CN114940109B - Multidimensional vibration reduction seat - Google Patents
Multidimensional vibration reduction seat Download PDFInfo
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- CN114940109B CN114940109B CN202210716936.9A CN202210716936A CN114940109B CN 114940109 B CN114940109 B CN 114940109B CN 202210716936 A CN202210716936 A CN 202210716936A CN 114940109 B CN114940109 B CN 114940109B
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- damper
- shock absorber
- piston
- guide rod
- vibration
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- 230000009467 reduction Effects 0.000 title claims description 13
- 230000035939 shock Effects 0.000 claims abstract description 99
- 239000006096 absorbing agent Substances 0.000 claims abstract description 96
- 238000013016 damping Methods 0.000 claims abstract description 69
- 229920001971 elastomer Polymers 0.000 claims abstract description 32
- 239000000806 elastomer Substances 0.000 claims abstract description 32
- 238000004804 winding Methods 0.000 claims abstract description 24
- 238000007667 floating Methods 0.000 claims abstract description 20
- 238000001125 extrusion Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims description 39
- 230000008859 change Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 abstract description 22
- 239000000463 material Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 8
- 230000005284 excitation Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002520 smart material Substances 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 201000003152 motion sickness Diseases 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000451 tissue damage Effects 0.000 description 1
- 231100000827 tissue damage Toxicity 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/506—Seat guided by rods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
- B60N2/38—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles specially constructed for use on tractors or like off-road vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/52—Seat suspension devices using fluid means
- B60N2/527—Seat suspension devices using fluid means using liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/06—Magnetic or electromagnetic
Abstract
The invention provides a multidimensional vibration damping seat, comprising: an upper platform and a lower platform; a front guide rod of the shock absorber and a rear guide rod of the shock absorber; the shock absorber front guide rod includes: the vibration damper comprises a vibration damper sleeve, an extrusion type magnetorheological elastomer, an upper coil winding, two permanent magnets and a force transmission spring. The shock absorber rear guide rod includes: a damper cylinder; a damper piston, a flow control disc, a stepping motor, a lower coil winding and a floating piston. The damper piston rod is arranged in the damper sleeve, penetrates through the two permanent magnets, the extrusion type magnetorheological elastomer, the force transmission spring and the damper cylinder cover, and the lower end of the damper piston rod is inserted into the damper cylinder barrel and connected with the damper piston. The invention combines the variable-rigidity variable-damping shock absorber with the Stewart parallel mechanism to obtain the semi-actively-controlled multidimensional shock absorbing mechanism, which can simultaneously attenuate the vibration with multiple degrees of freedom.
Description
Technical Field
The invention relates to the technical field of engineering machinery multidimensional vibration damping seats and intelligent materials, in particular to a multidimensional vibration damping seat.
Background
Engineering machinery vehicles often work in severe working condition environments, and because vibration excitation of ground input is large, the vehicle suspension performance is poor, and the riding comfort of the vehicle is seriously affected. High frequency vibration excitation from the ground can be rapidly attenuated by the tires and suspension system, while low frequency vibration excitation having a large influence on the human body is transmitted to the driver or the passenger through the vehicle floor, the seat. The vehicle driver is in a low-frequency vibration environment for a long time, so that driving fatigue and dullness in response can be caused, traffic accidents are caused, the physical health of the driver is seriously influenced and damaged by severe low-frequency vibration, particularly, the lumbar vertebra, the spine and the viscera of the driver can be greatly damaged, and the phenomena of passenger body tissue damage, carsickness and the like can be caused. The seat is an important vibration isolation device for non-road vehicles, and has the main functions of supporting the body of a driver, relieving the impact of uneven road surface to the human body and attenuating the vibration caused by the impact, thereby providing a comfortable and safe riding environment for the driver and facilitating the driving and maneuvering of the driver.
