CN115789160A - Magnetorheological hydraulic inertial volume damper and control method thereof - Google Patents
Magnetorheological hydraulic inertial volume damper and control method thereof Download PDFInfo
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- 239000012530 fluid Substances 0.000 claims abstract description 39
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- 230000000694 effects Effects 0.000 claims abstract description 11
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- 230000009467 reduction Effects 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 3
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- 239000006249 magnetic particle Substances 0.000 abstract description 3
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- 239000000725 suspension Substances 0.000 description 2
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Abstract
The invention provides a magnetorheological hydraulic inertial volume damper and a control method thereof, wherein the magnetorheological hydraulic inertial volume damper comprises an end cover, an outer cylinder, an inner cylinder, a core cylinder, an outer magnet exciting coil, an inner magnet exciting coil, a piston, magnetorheological fluid and a piston rod; the outer barrel, the inner barrel, the core barrel, the piston and the piston rod are coaxially arranged, and two ends of the outer barrel are fixed to the end covers respectively. The scheme utilizes the inertia effect generated by the flow of the magnetorheological fluid in the spiral pipeline and controls the magnetic field intensity of the outer magnet exciting coil to enable magnetic particles in the magnetorheological fluid to be polarized and arranged to change the cross section area of the spiral pipeline, thereby realizing stepless adjustment of the inertia capacity; meanwhile, the damping is controlled in real time by utilizing the reversible magneto-rheological property of the magneto-rheological fluid in the inner cylinder under the action of the magnetic field of the inner excitation coil; the intelligent control combined with the dynamic cooperation of inertia capacity and damping and the coordination optimization improves the vibration damping performance of the structure and the self-adaptive capacity to the working environment, and the device has a simple structure and is beneficial to engineering application.
Description
Technical Field
The invention relates to the technical field of structural vibration reduction control, in particular to a magnetorheological hydraulic inertial volume damper and a control method thereof.
Background
The dynamic response of the civil engineering structure under the action of external loads such as wind, earthquake and the like can influence the service performance of the structure, and the severe vibration can also endanger the safety of the structure. Dampers have been widely studied and applied as an effective means for structural damping control. In recent years, a inertial volume damper has been studied and practiced in the fields of automobiles, machinery, and civil engineering as a new type of vibration damping device. Inerter is a mass element with two independent, free-moving end points, whose output force is proportional to the relative acceleration between its two end points (the proportionality coefficient is the inertance coefficient). The inerter can generate an inerter coefficient which is far larger than the physical mass of the inerter, and the structural physical mass is not changed basically. The inertia container and the damper are combined, so that high-efficiency structural energy consumption and vibration reduction can be realized by using an inertia mass amplification effect.
The existing passive inertial volume damper does not have the function of continuously and dynamically adjusting the damping coefficient and the inertial volume coefficient, lacks the self-adaptive control capability on the change of the dynamic characteristics of the structure and limits the vibration reduction performance of the inertial volume damper. The magneto-rheological damper only realizes semi-active control of damping which is controllable in real time by utilizing the continuous, reversible and rapid magneto-rheological property of the magneto-rheological fluid under the action of an external magnetic field. In order to realize the adjustment of the inertia capacity coefficient, in patent CN 103644248A, the inertia effect of magnetorheological fluid flowing in the elongated tube without an external magnetic field is utilized, and the on-off of the elongated tubes with different tube diameters is controlled by a switch valve to adjust the inertia capacity coefficient in a graded manner, but continuous stepless adjustment of the inertia capacity cannot be realized. Patent CN109630597A combines passive ball to be used to container and magnetorheological suspensions, utilizes the change of magnetorheological suspensions viscosity under the magnetic field effect to influence the rotatory moment of torsion that produces of flywheel to change and be used to the capacity coefficient, but the continuous regulation of being used to hold needs to be realized with the help of power compensation mechanism, and the device design is complicated with the use, is unfavorable for engineering application. With the research, development and application of the semi-active vibration control theory and technology to meet the ever-increasing vibration reduction demand, a novel semi-active magneto-rheological inertia capacity damper capable of continuously changing inertia capacity and damping in real time needs to be developed in engineering.
