Frequency-adjustable local resonance structure unit for constructing acoustic metamaterials

A technology of acoustic metamaterials and local resonance, which is applied in the field of acoustic metamaterials, can solve problems such as the difficulty of adjusting the resonance frequency, and achieve the effect of overcoming the difficulty of adjusting the resonance frequency and simple structure

Active Publication Date: 2019-05-24
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 frequency-tunable local resonance structural unit for constructing acoustic metamaterials, which has a flexible frequency modulation function and overcomes the difficulty in adjusting the resonance frequency of traditional artificial acoustic micro-structure units deficiencies, and the structure is simple

Method used

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  • Frequency-adjustable local resonance structure unit for constructing acoustic metamaterials

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Effect test

Embodiment 1

[0027] The local resonance unit adopts the form of a single vibrator. The vibrator stiffness structure 2 is a rectangular thin-layer beam whose length, width, and thickness are 130mm×12mm×2mm. The length, width and thickness of each chute are 50mm×3mm×2mm; the supporting structure 3 supports the vibrator stiffness structure 2 in the middle support, and the single weight of the vibrator mass structure 1 is 13g, and the vibrator mass structure 1 is installed on the vibrator stiffness In the chute at a distance of 30mm from the support point on structure 2; the vibrator quality structure 1 is made of steel, the vibrator stiffness structure 2 is made of aluminum, and the support structure 3 is made of PVC.

Embodiment 2

[0029] The other parameters of the second embodiment are the same as those of the first embodiment. The only difference is that in the second embodiment, the vibrator mass structure 1 is installed in the chute on the vibrator stiffness structure 2 at a distance of 40 mm from the support point.

Embodiment 3

[0031] The other parameters of the third embodiment are the same as those of the first embodiment, except that in the third embodiment, the vibrator mass structure 1 is installed in the chute on the vibrator stiffness structure 2 at a distance of 50 mm from the support point.

[0032] In the present invention, preferably, the resonant frequency of the structural unit in Embodiment 1 is 289 Hz, the resonant frequency of the structural unit in Embodiment 2 is 211 Hz, and the resonant frequency of the structural unit in Embodiment 3 is 159 Hz. The results show that the resonant frequency of the local resonance unit can be flexibly changed by adjusting the position of the vibrator mass structure 1 on the vibrator stiffness structure 2 along the adjustment device 4 without changing the original structure and material parameters; Compared with the local resonance structural unit, the frequency-tunable local resonance structural unit designed by the present invention for the construct...

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Abstract

The invention belongs to the field of acoustic metamaterials, and discloses a frequency-adjustable local resonance structure unit for constructing acoustic metamaterials. The structure unit comprisesa vibrator quality structure 1, a vibrator rigidity structure 2, a supporting structure 3 and an adjusting device 4, the adjusting device 4 is arranged on the vibrator rigidity structure 2, the vibrator quality structure 1 is mounted on the vibrator rigidity structure 2, a mounting position of the vibrator quality structure 1 on the vibrator rigidity structure 2 can be flexibly adjusted along theadjusting device 4, and the supporting structure 3 is connected with the vibrator rigidity structure 2. According to the structure unit, the position of the vibrator quality structure 1 on the vibrator rigidity structure 2 is adjusted along the adjusting device 4 without changing a structure and material parameters, the resonance frequency of the local resonance unit is flexibly adjusted, the structure unit overcomes the shortcoming that resonance frequency of a traditional artificial acoustics microstructure unit is difficultly adjusted, and the structure unit is simple in structure.

Description

technical field [0001] The invention belongs to the field of acoustic metamaterials, in particular to a frequency-adjustable local resonance structure unit. Background technique [0002] Acoustic metamaterial refers to a new type of acoustic material or structure composed of specially designed artificial acoustic micro-structural units (such as local resonance structural units, or oscillators for short) periodically arranged in an elastic medium, which can obtain extraordinary physical properties that natural materials do not have. (such as negative mass density, negative refraction, negative modulus), can achieve extraordinary manipulation of elastic waves and sound waves, making it have very considerable application prospects in many fields, such as acoustic cloaks, acoustic imaging, acoustic screening, vibration reduction noise reduction etc. [0003] The artificial acoustic microstructure unit is the basic unit for constructing acoustic metamaterials, which directly aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162G10K11/172
Inventor 肖勇温激鸿胡洋华郁殿龙
Owner NAT UNIV OF DEFENSE TECH
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