CN109630597B - Magneto-rheological inerter device and continuous adjusting method of inerter coefficient thereof - Google Patents
Magneto-rheological inerter device and continuous adjusting method of inerter coefficient thereof Download PDFInfo
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- CN109630597B CN109630597B CN201811602814.7A CN201811602814A CN109630597B CN 109630597 B CN109630597 B CN 109630597B CN 201811602814 A CN201811602814 A CN 201811602814A CN 109630597 B CN109630597 B CN 109630597B
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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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Abstract
The invention discloses a magneto-rheological inertial container device and a continuous adjusting method of an inertial container coefficient thereof, wherein the device consists of a magneto-rheological inertial container and a force compensation mechanism; the magnetorheological inertial container consists of a ball screw, a nut, a flywheel shell, a first coil, a first sealing ring, a second sealing ring, a first bearing, a second bearing, an upper end cover, a lower end cover and first magnetorheological fluid; the force compensation mechanism consists of a magneto-rheological damper and a motion converter; the magnetorheological damper consists of a piston rod, a piston, a second coil, a piston shell, an air bag, a first end cover, a second end cover, second magnetorheological fluid, a first copper ring, a second copper ring, a framework oil seal and a sealing ring; the motion converter is composed of a first rack, a second rack and a gear. The invention adopts the force compensation mechanism to enable the force generated at the two ends of the magnetorheological inertial container to be always in direct proportion to the relative acceleration at the two ends of the magnetorheological inertial container, thereby realizing the continuous adjustment of the inertial volume coefficient.
Description
Technical Field
The invention relates to an inerter device, in particular to a magnetorheological inerter device and a continuous adjusting method of an inerter coefficient thereof.
Technical Field
The aim of relieving unnecessary vibration in production and life is always to provide researchers with continuous effort, and the inerter serving as a novel vibration reduction element is firstly proposed in 2003. An inerter is a mass element that is movable at both ends, and the force generated is proportional to the relative acceleration at both ends, the proportionality coefficient being called the inertance coefficient, expressed in kilograms. The inerter can simulate larger 'virtual mass' with smaller mass per se, and the smaller structural size and mass make the inerter more favorable for engineering application compared with the traditional mass element. In 2005, inerter was first applied to the F1 race car, improving the maneuverability and tire grip of the race car. In 2006, a steering compensation device including an inerter was applied to a high-performance motorcycle, and steering performance of the motorcycle was improved. Thereafter, the application research of the inerter also relates to the fields of train suspensions, automobile suspensions, buildings, bridges and the like. Because the inertia capacity coefficient can not be adjusted, the vibration reduction frequency band of the passive inertia container is narrow, and the further improvement of the performance of the inertia container is hindered to a certain extent. In order to realize the adjustment of the inertial volume coefficient, researchers provide a mechanical adjustable inertial container, and the rotational inertia of a flywheel is changed by adjusting the position of a mass block, so that the adjustment of the inertial volume coefficient is realized. In addition, a hydraulic adjustable inerter is provided, and the inerter coefficient is adjusted in a grading manner by controlling a hydraulic valve. Although both of the two methods realize the adjustment of the inerter coefficient, the former has a slow adjustment speed, and the latter cannot realize continuous adjustment, thereby resulting in limited performance of the inerter.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a magnetorheological inertial volume device and a continuous adjusting method of an inertial volume coefficient thereof, so that the rapid adjustment of the inertial volume coefficient in a large range can be realized, and the performance of an inertial volume is improved.