Disclosure of Invention
In view of this, the invention aims to provide a magnetorheological hydraulic inertial volume damper and a control method thereof, so that the variable inertial volume and variable damping combined coordination intelligent control is realized, the mechanical structure of the inertial volume damper is simplified, the adaptive capacity of the inertial volume damper to the working environment is enhanced, and the vibration reduction control performance is effectively improved.
In order to realize the purpose, the invention adopts the following technical scheme: a magneto-rheological hydraulic inerter damper comprises an end cover, an outer cylinder, an inner cylinder, a core cylinder, an outer excitation coil, an inner excitation coil, a piston, magneto-rheological liquid and a piston rod; the outer barrel, the inner barrel, the core barrel, the piston and the piston rod are coaxially arranged, and two ends of the outer barrel are fixed to the end covers respectively.
In a preferred embodiment, the inner cylinder and the two end covers form a closed cavity, and magnetorheological fluid is filled in the closed cavity.
In a preferred embodiment, the piston is disposed in the inner barrel, the piston dividing the inner barrel into two chambers; the outer wall of the piston is provided with a first annular groove, and an inner excitation coil is wound in the first annular groove; an annular throttling channel for magnetorheological fluid to flow is formed between the outer wall of the piston and the inner wall of the inner cylinder; two ends of the piston are respectively fixed with one end of each of the two piston rods, and the other ends of the two piston rods respectively extend out of two ends of the inner cylinder through the end covers.
In a preferred embodiment, the outer wall of the core barrel is recessed inwards in the radial direction to form a second annular groove, and an outer excitation coil is installed in the second annular groove; the inner wall of the core barrel is inwards sunken along the radial direction to form a spiral groove, and the core barrel and the inner barrel are installed in a gapless fit mode to form a spiral pipeline for flowing magnetorheological fluid.
In a preferred embodiment, the wall of the inner cylinder near the end is respectively provided with two through holes which are respectively and directly connected with the head and the tail of the spiral pipeline to communicate the spiral pipeline and the inner cavity of the inner cylinder, so that the magnetorheological fluid circularly flows between the inner cylinder and the spiral pipeline.
The invention also provides a control method of the magneto-rheological hydraulic inertia capacity damper, which controls the magneto-rheological hydraulic inertia capacity damper, the inertia capacity damper is arranged on the structure, when the structure vibrates under the action of external excitation, the vibration sensor senses the vibration of the structure, a feedback signal is generated and input into the controller, the controller calculates a control force according to the feedback signal, the control current is determined based on the dynamic matching and coordination optimization of the inertia capacity and the damping, the control current is respectively output to the outer excitation coil and the inner excitation coil, the inner and outer magnetic field intensity is changed, the magneto-rheological effect is adjusted, the dynamic combination coordination control of the inertia capacity and the damping is realized, and the purpose of efficient vibration reduction of the structure is achieved.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the encapsulation of the flowing inertia of the magnetorheological fluid is realized through the flowing of the magnetorheological fluid in the spiral pipeline, and meanwhile, the continuous dynamic adjustment of the inertia capacity is realized by utilizing the magnetorheological effect, so that the defect that the traditional mechanical inertia container cannot adjust the inertia capacity on line is overcome, and the performance of the inertia container is further improved.
2. The semi-active magneto-rheological hydraulic inertia capacity damper realizes real-time double control of inertia capacity and damping, overcomes the defect that the magneto-rheological damper can only dynamically adjust the damping by using the inertia capacity principle, improves the energy consumption capability of the damper and the self-adaptive control capability of the damper on the change of the structural dynamic characteristic, and realizes structural vibration reduction and efficiency improvement.
3. The inertial volume and the damping are respectively and independently controlled by different excitation coils, and intelligent control of dynamic matching and coordinated optimization of the inertial volume and the damping can be implemented, so that the control of the damper is more accurate and effective, and the working range is wider.
4. The invention has simple and compact structure, high reliability, less energy consumption and convenient installation and use, and is more favorable for engineering application.
Drawings
FIG. 1 is a schematic structural diagram of a magnetorheological hydrodynamic inertial volume damper according to a preferred embodiment of the present invention.
