CN107606041B - Hybrid damper formed by combining magneto-rheological damper and electric vortex damper - Google Patents
Hybrid damper formed by combining magneto-rheological damper and electric vortex damper Download PDFInfo
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- CN107606041B CN107606041B CN201711029167.0A CN201711029167A CN107606041B CN 107606041 B CN107606041 B CN 107606041B CN 201711029167 A CN201711029167 A CN 201711029167A CN 107606041 B CN107606041 B CN 107606041B
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Abstract
The invention discloses a hybrid damper formed by combining a magneto-rheological damper and an eddy current damper, which mainly comprises an outer ring magnetic conduction cylinder barrel, a permanent magnet, a magnetic isolation sheet, an inner ring magnetic isolation cylinder barrel, a fixed sleeve, a piston rod, an excitation coil, a piston head sleeve, a piston head and the like. The 8 permanent magnets and the 8 magnetism isolating sheets are fixedly arranged on the fixed sleeve and move together with the piston rod under external excitation. The permanent magnet moves in the outer ring magnetic conduction cylinder barrel, so that the magnetic flux flowing through the outer ring magnetic conduction cylinder barrel is changed, and an electric vortex is generated in the outer ring magnetic conduction cylinder barrel to counteract the change of the magnetic flux. The eddy current generates a magnetic field, and attractive force and repulsive force are generated between the permanent magnet and the outer ring magnetic conductive cylinder barrel, so that relative vibration damped in the object moving process is prevented. The invention combines the magneto-rheological damper and the eddy current damper to change the rigidity of the magneto-rheological damper under the same damping force, and is particularly suitable for semi-active vibration reduction systems adopting the magneto-rheological damper.
Description
Technical Field
The invention relates to a damper, in particular to a hybrid damper formed by combining a magneto-rheological damper and an eddy current damper.
Background
The vibration damper commonly used at present mainly comprises a passive control mode, an active control mode and a semi-active control mode. The vibration damper based on the passive control mode has simple structure, low cost and wide application, but damping and inherent frequency of the vibration damper are not adjustable, and a better vibration damping effect can be achieved only when the vibration of a vibrating object is in a certain range and the excitation frequency of the vibration damper is the same as or close to that of the vibration damper in the passive mode; when the natural frequency and the excitation frequency are greatly different, the vibration reduction effect is poor and even the vibration is deteriorated. The vibration absorber based on the active control mode monitors vibration conditions in real time through the sensor and feeds measured information back to the processor, and force is directly provided according to different vibration conditions to offset force generated by vibration; because real-time monitoring is needed, a certain time is needed for feedback implementation, the requirements on the sensor and the processing are high, and the external energy source is needed for supporting, so that the cost is high. The damper controlled by the semi-active mode is used for achieving the required damping effect by changing the damping characteristic of the damper by a specific method, and more external energy sources are not required to be consumed.
The magneto-rheological damper is a representation of a novel semi-active vibration damper, and can adjust the rheological property of magneto-rheological fluid in a damping gap according to an electromagnetic field so as to achieve the purpose of changing the output damping force. The conventional magneto-rheological damper cannot change the natural frequency of the damper, namely the rigidity of the damper, while changing the damping. In the traditional variable stiffness control system, the stiffness of the main body structure is variable according to different control programs by adjusting the variable stiffness device arranged between layers in real time, so that the self-vibration frequency of the structure is far away from the frequency of external excitation, and the purpose of reducing the vibration of the structure is achieved. The conventional spring-damper structure vibration reduction system can achieve the composite functions of variable damping and variable stiffness, but has limited application occasions due to oversized structure.
Patent ZL 200420032523.6 proposes an adjustable shock absorber for medium and high grade off-road vehicles and racing vehicles, which realizes the variable tensile damping force and spring stiffness of the shock absorber by artificially changing a spiral spring and related mechanical structures, thereby improving the vibration and impact of the road surfaces of different road conditions on the vehicles. However, in practice, manual adjustment of the mechanical structure by human is very inconvenient and not suitable for use in a mechanism that is always in operation. Patent ZL 201120292619.6 proposes a damping-adjustable front shock absorber for vehicles, which achieves the purpose of adjusting output damping force by artificially changing the conduction area of a liquid guide hole, but the rigidity of the damper cannot be automatically and continuously adjusted. Patent ZL 201110254088.6 proposes a single-rod magnetorheological damper which can effectively adjust the damping of the damper, but cannot change the rigidity of the damper at the same time.
