CN114435206B

CN114435206B - Variable-rigidity variable-damping magnetorheological seat suspension with vibration-damping and impact-resisting combined function

Info

Publication number: CN114435206B
Application number: CN202210077201.6A
Authority: CN
Inventors: 杨健; 孙帅帅; 张世武; 龚兴龙; 巩宁
Original assignee: Anhui University
Current assignee: Anhui University
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-11-08
Anticipated expiration: 2042-01-24
Also published as: CN114435206A

Abstract

The invention discloses a variable-rigidity variable-damping magnetorheological seat suspension with a vibration-damping and impact-resisting combined function. The self-induction self-power supply component is mainly realized by a high-speed generator; the variable-stiffness variable-damping rotary damper comprises an outer damping unit, an inner damping unit, a torsion spring and a spring seat; two sides of the base are respectively provided with a shear type structure which is respectively used for assembling the variable-rigidity variable-damping rotary damper and the self-induction self-powered component. The variable-rigidity variable-damping seat suspension can realize variable rigidity and variable damping simultaneously so as to further improve the vibration damping performance of the seat suspension, and can collect vibration energy and convert the vibration energy into electric energy to realize self-power supply. In addition, the invention can quickly and effectively respond to the impact load, and simultaneously realizes the compactness of the structure and reduces the cost. The invention can meet the technical requirements of various vehicles and other transportation means on protecting drivers and passengers, and has wide application prospect.

Description

Variable-rigidity variable-damping magnetorheological seat suspension with vibration-damping and impact-resisting combined function

Technical Field

The invention relates to a variable-stiffness variable-damping magnetorheological seat suspension with a vibration-damping and impact-resisting combined function, belongs to the field of vibration and impact control, and particularly belongs to the technical field of automobile suspensions.

Background

Vibration and impact caused by wave impact or even explosion devices encountered by military vehicles and suffered by the fishing boat sailing at high speed and excited by the irregularity of the road surface, the vibration of the engineering machinery body and the vibration and the impact can be transmitted to the body of a driver through a seat suspension, so that the comfort and the safety of the driver are greatly reduced. According to some national data statistics, about 13% of workers are subjected to vibration in workplaces, and prolonged exposure to vibration has led to neck/shoulder pain, lumbar and back injuries, spinal injuries and other musculoskeletal diseases. Therefore, much attention should be paid to the protection of the occupants in the fields of vehicles, aircrafts, and the like. The seat suspension is arranged between a vehicle body and a driver and is an important part for finishing vibration reduction and impact resistance, so that the development of a novel seat suspension to improve the vibration reduction and impact resistance of the novel seat suspension is an effective means for realizing higher protection for drivers and passengers and is also urgently needed.