In the figure: 1-end cap; 2-outer cylinder; 3-inner cylinder; 4-a core barrel; 5-an outer field coil; 6-inner excitation coil; 7-a piston; 8-a helical pipe; 9-magnetorheological fluid; 10-piston rod.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, 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 application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application; as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in figure 1, the magneto-rheological hydraulic inertial volume damper is composed of an end cover 1, an outer cylinder 2, an inner cylinder 3, a core cylinder 4, an outer excitation coil 5, an inner excitation coil 6, a piston 7, magneto-rheological liquid 9 and a piston rod 10. The outer cylinder 2, the inner cylinder 3, the core cylinder 4, the piston 7 and the piston rod 10 are coaxially arranged, and two ends of the outer cylinder 2 are respectively fixed with the end cover 1.
The inner cylinder 3 and the two end covers 1 form a closed cavity, and magnetorheological fluid 9 is filled in the closed cavity. The piston 7 is arranged in the inner cylinder 3 and divides the inner cylinder 3 into two chambers; an annular groove is formed in the outer wall of the piston 7, and an inner excitation coil 6 is wound in the groove; an annular throttling channel for magnetorheological fluid 9 to flow is formed between the outer wall of the piston 7 and the inner wall of the inner cylinder 3; two ends of the piston 7 are respectively fixed with one ends of two piston rods 10, and the other ends of the two piston rods 10 respectively extend out of two ends of the inner cylinder 3 through the end covers 1.
The outer wall of the core barrel 4 is inwards sunken along the radial direction to form an annular groove, and an outer excitation coil 5 is arranged in the groove; the inner wall of the core barrel 4 is inwards sunken along the radial direction to form a spiral groove, and the core barrel 4 and the inner barrel 3 are installed in a gapless fit mode to form a spiral pipeline 8 through which magnetorheological fluid 9 flows.
Two through holes are formed in the inner cylinder 3 close to the cylinder walls at the two ends and are directly connected with the head end and the tail end of the spiral pipeline 8 respectively to communicate the spiral pipeline 8 with the inner cavity of the inner cylinder 3, so that the magnetorheological fluid 9 circularly flows between the inner cylinder 3 and the spiral pipeline 8.
The principle of the invention is as follows: the real-time dynamic adjustment of the damping is realized by utilizing the continuous, reversible and rapid magneto-rheological property of the magneto-rheological fluid under the action of an external magnetic field and changing the mechanical property of the magneto-rheological fluid by controlling the magnetic field intensity in the inner cylinder 3. Meanwhile, the magnetorheological fluid has low viscosity and high density without an external magnetic field, and shows a remarkable inertia effect when flowing in the spiral pipeline 8; when a magnetic field is applied to the magnetorheological fluid in the spiral pipeline 8, the suspended magnetic particles in the magnetorheological fluid are polarized and are arranged and gathered, and the cross section area of the spiral pipeline is changed, so that the aim of continuously, real-timely and steplessly adjusting the inertial volume is fulfilled.
The magneto-rheological hydraulic inertial volume damper is of a double-output-rod structure, an energy accumulator does not need to be configured, and the structure is simple. The end cover 1, the inner cylinder 3, the inner magnet exciting coil 6, the piston 7, the magnetorheological fluid 9 and the piston rod 10 jointly form a unit for implementing a damping function. When the piston rod 10 is connected with the external structure, the vibration of the external structure drives the piston 7 and the inner cylinder 3 to relatively slide through the piston rod 10, magnetorheological fluid 9 in the cavity of the inner cylinder 3 flows through the annular throttling channel under the pushing of the piston 7, a magnetorheological effect in a flowing mode is formed under the action of a magnetic field generated by the inner excitation coil 6, and the size of the magnetic field intensity is controlled by the electrified current of the inner excitation coil 6, so that the dynamic adjustment and the real-time control of the damping are realized.
