CN113431863A - Damping self-adaptive tuning magnetorheological damper - Google Patents
Damping self-adaptive tuning magnetorheological damper Download PDFInfo
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- CN113431863A CN113431863A CN202110435769.6A CN202110435769A CN113431863A CN 113431863 A CN113431863 A CN 113431863A CN 202110435769 A CN202110435769 A CN 202110435769A CN 113431863 A CN113431863 A CN 113431863A
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- magnetorheological
- cylinder wall
- flow channel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/06—Magnetic or electromagnetic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/04—Fluids
- F16F2224/045—Fluids magnetorheological
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention relates to a damping self-adaptive tuning magnetorheological damper, which is used for realizing the self-adaptive adjustment of magnetorheological damping parameters under the condition of constant current. Compared with the prior art, the magnetorheological damper has the advantages of no need of a feedback control system, simple structure, convenience in implementation, capability of ensuring the self-adaptive adjustment of parameters of the magnetorheological damper and improving the output efficiency, and has important significance for the damping and wind-resistant design of building structures in high-intensity areas and strong typhoon areas.
Description
Technical Field
The invention relates to the field of structural design of magnetorheological dampers, in particular to a damping self-adaptive tuning magnetorheological damper.
Background
The damper is a conventional component widely applied to the fields of buildings, machinery, automobiles, aviation, military industry and the like at present, wherein the magnetorheological damper has the advantages of small volume, low energy consumption, large damping force, wide dynamic range, high frequency response, large adaptation range and the like, and has wide application prospect in the field of intelligent structures.
The design of the magneto-rheological damper widely used at present is based on the change of the rheological property of the magneto-rheological fluid under the action of an external magnetic field, and because the change of the current in the excitation coil relates to a feedback control system, the real-time regulation and control mode is complicated, the application and the development of the magneto-rheological damper are restricted, and the self-adaptive regulation of the magneto-rheological damping parameter under the condition of constant current cannot be realized.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a damping adaptive tuning magnetorheological damper.
The purpose of the invention can be realized by the following technical scheme:
a damping self-adaptive tuning magnetorheological damper is used for realizing self-adaptive adjustment of magnetorheological damping parameters under the condition of constant current, and comprises a cylinder filled with magnetorheological fluid, a piston valve arranged in the cylinder and a piston rod connected to the left side and the right side of the piston valve and extending out of the cylinder, wherein an excitation coil is wound on the piston valve, an annular gap is arranged between the outer surface of the piston valve and the inner wall of the cylinder and serves as a fluid flow channel, the inner diameter of the cylinder wall of the cylinder is respectively in multi-stage reduction change from the center to the left side and the right side, so that the area of the fluid flow channel is gradually reduced, and the restoring force model parameters of the magnetorheological damper are gradually increased under the action of the magnetic field of the excitation coil.
The cylinder barrel is composed of a first-stage barrel wall, two second-stage barrel walls and two third-stage barrel walls from the center to the left side and the right side in sequence.
The inner wall of the first-stage cylinder wall is connected with the inner wall of the second-stage cylinder wall in a sudden change mode.
The connection part of the inner wall of the first-stage cylinder wall and the inner wall of the second-stage cylinder wall is connected in a gradual change mode, so that structural damage caused by sudden loading generated in the moment of increasing the damping force is avoided.
A first-stage liquid flow channel is arranged between the first-stage cylinder wall and the outer surface of the piston valve, a second-stage liquid flow channel is arranged between the second-stage cylinder wall and the outer surface of the piston valve, a third-stage liquid flow channel is arranged between the third-stage cylinder wall and the outer surface of the piston valve, the height of the second-stage liquid flow channel is integral multiple of that of the first-stage liquid flow channel, and the height of the third-stage liquid flow channel is integral multiple of that of the first-stage liquid flow channel.
The piston valve, the piston rod and the cylinder walls at all levels are coaxially arranged, and the diameters of the piston valve and the piston rod are smaller than the inner diameter of the cylinder wall at the smallest level.
The piston valve and the piston rod are both made of low-carbon steel with the magnetic conductivity larger than 100.
