CN112128291A - Distributed viscous damping energy consumption device and energy consumption method - Google Patents

Abstract

The invention discloses a distributed viscous damping energy dissipation device and a working method thereof. The device is composed of an outer sleeve, a porous energy dissipation support and a force transmission rod. Among them, the outer sleeve is filled with viscoelastic fluid, and the porous energy dissipation support is arranged in the outer sleeve and is immersed in the fluid, and there is a middle partition, which makes the two parts of the porous energy dissipation support separate when the dowel rod is stressed. The deformation is caused by the tensile pressure, and then the holes provided in the porous energy dissipating support produce volume changes, thereby inhaling and extruding the viscoelastic fluid to dissipate energy. The device realizes distributed viscous energy dissipation by generating viscoelastic fluid flow through the massive holes located in the porous energy dissipation support, and has the advantages of small volume, large output, strong energy dissipation capacity, simple manufacture and adjustable stiffness, which is beneficial to energy dissipation. Industrial applications of shock absorption technology.

Description

Distributed viscous damping energy dissipation device and energy dissipation method

technical field

The invention mainly relates to the field of structural vibration control, in particular to a distributed viscous damping energy dissipation device and an energy dissipation method.

Background technique

Energy dissipation technology is a popular vibration control technology. In particular, viscous energy dissipators are widely used in vibration control in many fields such as machinery, aviation, and ships due to their simple structure, no maintenance, and long service life. high-rise buildings in earthquake-prone areas.

However, the traditional viscous damper has large volume and mass, limited damping energy consumption performance, and often has the problem of oil leakage, which is the key bottleneck for its popularization and application. How to increase the output of the viscous energy dissipator and improve its energy dissipation capacity is one of the problems that experts and scholars in the field of vibration control continue to study.

Existing literature explores the method of connecting multiple viscous fluid dampers in series and parallel, and using multiple chambers to generate viscoelastic flow simultaneously to improve the output and energy consumption performance of viscous fluid dampers, but the structure is complicated and the performance improvement is limited; The device utilizes a large number of preset holes in the material, combined with the negative Poisson phenomenon, and uses a simple structure to generate a large amount of liquid flow, which can significantly reduce the energy dissipation capacity of the damper and further promote the engineering application of viscous dampers.

SUMMARY OF THE INVENTION

In view of the above technical problems, the present invention provides a distributed viscous damping energy dissipation device and an energy dissipation method. Through the massive holes in the energy dissipation support, combined with the negative Poisson phenomenon, a large number of simultaneous viscous energy dissipation liquid flows are realized. The device can effectively reduce the volume and mass of the energy dissipation and shock absorption device, improve the performance of the device, and promote the engineering application of energy dissipation and shock absorption technology.

In order to realize above-mentioned technical purpose, the present invention adopts following technical scheme:

A distributed viscous damping energy dissipation device, comprising:

The outer sleeve is provided with openings at the upper and lower ends;

The lower end plate is sealed and fixedly connected with the opening at the lower end of the outer sleeve;

The upper end plate is sealed and fixedly connected with the opening at the upper end of the outer sleeve;

A sealing chamber is formed in the outer sleeve between the lower end plate and the upper end plate, and the sealing chamber is filled with viscoelastic fluid;

a middle baffle, which is arranged in the sealing chamber and can move relative to the inner wall of the cylinder of the outer sleeve in the sealing chamber with the middle baffle;

The porous energy dissipation support is arranged in the sealed chamber and immersed in the viscoelastic fluid, and is divided into two parts symmetrically arranged up and down by the middle partition plate, which are respectively located on the upper surface and the upper end of the middle partition plate a first porous energy dissipation support between the lower surface of the plate and a second porous energy dissipation support located between the lower surface of the middle partition plate and the upper surface of the lower end plate;

The inside of the matrix of the porous energy dissipation support is provided with holes arranged through the matrix. When the dowel rod is squeezed, the porous energy dissipation support deforms so that the holes extrude or inhale the viscoelastic fluid, and the viscoelasticity is utilized. Shear friction in fluid flow dissipates device deformation energy.

