Novel self-resetting vibration reduction and isolation device

Abstract

The novel self-resetting vibration reduction and isolation device comprises a piezoelectric upper cover, an inerter system is arranged at the lower end of the piezoelectric upper cover, a second permanent magnet is arranged at the lower end of the inerter system, and the piezoelectric upper cover is connected with the second permanent magnet through an elastic system; vibration of a building caused by different external acting forces can be flexibly dealt with through multi-stage energy consumption, the energy consumption effect is remarkable, the piezoelectric upper cover forms first-stage energy consumption, the inerter system and the elastic system form second-stage energy consumption, and the inerter system and the second permanent magnet form third-stage energy consumption; and meanwhile, the self-resetting vibration reduction and isolation device is cooperated and automatically reset through the elastic system and the acting force between the inerter system and the second permanent magnet, and the utilization rate of the vibration reduction and isolation device is increased.

Description

Technical Field

[0001] The invention relates to the technical field of energy dissipation and vibration reduction, and in particular to a novel self-resetting vibration isolator. Background Art

[0002] With the continuous progress of society and the rapid development of the economy, building vibration isolation technology has been widely used in the engineering field as an effective means to control subway environmental vibration. In order to improve the comfort and seismic safety of buildings under the influence of subway vibration, domestic and foreign scholars have successively researched and developed products such as vibration isolation bearings and vibration isolators, and these products have been widely used. However, these current vibration isolation bearings and products can only reduce the vibration caused by trains to subway roof buildings or buildings along rail transit lines, but cannot achieve effective shock absorption for the impact of earthquakes and other external loads on buildings. Therefore, there is an urgent need for a new type of self-resetting vibration isolator that can dissipate energy and reduce vibration in buildings under the action of various external forces.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a new type of self-resetting vibration isolator, which has the characteristics of self-resetting, light weight, wide vibration reduction frequency band, good robustness and high static and low dynamic, and has good application in energy dissipation and vibration isolation of building structures, transportation stations, terminals, and subway cover structures.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a novel self-resetting vibration isolator, comprising a piezoelectric upper cover, an inertia capacity system is arranged at the lower end of the piezoelectric upper cover, a second permanent magnet is arranged at the lower end of the inertia capacity system, and the piezoelectric upper cover and the second permanent magnet are connected through an elastic system.

[0007] Furthermore, the piezoelectric upper cover comprises a shell, and a top plate inside the shell is connected to the piezoelectric sheet.

[0008] Furthermore, the lower end of the piezoelectric upper cover is fixedly connected to the short rod, and the inertia system includes a sleeve, the upper end of the sleeve is sleeved on the short rod, and the lower end is sleeved on the upper end of the ball screw, the lower end of the ball screw is fixedly connected to the second permanent magnet, and the outer part of the sleeve is sleeved with a first permanent magnet coaxial with the first permanent magnet, and the first permanent magnet and the second permanent magnet have the same poles facing each other.

[0009] Furthermore, the second permanent magnet is filled with magnetorheological fluid.

[0010] Furthermore, the elastic system comprises a bracket, the lower end of the bracket is connected to the second permanent magnet, and the upper end of the bracket is connected to the piezoelectric upper cover via a spring.

[0011] Furthermore, electrorheological fluid is filled between the piezoelectric sheet and the bottom plate of the shell.

[0012] Furthermore, the sleeve is a graphite sleeve.

[0013] Furthermore, the spring is a memory alloy spring.

[0014] Furthermore, elastic systems are symmetrically arranged on both sides of the inertia volume system.

[0015] Furthermore, the bracket consists of a cross bar and an oblique bar, one end of the cross bar is connected to the second permanent magnet, and the other end is fixedly connected to one end of the oblique bar, and the end of the oblique bar away from the cross bar is connected to a spring, and the angle formed by the connection between the cross bar and the oblique bar is 120° to 160°.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The self-resetting vibration isolator of the present invention can flexibly respond to the vibration of the building caused by different external forces through multi-level energy consumption, and the energy consumption effect is remarkable, wherein the piezoelectric upper cover forms the first level of energy consumption, the inertia capacitance system and the elastic system form the second level of energy consumption, and the inertia capacitance system and the second permanent magnet form the third level of energy consumption;

[0018] (2) The self-resetting vibration isolator of the present invention is of a passive type, which can avoid the situation where active and semi-active devices fail due to power failure under large vibration, so it has a wide range of applications;

[0019] (3) The self-resetting vibration isolator of the present invention is reset automatically through the coordinated action between the elastic system and the inertia system and the second permanent magnet, thereby improving the utilization rate of the vibration isolator;

[0020] (4) The inertia system provided in the self-resetting vibration isolator of the present invention provides a greater inertia force without increasing the physical mass of the device, and has the advantage of being lighter than traditional vibration isolators;