At present, a semi-active seat suspension based on magnetorheological fluid has become a hot point at present due to the fact that the semi-active seat suspension is simple in structure, stable in system and high in reliability, and can provide controllable damping force, so that an ideal vibration reduction effect is achieved. In recent years, in order to improve both the damping performance and the impact resistance of seat suspensions, more and more seat suspension design concepts based on magnetorheological technology have been proposed. For example, a Mcmaus team prepares a magnetorheological damper for a seat and tests the seat on a servo hydraulic vibration exciter, and the test result shows that the semi-active seat suspension can effectively damp vibration and has good impact resistance. The Choi and Wereley teams propose an optimal control algorithm for controlling magnetorheological seat suspensions to attenuate the dynamic response of the human body to shock and vibration loads. Bai and Yang et al have designed a magnetorheological damper that includes a hybrid controller that can suppress both shock and vibration, and verified its effectiveness through a series of theoretical simulations. From the research results, the seat suspension based on the magneto-rheological technology can simultaneously improve the vibration damping performance and the shock resistance through reasonable design and algorithm. However, the current magnetorheological seat suspensions cannot completely meet the requirements of various vehicles and other vehicles on the seat suspensions under complex working conditions due to the limitations of the current magnetorheological seat suspensions, and the current magnetorheological seat suspensions also have great performance improvement spaces. This is mainly because: 1) Due to the unpredictability of the excitation signal frequency, it is highly likely to resonate with the seat suspension. The traditional magneto-rheological seat suspension can only change damping but not rigidity, so that the natural frequency of a seat cannot be changed, and resonance between the seat and excitation cannot be avoided by frequency shift; 2) Under rapid impact stimuli, such as landmine explosions, military vehicles, anti-terrorist vehicles and helicopters, the seat suspension is required to respond quickly to protect the driver, whereas the conventional magnetorheological seat suspension requires an external power supply and a control loop to cause a response delay, which substantially reduces the ability of the seat to dissipate high-speed impact energy. Therefore, the traditional magnetorheological damper only capable of realizing variable damping cannot meet the high-performance requirements of vehicles, ships and helicopters on the seat suspension, and the variable-rigidity variable-damping seat suspension becomes a current research hotspot as an effective means for further improving the vibration reduction performance of the seat suspension. In order to promote the further development and application of the prior art, the novel seat suspension provided by the item not only can realize the rapid dissipation of vibration energy through the variable damping characteristic, but also can change the natural frequency of the seat suspension through the variable rigidity characteristic so as to avoid the seat resonance, thereby further improving the vibration damping performance of the seat suspension. In addition, the present invention realizes the damping-velocity negative correlation characteristic. The characteristic can ensure that the seat suspension can provide the maximum damping force no matter under high-speed impact or low-speed impact, thereby ensuring that the maximum energy dissipation rate can be kept under impact excitation of different speeds, and further improving the impact resistance of the seat suspension.

Disclosure of Invention

The technical problem solved by the invention is as follows: the variable-rigidity variable-damping magnetorheological seat suspension with the vibration and impact resistant composite function provided by the invention not only can realize the rapid dissipation of vibration energy through the variable-damping characteristic, but also can change the natural frequency of the seat suspension by the variable-rigidity characteristic, so that the seat resonance is avoided, and the vibration damping performance of the seat suspension is further improved. In addition, the damping-speed negative correlation characteristic of the invention can ensure that the seat suspension can provide the maximum damping force no matter under high-speed impact or low-speed impact, thereby ensuring that the maximum energy dissipation rate can be kept under impact excitation of different speeds, and further improving the shock resistance of the seat suspension.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a become rigidity and become damping magnetic current becomes seat suspension with compound function of shock attenuation and shock resistance which characterized in that includes: the self-induction self-powered damping device comprises a base, a self-induction self-powered part and a variable-rigidity variable-damping rotary damper;

the self-induction self-powered part is responsible for collecting vibration and impact energy, converting the vibration and impact energy into electric energy and supplying power to the variable-rigidity variable-damping rotary damper, and is realized by a high-speed generator which comprises an input shaft, a two-stage planetary reducer, a stator and a rotor; the two-stage planetary speed reducers are connected in series, each stage of planetary speed reducer comprises a gear ring, a planetary carrier, a planetary gear and a sun gear, wherein a shaft on the primary planetary carrier is an input shaft, a shaft of the primary sun gear is connected with the secondary planetary carrier, and a shaft on the secondary sun gear is used as an output shaft; the two-stage planetary reducer is fixedly connected with the stator through a gear ring and fixedly connected with the rotor through an output shaft.

