A vibration isolator with multiple bandgap characteristics

Abstract

This invention relates to a vibration isolator with multiple bandgap characteristics, comprising upper and lower cover plates connected and fixed by bolts. Several damping units are arranged between the two cover plates, and an elastic damping filling layer is provided in the gaps between the damping units. A protective layer surrounds all the damping units and the elastic damping filling layer between the two cover plates. Each damping unit comprises several layers of metal oscillators arranged sequentially from the inside out, with elastic elements filling the spaces between the metal oscillators. The damping unit of this invention possesses a wider range of bandgap bandwidths. By changing the material properties of the elastic elements, the bandgap of the damping unit can be controlled, thereby achieving adjustable vibration isolator performance and enabling effective attenuation of vibrations covering a wider frequency range, from high to low frequencies.

Description

Technical Field

[0001] This invention relates to the field of vibration isolation of large buildings under external loads, and particularly to a vibration isolator with multiple band gap characteristics. Background Technology

[0002] Vibration is prevalent in civil engineering, threatening not only structural safety but also the normal operation of precision instruments within the structure. Passive vibration isolation technology, as an effective vibration control method, is now widely used in the field of structural vibration control in civil engineering. Traditional passive vibration isolation technology mainly utilizes elastic elements such as metal springs and rubber in combination with damping elements for vibration isolation, requiring no external energy input. Its main principle is to reduce the natural frequency of the structure, thereby reducing the vibration energy transmitted from the vibration source to the vibrating object, thus achieving vibration control. Although passive vibration isolation methods can significantly reduce the natural frequency of the structure and improve isolation efficiency, when the dynamic characteristics of the main structure or load change, the dynamic characteristics of the passive vibration isolation device cannot be adjusted in real time due to its special construction, resulting in a deterioration in control effect. Summary of the Invention

[0003] The present invention aims to overcome the shortcomings of the prior art and provide a vibration isolator with multiple bandgap characteristics.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A vibration isolator with multiple band gap characteristics includes upper and lower cover plates, which are connected and fixed by connecting bolts. Several vibration damping units are arranged between the two cover plates, and an elastic damping filling layer is provided in the gap between the vibration damping units. A protective layer is provided around all vibration damping units and the elastic damping filling layer between the two cover plates.

[0006] The vibration damping unit consists of several layers of metal oscillators arranged sequentially from the inside out, with elastic elements filling the spaces between the metal oscillators.

[0007] The innermost metal oscillator has a cuboid structure, while the outermost metal oscillator has a U-shaped structure.

[0008] Several lead core pillars are evenly distributed between the two cover plates.

[0009] The two cover plates have corresponding connection holes on both sides. The connecting bolts are inserted into the corresponding connection holes of the two cover plates and fixed with nuts.

[0010] The number of layers in a U-shaped metal oscillator should be no less than two.

[0011] There are four lead core pillars.

[0012] The beneficial effects of the present invention are: the vibration damping unit of the present invention has more band gaps with different bandwidths. By changing the material properties of the elastic element, the band gap of the vibration damping unit can be controlled, thereby realizing the performance adjustability of the vibration isolator, so that the vibration isolator can effectively attenuate vibrations covering a wider frequency range of high and low frequencies. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of the present invention with the protective layer omitted;

[0015] Figure 3 This is a diagram showing the internal structure of the present invention;

[0016] Figure 4 This is a schematic diagram of the vibration damping unit in this invention;

[0017] Figure 5 This is a schematic diagram of a certain resonance mode of the vibration reduction unit in this invention under external load;

[0018] Figure 6 This is a schematic diagram of the bandgap characteristics of the vibration damping unit in this invention;

[0019] In the diagram: 1-Cover plate; 2-Connecting bolt; 3-Vibration damping unit; 4-Elastic damping filler layer; 5-Protective layer; 6-Lead core column; 7-Connecting hole; 8-Nut;

[0020] 31-Metal oscillator; 32-Elastic element;

[0021] The following will describe in detail, with reference to the accompanying drawings, embodiments of the present invention. Detailed Implementation

[0022] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0023] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0026] A vibration isolator with multiple bandgap characteristics, such as Figure 1-3 As shown, it consists of a cover plate 1, connecting bolts 2, vibration damping unit 3, elastic damping filling layer 4, protective layer 5, and lead core column 6.

[0027] The cover plate 1 includes two parts, upper and lower. Several vibration damping units 3 are arranged between the two cover plates 1, and an elastic damping filling layer 4 is provided in the gaps between the vibration damping units 3. A protective layer 5 is provided around all the vibration damping units 3 and the elastic damping filling layer 4 between the two cover plates 1.

[0028] The elastic damping filling layer 4 is made of materials such as polyurethane and silicone rubber. Its main function is to transmit force and displacement, while providing deformation space for the vibration damping unit 3.

[0029] The main function of the cover plate 1 is to fix the internal vibration damping unit 3. The two cover plates 1 have corresponding connection holes 7 on both sides. The connecting bolts 2 are inserted into the corresponding connection holes 7 of the two cover plates 1 and fixed by nuts 8.