[0021] (5) The inertia system of the self-resetting vibration isolator of the present invention interacts with the second permanent magnet to form a negative stiffness magnetic spring self-resetting system, which has the advantages of high static and low dynamic, and plays the role of energy dissipation;

[0022] (6) The inertia system and elastic system of the self-resetting vibration isolator of the present invention constitute the NES nonlinear energy hydrazine, which makes the vibration isolator applicable to both low and high frequencies, with a wide vibration reduction bandwidth and good robustness;

[0023] (7) The self-resetting vibration isolator of the present invention is simple to assemble while ensuring high energy consumption, and is easy to expand production and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the self-resetting vibration isolator of the present invention;

[0025] Reference numerals:

[0026] 1. Piezoelectric sheet, 2. Electrorheological fluid, 3. Sleeve, 4. Ball screw, 5. First permanent magnet, 6. Second permanent magnet, 7. Spring, 8. Bracket, 9. Outer cylinder, 10. Magnetorheological fluid, 11. Short rod. DETAILED DESCRIPTION

[0027] The embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the following description, specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] refer to Figure 1 This embodiment provides a new type of self-resetting vibration isolator, including a piezoelectric upper cover, a capacitive inertia system is arranged at the lower end of the piezoelectric upper cover, a second permanent magnet 6 is arranged at the lower end of the capacitive inertia system, and the piezoelectric upper cover and the second permanent magnet 6 are connected by an elastic system.

[0031] In this embodiment, after the piezoelectric upper cover is subjected to pressure, part of the kinetic energy can be converted into electrical energy through the piezoelectric effect, forming a primary energy consumption. During the up and down movement of the piezoelectric upper cover, the elastic system and the inertial capacitance system constitute a NES nonlinear energy hydrazine to expand the frequency range of vibration reduction and isolation, and at the same time form a secondary energy consumption. During the downward movement of the piezoelectric upper cover, the inertial capacitance system is driven to consume energy. At the same time, the inertial capacitance system acts on the second permanent magnet 6, and part of the kinetic energy of the inertial capacitance system is converted into magnetic field energy, thereby forming a tertiary energy consumption, wherein the magnetic field energy between the elastic system and the inertial capacitance system and the second permanent magnet 6 works together to actively reset the vibration reducer and isolator. This embodiment flexibly responds to the vibration of the building caused by different external forces through multi-stage energy consumption, and the energy consumption effect is significant. At the same time, it can reset autonomously and has a high utilization rate.

[0032] Furthermore, the piezoelectric upper cover includes a shell, and the top plate inside the shell is connected to the piezoelectric sheet 1. When the upper end of the shell is subjected to pressure, the piezoelectric sheet 1 converts kinetic energy into electrical energy through the piezoelectric effect, thereby achieving an energy consumption effect. In order to make the primary energy consumption effect better, an electrorheological fluid 2 can be filled between the piezoelectric sheet 1 and the bottom plate of the shell, that is, the piezoelectric sheet 1 and the electrorheological fluid 2 are connected in series. The electrorheological fluid 2 can undergo a liquid-solid transformation under the action of an electric field to dissipate energy.

[0033] Furthermore, the inertia system includes a sleeve 3, which is preferably a graphite sleeve. The sleeve 3 is connected to the lower end of the piezoelectric upper cover through a short rod 11. The upper end of the sleeve 3 is sleeved on the short rod 11, and the lower end is sleeved on the upper end of the ball screw 4. The lower end of the ball screw 4 is fixedly connected to the second permanent magnet 6. The outer part of the sleeve 3 is sleeved with a first permanent magnet 5 coaxial with it, and the first permanent magnet 5 and the second permanent magnet 6 have the same poles facing each other.

[0034] In this embodiment, after the piezoelectric upper cover is subjected to pressure, a part of the kinetic energy is converted into the elastic potential energy of the elastic system during the movement. When the piezoelectric upper cover moves downward until it contacts the upper end of the sleeve 3, it will drive the sleeve 3 downward. During the downward movement of the sleeve 3, the first permanent magnet 5 will be driven to rotate, thereby increasing the inertial force, improving the energy consumption efficiency, and forming a secondary energy consumption. During the secondary energy consumption process, the piezoelectric upper cover can be regarded as a counterweight mass block, which forms a NES nonlinear energy hydrazine with the elastic system and the sleeve 3, thereby expanding the frequency range of vibration reduction and isolation; during the downward movement of the sleeve 3, the first permanent magnet 5 will be driven downward, changing the distance between the first permanent magnet 5 and the second permanent magnet 6, and converting a part of the kinetic energy into magnetic field energy, thereby forming a tertiary energy consumption; after the piezoelectric upper cover moves downward, the elastic system can prompt the piezoelectric upper cover to actively move. Reset, since the first permanent magnet 5 and the second permanent magnet 6 have the same poles facing each other, after the first permanent magnet 5 moves downward, the repulsive force of the second permanent magnet 6 on the first permanent magnet 5 causes the first permanent magnet 6 to rotate upward and reset, that is, the elastic system and the second permanent magnet 6 cooperate to cause the vibration reducer to reset actively; in this embodiment, the plug-in length of the short rod 11 and the ball screw 4 and the sleeve 3 can be determined according to design requirements, so as to ensure that the short rod 11 and the ball screw 4 and the sleeve 3 of the vibration reducer will not be separated during operation. In order to make the three-level energy dissipation effect better, the second permanent magnet 6 is filled with magnetorheological fluid 10, and the magnetic field strength between the first permanent magnet 5 and the second permanent magnet 6 changes with the change of the distance between the two. The magnetorheological fluid 10 will undergo mutual transformation between liquid and solid, thereby increasing energy dissipation.

