CN109630597B - A magnetorheological inertial capacity device and a method for continuously adjusting its inertial capacity coefficient - Google Patents

Abstract

The invention discloses a magnetorheological inertial capacity device and a continuous adjustment method for its inertial capacity coefficient. The device is composed of a magnetorheological inertial container and a force compensation mechanism; the magnetorheological inertial container is composed of a ball screw, a nut and a flywheel. , the flywheel housing, the first coil, the first sealing ring, the second sealing ring, the first bearing, the second bearing, the upper end cover, the lower end cover and the first magnetorheological fluid; the force compensation mechanism is composed of a magnetorheological damper and The motion converter is composed of; the magnetorheological damper is composed of a piston rod, a piston, a second coil, a piston casing, an air bag, a first end cover, a second end cover, a second magnetorheological fluid, a first copper ring, a second copper ring It consists of a ring, a skeleton oil seal and a sealing ring; the motion converter consists of a first rack, a second rack and a gear. The invention adopts the force compensation mechanism, so that the force generated at both ends of the magnetorheological inertia container is always proportional to the relative acceleration of the two ends, thereby realizing the continuous adjustment of the inertial capacity coefficient.

Description

A magnetorheological inertial capacity device and its continuous adjustment method of inertia coefficient

technical field

The invention relates to an inertial capacity device, in particular to a magnetorheological inertial capacity device and a continuous adjustment method for the inertial capacity coefficient thereof.

technical background

Alleviating unnecessary vibration in production and life has always been the direction of researchers' continuous efforts. As a new type of vibration damping element, the inertial container was first proposed in 2003. The inertial container is a mass element with movable ends, and the force generated is proportional to the relative acceleration at both ends. The proportional coefficient is called the inertial capacity coefficient, and the unit is kilograms. The inertial container can simulate a larger "virtual mass" with its own small mass. Compared with traditional mass components, its smaller structural size and mass make it more beneficial to engineering applications. In 2005, the inertial container was first applied to the F1 car, which improved the handling and tire grip performance of the car. In 2006, a steering compensation device containing an inertial container was applied to a high-performance motorcycle, improving the steering performance of the motorcycle. Since then, the application research of inertial container also involves the fields of train suspension, automobile suspension, construction and bridge. Since the inertia coefficient cannot be adjusted, the vibration reduction frequency band of the passive inertial vessel is narrow, which hinders the further improvement of the inertial vessel performance to a certain extent. In order to realize the adjustment of the inertial capacity coefficient, the researchers proposed a mechanically adjustable inertial container, which can adjust the inertial capacity coefficient by adjusting the position of the mass block to change the rotational inertia of the flywheel. In addition, a hydraulically adjustable inertial container is proposed, and the inertial coefficient is adjusted in stages by controlling hydraulic valves. Although both realize the adjustment of the inertial capacity coefficient, the adjustment speed of the former is slow, while the latter cannot achieve continuous adjustment, resulting in limited performance of the inertial container.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the present invention proposes a magnetorheological inertial capacity device and a continuous adjustment method for the inertial capacity coefficient, in order to realize the rapid adjustment of the inertial capacity coefficient in a wide range, thereby improving the inertial capacity. performance.

The present invention adopts the following technical scheme for solving the technical problem:

The magnetorheological inertial capacity device of the present invention is characterized in that: it is composed of a magnetorheological inertial container and a force compensation mechanism;

The magnetorheological inertial container is composed of a ball screw, a nut, a flywheel, a flywheel housing, 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 a first magnet. composition of rheological fluid;

The flywheel is fixed on the ball screw through the nut, and the flywheel and the nut are coaxially fixed; the upper end surface and the lower end surface of the flywheel are respectively provided with the first bearing and the second bearing ; and the first bearing and the second bearing are respectively assembled with the upper end cover and the lower end cover coaxially, to form a limiting structure for the axial movement of the flywheel; while ensuring the rotation of the flywheel, the shaft of the flywheel is limited to move;