[0030] The main function of the protective layer 5 is to protect the vibration damping unit 3 and the elastic damping filling layer 4 inside the vibration isolator, and to prevent the internal structure from being damaged by natural environment or external force.

[0031] The lead core column 6 has high initial yield stiffness and low post-yield stiffness. Arranging an appropriate number of lead core columns 6 in the vibration isolator can improve the energy dissipation performance of the vibration isolator and at the same time improve the initial stiffness of the vibration isolator.

[0032] The vibration damping unit 3 consists of multiple layers of metal oscillators 31 and elastic elements 32, with elastic elements 32 filling the spaces between adjacent metal oscillators 31, such as... Figure 4 As shown. The innermost metal oscillator 31 has a cuboid structure, while the outer metal oscillator 31 has a U-shaped structure; the U-shaped metal oscillator 31 has no fewer than two layers.

[0033] The materials of the three components of the vibration damping unit must meet the following characteristics:

[0034] The density of the metal oscillator 31 is greater than the density of the elastic element 32 so that the metal oscillator 31 can store energy;

[0035] The elastic modulus of the elastic element 32 is less than that of the metal oscillator 31;

[0036] The material of vibration damping unit 3 needs to have high deformation stiffness.

[0037] The metal oscillator 31 can be made of steel, and the elastic element 32 can be made of silicone rubber. Under external load, because the elastic modulus of the elastic element 32 is less than that of the metal oscillator 31, the metal oscillator 31 will undergo deformations such as translation and torsion. Figure 5 As shown. External load energy is stored in the damping unit 3 in the form of kinetic and deformation energy of the metal oscillator 31, thus generating a bandgap in the frequency domain. Due to the unique structure of the metal oscillator 31, the damping unit 3 has different energy storage methods under external loads, which gives the damping unit 3 a variety of bandgap widths, such as... Figure 6 As shown. From Figure 6 It can also be seen that the vibration isolator proposed in this invention has a good isolation effect on low-frequency vibrations and can isolate all vibrations below 500Hz.

[0038] Considering the special structure of the vibration isolator, the following steps should be followed during the actual manufacturing process:

[0039] Metal oscillators 31 with channel steel of different sizes as the external U-shaped structure are made by filling the gaps between the channel steel of adjacent layers with silicone rubber to make vibration damping units 3.

[0040] Different material properties of silicone rubber are set to achieve a wider range of bandgap characteristics for vibration isolators;

[0041] Vibration damping units 3 are arranged in layers within the protective layer 5, and lead core columns 6 are arranged. Then, elastic damping filling layer 4 is poured in layers.

[0042] After the protective layer 5 is filled, the upper and lower cover plates 1 are added and connected by connecting bolts 2.

[0043] Due to its unique structure, the vibration isolator of the present invention allows the metal oscillator 31 to have different motion states, such as torsion, translation, and shear, thereby enabling the damping unit 3 to have more band gaps with different bandwidths. By changing the material properties of the elastic element 31, the band gap of the damping unit 3 can be controlled, thereby achieving the performance adjustability of the vibration isolator and enabling the vibration isolator to effectively attenuate vibrations covering a wider frequency range of high and low frequencies. By changing the volume of the lead core column 6, different initial yield forces and yield stiffnesses of the vibration isolator can be obtained. Under external loads, it can better filter vibration waves, isolate external vibrations, protect external structures, and improve the safety and stability of the structure.

[0044] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A vibration isolator with multiple bandgap characteristics, characterized in that, It includes two cover plates (1) on the top and bottom. The two cover plates (1) are connected and fixed by connecting bolts (2). Several damping units (3) are arranged between the two cover plates (1) and an elastic damping filling layer (4) is provided in the gap between the damping units (3). A protective layer (5) is provided around all the damping units (3) and the elastic damping filling layer (4) between the two cover plates (1). The vibration damping unit (3) includes several layers of metal oscillators (31) arranged sequentially from the inside to the outside. Elastic elements (32) are filled between the metal oscillators (31). The density of the metal oscillators (31) is greater than the density of the elastic elements (32), and the elastic modulus of the elastic elements (32) is less than the elastic modulus of the metal oscillators (31).

2. A vibration isolator with multiple bandgap characteristics according to claim 1, characterized in that, The innermost metal oscillator (31) has a cuboid structure, while the outermost metal oscillator (31) has a U-shaped structure.

3. A vibration isolator with multiple bandgap characteristics according to claim 2, characterized in that, Several lead core pillars (6) are evenly distributed between the two cover plates (1).

4. A vibration isolator with multiple bandgap characteristics according to claim 3, characterized in that, Two cover plates (1) have corresponding connecting holes (7) on both sides. Connecting bolts (2) are inserted into the corresponding connecting holes (7) of the two cover plates (1) and fixed by nuts (8).

5. A vibration isolator with multiple bandgap characteristics according to claim 4, characterized in that, The number of layers of the U-shaped metal oscillator (31) is not less than two.

6. A vibration isolator with multiple bandgap characteristics according to claim 5, characterized in that, The number of lead core pillars (6) is four.

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