Airbag-based three-dimensional phononic crystal vibration damping device

Abstract

The invention discloses a three-dimensional phonon crystal damping device based on anairbag. The three-dimensional phonon crystal damping device based on the airbag comprises a scatterer, the saucer-shaped airbag, an upper grating plate, a lower grating plate, a flat plate, an air inflation pipeline, an air valve device and an air storage tank. The saucer-shaped airbag is attached to the scattererto form a scattering unit, the scattering unit is stuck to the grating plates to form a two-dimensional phonon crystal structure, and the two-dimensional phonon crystal structure extends in a third dimension to form a three-dimensional phonon crystal structure. A local area resonating phonon crystal is stimulated by elastic waves within a certain frequency range, the scattering unit resonates, consumes energy transferred by the elastic waves, interacts with long waves and travelling waves of the elastic waves, and inhibits vibrating elastic force waves. The structure of the three-dimensionalphonon crystal damping device based on the airbag can regulate connecting rigidity of the scattering unit by regulating inflating volume of the sauce-shaped airbag, and further regulate a damping frequency band range of the phonon crystal.

Description

technical field [0001] The invention relates to an airbag-based three-dimensional phonon crystal vibration damping device, which belongs to the technical field of vibration and noise reduction. Background technique [0002] With the development of science and technology and the improvement of the quality of life, the requirements for the vibration and noise of mechanical structures in various fields are getting higher and higher. Problems such as resonance and fatigue damage caused by vibration or impact in engineering will affect the life of mechanical structures and the working accuracy of precision instruments, and will also generate noise, which will endanger human life and health. It is of great significance to suppress the vibration and noise of mechanical structures in practical engineering. [0003] The bandgap properties of phononic crystals can significantly suppress or even prohibit the propagation of vibrational elastic waves in the forbidden band range. Based ...

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Problems solved by technology

[0004] In recent years, people have never stopped researching on the use of phononic crystals to suppress vibration and noise. For example, patent application number 201611244380.9 discloses a phononic crystal structure for ship vibration isolation: based on the principle of local resonance, phononic crystals The matrix is ​​distributed in a honeycomb structure, the spring is placed on the inner wall of the honeycomb, and the tungsten block is connected to the matrix through the spring, but this structure cannot suppress the vibration in the three-dimensional direction, nor can it adjust the bandgap range

Patent application number 201410377170.1 discloses a phononic crystal vibration isolator based on a shape memory alloy with adjustable bandgap. This patent is based on the shape memory effect of the shape memory alloy to realize the adjustment of the bandgap of the phononic crystal, but the structure is one-dimensional Phononic crystal isolators that can only adjust the bandgap in one dimension

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