The invention adopts the following technical scheme for solving the technical problems:
the invention discloses a magneto-rheological inertia capacity device which is characterized in that: the magnetorheological inertia container consists of a magnetorheological inertia container and a force compensation mechanism;
the magnetorheological inertial container consists of a ball screw, a nut, a flywheel shell, a first coil, a first sealing ring, a second sealing ring, a first bearing, a second bearing, an upper end cover, a lower end cover and first magnetorheological fluid;
the ball screw is fixed with the flywheel through the nut, and the flywheel and the nut are coaxially fixed; the first bearing and the second bearing are respectively arranged on the upper end surface and the lower end surface of the flywheel; the first bearing and the second bearing are respectively coaxially assembled with the upper end cover and the lower end cover and are used for forming a limiting structure for the axial movement of the flywheel; the flywheel is guaranteed to rotate, and meanwhile, the axial movement of the flywheel is limited;
the outer side of the flywheel is provided with the flywheel shell, and the first coil is wound in a T-shaped groove on the inner side of the flywheel shell; the first sealing ring is arranged in a gap between the outer side of the flywheel shell and the upper end of the flywheel, the second sealing ring is arranged between the flywheel shell and the lower end cover, an annular closed cavity is formed between the flywheel shell and the flywheel and between the first sealing ring and the second sealing ring, and first magnetorheological fluid is filled in the annular closed cavity; the flywheel shell is coaxially fixed with the upper end cover and the lower end cover;
the force compensation mechanism consists of a magneto-rheological damper and a motion converter; the magneto-rheological damper consists of a piston rod, a piston, a second coil, a piston shell, an air bag, a first end cover, a second end cover, second magneto-rheological fluid, a first copper ring, a second copper ring, a framework oil seal and a sealing ring;
the piston rod and the piston are coaxially fixed; the second coil passes through the inner through hole of the piston rod and is wound in the annular groove of the piston;
the piston shell is arranged on the outer side of the piston rod; the piston and the piston shell are always kept coaxial; the air bag is arranged at the bottom of the piston shell; the volume change generated in the process of the piston rod entering and exiting the piston shell is compensated;
the first end cover is arranged at the top of the piston shell; the second end cover is arranged at the top of the piston rod, and a sealing ring is arranged between the second end cover and the piston shell; the sealing performance in the piston shell is ensured; the first copper ring is arranged in the center of the first end cover, the second copper ring is arranged in the center of the second end cover, the first copper ring and the second copper ring are coaxially assembled with the piston rod respectively, and the framework oil seal is arranged between the first copper ring and the second copper ring; the magnetorheological fluid is coaxially assembled with the piston rod, so that the leakage of the magnetorheological fluid is avoided; sealed cavities are formed between the piston shell and the piston rod and between the second end cover and the air bag, and second magnetorheological fluid is filled in the sealed cavities;
one end of the piston rod is fixedly connected with one end of a ball screw in the magnetorheological inertial container through a connecting piece;
the motion converter consists of a first rack, a second rack and a gear; one end of the first rack is fixedly connected with the bottom of a piston shell of the magnetorheological damper; one end of the second rack is fixedly connected with one side of the lower end cover of the magnetorheological inertial container, and the gear is arranged between the first rack and the second rack.
The method for continuously adjusting the inertia capacity coefficient of the magnetorheological inertia capacity device is characterized by comprising the following steps of:
and 5, adjusting the positive correlation damping force and the negative correlation damping force to enable the acting forces at the two ends of the magnetorheological inertial container to be in direct proportion to the relative acceleration at the two ends of the magnetorheological inertial container all the time, thereby realizing the continuous adjustment of the inertial volume coefficient.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by utilizing the magneto-rheological effect and adjusting the current in the coil, the forces generated at the two ends of the inertial container are always in direct proportion to the relative acceleration at the two ends of the inertial container, so that the large-range and continuous adjustment of the inertial container coefficient is realized, the defect of narrow vibration reduction frequency band caused by the fact that the inertial container coefficient cannot be adjusted in the traditional inertial container is overcome, and the performance of the inertial container is further improved;
2. the invention adjusts the force generated at the two ends of the inertial container based on the magneto-rheological effect and has the characteristic of quick response;
3. the magnetorheological fluid of the magnetorheological inertial container works in a pure shearing mode, so that the use amount of the magnetorheological fluid is greatly reduced, and the manufacturing cost is reduced;
4. the invention has the advantages of relatively simple structure, small volume and less energy consumption, and is more beneficial to engineering application.
Drawings
FIG. 1 is a schematic diagram of the general structure of one embodiment of the present invention;
FIG. 2 is a three-dimensional schematic view of a magnetorheological inerter according to the present invention;
FIG. 3 is a schematic longitudinal sectional view of a magnetorheological inerter according to the present invention;
FIG. 4 is a schematic cross-sectional view of a magnetorheological inerter according to the present invention;
FIG. 5 is a three-dimensional schematic view of a magnetorheological damper in accordance with the present invention;
FIG. 6 is a schematic longitudinal cross-sectional view of a magnetorheological damper in accordance with the present invention.
FIG. 7 is a diagram of an embodiment of the present invention for the adjustment of the coefficient of inertia capacitance under excitation by relative sinusoidal displacement;
reference numbers in the figures: the magnetorheological fluid damper comprises a ball screw, a first bearing, a nut, a flywheel shell, a first coil, a first sealing ring, a second sealing ring, a flywheel, a magnetorheological fluid, a first bearing, a lower end cover, a first end cover, a second end cover, a piston shell, a piston, a second coil, an air bag, a first copper ring, a framework oil seal, a sealing ring, a second copper ring, a piston rod, a first rack, a second rack, a gear, a connecting piece and a second magnetorheological fluid, wherein the ball screw is 1, the first bearing is 2, the nut is 3, the flywheel.