In the existing industrial field damper, almost no continuous adjustable damping and rigidity can be realized at the same time. Based on the damping and rigidity continuously adjustable damper, the mechanical mechanism is reasonable and practical, and the damping and rigidity continuously adjustable damper has very important significance.
Disclosure of Invention
In order to solve the problems that the traditional magnetorheological damper is high in rigidity and cannot be adjusted in the background technology, the invention provides a hybrid damper formed by combining a magnetorheological damper and an eddy current damper. While conventional magneto-rheological damper and electric vortex damper are commonly used in different systems, the invention integrates the electric vortex damper and magneto-rheological damper to make them work cooperatively. In the structure of the eddy current damper, the permanent magnet group fixed on the fixed sleeve moves along with the piston rod under external excitation, and the permanent magnet group moves in the outer ring magnetic conduction cylinder barrel to change the magnetic flux flowing through the outer ring magnetic conduction cylinder barrel, so that eddy current is generated in the outer ring magnetic conduction cylinder barrel to counteract the change of the magnetic flux. The eddy current generates a magnetic field, and attractive force and repulsive force are generated between the permanent magnet and the outer ring magnetic conductive cylinder barrel, so that relative vibration damped in the object moving process is prevented. The invention reduces the rigidity of the magneto-rheological damper under the same damping force by combining the magneto-rheological damper and the eddy current damper, and is particularly suitable for being applied to a semi-active vibration reduction system adopting the magneto-rheological damper.
The technical scheme adopted by the invention for solving the technical problems comprises the following steps: the magnetic isolation device comprises a lower end cover (1), an outer ring magnetic conduction cylinder barrel (2), a fastening magnetic isolation armature (3), a permanent magnet (4), a magnetic isolation sheet (5), an inner ring magnetic isolation cylinder barrel (6), an upper end cover (7), a fixing sleeve (8), a piston rod (9), a fastening nut (10), a damper upper end cover (11), a piston head upper baffle plate (12), an excitation coil (13), a piston head sleeve (14), a piston head (15), a piston head lower baffle plate (16), a lock nut (17) and a damper lower end cover (18); the upper end cover (11) of the damper is fixedly connected with the inner ring magnetism isolating cylinder barrel (6) through a screw, the upper end cover (11) of the damper is in clearance fit with the inner surface of the inner ring magnetism isolating cylinder barrel (6), and the upper end cover and the inner ring magnetism isolating cylinder barrel are sealed through a sealing ring; a circular through hole is processed in the middle of the upper end cover (11) of the damper, the piston rod (9) is in clearance fit with the circular through hole in the middle of the upper end cover (11) of the damper, and the upper end cover and the piston rod are sealed through a sealing ring; the lower end of the piston rod (9) is provided with a shaft shoulder, a circular through hole is formed in the middle of the upper baffle (12) of the piston head, the outer surface of the lower end of the piston rod (9) is in clearance fit with the circular through hole of the upper baffle (12) of the piston head, and the shaft shoulder of the lower end of the piston rod (9) is in close contact with the upper end surface of the upper baffle (12) of the piston head; a circular through hole is processed in the middle of the piston head (15) and is in clearance fit with the outer surface of the lower end of the piston rod (9); the upper end surface of the piston head (15) is tightly contacted with the lower end surface of the upper baffle plate (12) of the piston head; the piston head (15) is provided with a circular groove for winding the exciting coil (13); the lower end surface of the piston head (15) is tightly contacted with the upper end surface of a lower baffle plate (16) of the piston head; a circular through hole is processed in the middle of the lower baffle (16) of the piston head, is in clearance fit with the outer surface of the lower end of the piston rod (9), and is locked and fixed through a locking nut (17); the radial clearance between the inner surface of the piston head sleeve (14) and the outer surface of the piston head (15) forms a magnetorheological fluid flow channel; the lower end of the piston head sleeve (14) is provided with a boss which is arranged in a lower baffle plate (16) of the piston head; the upper end of the piston head sleeve (14) is provided with a boss which is arranged in a groove of the upper baffle plate (12) of the piston head; the outer surface of the piston head sleeve (14) is in clearance fit with the inner ring magnetism isolating cylinder barrel (6) and is sealed by a sealing ring; the lower end face of the inner ring magnetism isolating cylinder barrel (6) is fixedly connected with the lower end cover (1) through a screw; a shoulder is processed on the outer side of the lower