high in testing precision, makes up insufficiency of impedance tube testing, and is widely applicable to noise optimization control of multiple fields.

Description

technical field [0001] The invention relates to the field of testing the sound absorption and insulation performance of materials, in particular to a device and method for predicting the sound absorption and insulation performance of multilayer materials. Background technique [0002] With the development of society and the improvement of living standards, people have more and more strict requirements on the noise of vehicles, household appliances and living environment. As the most effective means of controlling medium and high frequency noise, sound-absorbing and insulating materials have always played an important role in the fields of automotive acoustic packaging, architectural acoustics, and home appliance noise control. Compared with single-layer materials, multi-layer materials have better acoustic performance, so they are used more and more. [0003] The performance testing methods of acoustic materials mainly include the reverberation chamber method and the impeda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/11
Inventor 徐勇王晖王洋王楷焱赖征海李冬梅
Owner BRILLIANCE AUTO
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