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Composite material vibration and noise reduction tester and method based on reverberation plane acoustic wave excitation

A planar acoustic wave, vibration reduction and noise reduction technology, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, material analysis, and use of sound waves/ultrasonic waves/infrasonic waves to analyze solids. Application of engineering site and other issues to achieve the effect of reducing costs and testing indicators comprehensively

Active Publication Date: 2021-06-04
NORTHEASTERN UNIV LIAONING
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AI Technical Summary

Problems solved by technology

In terms of noise characteristics testing, the test system developed by patent CN109405952 A considers the sound insulation design of the cabinet, but does not do sound absorption design to reduce the echo effect of the inner wall
The test platform designed by patent CN104914160A can measure the sound absorption and sound insulation characteristics of noise reduction materials, but it is still lacking in portability and vibration characteristics testing
Similarly, the noise test system proposed by the patent CN107132428 A is too large to be applied to the engineering site, so it needs to be improved in terms of miniaturization
[0004] The performance of vibration reduction and noise reduction is tested separately, resulting in low test efficiency, and due to the adjustment of installation boundary conditions and test sites, it is easy to cause changes in the inherent characteristic parameters of the tested sample, which seriously affects the accuracy of the test
However, most of the test instruments currently on the market do not consider the various forms of noise excitation, and only test a certain performance of the material. If you need to know the vibration and noise reduction performance of the material, you need to spend a lot of manpower. and material resources to build the experimental system, which will lead to the large size and high cost of the test system and test instruments used, which are not suitable for engineering site use, and lack a set of effective test methods that can efficiently, quickly and accurately Obtaining the Vibration and Noise Reduction Properties of Composite Materials
The lack of the above-mentioned testing instruments and testing methods has seriously affected the objective judgment of the scientific and technological personnel of my country's military R&D units on the vibration and noise reduction performance of high-performance composite materials, and seriously restricted the development of my country's new generation of air force and navy weapons and equipment.

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  • Composite material vibration and noise reduction tester and method based on reverberation plane acoustic wave excitation
  • Composite material vibration and noise reduction tester and method based on reverberation plane acoustic wave excitation
  • Composite material vibration and noise reduction tester and method based on reverberation plane acoustic wave excitation

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Embodiment

[0064] Example: Intrinsic characteristics and vibration response tests of composite thin plates excited by planar acoustic pulses.

[0065] The reverberation box used is the box body designed by this patent. The test sample is a CF140 carbon fiber / epoxy resin composite sheet, and its intrinsic characteristics and response to planar pulse acoustic excitation are studied. This type of sheet is laid symmetrically and orthogonally, that is, [(0° / 90°) 5 / 0° / (90° / 0°) 5 ], a total of 11 layers, each layer has the same thickness and fiber volume fraction, density ρ=1778kg / m 3 , The length, width and thickness are 400×400×1.24mm.

[0066] (1) Connecting equipment: install the test piece into the frame-shaped clamping plate fixture and tighten the bolts to fix it, open the second signal output channel of the data acquisition instrument, adjust the excitation frequency of the random excitation signal, connect the pre-power amplifier, the pure rear The first-class power amplifier and ...

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Abstract

The invention relates to the technical field of material testing, in particular to an integrated tester and a test method for the vibration and noise reduction performance of composite materials. Horn and pre-power amplifier and pure post-stage power amplifier, retractable support frame, snake-shaped retractable thin tube, laser displacement sensor, multiple sound pressure sensors, the present invention can meet the requirements of composite material vibration reduction and noise reduction performance at the same time Integrated test requirements, comprehensive test indicators, and the advantages of high efficiency and mobility, which are convenient for on-site testing and objectively evaluate the vibration and noise reduction performance of composite materials.

Description

technical field [0001] The invention relates to the technical field of material testing, in particular to a composite material vibration and noise reduction tester based on reverberation and plane acoustic wave excitation and a test method thereof. Background technique [0002] With the Chinese Air Force's accelerated installation of high-performance transport aircraft, supersonic fighter jets, high-speed helicopters and other aircraft and the upgrading of power equipment, the problem of vibration and noise control in aircraft cabins has become increasingly severe. On the other hand, for surface ships and submarines whose operational scale and capabilities are constantly leaping, as the complexity of their threat targets is greatly enhanced, how to improve their vibration and noise reduction performance to meet the stringent requirements for concealment, habitability, and safety , has increasingly become an urgent problem to be solved in the development of my country's naval ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/22
CPCG01N29/045G01N29/22
Inventor 李晖赵亚卿王子恒崔晶李则霖王东升刘洋任旭辉王文煜吕海宇许卓姜世杰孙伟马辉李鹤韩清凯闻邦椿
Owner NORTHEASTERN UNIV LIAONING
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