Chinese patent CN 101695908B discloses a parallel multi-freedom automobile vibration-damping seat, which has vibration-damping function in three directions of x-axis rotation, y-axis rotation and z-axis movement, the parallel mechanism is composed of four single branched chains and a main chain in parallel, the single branched chains are composed of ball pairs, moving pairs and ball pairs in turn, and the main chain is composed of moving pairs and hook hinges in the middle. Chinese patent CN 106627287A discloses a magnetorheological six-degree-of-freedom parallel vibration-damping seat platform, the six-degree-of-freedom parallel vibration-damping structure is a three-branched-chain space parallel structure, each branched chain is composed of a ball pair, a revolute pair and a movable pair in turn, a single-cylinder double-rod magnetorheological damper is used for replacing the movable pair on each branched chain, and a single-cylinder single-rod magnetorheological damper is arranged at the revolute pair, so that the self-adaptive characteristic of the seat is enhanced.
The conventional passive seat has fixed vibration parameters such as rigidity and damping coefficient, so that drivers or passengers with different weights can have different natural frequencies and cannot adapt to various impact pavements. The passive vehicle vibration damping seat is difficult to meet the increasing comfort requirement, and the vibration damping seat is designed to have multi-dimensional vibration damping capability in consideration of the fact that the seat is excited to vibrate in multiple dimensions in actual work. The optimal solution is to design a semi-active control multi-dimensional seat suspension system with good vibration damping performance, so that the multi-dimensional vibration damping of the seat by using a plurality of vibration dampers to form a parallel mechanism is a very feasible method.
The Stewart mechanism is used as a classical parallel mechanism, has the characteristics of high rigidity, high bearing capacity and small operation space requirement, has high control precision, and can be used for various active control mechanisms. In the fifth sixty of the 20 th century, the original Stewart mechanism was used for tire quality detection mechanism and pilot flight training simulator mechanism, and then was widely used for parallel operation robots, precise instrument vibration isolation control in satellites, whole-satellite vibration isolation, space telescope attitude gyro reaction force vibration isolation and the like. The research institutions at home and abroad have conducted intensive research on Stewart institutions, wherein the university of Harbin industry, california and China walks in the field of aerospace. The Stewart mechanism has simple structure, can meet the multi-dimensional vibration reduction requirement of six degrees of freedom, has high reliability and has wide application prospect in the field of engineering vibration reduction and noise reduction.
Six dampers forming the Stewart mechanism are divided into a passive damper, a semi-active damper and an active damper from the damping mode. The passive shock absorber consists of a spring and a damper, once the rigidity and the damping coefficient of performance parameters of the passive shock absorber cannot be changed, the shock absorbing performance has the best effect under a certain bearing quality and a certain excitation frequency, and the passive shock absorber has the advantages of simple structure, low manufacturing cost and high reliability; the active vibration damper is characterized in that a controllable force generator is additionally arranged on the basis of a passive vibration damper, vibration damping control is realized by controlling the acting force of the force generator, the active vibration damper has good active vibration damping effect, but an energy device for providing control force outside is required, the manufacturing cost is high, the energy consumption is high, the vibration damper is used for vibration damping control, and once the force generator fails, the vibration damping effect can be drastically reduced; the semi-active control vibration damper has the characteristics that the rigidity or the damping coefficient is adjustable, the vibration damping performance is superior to that of a passive vibration damper, the energy consumption is lower than that of the active control vibration damper, and the comprehensive performance is higher.
In recent years, the development of magnetorheological intelligent materials is rapid, and the current application of the magnetorheological fluid materials and the magnetorheological elastomer materials is relatively wide. The damping coefficient of the magnetorheological fluid material can be changed rapidly under the action of a magnetic field environment, and the magnetorheological elastomer material can be subjected to expansion and contraction change and change the rigidity under the action of the magnetic field environment. At present, a plurality of novel controllable vibration dampers have been developed by using intelligent materials. By combining the characteristics, the invention adopts the Stewart mechanism to realize the multi-dimensional vibration reduction of the vehicle seat, replaces the vibration reduction mechanism of each branched chain of the Stewart mechanism with the semi-active control vibration absorber based on the magnetorheological intelligent material, realizes the control of the vibration parameters of the system by controlling the rigidity and the damping parameters of each vibration absorber, and finally realizes the optimal multi-dimensional vibration reduction effect under different weight drivers and various road conditions.