The flywheel housing is arranged outside the flywheel, the first coil is wound in the inner T-shaped groove of the flywheel housing; the flywheel housing is arranged in the outer gap between the flywheel housing and the upper end of the flywheel a first sealing ring, the second sealing ring is arranged between the flywheel housing and the lower end cover, and the first sealing ring and the second sealing ring are arranged between the flywheel housing and the flywheel An annular closed cavity is formed therebetween, and the annular closed cavity is filled with the first magnetorheological fluid; the flywheel housing is coaxially fixed with the upper end cover and the lower end cover;

The force compensation mechanism is composed of a magnetorheological damper and a motion converter; the magnetorheological damper is composed of a piston rod, a piston, a second coil, a piston casing, an air bag, a first end cover, and a second end cover. , the second magnetorheological fluid, the first copper ring, the second copper ring, the skeleton oil seal and the sealing ring;

The piston rod is fixed coaxially with the piston; 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 housing is arranged on the outside of the piston rod; the piston and the piston housing are always kept coaxial; the airbag is arranged at the bottom of the piston housing; it is used to compensate the volume generated during the process of the piston rod entering and leaving the piston housing Variety;

The first end cap is provided on the top of the piston housing; the second end cap is provided on the top of the piston rod, and a seal is provided between the second end cap and the piston housing ensure the sealing performance inside the piston casing; 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, and the The first copper ring and the second copper ring are respectively assembled coaxially with the piston rod, and the skeleton oil seal is arranged between the first copper ring and the second copper ring; leaking; a sealing cavity is formed between the piston housing and the piston rod, and between the second end cover and the airbag, and the sealing cavity is filled with a second magnetorheological fluid;

One end of the piston rod is fixedly connected with one end of the ball screw in the magnetorheological inertial container through a connecting piece;

The motion converter is composed of a first rack, a second rack and a gear; one end of the first rack is fixedly connected with the bottom of the piston housing of the magnetorheological damper; one end of the second rack It 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 characteristic of the continuous adjustment method of the inertial capacity coefficient of the magnetorheological inertial capacity device of the present invention is to carry out the following steps:

Step 1. Apply displacement excitation on the ball screws at both ends of the magnetorheological inertial container and the lower end cover, so that the ball screw drives the flywheel to rotate, and generates relative acceleration at both ends of the magnetorheological inertial container. proportional to the acting force, so as to obtain the corresponding inertia coefficient according to the acting force;

Step 2. Change the current of the first coil in the magnetorheological inertial container, so that the viscosity of the first magnetorheological fluid changes, so that the two ends of the magnetorheological inertial container generate a positive correlation damping with the excitation speed force;

Step 3, adjusting the current of the second coil in the magnetorheological inertial container, so that the viscosity of the second magnetorheological fluid changes, so that both ends of the magnetorheological inertial container generate a damping force related to speed;

Step 4. Under the action of displacement excitation, the lower end cover drives the second rack to move and makes the first rack and the second rack move in the opposite direction under the rotation of the gear, so that the piston rod and the piston casing are connected. The magnetorheological dampers move relatively between them, and at the same time, the magnetorheological damper generates a damping force that is inversely related to the excitation speed, and acts on both ends of the magnetorheological inertial container through the connecting piece and the second rack;

Step 5. By adjusting the magnitudes of the positive correlation damping force and the inverse correlation damping force, the force at both ends of the magnetorheological inertial container is always proportional to the relative acceleration at both ends thereof, thereby realizing the continuous adjustment of the inertial capacity coefficient.

Compared with the prior art, the beneficial effects of the present invention are embodied in:

1. The present invention utilizes the magnetorheological effect to adjust the current in the coil, so that the force generated at both ends of the inertial container is always proportional to the relative acceleration at both ends, thereby realizing a large-scale and continuous adjustment of the inertial capacity coefficient, overcoming the traditional The inertial container has the defect of a narrow vibration reduction frequency band due to the inability to adjust the inertial capacity coefficient, which further improves the performance of the inertial container;

2. The present invention adjusts the force generated at both ends of the inertial container based on the magnetorheological effect, and has the characteristics of rapid response;

3. The magnetorheological fluid of the magnetorheological inertial container in the present invention works in the pure shear mode, which greatly reduces the usage of the magnetorheological fluid and reduces the manufacturing cost;

4. The structure of the present invention is relatively simple, the volume is small, and the energy consumption is low, which is more favorable for engineering application.