Epoxy resin is adopted at the contact interface of the magnet exciting coil and the magnetorheological fluid to prevent magnetic leakage and corrosion of the magnet exciting coil.
The cylinder wall of the cylinder barrel is made of steel with the relative magnetic conductivity less than 1.0 and the relative electric conductivity more than 50.
The magnetorheological fluid is made of a material with the viscosity of 0.1Pa/s, and the specific model is Lord MRF-132 DG.
Compared with the prior art, the invention has the following advantages:
firstly, the implementation is simple and convenient: the self-adaptive magnetorheological damper control system does not need to be provided with a feedback control system like the traditional magnetorheological damper, does not need to change the current of the magnet exciting coil in real time, and can realize the self-adaptive adjustment of the magnetorheological damping parameters only by electrifying the normal current.
Secondly, the energy consumption performance is good: due to the adoption of the design of the inner diameter of the multi-stage cylinder wall, enough damping force can be provided under the condition of normal current, and the energy consumption performance is good.
Thirdly, the adaptability is strong: the inner diameter of the damper cylinder can be flexibly changed according to the output requirement of the magnetorheological damper, the corresponding piston stroke range can be designed according to the actual condition, and the applicability is strong.
Fourthly, saving space: compared with the existing magnetorheological damper, the current adjusting device and device are reduced, and the space is saved during arrangement.
Fifthly, stable performance: and because a passive mode without a feedback control system is adopted, the performance of the damper is stable.
Sixthly, stable output force: the piston valve is made of a high-permeability material, the relative permeability is over 100 so as to provide enough magnetic field intensity, the end sealing material and the cylinder barrel are made of a low-permeability material so as to prevent magnetic leakage and ensure the stable output of the damper.
The invention has important practical value for solving the technical problems of damping and wind resistance design of building structures in high-intensity areas and strong typhoon areas.
Drawings
FIG. 1 is a schematic diagram of the interior of the components of a damping adaptive tuning magnetorheological damper of the present invention.
Fig. 2 is a sectional view taken along line I-I in fig. 1.
Fig. 3 is a schematic diagram of the mechanism of the piston valve.
Fig. 4 is a schematic view of the main structure of the present invention.
Fig. 5 is a structural diagram of the wall of the cylinder with three-level thickness variation.
The notation in the figure is:
1. the piston valve 2, the magnet exciting coil 3, the epoxy resin 4, the liquid flow channel 5, the cylinder wall 6, the first-stage cylinder wall 7, the second-stage cylinder wall 8 and the third-stage cylinder wall.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
The invention provides a damping adaptive tuning magnetorheological damper, which realizes the adaptive adjustment of magnetorheological damping parameters under the condition of constant current by modifying the width of a liquid flow channel, breaks through the technical bottleneck of the existing feedback control system-based magnetorheological damping parameter adjustment, obviously reduces the cost and widens the application range, and has important significance for the damping and wind resistance design of building structures in high-intensity areas and strong typhoon areas.
As shown in fig. 1 and 4, the invention provides a damping adaptive tuning magnetorheological damper, which comprises three cylinder walls at two sides, wherein the inner diameter of each cylinder wall is gradually reduced from the middle point of the longitudinal length to the two sides, the height of a liquid flow channel 4 between a piston valve 1 and the inner diameter of the cylinder wall is changed through the change of the inner diameter of each cylinder wall, the gap height of a first-stage liquid flow channel is integral multiple of the gap height of a second-stage liquid flow channel, and the gap height of a third-stage liquid flow channel is integral multiple of the gap height of the first-stage liquid flow channel, as shown in fig. 5;
the cylinder wall 5 is made of a material with weak magnetic conductivity and high electric conductivity, specifically, in the embodiment, a material with relative magnetic conductivity less than 1.0 and relative electric conductivity more than 50 is adopted, and preferably, a steel material with good cutting performance is adopted;
the contact interface of the magnet exciting coil 2 and the magnetorheological fluid is made of corrosion-resistant, leakage-resistant and high-strength materials, so that magnetic leakage and corrosion of the magnet exciting coil 2 are prevented, and the epoxy resin 3 is preferably adopted;
the piston valve 1 is made of a material with high magnetic permeability, specifically, a material with magnetic permeability of more than 100 in the present example, preferably low-carbon steel, and the magnetorheological fluid is made of a material capable of quickly reacting to a magnetic field, and the viscosity of the magnetorheological fluid is about 0.1Pa/s in the present example, and Lord MRF-132DG is preferably selected.
