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CN-121999748-A - Low-frequency vibration reduction structure based on honeycomb Bragg phonon crystal and application thereof

CN121999748ACN 121999748 ACN121999748 ACN 121999748ACN-121999748-A

Abstract

The invention discloses a low-frequency vibration reduction structure based on honeycomb Bragg photonic crystals and application thereof, comprising a plurality of honeycomb unit bodies, wherein the honeycomb unit bodies are periodically arranged in space to form a three-dimensional photonic crystal structure, each honeycomb unit body is formed by a functional gradient composite material layer serving as a matrix and a flexible coating layer serving as a reflecting layer, through hole arrays are uniformly distributed on the honeycomb unit bodies, the honeycomb unit bodies have fixed geometric cycle constants, and the low-frequency vibration reduction structure is based on Bragg scattering mechanism, and generates a plurality of low-frequency band gaps in a frequency range of 0-100Hz through geometric coupling generated by the through hole arrays and wave impedance mismatch of material interfaces so as to realize the inhibition and dissipation of low-frequency elastic waves. The invention has the advantages of low band gap initial frequency, strong attenuation capability, good structural designability, bearing capacity and flexibility, and is suitable for the scenes of bridge, track, precise equipment protection and the like.

Inventors

  • LI SHUQIN
  • Ma Yunxuan
  • YANG ZHENYU
  • DONG HUI
  • LI YUJIA
  • SUN ZHIBIN
  • LI YONGXIN

Assignees

  • 合肥工业大学

Dates

Publication Date
20260508
Application Date
20260409

Claims (10)

  1. 1. The low-frequency vibration reduction structure based on the honeycomb Bragg photonic crystal is characterized by comprising a plurality of honeycomb unit bodies which are periodically arranged in space to form a three-dimensional photonic crystal structure, wherein each honeycomb unit body is formed by a functional gradient composite material layer serving as a matrix and a flexible coating layer serving as a reflecting layer, through hole arrays are uniformly distributed on the honeycomb unit bodies, the honeycomb unit bodies have a fixed geometric cycle constant, and the low-frequency vibration reduction structure is based on Bragg scattering mechanism, generates a plurality of low-frequency band gaps in a frequency range of 0-100 Hz through geometric coupling generated by the through hole arrays and wave impedance mismatch of material interfaces, so that the suppression and dissipation of low-frequency elastic waves are realized.
  2. 2. The honeycomb Bragg photonic crystal-based low frequency vibration damping structure of claim 1, wherein the functionally graded composite layer is a tungsten-epoxy composite for regulating local stiffness and mass distribution.
  3. 3. The honeycomb Bragg photonic crystal-based low frequency vibration reduction structure according to claim 1, wherein the flexible cladding layer is an ultra-soft silicone rubber flexible layer that forms a spatial interlock with the functionally graded composite material layer along a periodic alignment direction.
  4. 4. The low-frequency vibration damping structure based on honeycomb Bragg photonic crystals according to claim 1, wherein the through-hole array is a plurality of uniformly arranged cylindrical holes, the diameter of the cylindrical holes is 0.005m, the hole pitch is 0.015m, and the through-hole array is designed according to Bragg scattering conditions for enhancing the periodic scattering effect.
  5. 5. The low frequency vibration absorbing structure based on cellular Bragg photonic crystals according to claim 1, wherein the lattice constant of the cellular unit cell is 0.025m to 0.1m, and the starting frequency of the low frequency band gap decreases as the lattice constant increases.
  6. 6. The honeycomb Bragg photonic crystal-based low frequency vibration damping structure of claim 1, wherein the functionally graded composite layer has a young's modulus of 2.89 x 10 11 Pa, a density of 13835 kg/m 3 , and a poisson's ratio of 0.30.
  7. 7. The honeycomb Bragg photonic crystal-based low frequency vibration damping structure of claim 1, wherein the ultra-soft silicone rubber flexible layer has a young's modulus of 2 x 10 6 Pa, a density of 1100 kg/m 3 , and a poisson's ratio of 0.49.
  8. 8. The low frequency vibration absorbing structure based on cellular Bragg photonic crystals of claim 1, wherein said low frequency vibration absorbing structure has an effective band gap width of 82.09 Hz formed in the range of 0 Hz-100 Hz, wherein the frequency range of the first band gap starts at 11.115Hz.
  9. 9. The low frequency vibration absorbing structure based on honeycomb Bragg photonic crystals according to claim 1, wherein the honeycomb unit body has a cubic structure with an external dimension of 0.1m x 0.1m and is periodically arranged in a simple cubic lattice.
  10. 10. Use of a low frequency vibration damping structure based on cellular Bragg photonic crystals as claimed in any one of claims 1 to 9 between bridge supports and capping beams, in rail fastener systems or as an anti-collision protection for precision instruments.

