Search

CN-122014781-A - Vibration reduction and bearing integrated lattice metamaterial

CN122014781ACN 122014781 ACN122014781 ACN 122014781ACN-122014781-A

Abstract

The invention belongs to the technical field of vibration reduction bearing, and particularly relates to a vibration reduction bearing integrated lattice metamaterial. The lattice metamaterial is formed by periodically arranging a plurality of single cells in space, wherein each single cell comprises a central supporting truss framework and a local resonance functional panel, the central supporting truss framework comprises a cube framework and an inner core supporting rod system arranged in the cube framework to form a high-rigidity bearing main body, the local resonance functional panel is arranged on the top surface and/or the bottom surface of the cube framework and comprises a multi-mode local resonance system constructed by multi-stage nested hollow grooves, and a plurality of band gaps are introduced into a low frequency band by utilizing multi-mode local resonance to effectively inhibit low-broadband vibration. The lattice metamaterial provided by the invention realizes the decoupling design of static bearing performance and dynamic vibration damping performance, can meet the vibration damping performance requirement under multiple frequency bands, and has a wide engineering application range.

Inventors

  • LIU FENG
  • WANG YANFENG
  • WANG YUESHENG

Assignees

  • 天津大学

Dates

Publication Date
20260512
Application Date
20260325

Claims (7)

  1. 1. A vibration reduction and bearing integrated lattice metamaterial is characterized by being formed by periodically arranging a plurality of single cells in a space, wherein each single cell comprises a central support truss framework and a local resonance function panel, each central support truss framework comprises a cube framework (1) and an inner core support rod system (2) arranged inside the cube framework (1), the inner core support rod systems (2) are connected with corner points of the cube framework (1) and central areas of the single cells to form a bearing main body, each local resonance function panel is arranged on the top surface and/or the bottom surface of the cube framework (1), hollow groove systems are formed in the local resonance function panels, each hollow groove system divides each local resonance function panel into a panel outer frame (3) fixedly connected with the cube framework (1) and a multistage resonance subsystem suspended inside the panel outer frame (3), and each multistage resonance subsystem comprises at least two stages of mass blocks and elastic connecting pieces connected with the mass blocks.
  2. 2. The vibration reduction and bearing integrated lattice metamaterial according to claim 1, wherein the inner core support rod system (2) is of two pyramid truss structures with central symmetry, each pyramid truss structure comprises four diagonal rods, the bottom ends of the four diagonal rods are respectively connected to four corner points of the same surface of the cube frame (1), and the top ends of the four diagonal rods converge towards the geometric center of a unit cell.
  3. 3. The vibration damping and bearing integrated lattice metamaterial according to claim 2, wherein the multi-stage resonator system is in nested distribution, and the multi-stage resonator system comprises: the primary suspension frame (4) is arranged on the inner side of the panel outer frame (3); a primary elastic connecting piece (5) for connecting the panel outer frame (3) and the primary hanging frame (4); The secondary center mass block (7) is arranged in the cavity at the inner side of the primary suspension frame (4); and the second-stage elastic connecting piece (6) is used for connecting the first-stage hanging frame (4) with the second-stage center mass block (7).
  4. 4. The vibration reduction and bearing integrated lattice metamaterial according to claim 3, wherein the primary elastic connecting pieces (5) are orthogonal connecting beams and distributed in the middle of each side of the panel outer frame (3), and the secondary elastic connecting pieces (6) are diagonal connecting beams and are connected with inner corner points of the primary hanging frame (4) and the secondary central mass block (7).
  5. 5. A vibration damping and bearing integrated lattice metamaterial according to claim 4, wherein the secondary central mass block (7) consists of a rectangular block in the center and four trapezoid blocks extending from the rectangular block to the periphery, and the diagonal connecting beams extend into gaps among the trapezoid blocks.
  6. 6. The vibration damping and bearing integrated lattice metamaterial according to claim 5, wherein the single cells form a periodic array along a single direction, the number of array units is not less than 4 to form a one-dimensional lattice metamaterial beam, or the single cells form a periodic array along two orthogonal directions, the number of array units is not less than 4 to form a two-dimensional lattice metamaterial plate.
  7. 7. The vibration reduction and bearing integrated lattice metamaterial according to claim 6, wherein the cube frame (1) is composed of four vertical columns and edge frames of upper and lower bottom surfaces, and the section of each column and each diagonal rod is one of a round shape, a rectangular shape, a polygonal shape or a hollow tube shape.

