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Nonlinear coupling resonance unit and nonlinear acoustic meta-material cellular structure

A technology of nonlinear coupling and resonance unit, which is applied in the fields of aerospace, solid mechanics, vibration and noise control, metamaterials, and mechanical engineering to achieve the effect of compact structure and high-efficiency vibration suppression effect

Active Publication Date: 2021-07-23
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is, the narrow-band elastic wave gap of linear metamaterials can attenuate structural vibrations, but the response in its wider pass-band is amplified by resonance

Method used

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  • Nonlinear coupling resonance unit and nonlinear acoustic meta-material cellular structure
  • Nonlinear coupling resonance unit and nonlinear acoustic meta-material cellular structure
  • Nonlinear coupling resonance unit and nonlinear acoustic meta-material cellular structure

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Embodiment Construction

[0032] The following descriptions are only a few embodiments of the present invention, and are not intended to limit the present invention in any form. Any skilled person who is familiar with the profession can use the technical content disclosed above to make some The changes or modifications are equivalent to equivalent implementation cases, and all belong to the scope of the technical solution.

[0033] The strongly nonlinear coupling resonant unit and nonlinear acoustic metamaterial involved in the present invention can be specifically implemented through the following five steps.

[0034] Step 1: Determine the real force and equivalent strong nonlinear stiffness coefficient of the coupled resonance element

[0035] The vertical nonlinearity is realized by a piecewise nonlinear spring. During the movement process, the force F(x) on the vibrator varies with the displacement x as a piecewise function:

[0036]

[0037] Among them, k 1 is the linear spring stiffness; P i...

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Abstract

The invention relates to a nonlinear coupling resonance unit and a nonlinear acoustic meta-material cellular structure. The nonlinear coupling resonance unit comprises a vibrator, a spring, a base, a sleeve and a support bar, wherein a center hole is formed in the middle of the vibrator, and the support bar penetrates through the center hole of the vibrator; the vibrator and the support bar are coaxially arranged; the support bar takes the vibrator as a midpoint, and two ends of the support bar are symmetrical and sleeved in the sleeve; the base is arranged at the end, away from the vibrator, of the sleeve, and the two ends of the vibrator are fixedly connected to the base through the spring; and gaps are arranged between the end face of the vibrator and the end face of the sleeve and between the center hole of the vibrator and the support bar. The unit has the characteristics of compact structure, adjustability and the like; and by applying the unit and based on a typical plate shell structure, a super-nonlinear material structure is designed, a nonlinear local resonance band gap and a chaotic band can be generated, and a low-frequency broadband vibration suppression effect is generated under small additional mass.

Description

technical field [0001] The invention relates to a nonlinear coupling resonance unit, a nonlinear acoustic metamaterial cell and a nonlinear acoustic metamaterial structure thereof, and belongs to the fields of aerospace, mechanical engineering, solid mechanics, vibration and noise control and metamaterials. Background technique [0002] Structural vibration suppression has an important impact on equipment / equipment / product performance. Especially in the field of aerospace, the service environment of the equipment is harsh and the lightweight structure is very important. There are many plate and shell structures on the aircraft / rocket, and the vibration generated by the engine and aerodynamic excitation not only affects the stability, safety and precision of the aircraft structure The accuracy of the instrument, etc., while vibration and radiation noise seriously affect the comfort of passengers. Constrained by the weight, size, efficiency, and environmental adaptability of ...

Claims

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Application Information

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IPC IPC(8): F16F7/104
CPCF16F7/104F16F2224/02F16F2228/066
Inventor 方鑫盛鹏温激鸿
Owner NAT UNIV OF DEFENSE TECH
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