Description of drawings

1 is a schematic diagram of the overall structure of an embodiment of the present invention;

Figure 2 is a three-dimensional schematic diagram of a magnetorheological inertial vessel in the present invention;

Fig. 3 is the longitudinal sectional schematic diagram of the magnetorheological inertia container in the present invention;

4 is a schematic cross-sectional view of a magnetorheological inertial vessel in the present invention;

5 is a three-dimensional schematic diagram of a magnetorheological damper in the present invention;

FIG. 6 is a schematic longitudinal cross-sectional view of the magnetorheological damper in the present invention.

FIG. 7 is a diagram of an embodiment of the adjustment of the inertial capacity coefficient under the excitation of relative sinusoidal displacement according to the present invention;

Labels in the figure: 1 ball screw, 2 first bearing, 3 nut, 4 flywheel housing, 5 first coil, 6 first sealing ring, 7 upper end cover, 8 second sealing ring, 9 flywheel, 10 first magnetic current Fluid change, 11 second bearing, 12 lower end cover, 13 first end cover, 14 second end cover, 15 piston housing, 16 piston, 17 second coil, 18 air bag, 19 first copper ring, 20 skeleton oil seal, 21 Sealing ring, 22 second copper ring, 23 piston rod, 24 first rack, 25 second rack, 26 gear, 27 connecting piece, 28 second magnetorheological fluid.

Detailed ways

As shown in Figure 1, a magnetorheological inertial device is composed of a magnetorheological inertial container and a force compensation mechanism;

As shown in Figure 2, Figure 3 and Figure 4, the magnetorheological inertial container consists of a ball screw 1, a nut 3, a flywheel 9, a flywheel housing 4, a first coil 5, a first sealing ring 6, a second sealing ring 8, The first bearing 2, the second bearing 11, the upper end cover 7, the lower end cover 12 and the first magnetorheological fluid 10 are composed;

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; and 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 to form a limiting structure for the axial movement of the flywheel 9; while ensuring the rotation of the flywheel 9, the axial movement of the flywheel 9 is restricted;

A flywheel housing 4 is arranged on the outside of the flywheel 9, and a first coil 5 is wound in the inner T-shaped groove of the flywheel housing 4; a first sealing ring 6 is arranged in the outer gap between the flywheel housing 4 and the upper end of the flywheel 9. A second sealing ring 8 is arranged between the outer casing 4 and the lower end cover 12, so that an annular closed cavity is formed between the flywheel casing 4 and the flywheel 9, and between the first sealing ring 6 and the second sealing ring 8. In the annular closed cavity Filled with the first magnetorheological fluid 10; the flywheel housing 4 is coaxially fixed with the upper end cover 7 and the lower end cover 12;

The force compensation mechanism is composed of a magnetorheological damper and a motion converter; as shown in Figures 5 and 6, the magnetorheological damper is composed of a piston rod 23, a piston 16, a second coil 17, a piston casing 15, and an air bag 18. , the first end cover 13, the second end cover 14, the second magnetorheological fluid 28, the first copper ring 19, the second copper ring 22, the skeleton oil seal 20 and the sealing 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 on the outside of the piston rod 23; the piston 16 and the piston housing 15 are always kept coaxial; an airbag 18 is provided at the bottom of the piston housing 15; Variety;

A first end cover 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 housing 15; 15 Internal tightness; a first copper ring 19 is provided in the center of the first end cover 13, a second copper ring 22 is provided in the center of the second end cover 14, and the first copper ring 19 and the second copper ring 22 are respectively assembled coaxially with the piston rod 23, and a skeleton 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 sealing cavity is formed between the casing 15 and the piston rod 23, and between the second end cover 14 and the air bag 18, and the sealing 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 the connecting piece 27;

As shown in Figure 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 to the bottom of the piston housing 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 a gear 26 is provided between the first rack 24 and the second rack 25 .