In this embodiment, the spiral pipe 8, the outer excitation coil 5, and the magnetorheological fluid 9 formed by the inner cylinder 3 and the core cylinder 4 in cooperation constitute a unit for realizing variable inertial volume. The spiral pipeline 8 is communicated with the inner cylinder 3, and the magnetorheological fluid 9 flowing in the inner cylinder 3 circularly flows between the spiral pipeline 8 and the two chambers of the inner cylinder 3 through the through hole on the wall of the inner cylinder 3. The magnetorheological fluid 9 stores a large amount of kinetic energy while flowing in the spiral pipe 8, thereby generating an inertial force, which can be calculated by the following formula:
in the formula, b is an inertia capacity coefficient, a is the acceleration of the piston relative to the inner cylinder, rho is the density of the magnetorheological fluid, L is the length of the spiral pipeline, A 1 For the actual working area of the piston, A 2 The cross section area of the spiral pipeline is shown, and m is the mass of the magnetorheological fluid in the spiral pipeline. According to the formula, the ratio of the inertia force to the mass of the magnetorheological fluid flowing in the spiral pipeline is proportional to the square of the ratio of the actual working area of the piston to the cross-sectional area of the spiral pipeline; the inertia capacity coefficient is in direct proportion to the density of the magnetorheological fluid, the length of the spiral pipeline and the actual working area of the piston and in inverse proportion to the cross sectional area of the spiral pipeline. Because the density of the magnetorheological fluid is larger, and the actual working area of the piston is much larger than the cross-sectional area of the spiral pipeline, the inertia capacity coefficient of the magnetorheological inertia capacity damper is very large, which is equivalent to the amplification of the mass of the magnetorheological fluid in the spiral pipeline, and when the magnetorheological fluid flows in the spiral pipeline, a remarkable inertia effect is generated. Under the action of a magnetic field generated by the external excitation coil, suspended magnetic particles of magnetorheological fluid in the spiral pipeline are polarized and arranged and gathered, so that the pipe diameter of the spiral pipeline is changed, namely the cross-sectional area of the spiral pipeline is changed, and the aim of changing the inertia capacity is fulfilled.
In this embodiment, the outer excitation coil 5 and the inner excitation coil 6 may be independently powered and respectively connected to an external power supply circuit or a controllable current source. By controlling the magnitude of the electrified current, the strength of the magneto-rheological effect is adjusted by changing the magnetic field intensity, and the continuous adjustment and real-time control of the inertia capacitance and the damping are realized.
The invention also provides a control method for the magnetorheological hydraulic inertial volume damper, the inertial volume damper is arranged on a structure, when the structure vibrates under the action of external excitation, the vibration sensor senses the structure vibration to generate a feedback signal and input the feedback signal to a controller, the controller calculates a control force according to the feedback signal, determines the magnitude of a control current based on the dynamic matching and coordination optimization of the inertial volume and the damping, respectively outputs the control current to the outer magnet exciting coil 5 and the inner magnet exciting coil 6 to change the intensity of the inner magnetic field and the outer magnetic field and adjust the magnetorheological effect, realizes the dynamic combined coordination control of the variable inertial volume and the variable damping, and achieves the purpose of efficient vibration reduction of the structure.
While the present invention has been described with reference to specific embodiments and illustrative embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention. The present invention is not intended to be limited to the specific embodiments disclosed herein, but other embodiments falling within the scope of the appended claims are intended to be within the scope of the present invention.
Claims (6)
1. A magneto-rheological hydraulic inertial volume damper is characterized by comprising an end cover, an outer cylinder, an inner cylinder, a core cylinder, an outer excitation coil, an inner excitation coil, a piston, magneto-rheological liquid and a piston rod; the outer barrel, the inner barrel, the core barrel, the piston and the piston rod are coaxially arranged, and two ends of the outer barrel are fixed to the end covers respectively.
2. The magnetorheological hydrodynamic inertial container damper according to claim 1, wherein the inner cylinder and the two end covers form a closed cavity filled with magnetorheological fluid.
3. The magnetorheological hydrodynamic inertial volume damper of claim 1, wherein the piston is disposed in the inner cylinder, the piston dividing the inner cylinder into two chambers; the outer wall of the piston is provided with a first annular groove, and an inner excitation coil is wound in the first annular groove; an annular throttling channel for magnetorheological fluid to flow is formed between the outer wall of the piston and the inner wall of the inner cylinder; two ends of the piston are respectively fixed with one end of each of the two piston rods, and the other ends of the two piston rods respectively extend out of two ends of the inner barrel through the end covers.