Detailed Description
As shown in fig. 1, a magnetorheological inerter device is composed of a magnetorheological inerter and a force compensation mechanism;
as shown in fig. 2, 3 and 4, the magnetorheological inertial container is composed of a ball screw 1, a nut 3, a flywheel 9, a flywheel housing 4, a first coil 5, a first seal ring 6, a second seal ring 8, a first bearing 2, a second bearing 11, an upper end cover 7, a lower end cover 12 and a first magnetorheological fluid 10;
a flywheel 9 is fixed on the ball screw 1 through a nut 3, and the flywheel 9 and the nut 3 are coaxially fixed; the upper end surface and the lower end surface of the flywheel 9 are respectively provided with a first bearing 2 and a second bearing 11; the first bearing 2 and the second bearing 11 are coaxially assembled with the upper end cover 7 and the lower end cover 12 respectively and are used for forming a limiting structure for the axial movement of the flywheel 9; the flywheel 9 is ensured to rotate, and the axial movement of the flywheel 9 is limited;
a flywheel shell 4 is arranged on the outer side of the flywheel 9, and a first coil 5 is wound in a T-shaped groove on the inner side of the flywheel shell 4; a first sealing ring 6 is arranged in a gap between the outer side of the upper end of the flywheel shell 4 and the outer side of the upper end of the flywheel 9, a second sealing ring 8 is arranged between the flywheel shell 4 and the lower end cover 12, an annular closed cavity is formed between the flywheel shell 4 and the flywheel 9 and between the first sealing ring 6 and the second sealing ring 8, and first magnetorheological fluid 10 is filled in the annular closed cavity; the flywheel shell 4 is coaxially fixed with the upper end cover 7 and the lower end cover 12;
the force compensation mechanism consists of a magneto-rheological damper and a motion converter; as shown in fig. 5 and 6, the magnetorheological damper is composed of a piston rod 23, a piston 16, a second coil 17, a piston shell 15, an air bag 18, a first end cover 13, a second end cover 14, second magnetorheological fluid 28, a first copper ring 19, a second copper ring 22, a framework oil seal 20 and a seal ring 21;
the piston rod 23 is coaxially fixed with the piston 16; the second coil 17 passes through the inner through hole of the piston rod 23 and is wound in the annular groove of the piston 16;
a piston housing 15 is provided outside the piston rod 23; the piston 16 and the piston shell 15 are always kept coaxial; an air bag 18 is arranged at the bottom of the piston shell 15; for compensating for volume changes in the piston rod 23 as it moves in and out of the piston housing 15;
a first end cap 13 is arranged on the top of the piston housing 15; a second end cover 14 is arranged on the top of the piston rod 23, and a sealing ring 21 is arranged between the second end cover 14 and the piston shell 15; ensuring the tightness of the interior of the piston housing 15; a first copper ring 19 is arranged at the center of the first end cover 13, a second copper ring 22 is arranged at the center of the second end cover 14, the first copper ring 19 and the second copper ring 22 are coaxially assembled with a piston rod 23 respectively, and a framework oil seal 20 is arranged between the first copper ring 19 and the second copper ring 22; and is coaxially assembled with the piston rod 23 to avoid leakage of the magnetorheological fluid 28; a sealed cavity is formed between the piston shell 15 and the piston rod 23 and between the second end cover 14 and the air bag 18, and the sealed cavity is filled with the second magnetorheological fluid 28;
one end of the piston rod 23 is fixedly connected with one end of the ball screw 1 in the magnetorheological inertial container through a connecting piece 27;
as shown in fig. 1, the motion converter is composed of a first rack 24, a second rack 25 and a gear 26; one end of the first rack 24 is fixedly connected with the bottom of the piston shell 15 of the magnetorheological damper; one end of the second rack 25 is fixedly connected with one side of the lower end cover 12 of the magnetorheological inerter, and a gear 26 is arranged between the first rack 24 and the second rack 25.
In this embodiment, a method for continuously adjusting an inertial volume coefficient of a magnetorheological inertial volume device is performed according to the following steps:
and 5, adjusting the magnitudes of the positive correlation damping force and the negative correlation damping force to enable the acting forces at the two ends of the magnetorheological inertial container to be always in direct proportion to the relative accelerations at the two ends of the magnetorheological inertial container, thereby realizing the continuous adjustment of the inertial volume coefficient.