The variable-stiffness variable-damping rotary damper comprises an outer damping unit, an inner damping unit, a torsion spring and a spring seat. The outer damping unit comprises an outer damper cylinder, an outer damping unit magneto-rheological bearing and an outer damping unit electromagnetic coil; the inner damping unit comprises a central shaft, a permanent magnet, an inner damper cylinder, an inner damping unit magneto-rheological bearing and an inner damping unit electromagnetic coil; the magneto-rheological fluid is filled in the magneto-rheological bearing of the outer damping unit and the magneto-rheological bearing of the inner damping unit, and based on the magneto-rheological effect, when the currents led into the electromagnetic coil of the outer damping unit and the electromagnetic coil of the inner damping unit are increased, the magneto-rheological bearings of the inner damping unit and the outer damping unit can output large torque, and otherwise, small torque is output. The central shaft consists of three sections, and the permanent magnet is used as the middle section of the central shaft; the introduction and installation positions of the permanent magnets provide an initial magnetic field for the magnetorheological bearings of the inner damping unit, and based on the rheological property of the magnetorheological fluid, compared with the condition without the initial magnetic field, the initial torque of the magnetorheological bearings of the inner damping unit is increased, so that a foundation and a condition are provided for realizing the damping-speed negative correlation property of the magnetorheological bearing. One end of the central shaft is used as an input end for receiving vibration and impact excitation signals, and the other end of the central shaft is fixed at the central position of the spring seat; one end of the torsion spring is fixedly connected with the outer damper cylinder, the other end of the torsion spring is fixed on the spring seat, and when the spring seat and the outer damper cylinder rotate relatively, the torsion spring can deform. The outer damping unit and the inner damping unit are coaxially assembled, the outer damping unit is sleeved outside the inner damping unit in a ring mode, the inner damping unit serves as a central shaft of the outer damping unit, and the outer damping electromagnetic coil is wound on the inner damper cylinder. The design is beneficial to realizing the variable stiffness and variable damping characteristics in function, a compact structure is formed in the structure, and the space utilization rate is improved.

The base comprises two scissor structures which are distributed on two sides of the base, and the scissor structures are cross structures which are formed by hinging two beams together at the middle position so that the two beams can rotate relatively; the shear type structure on one side is provided with a variable-rigidity variable-damping rotary damper, a central shaft of the inner damping unit is fixed with one beam of the shear type structure, and an outer damper cylinder of the outer damping unit is fixed with the other beam; the scissor structure on the other side is assembled with a self-induction self-power supply part; when the seat is subjected to vertical vibration, the two beams of the shear type structure rotate relatively to drive the variable-rigidity variable-damping rotary damper and the high-speed generator to rotate, and in the condition, the linear motion in the vertical direction is converted into the rotary motion of the variable-rigidity variable-damping rotary damper and the high-speed generator.

The working process of the invention is as follows:

when vibration and impact in the vertical direction act on the damping device, two beams of the shear type structures on the two sides of the base rotate relatively, so that linear motion in the vertical direction is converted into rotary motion of the variable-rigidity variable-damping rotary damper and the high-speed generator. The rotational motion from the input shaft will be amplified by the planetary reducer to drive the rotor; then the relative movement between the rotor and the stator is amplified by the two-stage planetary reducer and more electric energy is generated to supply the variable-rigidity variable-damping rotary damper, and the more the impact speed on the input shaft is, the more electric energy is generated. This direct power mode may improve the response speed of the present invention.

The variable damping characteristic of the variable-rigidity variable-damping rotary damper is realized based on the rheological characteristic of the magnetorheological fluid: when a large current is supplied to the inner damping unit, the output damping force of the variable-rigidity variable-damping rotary damper is increased; when the supply current is small, the output damping force becomes small. The present invention can provide not only variable damping but also variable stiffness. Under the excitation action of external vibration or impact, the central shaft of the inner damping unit receives torsional motion caused by the external vibration or impact and transmits the torsional motion to the spring seat, and the spring seat transmits the motion to the outer damper cylinder through the torsion spring. In the process, the inner damping unit is mainly responsible for realizing the variable damping characteristic of the seat suspension, namely the output torque of the inner damping magnetorheological bearing is changed by controlling the current acting on the inner damping electromagnetic coil; the external damping unit is fixedly connected with the torsion spring, and the rigidity controllability of the invention is realized by controlling the current acting on the external magnetic rheological bearing: when the damping of the magnetorheological fluid in the external damping magnetorheological bearing is very small, namely acting force caused by external excitation cannot be overcome, the external damper cylinder and the internal damping unit are easy to move relatively under the action of the external excitation, the torsion spring cannot deform at the moment, and the suspension frame has the minimum rigidity; when the damping of the outer damping unit is large enough, namely, the acting force caused by external excitation can be overcome, the inner damping unit and the outer damping unit cannot rotate relatively, so that the outer damping unit is still, the torque generated by the torsion spring cannot overcome the damping force, the torsion spring deforms, and the whole variable-stiffness variable-damping rotary damper has large stiffness. Other stiffness values between these two extremes of stiffness may be achieved by adjusting the current applied to the outer damping magnetorheological bearing. Meanwhile, the variable rigidity and the variable damping can realize the rapid dissipation of vibration energy, and the variable rigidity characteristic can change the natural frequency of the seat suspension to avoid the resonance of the seat, thereby further improving the vibration damping performance of the seat suspension.