end part of the fixed sleeve (8); the annular permanent magnets (4) are placed in a mode that N poles are opposite to N poles and S poles are opposite to S poles, two permanent magnets (4) are separated by a magnetism isolating sheet (5), and 8 magnetism isolating sheets (5) and 8 permanent magnets (4) are sequentially arranged on a fixed sleeve (8) and are tightly pressed by fastening magnetism isolating armatures (3); the fastening magnetism isolating armature (3) is fixedly connected with the fixed sleeve (8) through a screw; when the external excitation is applied, the piston rod (9) axially reciprocates; simultaneously, the permanent magnet (4) fixed on the fixed sleeve (8) moves along with the piston rod (9) under external excitation, the permanent magnet (4) moves in the outer ring magnetic conduction cylinder barrel (2) to change the magnetic flux flowing through the outer ring magnetic conduction cylinder barrel (2), so that an eddy current is generated in the outer ring magnetic conduction cylinder barrel (2) to counteract the change of the magnetic flux; the eddy current generates a magnetic field, attractive force and repulsive force are generated between the permanent magnet (4) and the outer ring magnetic conduction sleeve (2), and damping relative vibration in the process of moving an object is prevented, so that the rigidity of the magnetorheological damper under the same damping force is changed; the inner surface of the upper end of the lower end cover (1) is provided with a circular groove, and the outer ring magnetic conduction cylinder barrel (2) is in interference fit with the circular groove at the upper end of the lower end cover (1); the lower end of the upper end cover (7) is provided with a circular groove, and the inner surfaces of the two ends of the groove are provided with internal threads; an external thread is processed on the outer surface of the upper end of the outer ring magnetic conduction cylinder barrel (2), and the outer ring magnetic conduction cylinder barrel are fixedly connected together through threads; the inner surface of the lower end cover (18) of the damper is in clearance fit with the outer surface of the lower end of the piston rod (9), and is sealed by a sealing ring; the inner surface of the lower end cover (18) of the damper is in clearance fit with the inner ring magnetism isolating cylinder barrel (6) and is sealed by a sealing ring; the damper lower end cover (18) and the lower end cover (1) are connected through screw fastening.
Compared with the background technology, the invention has the following beneficial effects:
(1) In the invention, the eddy current damper part adopts the annular permanent magnet and the magnetism isolating iron core, and the arrangement of each layer of annular permanent magnet adopts the Halbach magnet structure, so that the induction intensity of the magnetic field is enhanced; compared with other magnet arrangement modes, the magnetic field utilization rate is increased, the eddy current generating capacity is improved, and the rigidity adjusting range is enlarged.
(2) The invention combines the magneto-rheological damper and the eddy current damper, and the two dampers work in parallel. The eddy current is generated through the eddy current damper to reduce the rigidity of the magnetorheological damper, the required energy is small, the device is simple, and the control effect is obvious.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
FIG. 2 is a schematic view of the structure of the eddy current damper according to the invention.
Fig. 3 is an enlarged view of the P portion of fig. 2.
Fig. 4 is an enlarged view of the Q portion of fig. 2.
FIG. 5 is a schematic diagram of a magnetorheological damper in accordance with the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic structural diagram of the damper, and the damper comprises a lower end cover (1), an outer ring magnetic conduction cylinder barrel (2), a fastening magnetism isolating armature (3), a permanent magnet (4), magnetism isolating sheets (5), an inner ring magnetic isolation cylinder barrel (6), an upper end cover (7), a fixing sleeve (8), a piston rod (9), a fastening nut (10), a damper upper end cover (11), a piston head upper baffle plate (12), an exciting coil (13), a piston head sleeve (14), a piston head (15), a piston head lower baffle plate (16), a locking nut (17) and a damper lower end cover (18).
FIG. 2 is a schematic view of the structure of the eddy current damper according to the invention. The magnetic isolation device comprises a lower end cover (1), an outer ring magnetic conduction cylinder barrel (2), a fastening magnetic isolation armature (3), an annular permanent magnet (4), an annular magnetic isolation sheet (5), an upper end cover (7), a fixed sleeve (8), a movable piston rod (9), a fastening nut (10) and a damper lower end cover (18).
Fig. 3 is an enlarged view of the P portion of fig. 2. The annular permanent magnets (4) are placed in a mode that N poles are opposite to N poles and S poles are opposite to S poles, two permanent magnets (4) are separated by a magnetism isolating sheet (5), and 8 magnetism isolating sheets (5) and 8 permanent magnets (4) are sequentially arranged on a fixed sleeve (8) and are tightly pressed by fastening magnetism isolating armatures (3).