FIG. 7 shows an embodiment of the invention for realizing continuous adjustment of inerter coefficient under the condition that the relative displacement of two ends of an inerter is sinusoidal, and the working process is as follows: when sinusoidal displacement excitation is applied to the two ends of the magnetorheological inertial container, the flywheel 9 in the magnetorheological inertial container can generate force in direct proportion to the relative acceleration through the ball screw 1 due to the inertia of the flywheel, and the proportionality coefficient at the moment is the inertial volume coefficient at the moment. When the inertia capacity coefficient needs to be changed, the current in the first coil 5 of the magnetorheological inertia container needs to be changed, so that the viscosity of the first magnetorheological fluid 10 is changed, and the force generated at the two ends of the magnetorheological inertia container is further changed to form a certain proportion with the relative acceleration at the two ends of the inertia container. The force generated by the concentration change of the first magnetorheological fluid 10 can be regarded as a damping force related to the speed, and the acceleration and the speed under the excitation of the same displacement have a certain phase difference, which means that when the phases of the acceleration and the speed are opposite, the current for adjusting the first coil 5 of the magnetorheological inertial container cannot increase the force related to the relative acceleration, namely cannot increase the inertial volume coefficient; similarly, when the acceleration and the velocity are in the same phase, the force of the magnetorheological inerter related to the relative acceleration cannot be reduced, i.e. the inertance coefficient cannot be reduced. At this time, the inertia capacity coefficient can be continuously adjusted through the force compensation mechanism. Due to the action of the motion converter, the force generated by the magneto-rheological damper is always opposite to the force direction generated by the magneto-rheological inertia container due to the change of the viscosity of magneto-rheological fluid, so that the force which cannot be achieved by the magneto-rheological inertia container due to the phase difference is compensated, the forces generated at the two ends of the magneto-rheological inertia container can be increased or reduced in proportion all the time, and the continuous adjustment of the inertia capacity coefficient is realized. As shown in FIG. 7, under the excitation of relative sinusoidal displacement of 1Hz and 25mm, the magneto-rheological inerter system realizes the continuous adjustment of the inerter coefficient of 0-6000 kg.
Claims (2)
1. A magneto-rheological inerter device: the method is characterized in that: the magnetorheological inertia container consists of a magnetorheological inertia container and a force compensation mechanism;
the magnetorheological inerter comprises a ball screw (1), a nut (3), a flywheel (9), a flywheel shell (4), a first coil (5), a first sealing ring (6), a second sealing ring (8), a first bearing (2), a second bearing (11), an upper end cover (7), a lower end cover (12) and first magnetorheological fluid (10);
the ball screw (1) is fixed with the flywheel (9) through the nut (3), and the flywheel (9) and the nut (3) are coaxially fixed; the upper end surface and the lower end surface of the flywheel (9) are respectively provided with the first bearing (2) and the second bearing (11); the first bearing (2) and the second bearing (11) are respectively coaxially assembled with the upper end cover (7) and the lower end cover (12) and used for forming a limiting structure for the axial movement of the flywheel (9); the flywheel (9) is ensured to rotate, and the axial movement of the flywheel (9) is limited;
the flywheel housing (4) is arranged on the outer side of the flywheel (9), and the first coil (5) is wound in a T-shaped groove on the inner side of the flywheel housing (4); the first sealing ring (6) is arranged in an outer side gap between the flywheel shell (4) and the upper end of the flywheel (9), the second sealing ring (8) is arranged between the flywheel shell (4) and the lower end cover (12), an annular sealed cavity is formed between the flywheel shell (4) and the flywheel (9) and between the first sealing ring (6) and the second sealing ring (8), and first magnetorheological fluid (10) is filled in the annular sealed cavity; the flywheel shell (4) is coaxially fixed with the upper end cover (7) and the lower end cover (12);
the force compensation mechanism consists of a magneto-rheological damper and a motion converter; the magneto-rheological damper is composed of a piston rod (23), a piston (16), a second coil (17), a piston shell (15), an air bag (18), a first end cover (13), a second end cover (14), second magneto-rheological fluid (28), a first copper ring (19), a second copper ring (22), a framework oil seal (20) and a sealing ring (21);
the piston rod (23) and the piston (16) are coaxially fixed; the second coil (17) passes through an inner through hole of the piston rod (23) and is wound in an annular groove of the piston (16);
the piston shell (15) is arranged on the outer side of the piston rod (23); the piston (16) and the piston shell (15) are always kept coaxial; the air bag (18) is arranged at the bottom of the piston shell (15); the volume change generated in the process of moving the piston rod (23) into and out of the piston shell (15) is compensated;
the first end cover (13) is arranged at the top of the piston shell (15); the second end cover (14) is arranged at the top of the piston rod (23), and a sealing ring (21) is arranged between the second end cover (14) and the piston shell (15); the tightness of the interior of the piston shell (15) is ensured; the first copper ring (19) is arranged at the center of the first end cover (13), the second copper ring (22) is arranged at the center of the second end cover (14), the first copper ring (19) and the second copper ring (22) are coaxially assembled with a piston rod (23) respectively, and the framework oil seal (20) is arranged between the first copper ring (19) and the second copper ring (22); and is coaxially assembled with the piston rod (23) to avoid leakage of the magnetorheological fluid (28); a sealed cavity is formed between the piston shell (15) and the piston rod (23) and between the second end cover (14) and the air bag (18), and the sealed cavity is filled with second magnetorheological fluid (28);
one end of the piston rod (23) is fixedly connected with one end of a ball screw (1) in the magnetorheological inertial container through a connecting piece (27);
the motion converter consists of a first rack (24), a second rack (25) and a gear (26); one end of the first rack (24) is fixedly connected with the bottom of a piston shell (15) of the magnetorheological damper; one end of the second rack (25) is fixedly connected with one side of the lower end cover (12) of the magnetorheological inertial container, and the gear (26) is arranged between the first rack (24) and the second rack (25).