Therefore, there is a need in the art for a novel multi-dimensional semi-active vibration damping seat that can damp vibrations in multiple directions, is simple and reliable in structure, is low in manufacturing cost, and has controllable stiffness and damping parameters.
Disclosure of Invention
The invention provides the following technical scheme for solving the problems.
A multi-dimensional vibration reduction seat comprising:
an upper platform and a lower platform;
the front guide rod of the shock absorber is sleeved at the front end of the rear guide rod of the shock absorber, the rear guide rod of the shock absorber is hinged with the upper platform, and the front guide rod of the shock absorber is hinged with the lower platform;
wherein, the shock absorber front guide arm includes:
a damper sleeve;
the extrusion type magnetorheological elastomer is arranged in the shock absorber sleeve;
the upper coil winding is arranged on the inner wall of the damper sleeve and is wound around the extrusion type magnetorheological elastomer;
the two permanent magnets are respectively arranged above and below the extrusion type magnetorheological elastomer; and
the upper end of the force transmission spring is connected with the permanent magnet arranged below the extrusion type magnetorheological elastomer, and the lower end of the force transmission spring is connected with the rear guide rod of the shock absorber;
the shock absorber rear guide rod includes:
the shock absorber sleeve is sleeved at the upper end of the shock absorber cylinder barrel, and a shock absorber cylinder cover is arranged on the top cover of the shock absorber cylinder barrel;
the shock absorber piston is arranged in the shock absorber cylinder barrel, and a flow control rod is arranged in the shock absorber piston;
the flow control disc is arranged at the bottom of the shock absorber piston and is fixedly connected with the bottom end of the flow control rod; the flow control disc is provided with a control disc magneto-rheological fluid flow hole;
the stepping motor is arranged in the space above the shock absorber piston;
the lower coil winding is wound at the middle part of the damper piston; and
the floating piston is arranged in the shock absorber cylinder barrel and is positioned below the shock absorber piston, the floating piston divides the inner part of the shock absorber cylinder barrel into an upper part and a lower part, wherein the upper part is a variable damping working cavity filled with magnetorheological fluid, the lower part is an air chamber, and compressed air is contained in the air chamber; and
the damper piston rod is arranged in the damper sleeve, penetrates through the two permanent magnets, the extrusion type magnetorheological elastomer, the force transmission spring and the damper cylinder cover, and the lower end of the damper piston rod is inserted into the damper cylinder barrel and connected with the damper piston;
the piston magnetorheological fluid flow through hole is communicated with the channel structure and the control disc magnetorheological fluid flow through hole; and is also provided with
The stepping motor drives the flow control rod and the flow control disc to rotate, the superposition area of the magnetorheological fluid flow through hole of the control disc and the magnetorheological fluid flow through hole of the piston is changed, and then the damping of the shock absorber is changed, and the damping of the shock absorber is adjusted in a multistage mode by combining with the change of the energizing current of the lower coil winding.
A damper upper cover is sleeved above the damper sleeve, the damper rear guide rod is hinged with the upper platform through the damper upper cover,
the lower part of the shock absorber cylinder barrel is sleeved with a shock absorber lower cover, and the shock absorber front guide rod is hinged with the lower platform through the shock absorber lower cover.
The upper end and the lower end of the force transfer spring are respectively connected with the permanent magnet and the cylinder cover of the shock absorber which are arranged below the extrusion type magnetorheological elastomer through a spring chuck.
And a floating piston sealing ring is arranged on the floating piston, so that magnetorheological fluid in a cavity above the floating piston is isolated from the air chamber below the floating piston.
Two shock absorber piston sealing rings are respectively arranged at the upper part and the lower part of the shock absorber piston so as to be matched with the inner wall of the shock absorber cylinder barrel.
A piston rod sealing ring is arranged in the middle of the shock absorber cylinder cover so as to ensure the sealing between the shock absorber piston rod and the shock absorber cylinder cover.