As shown in fig. 2 and 3, the piston valve 1 is provided with an excitation coil 2 to provide a magnetic field, the liquid flow channel 4 is a gap between the piston valve 1 and the cylinder wall and is filled with magnetorheological fluid, the magnetorheological fluid passes through the gap when the damper works, the first-stage cylinder wall 6 is positioned in the middle of the damping adaptive tuning magnetorheological damper, and the inner diameter of the first-stage cylinder wall 6 changes abruptly at the left and right dividing points and enters the second-stage cylinder wall 7; the inner diameter of the second-stage cylinder wall 7 is suddenly changed at the next left and right dividing point and enters the third-stage cylinder wall 8, it needs to be noted that the inner diameter sudden change can be improved to be gradually changed in practical application so as to avoid structural damage caused by sudden loading generated in the moment of increasing the damping force, and the number of turns of the excitation coil 2 is increased as much as possible so as to ensure that enough magnetic induction intensity is achieved.
In the present embodiment, the piston valve 1 has a cylindrical shape; the first-stage cylinder wall 6, the second-stage cylinder wall 7 and the third-stage cylinder wall 8 are all in cylinder shapes corresponding to the designed liquid flow channel gap height, the components are coaxially arranged, the equal diameters of the piston valve 1 are respectively smaller than the corresponding inner diameters of the first-stage cylinder wall 6, the second-stage cylinder wall 7 and the third-stage cylinder wall 8, when the diameter, the cylinder wall thickness and the liquid flow channel gap height of the piston valve are designed, the output force of the damper is analyzed and the basic size of the magneto-rheological damper component is designed according to factors such as anti-seismic fortification standards or designed wind speeds in different regions, loads born by the damper and the like, the basic size of the magneto-rheological damper component is designed, and the basic size comprises the relative size of the inner diameters of the cylinder walls at all stages and the stroke range of the cylinder walls at all stages, so that enough damping force can be provided when the piston valve 1 moves.
The technical characteristics of the invention are further explained by adopting a magnetorheological damping force formula derived by a Bingham flat model and combining the attached drawings and set example parameters thereof.
The parameters of the specific embodiment of the damping adaptive tuning magnetorheological damper are set as follows:
(1) the outer diameter of the cylinder wall is 220mm, the inner diameter of the first-stage cylinder wall is 196mm, the inner diameter of the second-stage cylinder wall is 194mm, the inner diameter of the third-stage cylinder wall is 192mm, the diameter of a piston valve is 190mm, the length of the piston valve is 400mm, the diameter of a piston rod is 80mm, the thickness of each stage of cylinder wall is 12mm, 13mm and 14mm respectively, and the gap height of each stage of liquid flow channel is 3mm, 2mm and 1mm respectively;
(2) the piston strokes of the first-stage, second-stage and third-stage cylinder walls are all 800 mm;
(3) the magnet exciting coil and the magnetorheological fluid are sealed by epoxy resin, and the shear yield strength of the magnetorheological fluid is set to be 30 kPa.
It should be noted that the damping force derived by using the Bingham flat model formula includes two terms, namely viscous damping force and coulomb force, and since the magnitude of the viscous damping force is about one hundredth of the magnitude of the coulomb force, in the output estimation of the magnetorheological damper of the embodiment, the influence of the viscous damping force is not considered, and through calculation, the damping force generated by the first-stage cylinder wall is about 280kN, the damping force generated by the second-stage cylinder wall is about 420kN, and the damping force generated by the third-stage cylinder wall is about 840 kN.