When the excitation signal is an impact signal, the damping-speed negative correlation characteristic is realized by combining a self-induction self-powered technology based on the principle that a permanent magnetic field and an electromagnetic field can be superposed. The permanent magnet positioned on the central shaft can provide an initial permanent magnetic field for the inner damping magnetorheological bearing, so that the inner damping magnetorheological bearing has an initial damping, when impact excitation acts on a self-generating unit of the seat suspension, the generated electric energy enables the inner damping electromagnetic coil to be powered, and the direction of an electromagnetic field generated by the inner damping electromagnetic coil is opposite to that of the permanent magnetic field, which means that the total magnetic field acting on the inner damping magnetorheological bearing is reduced along with the increase of control current. That is, the current caused by the impact velocity will cancel a part of the permanent magnetic field inside the inner damping unit, thereby reducing the overall suspension damping; conversely, under the excitation of low impact velocity, the overall damping of the seat suspension will remain large, i.e. the inverse design of the permanent magnetic field and the electromagnetic field realizes the inverse relation of the damping and the impact velocity. Since the damping force is the product of the impact velocity and the damping, the inverse relationship between the impact velocity and the damping enables the seat suspension to maintain the maximum allowable damping force at different impact velocities, i.e. the maximum energy dissipation capacity can be ensured without damaging mechanical parts. Meanwhile, due to the introduction of the self-induction self-power supply assembly, the delay of a control loop is avoided, so that the electric energy generated under impact excitation can directly act on the variable-rigidity variable-damping rotary damper, the response speed of the seat suspension system to impact load is increased, and the energy dissipation rate of the seat suspension system is greatly increased.

The voltage signal generated by the self-induction self-power supply component can directly reflect the information of the vibration signal, and convenience is provided for subsequent controller development.

The direction of the magnetic field generated by the inner damping electromagnetic coil is opposite to the direction of the permanent magnetic field, so that the total magnetic field acting on the inner magneto-rheological bearing is reduced along with the increase of the supplied current.

The magnetorheological bearing saves space and magnetorheological fluid, can provide higher torque (10N cm), realizes quick and continuous controllability, and provides favorable conditions for reducing the volume and improving the performance of the damper.

In order to avoid leakage of the magnetorheological fluid in the bearing, the magnetorheological fluid is injected into a bearing gap and then sealed by bearing sealing fluid (magnetorheological 126-2 RS).

The magnetorheological fluid shows rheological characteristics within microseconds after being electrified, so that the magnetorheological damping unit can output controllable damping force within microseconds, namely when the applied current is large, the output damping force of the magnetorheological damping unit is increased, otherwise, the output damping force is decreased, the output controllable damping force is cooperated with the main force output by the linear motor through real-time adjustment, and the vibration damping performance of the vibration damping system is further improved.

The two-stage planetary reduction gearbox is designed in the high-speed generator, so that the relative rotating speed between the stator and the rotor of the high-speed generator is improved, and the power generation capacity of the high-speed generator is improved.

The invention has the advantages and positive effects that:

(1) The invention is based on the magneto-rheological semi-active technology, has simple structure, stable performance, strong reliability and low maintenance cost, can provide controllable damping force so as to achieve an ideal vibration damping effect, does not need large energy consumption and expensive hardware facilities, and greatly reduces the development cost.