The lower side of upper platform is provided with the articulated platform, be provided with the articulated ball on the articulated bench, the upside of lower platform is provided with the articulated bench down, be provided with the articulated ball down on the articulated bench down, the shock absorber upper cover through last mounting hole with it is connected to go up the articulated ball, the shock absorber front guide arm through down the mounting hole with articulated ball down is connected.
Compared with the prior art, the invention has the beneficial effects that:
1. the variable-rigidity variable-damping shock absorber is combined with the Stewart parallel mechanism to obtain the semi-actively-controlled multidimensional shock absorbing mechanism, and vibration with multiple degrees of freedom can be damped simultaneously.
2. The novel magnetorheological material is adopted, and the magnetic field environments of the extrusion type magnetorheological elastomer material and the magnetorheological fluid material are respectively controlled by two paths of currents, so that the purposes of variable rigidity and variable damping are achieved.
3. Simple structure, high reliability, convenient manufacture and installation, and is suitable for seat vibration reduction application in the field of engineering machinery.
Drawings
Fig. 1 is a schematic structural diagram of a smart material damper.
Fig. 2 is an enlarged view of the working piston of the smart material damper.
FIG. 3 is a top view of a smart material damper flow control disk.
Fig. 4 is a front view of a multi-dimensional vibration-damped seat platform.
Fig. 5 is a top view of a multi-dimensional vibration-damped seat platform.
In the figure, 1 is a mounting hole on the shock absorber; 2-a damper upper cover; 3-a damper piston rod; 4-a damper sleeve; 5-upper coil winding; 6-permanent magnet; 7-a magnetorheological elastomer; 8-a spring chuck; 9-a force transmission spring; 10-a damper cylinder; 11-a damper cylinder head; 12-a piston rod sealing ring; 13-a damper piston; 14-a flow control disc; 15-magnetorheological fluid; 16-lower coil windings; 17-a damper piston seal; 18-floating piston; 19-floating piston seal ring; 20-air chamber; a lower cover of the damper 21; 22-mounting holes on the damper; 23-a stepper motor; 24-a flow control lever; 25-a flow control disc; 26-a control disk magnetorheological fluid flow orifice; 27-an upper platform; 28-upper hinging stage, 29-upper hinging ball; 30-a rear guide rod of the shock absorber; 31-lower platform; 32-a lower hinge table; 33-lower hinge ball; 34-damper front guide bar.
Detailed Description
The present invention will be described in further detail by way of specific examples, which will be more fully understood by those skilled in the art, but which are not intended to limit the invention in any way.
The rigidity change is controlled by controlling the current of the exciting coil and changing the magnetic field intensity of the position where the extrusion type magnetorheological elastomer is positioned. The flow control panel is adjusted through the stepping motor, and the viscosity of the magnetorheological fluid in the cylinder is adjusted through the control of the current of the exciting coil, so that the damping multistage adjustment is realized. The two methods are combined to finally realize the aim of simultaneously adjusting the rigidity and the damping of the shock absorber.
As shown in fig. 1-5, the present invention achieves semi-active control multi-dimensional vibration damping by a six degree-of-freedom vibration damping seat constructed from six damper branches equipped with smart materials. The six-degree-of-freedom vibration damping platform consists of an upper platform 27, a lower platform 31 and an intelligent material semi-active vibration damper. The intelligent material semi-active damper comprises a damper front guide rod 34 and a damper rear guide rod 30, wherein the damper front guide rod 34 is sleeved at the front end of the damper rear guide rod 30, the damper rear guide rod 30 is hinged with the upper platform 27 through an upper hinge ball 29, and the damper front guide rod 34 is hinged with the lower platform 31 through a lower hinge ball 33.