The first porous energy-dissipating support includes a plurality of first energy-dissipating support units, and the plurality of first energy-dissipating support units are evenly and symmetrically arranged on the outer sleeve axis between the upper surface of the middle partition and the lower surface of the upper end plate;

The second porous energy-dissipating support includes a plurality of second energy-dissipating support units, and the plurality of second energy-dissipating support units are evenly and symmetrically arranged on the axis of the outer sleeve between the lower surface of the middle partition plate and the upper surface of the lower end plate.

The upper end plate and the outer sleeve, and the lower end plate and the outer sleeve are all connected by threaded sealing; the force transmission rod and the upper end plate are connected by sliding sealing, and relative movement occurs when external force is applied.

The material of the porous energy dissipation support is metal, plastic or nylon.

The average diameter of the holes on the porous energy dissipation support is between 1 and 10mm. The center is flush along the horizontal and vertical directions of the energy-dissipating support, and is equally spaced into several rows and columns. The long sides of the adjacent holes in each row and column are perpendicular to each other, and are periodically staggered in the energy-dissipating support. The negative Poisson phenomenon is generated, which improves the overall volume change rate of the hole under force and realizes high-efficiency energy consumption.

A sliding and sealing connection is made between the middle partition plate and the inner wall of the cylinder of the outer sleeve, and a plurality of through holes are distributed along the circumferential direction on the middle partition plate.

The invention further discloses an energy dissipation method based on the distributed viscous damping energy dissipation device,

When the force transmission rod of the device and the outer sleeve are displaced due to the vibration of the external structure, the energy is dissipated by the following methods:

First, when the porous energy dissipation support is deformed, the massive holes inside the porous energy dissipation support change. Shear friction during flow dissipates the vibrational energy of the upper body structure.

The invention further discloses an energy dissipation method based on the distributed viscous damping energy dissipation device,

When the force transmission rod of the device and the outer sleeve are displaced due to the vibration of the external structure, the energy is dissipated by the following methods:

Second, when the device is subjected to force, the volume of the chambers located on the upper and lower sides of the middle partition in the sealed chamber changes. Combined with the porous energy dissipation support, the internal holes change, so that the chambers located on the upper and lower sides of the middle partition change. The internal pressure of the viscoelastic fluid is different, and it passes through the preset through holes in the middle partition plate to dissipate the vibration energy.

For different external vibration excitation frequencies, by presetting hole groups with different pore size distributions on the porous energy dissipation support, the flow velocity and friction force of the viscoelastic fluid in the holes are regulated, resulting in richer nonlinear stiffness damping characteristics. Optimize the efficiency to suppress the vibration of the main structure.

Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

1. The present invention generates viscoelastic fluid flow and friction damping energy dissipation through a large number of preset holes distributed in the energy dissipation support, and uses a simple and lightweight structure to simultaneously generate a significant viscoelastic fluid flow in the massive holes, which greatly improves the performance of the device. Damping output and energy dissipation capacity.

2. The present invention makes the support material produce a negative Poisson phenomenon by adjusting the distribution position pattern of the holes in the energy-consuming support, so that the cross-section of the support expands when it is stretched, and the cross-section shrinks when it is compressed, so as to maximize the change in the volume of the holes and promote the internal adhesion of the device. Elastomeric fluid flow dissipates energy.

3. The present invention regulates the flow velocity and frictional force of the viscoelastic fluid in the holes by presetting the hole groups with different pore size distributions, and can generate more abundant nonlinear stiffness damping characteristics for different external vibration excitation frequencies, and optimize the main body of the effect reduction and suppression. Structural vibration.

4. The present invention adjusts the force transmission path of the device, so that the volume contraction and expansion of the two chambers supported by the middle partition plate are opposite to the volume contraction and expansion of the holes in the energy dissipation support, and the internal flow of the viscoelastic fluid in the same chamber is used to maintain the chamber hydraulic pressure. Relatively constant, reducing device sealing performance requirements.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the device of the present invention,

Among them, 1 is the outer sleeve, 21 is the lower end plate, 22 is the porous energy dissipation support, 23 is the middle partition plate, 24 is the upper end plate,

3 is the dowel rod;

Figure 2 is a perspective view of the device of the present invention after assembly;

Figure 3 is a detailed view of the porous energy dissipation support,

Among them, 221 is a hole, 231 is a through hole, and 241 is a hole set on the upper end plate;

Fig. 4 is the front view of the porous energy dissipation support of the present invention;

Fig. 5 is the side view of the porous energy dissipation support of the present invention;

FIG. 6 is a top view of the porous energy dissipating support of the present invention.