(2) The introduction of the self-induction self-powered component avoids the delay of a control loop, so that the electric energy generated under impact excitation can directly act on the damper, the response speed of the system to impact load is increased, and the energy dissipation rate of the system is greatly increased. In addition, the integrated design of the self-induction self-powered component can greatly reduce the hardware cost and the maintenance difficulty.

(3) In the invention, the combination of variable damping and variable stiffness greatly improves the vibration damping performance of the seat suspension. On the one hand, the damping controllability realizes effective energy dissipation; on the other hand, by adjusting the rigidity to realize a vibration damping mechanism called resonance avoidance control, resonance between the seat and the excitation can be avoided. By means of such a combined mechanism, a minimum vibration transmissibility can be ensured. Therefore, the development of this new seat suspension will provide a higher level of vibration damping and lead to better ride comfort.

(4) The seat suspension proposed by the invention has a damping-speed negative correlation characteristic of speed dependence, namely that the impact speed and the damping are in inverse proportion. The unique point is that the magnetorheological damper which can be damped and softened is directly driven by skillfully utilizing self-induction energy. In this way, the damping force (the product of damping and impact velocity) will maintain the maximum allowable damping force over a large velocity range, thereby maximizing energy dissipation efficiency without the need for control loop delays and external power consumption during the entire impact excitation.

Drawings

FIG. 1 is a schematic structural view of a variable-stiffness variable-damping rotary damper of a variable-stiffness variable-damping magnetorheological seat suspension with combined vibration and impact damping functions according to the present invention;

FIG. 2 is a schematic structural diagram of a self-powered inductive component of a variable stiffness and damping magnetorheological seat suspension with combined vibration and impact damping functions according to the present invention;

FIG. 3 is a diagram showing the assembly relationship of the base structure and the components of the variable stiffness and damping magnetorheological seat suspension with the combined functions of vibration reduction and impact resistance.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

The invention is applied to seat suspensions for various vehicles, ships and aircraft vehicles, which are installed between a vehicle body and a seat. The combination of variable damping and variable rigidity greatly improves the vibration damping performance of the seat suspension through effective energy dissipation and resonance evasion control, and the damping-speed negative correlation characteristic of the combination enables the seat suspension to keep the maximum allowable damping force at different impact speeds, namely, the combination can ensure the maximum energy consumption capability without damaging mechanical parts.

As shown in fig. 1, the variable-stiffness and variable-damping rotary damper comprises a central shaft 1, an inner damper cylinder 2, a permanent magnet 3, an outer damping electromagnetic coil 4, an outer damping magnetorheological bearing 5, an inner damping electromagnetic coil 6, an outer damper cylinder 7, an inner damping magnetorheological bearing 8, a torsion spring 9 and a spring seat 10. After the magnetorheological fluid is injected into the outer damping magnetorheological bearing 5 and the inner damping magnetorheological bearing 8, the bearing seal (magnetorheological 126-2 RS) is used for sealing. The central shaft 1 consists of three sections, and the permanent magnet 3 serves as the middle section of the central shaft; one end of the central shaft 1 serves as an input end to receive vibration and impact excitation signals, and the other end of the central shaft is fixed at the central position of the spring seat 10; one end of a torsion spring 9 is fixedly connected with the outer damper cylinder 7, and the other end of the torsion spring is fixed on a spring seat 10; the outer damping unit and the inner damping unit are coaxially assembled, the outer damping unit is sleeved outside the inner damping unit in a ring mode, the inner damping unit serves as a central shaft of the outer damping unit, and the outer damping electromagnetic coil 4 is wound on the inner damper cylinder 2.