In operation, the lower platform 31 of the semi-actively controlled multidimensional vibration damping platform is rigidly connected with the cab floor by bolts, and the upper platform 27 is rigidly connected with the vehicle seat by bolts. Six intelligent material dampers are hinged to the upper platform 27 and the lower platform 31 respectively by ball hinges. Specifically, an upper hinge table 28 is provided at the lower side of the upper platform 27, an upper hinge ball 29 is provided on the upper hinge table 28, a lower hinge table 32 is provided at the upper side of the lower platform 31, a lower hinge ball 33 is provided on the lower hinge table 32, a damper rear guide bar 30 is connected with the upper hinge ball 29, and a damper front guide bar 34 is connected with the lower hinge ball 33. The vibration sensors respectively arranged on the upper platform 27 and the lower platform 31 are used for collecting vibration acceleration signals of the upper platform and the lower platform, and simultaneously are also used for controlling the rigidity and the damping of the intelligent material shock absorber. The acceleration sensor signals are respectively received by the data acquisition instrument and the upper computer, the upper computer processes the control target signals, and the control board card sends out current control signals.
Damping control of the shock absorber is mainly completed in the shock absorber piston 13, a lower coil winding coil 16 is wound in the middle of the shock absorber piston 13, and the viscosity of magnetorheological fluid passing through a piston channel is changed by controlling the magnitude of current supplied to the lower coil winding 16 and generating magnetic fields with different magnetic induction intensities, so that the damping of the shock absorber is changed.
The stepping motor 23 in the space above the piston drives the flow control rod 24 and the flow control disc 25 below to rotate, and the superposition area of the magnetorheological fluid flow through hole 26 of the flow control disc and the magnetorheological fluid flow through hole of the piston below the piston is changed, so that the passing area of the magnetorheological fluid when flowing through the piston of the shock absorber is changed, the damping of the shock absorber is further changed, and the multistage adjustment of the damping of the shock absorber is realized by combining the change of the energizing current of the lower coil winding.
The rigidity control of the damper is mainly completed by two permanent magnets 6 extruding magneto-rheological elastomer 7 and an upper coil winding 5 wound on the inner wall of the damper sleeve 4. The damper is operated by varying the magnetic field environment around the magnetorheological elastomer 7 by adjusting the current of the upper coil winding 5 to vary the stiffness of the damper. When the vibration damper is compressed, the distance between the upper permanent magnet and the lower permanent magnet is changed, the distance is reduced, the magnetic field is enhanced, the distance is increased, the magnetic field is weakened, and the changing magnetic field of the vibration damper is also superposed on the elastic body. The rigidity of the magnetorheological elastomer is also increased as the load of the shock absorber is increased and the magnetic field intensity between the upper permanent magnet and the lower permanent magnet is increased, so that the rigidity change of the shock absorber achieves the vibration reduction effect of active and passive integrated control.
The rigidity and the damping of each shock absorber are changed, so that the rigidity and the damping of the semi-active control multi-dimensional shock absorption seat in the six-degree-of-freedom direction are continuously adjusted along with the change of vibration excitation, and the seat mechanism has the optimal shock absorption effect when the vehicle runs under various working conditions.
The downside of upper platform 27 is provided with upper hinge table 28, is provided with upper hinge ball 29 on the upper hinge table 28, and the upside of lower platform 31 is provided with lower hinge table 32, is provided with lower hinge ball 33 on the lower hinge table 32, and shock absorber upper cover 2 is connected with upper hinge ball 29 through last mounting hole 1, and shock absorber front guide arm 34 is connected with lower hinge ball 33 through lower mounting hole 22.
The damper front guide rod 34 includes: the vibration damper comprises a vibration damper sleeve 4, an extrusion type magnetorheological elastomer 7, an upper coil winding 5, two permanent magnets 6 and a force transmission spring 9. The damper rear guide 30 includes: the damper cylinder 10, the damper piston 13, the flow control disk 25, the stepper motor 23, the lower coil winding 16 and the floating piston 18.
The damper piston rod 3 is arranged in the damper sleeve 4 and penetrates through the two permanent magnets 6, the extruded magnetorheological elastomer 7, the force transmission spring 9 and the damper cylinder cover 11.