Description

Low-frequency vibration reduction structure based on honeycomb Bragg phonon crystal and application thereof Technical Field The invention relates to the technical fields of engineering vibration control and new materials, in particular to a low-frequency vibration reduction structure based on honeycomb Bragg phonon crystals and application thereof. Background Low frequency vibrations (typically referred to as elastic waves having frequencies below 100 Hz) are widely found in traffic engineering, bridge structures, rail systems, large mechanical equipment, and precision instrument operating environments. The vibration has the characteristics of long wavelength, small attenuation and large energy, is easy to propagate through the structural body in a long distance, and causes structural fatigue damage, comfort drop, precision equipment misalignment and even safety accidents. Therefore, how to effectively inhibit the propagation of low-frequency vibration is always a key problem to be solved in the field of engineering vibration control. At present, the passive vibration isolation measures commonly used in engineering mainly comprise a rubber vibration isolation support, a damping composite material layer, a spring vibration isolator and the like. The traditional vibration isolation element can play a good vibration isolation effect in a medium-high frequency range (generally more than 100 Hz), but is limited by the intrinsic characteristics and the geometric dimensions of the material in a low frequency range (< 100 Hz), so that effective wave impedance mismatch is difficult to form, and the vibration isolation capability is remarkably reduced. In addition, the traditional vibration isolation structure often needs larger mass or size to realize low-frequency vibration isolation, and is difficult to meet the engineering requirements of light weight and compactness. Phononic crystals are artificial composite materials formed by periodically arranging different elastic materials or structural units, which are capable of generating a "band gap" effect in a specific frequency range, preventing the propagation of elastic waves. In recent years, phonon crystals based on Bragg scattering mechanism show wide application prospects in the field of vibration reduction and noise reduction. However, the existing Bragg type phonon crystal generally has the technical bottlenecks that firstly, the band gap initial frequency is limited by the lattice constant and the material wave speed, a low-frequency band gap is difficult to open under the limited structure size, secondly, the band gap width is narrow, a low-frequency vibration source with wide frequency continuity in engineering is difficult to cover, thirdly, most of researches are concentrated on single material combination or simple geometric configuration, and the researches on comprehensive regulation and control mechanisms of material gradient distribution, flexible layer introduction and pore collaborative design are insufficient, so that the low-frequency vibration damping performance and the structure bearing function are difficult to be compatible. Therefore, how to realize the elastic wave suppression of the ultra-low band width band gap of 0-100Hz in the limited structure size and simultaneously consider the bearing capacity and the engineering feasibility of the structure becomes a technical problem to be solved by the technicians in the field. SUMMARY OF THE PATENT FOR INVENTION The invention aims to provide a low-frequency vibration damping structure based on honeycomb Bragg phonon crystals and application thereof, which realize broadband low-frequency vibration damping at 0-100 Hz through the collaborative design of a functional gradient material, honeycomb topology and periodical pores, has the advantages of low band gap initial frequency, strong damping capacity, good structural designability, bearing and flexibility, and is suitable for the scenes of bridge, track, precise equipment protection and the like. In order to achieve the above object, the present invention provides the following solutions: The low-frequency vibration reduction structure based on the honeycomb Bragg photonic crystal comprises a plurality of honeycomb unit bodies which are periodically arranged in space to form a three-dimensional photonic crystal structure, wherein each honeycomb unit body is composed of a functional gradient composite material layer serving as a matrix and a flexible coating layer serving as a reflecting layer, through hole arrays are uniformly distributed on the honeycomb unit bodies, the honeycomb unit bodies have a fixed geometric cycle constant, and the low-frequency vibration reduction structure is based on a Bragg scattering mechanism, and generates a plurality of low-frequency band gaps within a frequency band of 0-100 Hz through geometric coupling generated by the through hole arrays and wave impedance mismatch of material interfaces so as to realize th