2. The method for continuously adjusting the inerter coefficient of the magnetorheological inerter device according to claim 1, which is characterized by comprising the following steps of:
step 1, applying displacement excitation on a ball screw (1) and a lower end cover (12) at two ends of the magnetorheological inertial container to enable the ball screw (1) to drive a flywheel (9) to rotate, and generating acting force in direct proportion to relative acceleration at two ends of the magnetorheological inertial container, so that a corresponding inertial volume coefficient is obtained according to the acting force;
step 2, changing the current of a first coil (5) in the magnetorheological inertial container to change the viscosity of the first magnetorheological fluid (10), so that positive correlation damping force with the excitation speed is generated at two ends of the magnetorheological inertial container;
step 3, adjusting the current of a second coil (17) in the magnetorheological inertial container to obtain the change of the viscosity of second magnetorheological fluid (28), so that two ends of the magnetorheological inertial container generate damping force related to the speed;
step 4, the lower end cover (12) drives the second rack (25) to move under the action of displacement excitation, and the first rack (24) and the second rack (25) move in opposite directions under the rotation of the gear (26), so that the piston rod (23) and the piston shell (15) move relatively, meanwhile, the magneto-rheological damper generates damping force inversely related to excitation speed and acts on two ends of the magneto-rheological inerter through the connecting piece (27) and the second rack (25);
and 5, adjusting the positive correlation damping force and the negative correlation damping force to enable the acting forces at the two ends of the magnetorheological inertial container to be in direct proportion to the relative acceleration at the two ends of the magnetorheological inertial container all the time, thereby realizing the continuous adjustment of the inertial volume coefficient.
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| CN201811602814.7A CN109630597B (en) | 2018-12-26 | 2018-12-26 | Magneto-rheological inerter device and continuous adjusting method of inerter coefficient thereof |
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| CN201811602814.7A CN109630597B (en) | 2018-12-26 | 2018-12-26 | Magneto-rheological inerter device and continuous adjusting method of inerter coefficient thereof |
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| CN109630597B true CN109630597B (en) | 2020-11-27 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112963488A (en) * | 2021-03-27 | 2021-06-15 | 同济大学 | Inertial capacity energy consumption and efficiency increasing device |
| CN113531028A (en) * | 2021-06-17 | 2021-10-22 | 武汉理工大学 | Damping variable magneto-rheological inertial volume vibration reduction system |
| CN113833149B (en) * | 2021-10-18 | 2023-02-03 | 湖南大学 | Tuned inerter damping support |
| CN116066521B (en) * | 2022-12-08 | 2024-07-26 | 湘潭大学 | Damping and inertia capacity compound control electromagnetic shock absorber |
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| WO2014104313A1 (en) * | 2012-12-27 | 2014-07-03 | 株式会社構造計画研究所 | Damping device and damping apparatus for structure |
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| CN105782342A (en) * | 2016-04-27 | 2016-07-20 | 江苏科技大学 | Ball screw type inerter with adjustable inerter value |
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Effective date of registration: 20220112 Address after: 230001 floor 6, block B, blue diamond Shangjie, No. 335, Suixi Road, Bozhou road street, Luyang District, Hefei City, Anhui Province Patentee after: Hefei Luyang Technology Innovation Group Co.,Ltd. Address before: 230601 No. 193, Tunxi Road, Baohe District, Hefei City, Anhui Province Patentee before: Hefei University of Technology |