In this embodiment, a method for continuously adjusting the inertia coefficient of a magnetorheological inertial device is performed as follows:

Step 1. Apply displacement excitation on the ball screw 1 and the lower end cover 12 at both ends of the magneto-rheological inertial container, so that the ball screw 1 drives the flywheel 9 to rotate, and the two ends of the magneto-rheological inertial container are generated proportional to the relative acceleration. , so that the corresponding inertia coefficient can be obtained according to the acting force;

Step 2, changing the current of the first coil 5 in the magnetorheological inertial container, so that the viscosity of the first magnetorheological fluid 10 changes, so that the two ends of the magnetorheological inertial container generate a positive correlation damping force with the excitation speed;

Step 3, adjusting the current of the second coil 17 in the magnetorheological inertial container, so that the viscosity of the second magnetorheological fluid 28 changes, so that the two ends of the magnetorheological inertial container generate a damping force related to the speed;

Step 4. Under the action of displacement excitation, the lower end cover 12 drives the second rack 25 to move and makes the first rack 24 and the second rack 25 move in the opposite direction under the rotation of the gear 26, so that the piston rod 23 and the piston are moved in opposite directions. The shells 15 move relative to each other, and at the same time, the magnetorheological damper generates a damping force that is inversely related to the excitation speed, and acts on both ends of the magnetorheological inertia container through the connecting piece 27 and the second rack 25;

Step 5. By adjusting the magnitudes of the positive correlation damping force and the inverse correlation damping force, the acting force at both ends of the magnetorheological inertial vessel is always proportional to the relative acceleration at both ends thereof, so as to realize the continuous adjustment of the inertial capacity coefficient.

Fig. 7 shows an embodiment of the present invention for realizing the continuous adjustment of the inertial capacity coefficient when the relative displacement of the two ends of the inertial container is sinusoidal. , due to its own inertia, the flywheel 9 in the magnetorheological inertial container will generate a force proportional to the relative acceleration at both ends of the inertial container through the ball screw 1, and the proportional coefficient at this time is the inertial capacity coefficient at this time. When the coefficient of inertia needs to be changed, the current in the first coil 5 of the magnetorheological inertial container must be changed, so that the viscosity of the first magnetorheological fluid 10 changes, and the force generated at both ends of the magnetorheological inertial container is changed. , which is proportional to the relative acceleration at both ends of the inertial 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 same displacement excitation have a certain phase difference, which means that when the phase of the acceleration and the speed is On the contrary, adjusting the current of the first coil 5 of the magnetorheological inertial container will not be able to increase the force related to the relative acceleration, that is, the inertial coefficient cannot be increased; similarly, when the phase of the acceleration and the velocity are the same, the magnetic force cannot be increased. The force associated with the relative acceleration of the rheological inertial vessel is reduced, that is, the coefficient of inertia cannot be reduced. At this time, the continuous adjustment of the inertia coefficient can be realized by the force compensation mechanism. Due to the action of the motion converter, the force generated by the magnetorheological damper is always in the opposite direction to the force generated by the magnetorheological inertial vessel due to the viscosity change of the magnetorheological fluid, which compensates the original magnetorheological inertial vessel due to the phase difference. For the unreachable part of the force, the force generated at both ends of the magnetorheological inertial vessel can always be increased or decreased proportionally, that is, the continuous adjustment of the inertial capacity coefficient is realized. As shown in Figure 7, under the excitation of relative sinusoidal displacement of 1Hz and 25mm, the magnetorheological inertial capacity system realizes the continuous adjustment of the inertial capacity coefficient of 0-6000kg.