As shown in fig. 2, the self-induction self-powered component is realized by a high-speed generator, and comprises a rotor 11, a stator 12, an input shaft 14, a primary planetary reducer 23 and a secondary planetary reducer 24, wherein the primary planetary reducer 23 comprises a primary planet wheel 13, a primary gear ring 15, a primary planet carrier 16, a primary sun wheel 17, the secondary planetary reducer 24 comprises a secondary planet wheel 18, a secondary gear ring 19, a secondary planet carrier 20, a secondary sun wheel 21, and the two-stage planetary reducers are connected in series, wherein a shaft on the primary planet carrier 16 is the input shaft 14, a shaft of the primary sun wheel 17 is connected with the secondary planet carrier 20, and a shaft on the secondary sun wheel 21 is used as an output shaft 22; the two-stage planetary gear unit is fixedly connected to the stator 12 via the primary ring gear 15 and the secondary ring gear 19, and is fixedly connected to the rotor 11 via the output shaft 22. The voltage signal generated by the self-induction self-powered component can directly reflect the information of the vibration signal and serve as an input signal of the suspension controller.

Fig. 3 is a diagram showing the base structure and the assembly relationship of each component of the variable stiffness and damping magnetorheological seat suspension with combined vibration and impact damping and shock absorption functions according to the present invention, which includes a structural diagram of the variable stiffness and damping rotational damper in fig. 1, a structural diagram of the self-induction self-powered component in fig. 2, and a structural diagram of the base. FIG. 3 shows the assembly of the variable stiffness and damping rotational damper and the self-powered inductive element mounted on either side of the base.

The base comprises two sets of

scissor structures

25, 26. Each scissor structure is a cross structure formed by two beams hinged together at an intermediate position such that the two beams can pivot relative to each other. Wherein the variable stiffness variable damping rotary damper is fixed with one beam of the scissor-type structure 25 through the central shaft 1, is fixed with the other beam of the scissor-type structure 25 through the outer damper cylinder 7, and is fixed with the self-induction self-powered component and the scissor-type structure 26 on the other side.

This embodiment example is to apply the present invention to a seat suspension of an anti-terrorist vehicle. In addition to high speed travel on complex road conditions, anti-terrorist vehicles are also likely to be subjected to explosive blasts from explosives or mines which can significantly impair the comfort and safety of occupants and thus reduce their battle effectiveness, or even threaten their lives. Therefore, the anti-terrorist vehicle is subjected to both vibration excitation and impact excitation signals during traveling.

When the anti-terrorist vehicle runs at a high speed on a complex road condition, the vehicle can suffer from vibration caused by uneven road surface, the vibration can be transmitted to the seat through the vehicle body, and when the seat suffers from vertical vibration, the two cross beams of the

scissor structures

25 and 26 respectively rotate relatively, so that the variable-rigidity variable-damping rotary damper and the high-speed generator are driven to rotate. In this case, the linear motion in the vertical direction is converted into the rotational motion of the variable stiffness and damping rotational damper and the high speed generator. The rotational motion from the input shaft 14 is amplified by the primary planetary reducer 23 and the secondary planetary reducer 24 to drive the rotor 11; the relative motion between the rotor 11 and the stator 12 will then be amplified and more electrical energy will be generated to supply the variable stiffness and variable damping rotational damper, the greater the impact velocity experienced by the input shaft 14, the more electrical energy will be generated. This direct power mode may improve the response speed of the present invention. Under the vibration excitation, the electric energy generated by the self-induction self-powered assembly can directly supply power to the inner damping electromagnetic coil 6 and the outer damping electromagnetic coil 4, so that the rheological characteristics of the magnetorheological fluid in the inner damping magnetorheological bearing 8 and the outer damping magnetorheological bearing 5 are changed, the damping controllability is shown, and the purpose of effectively dissipating vibration energy is achieved; the central shaft 1 of the inner damping unit receives a torsional motion caused by external vibration or impact and transmits it to the spring seat 10, and the spring seat 10 transmits the motion to the outer damper cylinder 7 through the torsion spring 9. When the damping of the magnetorheological fluid in the outer damping unit is small, namely the acting force caused by external excitation cannot be overcome, the outer damper cylinder 7 and the inner damping unit are easy to move relatively, the torsion spring 9 cannot deform at the moment, and the overall rigidity reaches the minimum value. Alternatively, when the damping of the outer damping unit is large enough to overcome the force of the external excitation, the moment generated by the torsion spring 9 cannot overcome the damping force, so that the outer damping unit is stationary, and the torsion spring 9 is deformed, so that the entire variable-stiffness and variable-damping rotary damper exhibits a large stiffness. Other stiffness values between these two extremes of stiffness may be achieved by adjusting the applied current. Thus, the variable rigidity is realized to achieve the purpose of reducing the vibration transmission rate. The ideal current values of the inner damping unit and the outer damping unit can be obtained through a robust control algorithm and a frequency control algorithm based on short-time Fourier change.

