A lattice structure with vibration isolation properties

Abstract

The invention discloses a lattice structure with vibration isolation characteristics, which belongs to the field of vibration control and can solve the problems that the current lattice structure is sensitive to vibration load and has weak vibration isolation performance. The present invention is composed of cells with local resonance characteristics designed based on acoustic metamaterial units that periodically expand along the three-dimensional direction. The local resonance type cells are body-centered cubic lattice structures composed of rods, and the internal cross rods The cross-sectional area of ​​the part near the center is larger than that of other rods, and the rod with a large cross-sectional area can be regarded as a vibrator, and the length, width and height of the vibrator composed of crossed rods are 1 / 2 of the cell size. The invention can realize vibration suppression in multiple frequency bands, especially in the 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

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