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

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 ...

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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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