Search

CN-117366164-B - Plate-rod combined negative stiffness shock absorber

CN117366164BCN 117366164 BCN117366164 BCN 117366164BCN-117366164-B

Abstract

The invention discloses a plate-rod combined type negative stiffness vibration damper which comprises a vibration damping object, a linear supporting spring, linear damping, sliding grooves, plate springs, connecting rods, rigid cantilevers and smooth hinges, wherein one end of the vibration damping object is elastically connected with side walls through the linear supporting spring and the linear damping, the other end of the vibration damping object is fixedly connected with the rigid cantilevers, the vibration damping object horizontally slides in the sliding grooves horizontally through pulleys, two end faces of the plate springs are fixed with the side walls together, the center positions of the plate springs are arch height positions, the plate springs are symmetrically distributed on the rigid cantilevers in the horizontal direction in a mode of opposite arch height positions, the left side and the right side of the center positions of the plate springs are symmetrically provided with connecting rods which are mutually horizontal, one end of each connecting rod is smoothly hinged with the plate springs, and the other end of each connecting rod is smoothly hinged with the rigid cantilevers. The vibration damper can control vibration in the horizontal direction and has the advantages of simple structure, light weight, easy manufacture, low price, reliable work, strong bearing capacity and the like.

Inventors

  • CAO DENGQING
  • Ye Huiran
  • CHEN SHUAI

Assignees

  • 哈尔滨工业大学

Dates

Publication Date
20260508
Application Date
20231109

Claims (5)

  1. 1. The utility model provides a board pole combination formula negative rigidity shock absorber, its characterized in that the shock absorber includes damping object, linear supporting spring, linear damping, spout, negative rigidity structure, wherein: the negative stiffness structure comprises a plate spring, a connecting rod and a rigid cantilever; One end of the vibration reduction object is elastically connected with the side wall through a linear supporting spring and a linear damper, and the other end of the vibration reduction object is fixedly connected with the rigid cantilever; the vibration reduction object horizontally slides in a horizontally placed chute through a pulley; the two end faces of the plate spring are fixed with the side wall, and the center position of the plate spring is an arch height position; the number of the plate springs is two, and the two plate springs are symmetrically distributed about the rigid cantilever in the horizontal orthogonal direction in a mode of opposite arch height positions; connecting rods which are parallel to each other are symmetrically arranged on the left side and the right side of the central position of the plate spring; One end of the connecting rod is hinged with the plate spring, and the other end of the connecting rod is hinged with the rigid cantilever; The assembly process of the negative stiffness structure comprises the steps of (1) horizontally arranging the leaf springs in a mode of opposite arch height positions and installing the connecting rods and the rigid cantilevers, (2) respectively installing adjusting rods at the end faces of different leaf springs, wherein each adjusting rod consists of a long rod and two short rods, the long rods are mutually perpendicular to the short rods, the end faces of the leaf springs are clamped at the perpendicular positions of the long rods and the short rods, the long rods are parallel to the connecting rods and the short rods are parallel to the rigid cantilevers as far as possible, 3, the two short rods retract towards the direction of the rigid cantilevers to drive the end faces of the leaf springs to be close to the arch height positions, 4) after the expected effect is achieved, fixing the leaf springs on the side walls, and removing the adjusting rods.
  2. 2. The plate and rod combined negative stiffness vibration damper according to claim 1, wherein the plate spring has an initial shape that can be pre-manufactured or pre-compressed.
  3. 3. The plate and rod combined negative stiffness vibration damper according to claim 1, wherein the plate and rod combined negative stiffness vibration damper is adapted for simple harmonic excitation and random excitation under seismic action.
  4. 4. Use of a plate and rod combined negative stiffness vibration absorber according to any of claims 1-3 for horizontal vibration control of a single degree of freedom system.
  5. 5. Use of a plate and rod combined negative stiffness vibration absorber according to any one of claims 1-3 in vibration control in the horizontal direction of a multiple degree of freedom system.

Description

Plate-rod combined negative stiffness shock absorber Technical Field The invention belongs to the technical field of structural vibration reduction (vibration), relates to a vibration absorber, and in particular relates to a plate and rod combined type negative stiffness vibration absorber. Background Vibration is widely found in the industrial fields of automobiles, ships, aerospace, ultra-precision machinery, and the like, and often has a significant negative impact on engineering systems. If the weight is light, faults can be caused, the production efficiency and the product quality are affected, and if the weight is heavy, safety accidents and casualties can be caused. Therefore, finding a suitable vibration suppression means to reduce or even eliminate the adverse effects caused by vibrations in engineering to ensure the structure works properly is often the primary task of engineering practice. At present, passive vibration control technology has been widely studied and developed, and has been widely used in the fields of civil construction, mechanical engineering and the like. However, most of the conventional vibration dampers use a linear system, however, due to the mutual restriction between the bearing capacity and the operating frequency band, it is often difficult to achieve an ideal vibration damping result, and even in some cases, a phenomenon of vibration amplification occurs. To overcome the drawbacks of conventional linear passive vibration damping techniques, related researchers often improve the vibration damping performance of the system by designing and introducing a non-linear negative stiffness device. The existing negative stiffness device comprises (1) a diagonal spring structure (or a diagonal spring connecting rod structure) based on geometric nonlinearity, (2) a buckling beam structure based on elastic body deformation, and (3) an electromagnetic structure based on interaction between different magnetic poles. The oblique spring structure has the advantages of clear principle, simple structure and the like, is a common simplified equivalent form in the design of a vibration reduction system in actual engineering, has poor stability, is very easy to cause buckling problems in the installation and use processes, has good stability, has an effective section severely limited by the thickness of a beam, is not suitable for engineering practice, and has high manufacturing cost, and an electromagnetic device severely depends on external energy. The negative stiffness structure of the canted spring constructed using the coil spring as shown in fig. 1 (or the canted spring link structure as shown in fig. 2) is poor in stability during vibration, and vibration damping performance is severely affected by installation and manufacturing errors. Meanwhile, vibration damping control directions are mostly vertical directions, and vibration control in the horizontal direction, especially design resisting horizontal earthquake excitation, is relatively few. This limits the popularity of negative stiffness vibration dampers in a wider, diverse range of engineering applications. In summary, the existing negative stiffness-based damping device has the problem of poor stability, which is a main blocking factor of related products of the negative stiffness damping system which is not mature yet. In addition, large coil springs present multiple challenges in practical engineering applications. Firstly, the processing difficulty is high, an accurate and complex manufacturing process is required, secondly, the cost is relatively high, the investment of the whole project is increased, furthermore, the mounting and maintenance difficulty is relatively high, and professional technologies and personnel are required to ensure the normal operation of the device. Disclosure of Invention In order to effectively solve the problems of stability and cost of a traditional coil spring negative stiffness device, the invention provides a plate and rod combined negative stiffness shock absorber. The vibration damper can control vibration in the horizontal direction, has the advantages of simple structure, light weight, easy manufacture, low price, reliable work, strong bearing capacity and the like, and ensures the stability and durability of the vibration damper under various working conditions. The combined design of the leaf spring and the connecting rod not only enhances the structural stability of the shock absorber, but also makes the shock absorber excellent in vibration control in the horizontal direction. The innovative design not only helps to improve the vibration resistance of the building and mechanical structures, but also greatly reduces the complexity and cost of maintenance and management. The invention aims at realizing the following technical scheme: the utility model provides a board pole combination formula negative rigidity shock absorber, includes damping object, linear supporting spring, linear d