When an anti-terrorist vehicle is subjected to an explosive shock caused by an explosive or a mine, the damping-velocity negative correlation characteristic of the invention plays an important role in dissipating the shock energy. Because the permanent magnet 3 provides an initial magnetic field to enable the magnetorheological fluid to have initial large damping, after impact excitation acts on a self-induction self-powered component of the seat suspension, the electric energy generated by the self-induction self-powered component enables the inner damping electromagnetic coil 6 to be powered, the direction of the generated electromagnetic field is opposite to that of the permanent magnetic field, and the total magnetic field acting on the magnetorheological fluid of the inner damping unit is reduced along with the increase of control current. Specifically, a large current caused by high impact speed can counteract a part of magnetic fields in the magnetorheological damper, so that the overall suspension damping is reduced; conversely, under the excitation of low impact speed, the overall damping of the seat suspension can be kept large, namely the reverse design of the permanent magnetic field and the electromagnetic field realizes the inverse relation of the damping and the impact speed. Since the damping force is the product of the impact velocity and the damping, the seat suspension is able to maintain the maximum allowed damping force at different impact velocities, i.e. is able to guarantee maximum energy dissipation capacity without damaging mechanical parts. Meanwhile, due to the introduction of the self-induction self-powered assembly, the delay of a control loop is avoided, so that the electric energy generated under impact excitation can directly act on the internal damping unit, the response speed of the system to impact load is increased, and the energy dissipation rate of the system is greatly increased. That is to say, when the anti-terrorist vehicle is impacted by different degrees, the anti-terrorist vehicle can timely and effectively dissipate impact energy, thereby achieving the purpose of protecting the vehicle and drivers and passengers.

In the above description of the technical solutions in the embodiments of the present invention, it is obvious that the described embodiments are some embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Claims

1. The utility model provides a become rigidity and become damping magnetic current becomes seat suspension with compound function of shock attenuation and shock resistance which characterized in that includes: the device comprises a base, a self-induction self-powered part and a variable-rigidity variable-damping rotary damper;

the self-induction self-powered part is used for collecting vibration and impact energy and converting the vibration and impact energy into electric energy, and the electric energy directly supplies power to the variable-rigidity variable-damping rotary damper; in addition, the voltage signal generated by the self-induction self-power supply component directly reflects the information of the vibration signal; the self-induction self-powered part is realized by a high-speed generator, and the high-speed generator comprises an input shaft, a two-stage planetary reducer, a stator and a rotor; the two-stage planetary speed reducers are connected in series, each stage of planetary speed reducer comprises a gear ring, a planetary carrier, a planetary gear and a sun gear, wherein a shaft on the primary planetary carrier is an input shaft, a shaft on the primary sun gear is connected with the secondary planetary carrier, and a shaft on the secondary sun gear is an output shaft; the two-stage planetary reducer is fixedly connected with the stator through a gear ring and is fixedly connected with the rotor through an output shaft;