Claims (2)

1. A magnetorheological inertial capacity device: it is characterized in that: it is composed of a magnetorheological inertial container and a force compensation mechanism; 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 sealing ring (6), and a second sealing 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); The flywheel (9) is fixed on the ball screw (1) through the nut (3), and the flywheel (9) and the nut (3) are coaxially fixed; the flywheel (9) The first bearing (2) and the second bearing (11) are respectively provided on the upper end surface and the lower end surface of the bearing; and the first bearing (2) and the second bearing (11) are respectively connected with the upper end cover (7) It is coaxially assembled with the lower end cover (12), and is used to form a limiting structure for the axial movement of the flywheel (9); while ensuring the rotation of the flywheel (9), the axial movement of the flywheel (9) is restricted; The flywheel housing (4) is arranged on the outer side of the flywheel (9), the first coil (5) is wound in the inner T-slot of the flywheel housing (4); 4) The first sealing ring (6) is arranged in the outer gap with the upper end of the flywheel (9), and the second sealing ring (6) is arranged between the flywheel housing (4) and the lower end cover (12). A sealing ring (8), an annular closed cavity is formed between the flywheel housing (4) and the flywheel (9), and between the first sealing ring (6) and the second sealing ring (8), The annular closed cavity is filled with a first magnetorheological fluid (10); the flywheel housing (4) is coaxially fixed with the upper end cover (7) and the lower end cover (12); The force compensation mechanism is composed of a magnetorheological damper and a motion converter; the magnetorheological damper is composed of a piston rod (23), a piston (16), a second coil (17), and a piston casing (15) , airbag (18), first end cover (13), second end cover (14), second magnetorheological fluid (28), first copper ring (19), second copper ring (22), skeleton oil seal (20) is composed of a sealing 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); The piston housing (15) is arranged on the outside of the piston rod (23); the piston (16) and the piston housing (15) are always kept coaxial; the bottom of the piston housing (15) is provided with the piston housing (15). Airbag (18); used for compensating for the volume change of piston rod (23) in and out of piston housing (15); The first end cover (13) is provided on the top of the piston housing (15); the second end cover (14) is provided on the top of the piston rod (23), and the second end cover (14) is provided on the top of the piston rod (23). A sealing ring (21) is arranged between the end cover (14) and the piston casing (15); the sealing performance inside the piston casing (15) is ensured; The first copper ring (19) is provided with the second copper ring (22) in the center of the second end cover (14), and the first copper ring (19) and the second copper ring (22) ) are respectively assembled coaxially with the piston rod (23), and the skeleton oil seal (20) is arranged between the first copper ring (19) and the second copper ring (22); and is assembled coaxially with the piston rod (23) , to avoid the leakage of magnetorheological fluid (28); between the piston housing (15) and the piston rod (23), and between the second end cover (14) and the air bag (18) forming a sealed cavity, and the sealed cavity is filled with a 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); 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 connected to a piston housing ( 15); 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 first rack (24) and the second rack ( The gears (26) are arranged between 25). 2. the continuous adjustment method of the inertial capacity coefficient of the magnetorheological inertial capacity device according to claim 1, is characterized in that carrying out as follows: Step 1. Apply displacement excitation on the ball screw (1) and the lower end cover (12) at both ends of the magnetorheological inertial container, so that the ball screw (1) drives the flywheel (9) to rotate, and the ball screw (1) drives the flywheel (9) to rotate. The two ends of the magnetorheological inertial container generate an acting force proportional to the relative acceleration, so that the corresponding inertial capacity coefficient can be obtained according to the acting force; Step 2. Change the current of the first coil (5) in the magnetorheological inertial container, so that the viscosity of the first magnetorheological fluid (10) changes, so that the two ends of the magnetorheological inertial container produce Positively related damping force of excitation velocity; Step 3. Adjust the current of the second coil (17) in the magnetorheological inertial container, so that the viscosity of the second magnetorheological fluid (28) changes, so that the two ends of the magnetorheological inertial container produce velocity-dependent damping force; Step 4. Under the action of displacement excitation, the lower end cover (12) drives the second rack (25) to move and makes the first rack (24) and the second rack (25) rotate under the rotation of the gear (26). ) moves in the opposite direction, so that the relative movement between the piston rod (23) and the piston housing (15), while the magnetorheological damper generates an inversely related damping force with the excitation speed, and passes through the connecting piece (27) and the first Two racks (25) act on both ends of the magnetorheological inertial container; Step 5. By adjusting the magnitudes of the positive correlation damping force and the inverse correlation damping force, the force at both ends of the magnetorheological inertial container is always proportional to the relative acceleration at both ends thereof, thereby realizing the continuous adjustment of the inertial capacity coefficient.

Images