Fig. 4 is an enlarged view of a portion Q of fig. 2, showing distribution of magnetic lines of force in the eddy current damper.
FIG. 5 is a schematic diagram of a magnetorheological damper in accordance with the present invention. The magnetic-isolation piston comprises an inner ring magnetic-isolation cylinder barrel (6), a piston rod (9), an upper end cover (11), a piston head upper baffle plate (12), an exciting coil (13), a piston head sleeve (14), a piston head (15), a piston head lower baffle plate (16) and a locking nut (17). Two leads C1 and C2 of the exciting coil (13) sequentially pass through a lead hole (102) on a baffle plate (12) on the piston head and a lead hole (103) on the piston rod (9) by a lead groove (101) on the piston head (15) and are led out by a lead hole (104) on the piston rod (9); the magnetic force lines generated start from the magnetic core of the piston head (15), pass through the upper end of the piston head (15) and pass through the upper end effective damping gap to enter the piston head sleeve (14), then pass through the lower end effective damping gap to enter the lower end of the piston head (15), and finally return to the magnetic core of the piston head (15) to form a closed loop.
The working principle of the invention is as follows:
when the damper is externally excited, the piston rod reciprocates in the axial direction. Meanwhile, the permanent magnet fixed on the fixed sleeve moves along with the piston rod under external excitation, and the permanent magnet moves in the outer ring magnetic conduction cylinder barrel to change the magnetic flux flowing through the outer ring magnetic conduction cylinder barrel, so that an electric vortex is generated in the outer ring magnetic conduction cylinder barrel to counteract the change of the magnetic flux, the vortex generates a magnetic field, attractive force and repulsive force are generated between the permanent magnet and the outer ring magnetic conduction sleeve, and the relative vibration damped in the object moving process is prevented. The rigidity of the magnetorheological damper under the same damping force is changed by adopting a mode of combining the magnetorheological damper and the eddy current damper.
Claims (1)
1. A hybrid damper formed by combining a magneto-rheological damper and an eddy current damper is characterized by comprising the following components: the magnetic isolation device comprises a lower end cover (1), an outer ring magnetic conduction cylinder barrel (2), a fastening magnetic isolation armature (3), a permanent magnet (4), a magnetic isolation sheet (5), an inner ring magnetic isolation cylinder barrel (6), an upper end cover (7), a fixing sleeve (8), a piston rod (9), a fastening nut (10), a damper upper end cover (11), a piston head upper baffle plate (12), an excitation coil (13), a piston head sleeve (14), a piston head (15), a piston head lower baffle plate (16), a lock nut (17) and a damper lower end cover (18); the upper end cover (11) of the damper is fixedly connected with the inner ring magnetism isolating cylinder barrel (6) through a screw, the upper end cover (11) of the damper is in clearance fit with the inner surface of the inner ring magnetism isolating cylinder barrel (6), and the upper end cover and the inner ring magnetism isolating cylinder barrel are sealed through a sealing ring; a circular through hole is processed in the middle of the upper end cover (11) of the damper, the piston rod (9) is in clearance fit with the circular through hole in the middle of the upper end cover (11) of the damper, and the upper end cover and the piston rod are sealed through a sealing ring; the lower end of the piston rod (9) is provided with a shaft shoulder, a circular through hole is formed in the middle of the upper baffle (12) of the piston head, the outer surface of the lower end of the piston rod (9) is in clearance fit with the circular through hole of the upper baffle (12) of the piston head, and the shaft shoulder of the lower end of the piston rod (9) is in close contact with the upper end surface of the upper baffle (12) of the piston head; a circular through hole is processed in the middle of the piston head (15) and is in clearance fit with the outer surface of the lower end of the piston rod (9); the upper end surface of the piston head (15) is tightly contacted with the lower end surface of the upper baffle plate (12) of the piston head; the piston head (15) is provided with a circular groove for winding the exciting coil (13); the lower end surface of the piston head (15) is tightly contacted with the upper end surface of a lower baffle plate (16) of the piston head; a circular through hole is processed in the middle of the lower baffle (16) of the piston head, is in clearance fit with the outer surface of the lower end of the piston rod (9), and is locked and fixed through a locking nut (17); the radial clearance between the inner surface of the piston head sleeve (14) and