The damper piston rod 3 is sleeved with a force transmission spring 9, wherein the force transmission spring 9 is arranged on an upper spring chuck 8 and a lower spring chuck 8. The damper stiffness element comprises a permanent magnet 6 and an extruded magnetorheological elastomer 7, and the two spring chucks are respectively connected with the permanent magnet 6 and the damper cylinder cover 11. The extrusion type magnetorheological elastomer 7 is arranged between the two permanent magnets 6, and the two permanent magnets 6, the extrusion type magnetorheological elastomer 7 and the upper coil winding 5 wound on the inner wall of the shock absorber sleeve 4 serve as rigidity-changing elements.
The lower end of the damper piston rod 3 is inserted into the damper cylinder barrel 10 and connected with the damper piston 13, the upper part of the damper cylinder barrel 10 is connected with the damper cylinder cover 11, and a piston rod sealing ring 12 is arranged in the middle of the damper cylinder cover to ensure the sealing in the damper cylinder body. Two shock absorber piston sealing rings 17 are arranged on the upper and lower parts of the shock absorber piston 13 and are matched with the inner wall of the shock absorber cylinder barrel 10. Inside the piston a channel structure 14 is provided for the magnetorheological fluid to flow. A lower coil winding coil 16 is wound in the middle of the damper piston 13 for generating a magnetic field to achieve the purpose of variable damping. A floating piston 18 is mounted below the damper piston 13 to divide the interior of the damper cylinder into upper and lower portions. The upper half part is a damping-variable working cavity, wherein magnetorheological fluid 15 is filled as a working medium, and a floating piston sealing ring 19 is arranged on a floating piston 18 to isolate the magnetorheological fluid 15 in the upper working cavity from a lower air chamber 20. Below the floating piston 18 is a gas chamber 20, and the high pressure gas in the gas chamber 20 acts as a buffer and compensates for the volume difference created after the piston rod of the extension stroke of the shock absorber extends out of the working chamber, and the working process of the compression stroke is reversed.
As shown in fig. 2-3, by controlling the magnitude of the energizing current of the lower coil winding and generating magnetic fields of different magnetic induction intensities, the viscosity of the magnetorheological fluid passing through the piston channel is changed, thereby changing the damping of the shock absorber. The inside of the damper piston 13 is provided with a channel structure for magnetorheological fluid to flow, the lower part of the damper piston 13 is provided with a piston magnetorheological fluid through hole, and the piston magnetorheological fluid through hole 27 is communicated with the channel structure and the control disc magnetorheological fluid through hole 26. The stepping motor 23 arranged in the space above the damper piston 13 drives the flow control rod 24 and the flow control disc 25 below to rotate, and the superposition area of the magnetorheological fluid through hole 26 of the flow control disc and the magnetorheological fluid through hole of the piston below the piston is changed, so that the passing area of the magnetorheological fluid 15 when flowing through the damper piston 13 is changed, the damping of the damper is further changed, and the multistage adjustment of the damping of the damper is realized by combining the change of the energizing current of the lower coil winding 16.