Description

Vibration reduction and bearing integrated lattice metamaterial Technical Field The invention belongs to the technical field of vibration reduction bearing, and particularly relates to a vibration reduction bearing integrated lattice metamaterial. Background With the continuous development of aviation technology in China, aviation equipment represented by a new generation of large aircrafts has higher requirements on vibration level and bearing performance. On the premise of meeting the light-weight design of the structure, the bearing capacity is ensured, the vibration level is effectively restrained, the necessary requirement for ensuring the normal performance of the equipment is met, and the key point of improving the quality of the equipment such as safety, reliability and the like is also provided. The existing method for adding damping materials has limited effect of inhibiting low-frequency vibration, and meanwhile, the problem of material aging is also faced. Dynamic vibration absorbers, while suitable for lower frequency vibrations, have a narrower effective frequency band. Therefore, there is a need to explore new technological approaches to overcome the limitations of these existing approaches. The lattice sandwich board consists of a panel and a periodic lattice core layer, has the advantages of light weight, high specific strength, high specific rigidity and the like, and is widely applied to the fields of static bearing and impact resistance. However, due to its high porosity characteristics, the structural damping of the existing lattice sandwich panel is low, and it is difficult to effectively suppress vibration transmission. The appearance of the mechanical metamaterial provides a new idea for solving the problems. By designing specific microstructure units (unit cells), the mechanical metamaterial can generate elastic wave band gaps based on Bragg scattering or a local resonance mechanism to block vibration transmission in a specific frequency band. At present, a metamaterial band gap mechanism is introduced into a research of a lattice sandwich board, and aims to construct a structure which gives consideration to bearing and vibration reduction, but the existing design is difficult to realize high-efficiency vibration reduction of low frequency and wide frequency band on the premise of keeping the light weight and high bearing capacity of the structure. Therefore, the vibration reduction bearing integrated lattice sandwich metamaterial capable of considering light weight, high strength and low frequency broadband vibration reduction performance is developed, and has important engineering application value. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the vibration reduction and bearing integrated lattice metamaterial, wherein a resonance panel with a multistage nested hollowed-out characteristic is integrated on the surface of the traditional center support cube lattice structure, a multi-mode local resonance system is constructed by utilizing a hollowed-out groove system, and a plurality of band gaps are introduced into a low frequency band on the premise of not damaging the bearing path of the main body of the lattice structure, so that the effective attenuation of vibration with specific frequency is realized. In order to achieve the above purpose, the present invention adopts the following technical scheme: The lattice metamaterial comprises a plurality of single cells which are periodically arrayed in space, wherein each single cell comprises a central supporting truss framework and a local resonance functional panel, each central supporting truss framework comprises a cube framework and an inner core supporting rod system arranged in the cube framework, each inner core supporting rod system is connected with an angular point of the cube framework and a single cell central area to form a bearing main body with high rigidity, each local resonance functional panel is arranged on the top surface and/or the bottom surface of the cube framework, a hollowed-out groove system penetrating through the thickness direction is formed in each local resonance functional panel, each hollowed-out groove system divides each local resonance functional panel into a panel outer frame fixedly connected with the cube framework and a multistage resonance subsystem suspended in the panel outer frame, and each multistage resonance subsystem comprises at least two stages of mass blocks and elastic connecting pieces connected with the mass blocks to form a multi-degree-of-freedom mass-spring system. In some possible embodiments, the inner core supporting rods are two pyramid truss structures with central symmetry, each pyramid truss structure comprises four inclined rods, the bottom ends of the four inclined rods are respectively connected to four corner points on the same surface of the cube frame, and the top ends of the four inclined rods converge towards the geome