Lattice structure with vibration isolation characteristic

Abstract

The invention discloses a lattice structure with vibration isolation characteristics, and belongs to the field of vibration control, the problem that a current lattice structure is sensitive to vibration load and weak in vibration isolation performance can be solved. According to the structure, the cell element with the local resonance characteristic designed based on the acoustic metamaterial unit is periodically expanded in the three-dimensional direction, the local-area resonance type cell element is of a body-centered cubic lattice structure composed of rod pieces, the sectional area of the part, close to the center, of the inner cross rod piece is larger than that of other rod pieces, a rod piece with a large cross section can be seen as a vibrator, wherein the oscillator is composedof crossed rod pieces, and the length width is half of the vibrator. The vibration inhibition can be realized in a multi-frequency band, especially in a lower frequency range, and can be used for vibration isolation facilities with bearing requirements.

Description

technical field [0001] The invention belongs to the technical field of vibration control, in particular to a lattice structure with vibration isolation characteristics. Background technique [0002] Due to its light weight, high specific strength and high specific stiffness, the periodic lattice structure composed of rods is used in aerospace, construction engineering, vehicles and ships and other fields. At the same time, because of its light weight and high stiffness, the structure It is easy to generate vibration and radiate noise under external excitation. Effective vibration control can avoid structural damage and improve the comfort of human working environment. [0003] As a periodic structure, phononic crystals can suppress the propagation of elastic waves in certain frequency ranges through periodic changes in material or structural parameters. These frequency ranges are called Bragg scattering band gaps, and the band gap frequency The corresponding wavelengths are...

AI Technical Summary

Problems solved by technology

Combined with the design concept of acoustic metamaterials, L.Junyi et al. realized low-frequency vibration by adding a cantilever structure with end mass at the node in the three-dimensional rod lattice structure designed by J.Solids Struct.91,55-71 in 2016 Inhibition, that is, the mechanical properties of the structure and the vibration isolation performance are considered separately, and the cantilever structure acts as a local resonance unit. However, the manufacture of the lattice structure will become complicated and it is not convenient for integrated molding

Images