4. The magnetorheological hydrodynamic inertial mass damper according to claim 1, wherein the outer wall of the core barrel is recessed radially inwards to form a second annular groove, and an outer excitation coil is arranged in the second annular groove; the inner wall of the core barrel is inwards sunken along the radial direction to form a spiral groove, and the core barrel and the inner barrel are installed in a gapless fit mode to form a spiral pipeline for flowing magnetorheological fluid.
5. The magnetorheological hydraulic inertial container damper according to claim 4, wherein the wall of the inner cylinder near the end is provided with two through holes respectively, and the two through holes are directly connected with the head and tail ports of the spiral pipeline respectively to communicate the spiral pipeline with the inner cavity of the inner cylinder, so that the magnetorheological fluid circularly flows between the inner cylinder and the spiral pipeline.
6. A control method of a magneto-rheological hydraulic inertia damper is characterized in that the damper is installed on a structure, when the structure vibrates under the action of external excitation, a vibration sensor is used for sensing the vibration of the structure, a feedback signal is generated and input to the controller, the controller calculates a control force according to the feedback signal, the magnitude of a control current is determined based on dynamic matching and coordination optimization of the inertia and damping and is respectively output to an outer excitation coil and an inner excitation coil, the intensity of the inner magnetic field and the outer magnetic field is changed, the magneto-rheological effect is adjusted, dynamic combination coordination control of the inertia and the damping is realized, and the purpose of efficient vibration reduction of the structure is achieved.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040195062A1 (en) * | 2003-04-04 | 2004-10-07 | Rod Millen Special Vehicles, Inc. | Magnetorheological damper system |
| JP2006273225A (en) * | 2005-03-30 | 2006-10-12 | Honda Motor Co Ltd | Controlling device for adjustable damping force damper |
| JP2014194253A (en) * | 2013-03-29 | 2014-10-09 | Sanwa Tekki Corp | Damping force variable hydraulic vibration control device |
| CN107448536A (en) * | 2017-09-19 | 2017-12-08 | 福州大学 | Sensing magnetic rheological liquid damper and its control method certainly of a kind of recoverable energy |
| CN108050196A (en) * | 2017-11-28 | 2018-05-18 | 江苏大学 | A kind of used case of multitube connection |
| CN110388403A (en) * | 2019-07-17 | 2019-10-29 | 重庆大学 | Binary channels becomes used and holds variable damping damper |
| CN111236722A (en) * | 2020-01-20 | 2020-06-05 | 同济大学 | Limit damper with variable inertial volume |
| CN112594320A (en) * | 2020-12-02 | 2021-04-02 | 江苏大学 | Inertial volume and magnetorheological damping fusion type suspension vibration damping mechanism |
-
2022
- 2022-11-24 CN CN202211487961.0A patent/CN115789160B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040195062A1 (en) * | 2003-04-04 | 2004-10-07 | Rod Millen Special Vehicles, Inc. | Magnetorheological damper system |
| JP2006273225A (en) * | 2005-03-30 | 2006-10-12 | Honda Motor Co Ltd | Controlling device for adjustable damping force damper |
| JP2014194253A (en) * | 2013-03-29 | 2014-10-09 | Sanwa Tekki Corp | Damping force variable hydraulic vibration control device |
| CN107448536A (en) * | 2017-09-19 | 2017-12-08 | 福州大学 | Sensing magnetic rheological liquid damper and its control method certainly of a kind of recoverable energy |
| CN108050196A (en) * | 2017-11-28 | 2018-05-18 | 江苏大学 | A kind of used case of multitube connection |
| CN110388403A (en) * | 2019-07-17 | 2019-10-29 | 重庆大学 | Binary channels becomes used and holds variable damping damper |
| CN111236722A (en) * | 2020-01-20 | 2020-06-05 | 同济大学 | Limit damper with variable inertial volume |
| CN112594320A (en) * | 2020-12-02 | 2021-04-02 | 江苏大学 | Inertial volume and magnetorheological damping fusion type suspension vibration damping mechanism |
Non-Patent Citations (1)
| Title |
|---|
| 潘公宇;潘秋华;: "用磁流变液阻尼可调减振器改善车辆座椅特性的研究", 工程机械, no. 10, 10 October 2007 (2007-10-10) * |
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