the outer surface of the piston head (15) forms a magnetorheological fluid flow channel; the lower end of the piston head sleeve (14) is provided with a boss which is arranged in a lower baffle plate (16) of the piston head; the upper end of the piston head sleeve (14) is provided with a boss which is arranged in a groove of the upper baffle plate (12) of the piston head; the outer surface of the piston head sleeve (14) is in clearance fit with the inner ring magnetism isolating cylinder barrel (6) and is sealed by a sealing ring; the lower end face of the inner ring magnetism isolating cylinder barrel (6) is fixedly connected with the lower end cover (1) through a screw; a shoulder is processed on the outer side of the lower end part of the fixed sleeve (8); the annular permanent magnets (4) are placed in a mode that N poles are opposite to N poles and S poles are opposite to S poles, two permanent magnets (4) are separated by a magnetism isolating sheet (5), and 8 magnetism isolating sheets (5) and 8 permanent magnets (4) are sequentially arranged on a fixed sleeve (8) and are tightly pressed by fastening magnetism isolating armatures (3); the fastening magnetism isolating armature (3) is fixedly connected with the fixed sleeve (8) through a screw; when the external excitation is applied, the piston rod (9) axially reciprocates; simultaneously, the permanent magnet (4) fixed on the fixed sleeve (8) moves along with the piston rod (9) under external excitation, the permanent magnet (4) moves in the outer ring magnetic conduction cylinder barrel (2) to change the magnetic flux flowing through the outer ring magnetic conduction cylinder barrel (2), so that an eddy current is generated in the outer ring magnetic conduction cylinder barrel (2) to counteract the change of the magnetic flux; the eddy current generates a magnetic field, attractive force and repulsive force are generated between the permanent magnet (4) and the outer ring magnetic conduction cylinder barrel (2), and damping relative vibration in the process of moving an object is prevented, so that the rigidity of the magnetorheological damper under the same damping force is changed; the inner surface of the upper end of the lower end cover (1) is provided with a circular groove, and the outer ring magnetic conduction cylinder barrel (2) is in interference fit with the circular groove at the upper end of the lower end cover (1); the lower end of the upper end cover (7) is provided with a circular groove, and the inner surfaces of the two ends of the groove are provided with internal threads; an external thread is processed on the outer surface of the upper end of the outer ring magnetic conduction cylinder barrel (2), and the outer ring magnetic conduction cylinder barrel are fixedly connected together through threads; the inner surface of the lower end cover (18) of the damper is in clearance fit with the outer surface of the lower end of the piston rod (9), and is sealed by a sealing ring; the inner surface of the lower end cover (18) of the damper is in clearance fit with the inner ring magnetism isolating cylinder barrel (6) and is sealed by a sealing ring; the damper lower end cover (18) and the lower end cover (1) are connected through screw fastening.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711029167.0A CN107606041B (en) | 2017-10-29 | 2017-10-29 | Hybrid damper formed by combining magneto-rheological damper and electric vortex damper |
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| CN201711029167.0A CN107606041B (en) | 2017-10-29 | 2017-10-29 | Hybrid damper formed by combining magneto-rheological damper and electric vortex damper |
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| CN107606041B true CN107606041B (en) | 2023-06-09 |
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| CN109990038B (en) * | 2019-04-25 | 2020-08-07 | 武汉理工大学 | Multilayer decompression magnetorheological damper |
| CN111252106A (en) * | 2020-01-20 | 2020-06-09 | 中车株洲电力机车有限公司 | Railway vehicle and bogie thereof |
| CN112628342B (en) * | 2020-12-22 | 2022-04-08 | 南京林业大学 | Magneto-rheological damping vibration attenuation device based on permanent magnet and vibration attenuation method thereof |
| CN112855828B (en) * | 2020-12-30 | 2022-07-15 | 哈尔滨工业大学 | Shock absorption damper for high-pile wharf |
| CN113638514A (en) * | 2021-08-18 | 2021-11-12 | 武汉理工大学 | Semi-active tuned mass damper based on magnetorheological elastomer |
| CN113819184A (en) * | 2021-10-09 | 2021-12-21 | 浙江大学 | Electromagnetic damper and application thereof |
| CN114165557B (en) * | 2021-11-29 | 2024-02-02 | 安徽大学 | Active-semi-active composite vibration reduction system with negative stiffness characteristic |
| CN115045948A (en) * | 2022-05-31 | 2022-09-13 | 集美大学 | Dual loss reduction structure of magnetorheological fluid damper |
| CN116181833B (en) * | 2023-04-24 | 2023-08-29 | 中国科学技术大学 | Suspension device for passenger car |
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