CN112161016A

CN112161016A - Piston type impact buffering device based on magnetorheological elastomer particles

Info

Publication number: CN112161016A
Application number: CN202011000379.8A
Authority: CN
Inventors: 温明富; 李泽钦; 牛小东; 饶龙石; 王誉乔; 黎倩萍; 章诗婷; 张豪
Original assignee: Shantou University
Current assignee: Shantou University
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-01-01

Abstract

The invention discloses a piston type impact buffering device based on magnetorheological elastomer particles, which comprises: the cylinder body, the piston rod, the uide bushing, the end cover, the piston, magnetic current becomes elastomer granule, control scheme and controller, the cross-section is circular in the cylinder body, the end cover has been arranged to one end, the uide bushing has been arranged to the other end, uide bushing axis department has the through-hole, the piston rod stretches into inside the cylinder body through uide bushing axis through-hole, there is the through-hole passageway in order to arrange the control scheme piston rod axis department, the piston rod end-to-end connection is the piston, the piston comprises two sets of excitation coil and iron core, the piston external diameter is. The energy dissipation device provided by the invention provides a novel energy absorption and dissipation scheme by using controllable magnetorheological elastomer particles, and solves the technical problems that the traditional magnetorheological fluid damper cannot be completely sealed, particles are settled and failed, potential pollution is generated to the environment and the like.

Description

Piston type impact buffering device based on magnetorheological elastomer particles

Technical Field

The invention relates to a damper, in particular to a piston type impact buffering device based on magnetorheological elastomer particles.

Background

Dampers are important components of mechanical vibration control systems. The energy-absorbing and dissipative material used by the magnetorheological fluid damper is magnetorheological fluid, and the damping force of the magnetorheological fluid is changed by applying and controlling a magnetic field. The magnetorheological fluid damper has a simple structure and low energy consumption, can realize active or semi-active vibration control by changing a magnetic field and adjusting the damping force in real time, has wide application prospect in mechanical and civil engineering, and is an ideal form for replacing an oil damper at the present stage.

The existing magnetorheological fluid damper has the following obvious defects: the magnetorheological fluid is easy to generate particle sedimentation failure, sealing failure and complex device structure under the working condition of long-term use. Compared with the traditional magnetorheological fluid damper and a block-shaped magnetorheological elastomer damper, the piston type impact damper based on the magnetorheological elastomer particles has the advantages of larger damping stroke, better failure-safety performance, no particle sedimentation failure of damping materials, simple structure (such as no need of sealing and a valve control device) and the like, and can be used as a general device for vibration application of a high-efficiency controllable structure.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a piston-type impact buffering device based on magnetorheological elastomer particles. The problem of difficulty in sealing and leakage prevention of the magnetorheological fluid material can be solved, and the magnetorheological fluid sealing device is simple and compact in structure and durable in use.

In order to solve the technical problem, an embodiment of the present invention provides a piston-type impact buffering device based on magnetorheological elastomer particles, including a cylinder body, a piston rod, a guide sleeve, an end cover, a piston, magnetorheological elastomer particles, and an excitation member, where the magnetorheological elastomer particles are in millimeter order and are filled in the cylinder body, and the end cover and the guide sleeve are respectively disposed at two ends of the cylinder body; the piston rod extends into the cylinder body through a through hole at the axis of the guide sleeve and is fixedly connected with the piston, the excitation component is arranged on the piston, and a gap for forming a damping channel is formed between the piston and the inner wall of the cylinder body.

Wherein the excitation member is a permanent magnet.

Wherein the exciting member is an exciting coil.

Wherein, there is the passageway at the piston rod axis to arrange control circuit connection controller and excitation coil.

The cylinder body is made of soft magnetic materials with high magnetic conductivity, and the piston rod is made of non-ferromagnetic materials.

The magnetorheological elastomer particles are prepared by dispersing ferromagnetic particles with micron-sized sizes in a polymer elastomer to prepare millimeter-sized elastomer particles.

The embodiment of the invention has the following beneficial effects:

1. the damping material used by the piston type impact buffering device based on the magnetorheological elastomer particles is the magnetorheological elastomer particles, so that the problem of difficulty in sealing and leakage prevention of the magnetorheological elastomer material is solved, the structure is simple and compact, and the integral lightweight design is improved.

2. The damping material used by the piston type impact buffering device based on the magnetorheological elastomer particles is the magnetorheological elastomer particles, the problem that the magnetorheological elastomer material is easy to deteriorate and oxidize is solved, sealing is not needed, the requirement on oxidation resistance and pollution prevention is low, and the piston type impact buffering device based on the magnetorheological elastomer particles can be suitable for use conditions of high-temperature and high-pollution environments and severe environments.

3. The magnetorheological elastomer particles used in the piston-type impact buffer device based on the magnetorheological elastomer particles are millimeter-sized particles, so that the piston-type impact buffer device has the advantages of a particle damper and a magnetorheological fluid damper, and the damping force can be controlled by adjusting the current of the excitation coil.

4. The magnetorheological elastomer particles used by the piston-type impact buffering device based on the magnetorheological elastomer particles are millimeter-sized particles, so that passive damping control can be performed when a magnetic field is not applied, semi-active control can be realized when the magnetic field is applied, and the dynamic range of a damping force is expanded.