According to the invention, the variable-rigidity variable-damping shock absorber based on the intelligent material is combined with the Stewart mechanism, and based on the Stewart parallel mechanism, one variable-rigidity variable-damping shock absorber is added into each branched chain of Stewart. When the damper works, the magnetic field environment around the magnetorheological elastomer 7 is changed by adjusting the current of the upper coil winding 5, so that the rigidity and the damping of the damper are changed, and finally six branched chains are combined to obtain the damper which can attenuate vibration in multiple directions and can adjust the rigidity and the damping of the damper according to vibration excitation change. When the vibration damper is compressed, the distance between the upper permanent magnet 6 and the lower permanent magnet 6 is changed, the distance is reduced, the magnetic field is enhanced, the distance is increased, the magnetic field is weakened, and the changing magnetic field of the vibration damper is also overlapped on the elastic body. The larger the load of the shock absorber is affected by the rule, the larger the magnetic field intensity between the upper permanent magnet 6 and the lower permanent magnet 6 is, and the larger the rigidity of the magnetorheological elastomer is, so that the rigidity change of the shock absorber achieves the vibration reduction effect of active and passive integrated control. Comprehensively utilizes the characteristics of working modes of the magnetorheological fluid material and the extrusion type magnetorheological elastomer material. The vibration signal of the seat mechanism is detected through the acceleration sensor, the control current is calculated and analyzed through the processor, the power-on current of the upper coil winding and the lower coil winding are respectively controlled, and then the intensity of the induction electromagnetic field is controlled. The rigidity of the magnetorheological elastomer is controlled by controlling the magnetic field of the lower coil, and the magnetorheological elastomer is extruded to be connected with the spring in series, so that the rigidity of the shock absorber is changed; the output damping force of the magnetorheological fluid is controlled by controlling the magnetic field of the upper coil, and the rigidity and the damping of each shock absorber are changed, so that the rigidity and the damping of the semi-active control multidimensional vibration damping seat in the six-degree-of-freedom direction are continuously adjusted along with the change of vibration excitation, and the seat mechanism has the optimal vibration damping effect when a vehicle runs under various working conditions.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "front", "rear", "upper", "lower", "inner", "outer", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The present invention is not limited to the above-described embodiments, and it is apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (7)
1. A multi-dimensional vibration reduction seat, comprising:
an upper platform (27) and a lower platform (31);
the front shock absorber guide rod (34) and the rear shock absorber guide rod (30), the front shock absorber guide rod (34) is sleeved at the front end of the rear shock absorber guide rod (30), the rear shock absorber guide rod (30) is hinged with the upper platform (27), and the front shock absorber guide rod (34) is hinged with the lower platform (31);
wherein the damper front guide rod (34) includes:
a damper sleeve (4);
an extruded magnetorheological elastomer (7) disposed within the damper sleeve (4);
an upper coil winding (5) which is arranged on the inner wall of the damper sleeve (4) and is wound around the extrusion type magnetorheological elastomer (7);
two permanent magnets (6) respectively arranged above and below the extrusion type magnetorheological elastomer (7); and
the upper end of the force transmission spring (9) is connected with the permanent magnet (6) arranged below the extrusion type magnetorheological elastomer (7), and the lower end of the force transmission spring (9) is connected with the rear guide rod (30) of the shock absorber;
the damper rear guide rod (30) includes:
the shock absorber cylinder barrel (10), the shock absorber sleeve (4) is sleeved at the upper end of the shock absorber cylinder barrel (10), and a shock absorber cylinder cover (11) is arranged on the top cover of the shock absorber cylinder barrel (10);
a damper piston (13) disposed in the damper cylinder (10), wherein a flow control rod (24) is disposed in the damper piston (13);
the flow control disc (25) is arranged at the bottom of the shock absorber piston (13) and is fixedly connected with the bottom end of the flow control rod (24); the flow control disc (25) is provided with a control disc magnetorheological fluid through hole (26);
a stepping motor (23) disposed in a space above the damper piston (13);
the lower coil winding (16) is wound at the middle part of the damper piston (13); and
the floating piston (18) is arranged in the shock absorber cylinder barrel (10) and is positioned below the shock absorber piston (13), the floating piston (18) divides the inner part of the shock absorber cylinder barrel (10) into an upper part and a lower part, wherein the upper part is a variable damping working cavity filled with magnetorheological fluid (15), the lower part is an air chamber (20), and compressed air is contained in the air chamber (20); and
a damper piston rod (3) which is arranged in the damper sleeve (4) and penetrates through the two permanent magnets (6), the extrusion type magnetorheological elastomer (7), the force transmission spring (9) and the damper cylinder cover (11), and the lower end of the damper piston rod (3) is inserted into the damper cylinder barrel (10) and connected with the damper piston (13);
the inner part of the damper piston (13) is provided with a channel structure for magnetorheological fluid to flow, the lower part of the damper piston (13) is provided with a piston magnetorheological fluid through hole, and the piston magnetorheological fluid through hole is communicated with the channel structure and the control disc magnetorheological fluid through hole (26); and is also provided with
The stepping motor (23) drives the flow control rod (24) and the flow control disc (25) to rotate, the superposition area of the magnetorheological fluid flow through hole (26) of the control disc and the magnetorheological fluid flow through hole (27) of the piston is changed, the damping of the shock absorber is further changed, and the damping of the shock absorber is adjusted in a multistage mode by combining the change of the energizing current of the lower coil winding (16).