Detailed ways

In order to facilitate the understanding of the structure of the present invention, the following description is made with reference to the accompanying drawings and embodiments.

As shown in Figures 1 and 2, the device consists of an outer sleeve 1, a porous energy dissipation support 2 and a dowel rod 3; wherein, the upper and lower ends of the outer sleeve 1 are provided with threads, filled with viscoelastic fluid material, and the porous energy dissipation Corresponding threads are provided on the outside of the upper and lower end plates to support

The outer sleeve 1 is connected with the upper and lower end plates through threads, and is filled with viscoelastic fluid. The porous energy dissipation support is immersed in the fluid. It is divided into upper and lower symmetrical parts by the middle partition plate 23. The support 22 is respectively connected with the middle partition plate 23 and the upper and lower end plates, the middle partition plate 23 is provided with through holes 231 , and the porous energy dissipation support 22 is provided with a large number of holes 221 .

As a specific embodiment of the present invention, the outer sleeve 1 is made of Q345 steel, the outer diameter of the cylinder 1 is 300mm, the thickness is 20mm, and the upper and lower ends of the cylinder are provided with ntp 1/4 thread.

The porous energy dissipation support 2 is made of nylon 6 material by plastic molding or additive manufacturing, wherein the diameter of the upper and lower end plates is 260mm respectively, and the outer edge has a corresponding ntp 1/4 thread;

The diameter of the middle partition plate is 255mm, wherein, there are 8 through holes distributed along the circumferential direction, the diameter of the through holes is 5mm, and the middle partition plate has threaded holes with a diameter of 30mm.

In this embodiment, the porous energy dissipating supports are 8 rectangular porous energy dissipating supports distributed along the circumferential direction, the cross-sectional size of the rectangular porous energy dissipating supports is 50mm*50mm, and there are through holes inside, and the shape distribution of the holes is shown in Figure 4 shown.

The power transmission rod 3 is made of Q345a steel, the lower end is connected with the inner threaded hole of the middle partition plate through threads, and the upper part is connected with the main structure.

The present invention is an energy dissipation method based on the distributed viscous damping energy dissipation device,

When the force transmission rod of the device and the outer sleeve are displaced due to the vibration of the external structure, the energy is dissipated by the following methods:

First, when the porous energy dissipation support is deformed, the massive holes inside the porous energy dissipation support change. Shear friction during flow dissipates the vibrational energy of the upper body structure.

When the force transmission rod of the device and the outer sleeve are displaced due to the vibration of the external structure, the energy is dissipated by the following methods:

Second, when the device is subjected to force, the volume of the chambers located on the upper and lower sides of the middle partition in the sealed chamber changes. Combined with the porous energy dissipation support, the internal holes change, so that the chambers located on the upper and lower sides of the middle partition change. The internal pressure of the viscoelastic fluid is different, and it passes through the preset through holes in the middle partition plate to dissipate the vibration energy.

For different external vibration excitation frequencies, by presetting hole groups with different pore size distributions on the porous energy dissipation support, the flow velocity and friction force of the viscoelastic fluid in the holes are regulated, resulting in richer nonlinear stiffness damping characteristics. Optimize the efficiency to suppress the vibration of the main structure.

Claims (9)