[0035] Furthermore, the elastic system includes a bracket 8, the lower end of the bracket 8 is connected to the second permanent magnet 6, and the upper end of the bracket 8 is connected to the piezoelectric upper cover through a spring 7. In order to ensure the reset effect and energy dissipation effect of the spring 7, the spring 7 is preferably a memory alloy spring; in order to make the inertia effect of the inertia system better, the first permanent magnet 5 is slightly larger than the second permanent magnet 6;

[0036] Furthermore, the bracket 8 is composed of a cross bar and an oblique bar, one end of the cross bar is connected to the second permanent magnet 6, and the other end is fixedly connected to one end of the oblique bar, and the end of the oblique bar away from the cross bar is connected to the spring 8. The angle formed by the connection between the cross bar and the oblique bar is 120°~160°, which can ensure that the space where the first permanent magnet 5 is located is larger.

[0037] Furthermore, in the above embodiment, the new self-resetting vibration isolator is covered with an outer tube 9 on the outside, which can protect the internal vibration isolator and also play a supporting role. The elastic system can be evenly arranged on the outside of the inertial system according to needs, for example, the elastic system is symmetrically arranged on both sides of the inertial system.

[0038] Although the present invention has been described in detail in this specification by means of general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto on the basis of the present invention. Therefore, these modifications or improvements made without departing from the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A new type of self-resetting vibration isolator, characterized in that: It comprises a piezoelectric upper cover, the lower end of which is provided with an inertia capacitance system, the lower end of which is provided with a second permanent magnet (6), and the piezoelectric upper cover and the second permanent magnet (6) are connected via an elastic system.

2. A novel self-resetting vibration isolator according to claim 1, characterized in that: The piezoelectric upper cover comprises a shell, and a top plate inside the shell is connected to the piezoelectric sheet (1).

3. A novel self-resetting vibration isolator according to claim 1, characterized in that: The lower end of the piezoelectric upper cover is fixedly connected to the short rod (11), and the inertia system includes a sleeve (3), the upper end of the sleeve (3) is sleeved on the short rod (11), and the lower end is sleeved on the upper end of the ball screw (4), the lower end of the ball screw (4) is fixedly connected to the second permanent magnet (6), and the outer part of the sleeve (3) is sleeved with a first permanent magnet (5) coaxial with the first permanent magnet (5), and the first permanent magnet (5) and the second permanent magnet (6) have the same poles facing each other.

4. A novel self-resetting vibration isolator according to claim 1, characterized in that: The second permanent magnet (6) contains a magnetorheological fluid (10).

5. The novel self-resetting vibration isolator according to claim 1 is characterized in that: The elastic system comprises a bracket (8), the lower end of the bracket (8) is connected to the second permanent magnet (6), and the upper end of the bracket (8) is connected to the piezoelectric upper cover via a spring (7).

6. A novel self-resetting vibration isolator according to claim 2, characterized in that: Electrorheological fluid (2) is filled between the piezoelectric sheet and the bottom plate of the housing.

7. The novel self-resetting vibration isolator according to claim 3 is characterized in that: The sleeve (3) is a graphite sleeve.

8. The novel self-resetting vibration isolator according to claim 5 is characterized in that: The spring (7) is a memory alloy spring.

9. The novel self-resetting vibration isolator according to claim 1 is characterized in that: Elastic systems are symmetrically arranged on both sides of the inertia system.

10. The novel self-resetting vibration isolator according to claim 5 is characterized in that: The bracket (8) is composed of a cross bar and an inclined bar, one end of the cross bar is connected to the second permanent magnet (6), and the other end is fixedly connected to one end of the inclined bar, and the end of the inclined bar away from the cross bar is connected to the spring (7), and the angle formed by the connection between the cross bar and the inclined bar is 120° to 160°.

Images