In conclusion, the damper has the technical advantages of simplicity and convenience in implementation, good energy consumption performance, strong adaptability, space saving, stable performance and the like, overcomes the bottleneck that the traditional magnetorheological damper is complex in implementation and low in efficiency, and is suitable for damping and wind resistance design of building structures in high-intensity areas and strong typhoon areas. Meanwhile, the invention is convenient to be combined with assembly type buildings and intelligent construction, and has obvious engineering application value.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (10)
1. A damping self-adaptive tuning magnetorheological damper is used for realizing self-adaptive adjustment of magnetorheological damping parameters under the condition of constant current, and comprises a cylinder filled with magnetorheological fluid, a piston valve (1) arranged in the cylinder and piston rods connected to the left side and the right side of the piston valve (1) and extending out of the cylinder, wherein an excitation coil (2) is wound on the piston valve (1), and the damper is characterized in that an annular gap is arranged between the outer surface of the piston valve (1) and the inner wall of the cylinder and serves as a liquid flow channel, the inner diameter of the cylinder wall of the cylinder is respectively reduced in multiple stages from the center to the left side and the right side, so that the area of the liquid flow channel is gradually reduced, and the model parameters of the magnetorheological damper are gradually increased under the action of the magnetic field of the excitation coil.
2. The damper self-adaptive tuning magnetorheological damper according to claim 1, wherein the cylinder barrel consists of a first-stage cylinder wall (6), two second-stage cylinder walls (7) and two third-stage cylinder walls (8) from the center to the left and right sides in sequence.
3. The damper self-adaptive tuning magnetorheological damper according to claim 2, wherein the joint of the inner wall of the first-stage cylinder wall (6) and the inner wall of the second-stage cylinder wall (7) is connected in an abrupt change manner.
4. The damper self-adaptive tuning magnetorheological damper according to claim 2, wherein the connection between the inner wall of the first-stage cylinder wall (6) and the inner wall of the second-stage cylinder wall (7) is gradually changed to avoid structural damage caused by sudden loading generated at the moment of increasing damping force.
5. The damper self-adaptive tuning magnetorheological damper according to claim 1, wherein a first-stage liquid flow channel is arranged between the first-stage cylinder wall (6) and the outer surface of the piston valve (1), a second-stage liquid flow channel is arranged between the second-stage cylinder wall (7) and the outer surface of the piston valve (1), a third-stage liquid flow channel is arranged between the third-stage cylinder wall (8) and the outer surface of the piston valve (1), the height of the second-stage liquid flow channel is integral multiple of the height of the first-stage liquid flow channel, and the height of the third-stage liquid flow channel is integral multiple of the height of the first-stage liquid flow channel.
6. The damper self-adaptive tuning magnetorheological damper according to claim 1, wherein the piston valve (1), the piston rod and the cylinder walls of each stage are coaxially arranged, and the diameters of the piston valve (1) and the piston rod are smaller than the inner diameter of the cylinder wall of the smallest stage.
7. A damped adaptive tuning magnetorheological damper according to claim 1, wherein the piston valve (1) and the piston rod are made of low carbon steel with a permeability of more than 100.
8. A damped adaptive tuning magnetorheological damper according to claim 1, wherein epoxy resin is used at the contact interface of the excitation coil (2) and the magnetorheological fluid to prevent magnetic leakage and excitation coil corrosion.
9. The damping adaptive tuning magnetorheological damper according to claim 1, wherein the cylinder wall is made of steel with a relative magnetic permeability of less than 1.0 and a relative electric conductivity of more than 50.
10. The damping adaptive tuning magnetorheological damper according to claim 1, wherein the magnetorheological fluid is made of a material with a viscosity of 0.1Pa/s, and the specific model is Lord MRF-132 DG.
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| CN202110435769.6A CN113431863B (en) | 2021-04-22 | 2021-04-22 | Damping self-adaptive tuning magnetorheological damper |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877006A (en) * | 2022-04-07 | 2022-08-09 | 深圳市朝上科技有限责任公司 | Magnetorheological damper formed by stepped piston cylinder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877006A (en) * | 2022-04-07 | 2022-08-09 | 深圳市朝上科技有限责任公司 | Magnetorheological damper formed by stepped piston cylinder |
| WO2023193286A1 (en) * | 2022-04-07 | 2023-10-12 | 深圳市朝上科技有限责任公司 | Magnetorheological damper composed of stepped piston cylinder |
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| CN113431863B (en) | 2022-09-16 |
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