High-stiffness and high-damping local resonance unit for constructing acoustic metamaterial structure

Abstract

The invention belongs to the field of vibration and noise control, and discloses a high-stiffness and high-damping local resonance unit for constructing an acoustic metamaterial structure. The high-stiffness and high-damping local resonance unit comprises an oscillator elastic element 1, an oscillator rigid element 2, an oscillator elastic element 3, a support and protection structure 4 and an oscillator unit 5. The oscillator elastic element 1 is firmly connected with one end of the oscillator rigid element 2; the other end of the oscillator rigid element 2 is firmly connected with the oscillator elastic element 3; and after being connected, the vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are closely placed together in the support and protection structure 4 to form the vibrator unit 5. The oscillator unit 5 can simultaneously give consideration to the performance of high rigidity and high damping, can generate multiple coupling action resonance modes in a low frequency band, can effectively broaden the low-frequency resonance frequency band by designing the oscillator unit 5 or changing the installation state or the combination modethereof, and the high-stiffness and high-damping local resonance unit has an important application prospect in terms of vibration and noise reduction of modern equipment.

Description

technical field [0001] The invention belongs to the field of vibration and noise control, and relates to a local resonance unit with high rigidity and high damping for constructing an acoustic metamaterial structure. Background technique [0002] Acoustic metamaterial structure refers to a new type of acoustic structure composed of specially designed artificial acoustic microstructure units (such as local resonance units, referred to as oscillator units or oscillators) periodically embedded in the elastic structure or attached to its surface, which can obtain natural materials. The extraordinary physical properties (such as negative mass density, negative modulus, etc.) that it does not have can realize the extraordinary manipulation of elastic waves and sound waves, making it have very considerable application prospects in many fields, such as vibration reduction and noise reduction, acoustic cloak , acoustic imaging, acoustic screening, etc. [0003] The artificial acoust...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the above-mentioned background technology, and provide a high-stiffness and high-damping local resonance unit for constructing an acoustic metamaterial structure, which can simultaneously take into account the performance of high stiffness and high damping. The low-frequency band can produce a variety of coupling resonance modes, and it also has a strong protective function. In addition, it can be changed only by changing the installation and The layout method can realize the function of widening the low-frequency resonance frequency band, which overcomes the defects of traditional artificial acoustic microstructure units such as poor stiffness-damping comprehensive performance, weak anti-interference and protection capabilities, and narrow operating frequency band.

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