the variable-stiffness variable-damping rotary damper comprises an outer damping unit, an inner damping unit, a torsion spring and a spring seat; the outer damping unit comprises an outer damper cylinder, an outer damping magnetorheological bearing and an outer damping electromagnetic coil; the inner damping unit comprises a central shaft, a permanent magnet, an inner damper cylinder, an inner damping magneto-rheological bearing and an inner damping electromagnetic coil; the magnetorheological fluid is filled in the outer damping magnetorheological bearing and the inner damping magnetorheological bearing; after the outer damping electromagnetic coil is electrified, a controllable magnetic field is provided for the magnetorheological fluid in the outer damping magnetorheological bearing; the central shaft consists of three sections, and the permanent magnet serves as the middle section of the central shaft; the introduction and installation positions of the permanent magnet provide an initial magnetic field for the inner damping magnetorheological bearing, and the initial magnetic field and an electromagnetic field generated by the inner damping electromagnetic coil are superposed to jointly control the rheological property of the inner damping unit; one end of the central shaft is used as an input end for receiving vibration and impact excitation signals, and the other end of the central shaft is fixed at the central position of the spring seat; one end of the torsion spring is fixedly connected with the outer damper cylinder, the other end of the torsion spring is fixed on the spring seat, and when the spring seat and the outer damper cylinder rotate relatively, the torsion spring can deform; the outer damping unit and the inner damping unit are coaxially assembled, the outer damping unit is annularly sleeved outside the inner damping unit, the inner damping unit serves as a central shaft of the outer damping unit, and the outer damping electromagnetic coil is wound on the inner damper cylinder;

the base comprises two scissor-type structures and is distributed on two sides of the base, the scissor-type structures are cross structures which enable the two beams to rotate relatively by hinging the two beams at the middle positions, wherein the scissor-type structure on one side is provided with a variable-rigidity variable-damping rotary damper, a central shaft of the inner damping unit is fixed with one beam of the scissor-type structures, and an outer damper cylinder of the outer damping unit is fixed with the other beam of the scissor-type structures; the scissor structure on the other side is assembled with a self-induction self-powered part; when the seat is subjected to vertical vibration, the two beams of the shear type structure rotate relatively to drive the variable-rigidity variable-damping rotary damper and the high-speed generator to rotate, and in the condition, the linear motion in the vertical direction is converted into the rotary motion of the variable-rigidity variable-damping rotary damper and the high-speed generator.

2. The variable-stiffness variable-damping magnetorheological seat suspension with the vibration-damping and impact-resisting compound function as claimed in claim 1, wherein: the rigidity controllability is realized by controlling the current acting on the external damping magnetorheological bearing: when the damping of the magnetorheological fluid in the outer damping magnetorheological bearing is not enough to overcome the acting force caused by external excitation, the outer damper cylinder and the inner damping unit are easy to move relatively, the torsion spring cannot deform at the moment, and the suspension frame has the minimum rigidity at the moment; when the damping of the outer damping unit can overcome the acting force caused by external excitation, the inner damping unit and the outer damping unit cannot rotate relatively, so that the torsion spring deforms, and the whole variable-stiffness variable-damping rotary damper has high stiffness; other stiffness values between these two extremes of stiffness may be achieved by adjusting the current applied to the outer damping magnetorheological bearing.

3. The variable-stiffness variable-damping magnetorheological seat suspension with the vibration-damping and impact-resisting compound function as claimed in claim 1, wherein: the direction of a magnetic field generated by the inner damping electromagnetic coil is opposite to that of a permanent magnetic field, and the total magnetic field acting on the inner damping magnetorheological bearing is reduced along with the increase of the supplied current.

4. The variable-stiffness variable-damping magnetorheological seat suspension with the vibration-damping and impact-resisting compound function as claimed in claim 1, wherein: in the internal damping unit, the inverse design of the permanent magnetic field and the electromagnetic field realizes the inverse relation of the damping and the impact speed; since the damping force is the product of the impact velocity and the damping, the inverse relationship between the impact velocity and the damping enables the seat suspension to maintain the maximum allowable damping force at different impact velocities, i.e. the maximum energy dissipation capacity can be ensured without damaging mechanical parts.

5. The variable-stiffness variable-damping magnetorheological seat suspension with the vibration-damping and impact-resisting compound function as claimed in claim 1, wherein: in order to avoid leakage of the magnetorheological fluid in the bearing, the magnetorheological fluid is injected into a bearing gap and then sealed by bearing sealing fluid.