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Oscillator unit and its based nonlinear acoustic metamaterial cellular structure

A technology of nonlinear acoustics and metamaterials, applied in the functional characteristics of spring/shock absorber, shock absorber, non-rotational vibration suppression, etc., to achieve the effect of breaking the limitation of low-frequency broadband

Active Publication Date: 2020-05-19
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the generation and regulation techniques of broadband chaotic bands have not yet been developed; traditional weakly nonlinear structures require large displacement excitations to generate strongly nonlinear chaotic responses

Method used

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  • Oscillator unit and its based nonlinear acoustic metamaterial cellular structure
  • Oscillator unit and its based nonlinear acoustic metamaterial cellular structure
  • Oscillator unit and its based nonlinear acoustic metamaterial cellular structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] In the vibrator unit of Embodiment 1, the cladding layer 30 is clad on the outer surface of the spherical body 21 . The surface of the sphere 21 facing the base 40 is not provided with the cladding layer 30 . There is a small gap δ between the sphere 21 wrapped by the coating layer 30 and the inner wall of the cavity. 0 Satisfy δ 0 = r B -r Ac , where r B is the inner diameter of the cavity, r Ac is the radius of the sphere 21 after the cladding layer 30 is set.

[0098] see Figure 4 , the two oscillators are in the small gap δ 0 The contact collision generated during internal motion forms a strong nonlinear coupling, and the equivalent nonlinear stiffness coefficient k c for Among them, the positive odd integer n is the selected equivalent order, c F is the constant coefficient needed to approximate the function, δ 0 reduce k by an order of magnitude c Just increase by n orders of magnitude. During use, those skilled in the art can adjust the gap value b...

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Abstract

The invention relates to a vibrator unit and a nonlinear acoustic metamaterial cellular structure based on the oscillator unit, and belongs to the field of mechanical engineering, mechanics and meta-materials. The vibrator unit and the nonlinear acoustic metamaterial cellular structure based on the oscillator unit aim to realize ultra-low-frequency ultra-wideband vibration reduction of the strongnonlinear acoustic metamaterial design and structure. The multi-vibrator physical coupling is applied to generate a strong nonlinear effect, so that a vibrator unit is formed, and a metamaterial cellis designed on the basis of the vibrator unit. The metamaterial cell can generate a low-frequency nonlinear locally resonant band gap and a broadband chaotic band, and the chaotic band width is controlled by a bridge connection coupling with different resonance. The strong nonlinear acoustic metamaterial structure with cellular design can be applied to generate super-low-frequency ultra-wideband vibration suppression effect.

Description

technical field [0001] The invention relates to a vibrator unit, a nonlinear acoustic metamaterial cell and a nonlinear acoustic metamaterial structure thereof, and belongs to the fields of mechanical engineering, mechanics, vibration and noise control, and nonlinear acoustic metamaterial structures. Background technique [0002] Structural vibration and noise widely exist in military equipment and civil machinery. Vibration and noise will not only directly affect the comfort of the occupants, reduce the acoustic stealth performance of submarines and helicopters, but also lead to serious accidents such as loss of control, structural fatigue damage, fracture, and explosive disintegration. Designing materials and structures with vibration suppression properties and using them in equipment structure design is of great significance to reduce the overall vibration and noise of equipment. However, the traditional dynamic vibration absorption and damping technology is still diffic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F15/02
CPCF16F15/02F16F2224/025F16F2228/04
Inventor 方鑫温激鸿郁殿龙尹剑飞
Owner NAT UNIV OF DEFENSE TECH
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