2. The multidimensional damping seat according to claim 1, wherein a damper upper cover (2) is sleeved above the damper sleeve (4), the damper rear guide rod (30) is hinged with the upper platform (27) through the damper upper cover (2),
the lower part of the shock absorber cylinder barrel (10) is sleeved with a shock absorber lower cover (21), and the shock absorber front guide rod (34) is hinged with the lower platform (31) through the shock absorber lower cover (21).
3. Multidimensional damping seat according to claim 1, characterized in that the upper and lower ends of the force transfer spring (9) are connected with the permanent magnet (6) and the damper cylinder head (11) arranged below the extruded magnetorheological elastomer (7) by means of a spring chuck (8), respectively.
4. The multi-dimensional vibration damping seat according to claim 1, characterized in that a floating piston seal (19) is mounted on the floating piston (18) to isolate magnetorheological fluid (15) in a cavity above the floating piston (18) from the air chamber (20) below the floating piston (18).
5. The multi-dimensional vibration damping seat according to claim 1, characterized in that two vibration damping piston sealing rings (17) are mounted on the upper and lower parts of the vibration damping piston (13) respectively so as to be matched with the inner wall of the vibration damping cylinder (10).
6. The multi-dimensional vibration damping seat according to claim 1, characterized in that a piston rod sealing ring (12) is arranged in the middle of the vibration damper cylinder cover (11) to ensure the sealing of the vibration damper piston rod (3) and the vibration damper cylinder cover (11).
7. The multi-dimensional vibration damping seat according to claim 2, characterized in that an upper hinge table (28) is arranged on the lower side of the upper platform (27), an upper hinge ball (29) is arranged on the upper hinge table (28), a lower hinge table (32) is arranged on the upper side of the lower platform (31), a lower hinge ball (33) is arranged on the lower hinge table (32), the upper damper cover (2) is connected with the upper hinge ball (29) through an upper mounting hole (1), and the front damper guide rod (34) is connected with the lower hinge ball (33) through a lower mounting hole (22).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210716936.9A CN114940109B (en) | 2022-06-23 | 2022-06-23 | Multidimensional vibration reduction seat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210716936.9A CN114940109B (en) | 2022-06-23 | 2022-06-23 | Multidimensional vibration reduction seat |
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| CN114940109A CN114940109A (en) | 2022-08-26 |
| CN114940109B true CN114940109B (en) | 2024-02-13 |
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| CN110242696A (en) * | 2019-06-18 | 2019-09-17 | 天津大学 | A kind of variable damper control method of multistage controllable variable damping damper |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102015214460B4 (en) * | 2015-07-30 | 2017-03-09 | Schaeffler Technologies AG & Co. KG | Elastic suspension handlebar for a vehicle |
| EP3393850B1 (en) * | 2015-12-21 | 2022-02-16 | LORD Corporation | Improved seat-damping devices, systems, and methods |
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| CN101519111A (en) * | 2009-04-03 | 2009-09-02 | 哈尔滨工程大学 | Magneto-rheological elastomer intelligent damper for ship |
| WO2019011040A1 (en) * | 2017-07-13 | 2019-01-17 | 盐城市步高汽配制造有限公司 | Double-cylinder magnetorheological damper having inner and outer double coils |
| CN108275039A (en) * | 2018-02-13 | 2018-07-13 | 天津大学 | A kind of engineering machinery shock absorbing seat based on Stewart mechanisms and intellectual material |
| CN108412940A (en) * | 2018-03-23 | 2018-08-17 | 合肥工业大学 | A kind of Kind of MR Hydraulic Actuator damping stepless adjustable damper |
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