Drawings

FIG. 1 is a cross-sectional view of the overall structure of the apparatus of the present invention;

FIG. 2 is a partial view of a piston of the apparatus of the present invention;

FIG. 3 is a view of a damping channel of the apparatus of the present invention;

FIG. 4 is a schematic diagram of the positive stroke of the piston rod after energizing the field coil of the apparatus of the present invention;

FIG. 5 is a schematic view of the negative stroke of the piston rod after energizing the field coil of the apparatus of the present invention;

FIG. 6 is a schematic representation of magnetorheological elastomer particles of the apparatus of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 to 6, according to an embodiment of the present invention, a piston-type impact buffering device based on magnetorheological elastomer particles includes a cylinder 1, a piston rod 2, a guide sleeve 3, an end cover 6, a piston (an iron core 5, excitation coils 7 and 8), magnetorheological elastomer particles 4, a control circuit 9, and a controller 10.

The inner section of the cylinder body 1 is circular, the end cover 6 is arranged at one end of the cylinder body 1, the guide sleeve 3 is arranged at the other end of the cylinder body 1, a through hole is formed in the axis of the guide sleeve 3, and the piston rod 2 penetrates through the through hole in the axis of the guide sleeve 3. The piston is composed of the iron core 5 and the

excitation coils

7 and 8, and the piston is arranged at the tail end of the piston rod 2. The axis of the piston rod 2 is provided with a through hole channel, and the control circuit 9 is connected to the controller 10 outside the cylinder body 1 through the channel of the axis of the piston rod 2. The magnetorheological elastomer cylinder is characterized in that millimeter-sized magnetorheological elastomer particles 4 are arranged in the cylinder body 1, and the size of the magnetorheological elastomer particles 4 is far larger than the installation gaps between the end cover 6 and the cylinder body 1, between the guide sleeve 3 and the cylinder body 1, and between the guide sleeve 3 and the piston rod 2.

In an exemplary embodiment, referring to fig. 4 and 5, the piston is engaged to slide in the direction of the end cap 6 for a positive stroke and in the direction of the guide sleeve 3 for a negative stroke. Under the condition that the excitation coils 7 and 8 do not apply magnetic fields, the magnetic damping cylinder can be used as a particle damping buffer, and the magnetorheological elastomer particles 4 in the cylinder body 1 are squeezed and rubbed to play a role in buffering energy absorption.

In a specific embodiment, referring to fig. 3, 4 and 5, the damper can be converted into a semi-active control damper through the

excitation coils

7 and 8, the control circuit 9 and the controller 10, a magnetic field is generated around the piston, the magnetorheological elastomer particles in the forward and reverse stroke front area 12 of the piston mainly play a role in extruding and absorbing vibration and bearing large impact, and the elastic force, the friction force and the adsorption force among the magnetorheological elastomer particles play a role in buffering and absorbing energy. The magnetorheological elastomer particles in the damping channel 11 formed by the gap between the piston (iron core 5, magnet exciting coils 7 and 8) and the inner wall of the cylinder body 1 are extruded and sheared, and the generated friction force and adsorption force further increase the total damping force.

In some embodiments, the

field coils

7 and 8 can be replaced by two permanent magnets, applying a magnetic field of fixed strength, converting the present damper into a passive control damper.

In some embodiments, the number of turns of the

exciting coils

7 and 8 can be adjusted according to actual requirements, and the number of the exciting coils can also be increased or decreased according to actual requirements.

In some embodiments, the piston rod 2 or the guide sleeve 3 or the cylinder 1 may be provided with a displacement and speed sensor, and the exciting current of the

exciting coils

7 and 8 is changed through the controller 10 and the control circuit 9 according to the external impact to generate a magnetic field which changes according to the external impact, so as to realize the active control.

In some embodiments, the end cap 6 may be secured to the cylinder block 1 by welding or bolts or other means.

In some embodiments, the guide sleeve 3 may be fixed to the cylinder block 1 by welding or bolts or other means.

In some embodiments, the core 5 may be designed in different shapes to produce different damping force distributions when the magnetorheological elastomer particles 4 are pressed.

As shown in fig. 6, the magnetorheological elastomer particles 4 are elastomer particles with a millimeter size prepared by dispersing ferromagnetic particles with a micron size in a polymer elastomer.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A piston type impact buffering device based on magnetorheological elastomer particles is characterized by comprising a cylinder body, a piston rod, a guide sleeve, an end cover, a piston, the magnetorheological elastomer particles and an excitation component, wherein the magnetorheological elastomer particles are in millimeter level and are filled in the cylinder body, and the end cover and the guide sleeve are respectively arranged at two ends of the cylinder body; the piston rod extends into the cylinder body through a through hole at the axis of the guide sleeve and is fixedly connected with the piston, the excitation component is arranged on the piston, and a gap for forming a damping channel is formed between the piston and the inner wall of the cylinder body.

2. The piston-type impact mitigation device based on magnetorheological elastomer particles of claim 1, wherein the excitation member is a permanent magnet.

3. The piston-type impact-attenuation device based on magnetorheological elastomer particles of claim 1, wherein the excitation member is an excitation coil.

4. The piston-type impact buffering device based on magnetorheological elastomer particles according to claim 3, wherein a passage is formed at the axis of the piston rod to arrange a control line connecting the controller and the excitation coil.

5. The piston-type impact-cushioning device based on magnetorheological elastomer particles of claim 4, wherein the cylinder body is composed of a soft magnetic material of high magnetic permeability and the piston rod is composed of a non-ferromagnetic material.

6. The piston-type impact buffering device based on magnetorheological elastomer particles according to claim 2 or 4, wherein the magnetorheological elastomer particles are elastomer particles with a millimeter size prepared by dispersing ferromagnetic particles with micron size in a polymer elastomer.