1. a distributed viscous damping energy dissipation device, is characterized in that, comprises: The outer sleeve is provided with openings at the upper and lower ends; The lower end plate is sealed and fixedly connected with the opening at the lower end of the outer sleeve; The upper end plate is sealed and fixedly connected with the opening at the upper end of the outer sleeve; A sealing chamber is formed in the outer sleeve between the lower end plate and the upper end plate, and the sealing chamber is filled with viscoelastic fluid; a middle baffle, which is arranged in the sealing chamber and can move relative to the inner wall of the cylinder of the outer sleeve in the sealing chamber with the middle baffle; a dowel rod, one end of which extends through the upper end plate into the sealing chamber and is fixedly connected with the middle partition plate, and the other end extends to the outside of the upper end plate; The porous energy dissipation support is arranged in the sealed chamber and immersed in the viscoelastic fluid, and is divided into two parts symmetrically arranged up and down by the middle partition plate, which are respectively located on the upper surface and the upper end of the middle partition plate a first porous energy dissipation support between the lower surface of the plate and a second porous energy dissipation support located between the lower surface of the middle partition plate and the upper surface of the lower end plate; The inside of the matrix of the porous energy dissipation support is provided with holes arranged through the matrix. When the dowel rod is squeezed, the porous energy dissipation support deforms so that the holes extrude or inhale the viscoelastic fluid, and the viscoelasticity is utilized. Shear friction in fluid flow dissipates device deformation energy. 2 . The distributed viscous damping energy dissipation device according to claim 1 , wherein the first porous energy dissipation support comprises a plurality of first energy dissipation support units, and the plurality of first energy dissipation support units are located in 2 . Between the upper surface of the middle partition and the lower surface of the upper end plate, the axis of the outer sleeve is evenly and symmetrically arranged; The second porous energy-dissipating support includes a plurality of second energy-dissipating support units, and the plurality of second energy-dissipating support units are evenly and symmetrically arranged on the axis of the outer sleeve between the lower surface of the middle partition plate and the upper surface of the lower end plate. 3 . The distributed viscous damping energy dissipation device according to claim 1 , wherein the upper end plate and the outer sleeve and between the lower end plate and the outer sleeve are all screw-sealed connections; There is a sliding and sealing connection between the force rod and the upper end plate, which can move relatively due to external force. 4. The distributed viscous damping energy dissipation device according to claim 1, wherein the material of the porous energy dissipation support is metal, plastic or nylon. 5. The distributed viscous damping energy dissipation device according to claim 1, wherein the average diameter of the holes on the porous energy dissipation support is between 1 and 10 mm, and the cross section is a flat shape such as peanut, spindle, ellipse, etc. The center of the hole is flush along the horizontal and vertical directions of the energy dissipation support, and is equally spaced into several rows and columns. The long sides of the adjacent holes in each row and column are perpendicular to each other, and are periodically staggered in the energy dissipation support, under tension and compression. The negative Poisson phenomenon is generated when the force is applied, and the overall volume change rate of the hole under force is improved to achieve high-efficiency energy consumption. 6 . The distributed viscous damping energy dissipation device according to claim 1 , wherein the middle partition plate and the inner wall of the cylinder of the outer sleeve are slidably and sealedly connected, and the middle partition plate is edged along the inner wall of the outer sleeve. 7 . A plurality of through holes are distributed in the circumferential direction. 7. An energy dissipation method based on the distributed viscous damping energy dissipation device described in any one of claims 1 to 5, characterized in that, When the force transmission rod of the device and the outer sleeve are displaced due to the vibration of the external structure, the energy is dissipated by the following methods: First, when the porous energy dissipation support is deformed, the massive holes inside the porous energy dissipation support change. Shear friction during flow dissipates the vibrational energy of the upper body structure. 8. An energy dissipation method based on the distributed viscous damping energy dissipation device according to claim 6, characterized in that, When the force transmission rod of the device and the outer sleeve are displaced due to the vibration of the external structure, the energy is dissipated by the following methods: Second, when the device is stressed, the volume of the chambers located on the upper and lower sides of the middle partition in the sealed chamber changes. Combined with the porous energy dissipation support, the volume of the internal holes changes, so that the chambers located on the upper and lower sides of the middle partition change. The internal pressure of the viscoelastic fluid in the chamber is different, and it passes through the preset through holes in the middle partition plate to dissipate the vibration energy. 9. The energy dissipation method of the distributed viscous damping energy dissipation device according to claim 7, wherein, For different external vibration excitation frequencies, by presetting hole groups with different pore size distributions on the porous energy dissipation support, the flow velocity and friction force of the viscoelastic fluid in the holes are regulated, resulting in richer nonlinear stiffness damping characteristics. Optimize the efficiency to suppress the vibration of the main structure.

Images