CN104802680A - Semi-active type vehicle seat vibration absorbing device with magneto-rheological elastomer - Google Patents

Abstract

A semi-active magnetorheological elastomer vehicle seat vibration damping device, which includes a lower excitation coil, a working cylinder, a magnetorheological elastomer, an upper excitation coil, a coil spring, a protective cover, a sealing ring, an upper support, and a piston Rod, piston, adjusting gasket, compression nut, upper excitation core, lower excitation core, control line, controller, signal line, vehicle height sensor, magnetic isolation base plate, lower support. The excitation coil and the excitation core as the electromagnetic field loading source are installed in the working cylinder, and the magnetorheological elastomer is located between the upper and lower excitation cores; the vehicle height sensor transmits the vibration signal of the vehicle body to the controller; the controller can change the vibration signal through the control line. The magnitude of the current in the excitation coil causes the strength of the magnetic field in the excitation coil and the excitation core to change, thereby adjusting the stiffness and damping of the magnetorheological elastomer in real time; the coil spring can assist the vibration damping device to absorb and reduce vibration energy. Through the joint action of fixed stiffness and damping coil spring and adjustable stiffness and damping magnetorheological elastomer, a semi-active magnetorheological elastomer vehicle seat vibration damping device is provided to improve the driving comfort of the vehicle .

Description

A semi-active magneto-rheological elastomer vehicle seat vibration damping device

technical field

The invention relates to a vehicle seat damping device with adjustable stiffness and damping, in particular to a semi-active magneto-rheological elastomer vehicle seat damping device, which uses a new type of intelligent composite material - magnetic The rheological elastomer is used as a damping medium and belongs to the technical field of vehicle damping and safety protection.

Background technique

With the development of my country's vehicle industry and the improvement of residents' living standards, more and more attention has been paid to the ride comfort of vehicles. The design of vehicle seats directly affects the ride comfort of the driver and passengers. Seats with poor damping performance may cause driver fatigue and occupational diseases, and even affect the driving safety of the vehicle. Vibration and vibration absorption become an important part of vehicle design. At present, most of the vehicle seat shock absorbers are passive hydraulic shock absorbers or coil spring shock absorbers, which cannot adjust the stiffness and damping, and have poor comfort; while the active airbag shock absorbers have complex structures and high production and maintenance costs. In recent years, the rapid development of new intelligent materials of magnetorheological elastomers has provided new ideas for vehicle design and manufacturing. Magnetorheological elastomers are smart composite materials that can adjust stiffness and damping by changing the strength of the electromagnetic field, and can be used to develop structures with adaptive stiffness and damping properties. Moreover, the magnetorheological elastomer also has the advantages of fast response (on the order of milliseconds), good stability, no need for sealing, and convenient use.

Contents of the invention

1. Purpose of the invention:

The object of the present invention is to provide a semi-active magneto-rheological elastomer vehicle seat vibration damping device, mainly based on the extrusion working mode of the magnetorheological elastomer, and judge the vibration amplitude and frequency of the vehicle body through the signal of the vehicle height sensor. Change the strength and presence or absence of the electromagnetic field to adjust the stiffness and damping of the magneto-rheological elastomer, improve the ride comfort and safety of the vehicle seat, and improve the driving experience of the vehicle.

2. Technical solution:

Utilizing the characteristics of adjustable stiffness and damping of magnetorheological elastomer smart materials, it is a semi-active magnetorheological elastomer vehicle seat vibration damping device controlled by the change of electromagnetic field strength and presence or absence. See the attached drawing. The device includes a lower excitation coil, a working cylinder, a magnetorheological elastomer, an upper excitation coil, a coil spring, a protective cover, a sealing ring, an upper support, a piston rod, a piston, an adjusting gasket, a compression nut, an upper excitation core, Lower excitation core, control line, controller, signal line, vehicle height sensor, magnetic isolation base plate, lower support. The position connection relationship between them is: the excitation coil and the excitation core as the electromagnetic field loading source are arranged in the working cylinder, the magnetorheological elastomer is located between the upper and lower excitation cores; the vehicle height sensor transmits the vibration signal of the vehicle body to Controller; the controller can change the current in the excitation coil through the control line, resulting in changes in the strength of the magnetic field in the excitation coil and the excitation core, thereby adjusting the stiffness and damping of the magnetorheological elastomer in real time; the coil spring can assist in reducing the The vibration device absorbs and reduces vibration energy. Through the joint action of the coil spring with fixed stiffness and damping and the magnetorheological elastomer with adjustable stiffness and damping, a set of semi-active magnetorheological elastomer vehicle seat damping device is formed, thereby improving the driving comfort of the vehicle .

The upper excitation coil and the upper and lower excitation coils are self-made components wound by enamelled copper wires, and their function is to act as a current loading source in the electromagnetic field and to adjust the intensity of the electromagnetic field.

The upper excitation core and the lower excitation core are self-made parts, made of alloy steel or other materials with high strength and high magnetic permeability, and their function is to act as a loading source for the electromagnetic field.

The magnetorheological elastomer is a solid cylinder, which is a self-made part. It is made by adding carbonyl iron powder with a micron-sized diameter to the silicone rubber matrix. The magnetorheological elastomer prepared in this way is relatively soft, and its stiffness and damping can be improved. High tonality, its function is the vibration reduction and shock absorption of the vehicle seat.

The working cylinder is a circular cylindrical part, which is a self-made part, with a connection hole on it, made of non-magnetic aluminum alloy material, and its function is to block the magnetic field and provide a working space for the piston.

The coil spring is a commercially available standard part, and its specific specifications are determined according to the size of the work cylinder and the piston rod. Its function is the support of the piston and the vibration reduction and vibration absorption of the vehicle seat.

The protective cover is a self-made part, which is an ordinary steel casting, and its function is to prevent dust and protect the work cylinder.

The upper support is a self-made part made of ordinary steel. The specific size depends on the size of the protective cover, piston rod and vehicle installation. Its function is to connect the vibration damping device and the vehicle seat.

The lower support is a self-made part and adopts ordinary steel material, and its specific size is determined according to the size of the work cylinder 2 and the vehicle installation, and its function is to connect the damping device and the vehicle seat.

The controller is a commercially available part, the model is a 32-bit STM32F205RF microprocessor, the on-chip RAM is 128KB, and the on-chip ROM is 512KB. Signal processing and control can be realized through programming.

The vehicle height sensor is a commercially available item, the model is Hongchuang RQH-10030, which is installed between the vehicle body and the axle, and its function is to measure the frequency and magnitude of the relative height change between the vehicle body and the axle.

The magnetic isolation bottom plate is a self-made part, made of non-magnetic aluminum alloy material, the specific size is determined according to the size of the working cylinder and the lower excitation core, and its function is to block the magnetic field at the bottom.

3. The invention "a semi-active magnetorheological elastomer vehicle seat damping device" has the following advantages:

(1). The damping device designed in the present invention works under the extrusion mode of the magneto-rheological elastomer, has a large adjustable range, and has good vibration-absorbing and damping performance.

(2). The structure is simple, the energy consumption is low, the response speed is fast, continuous control can be realized, and the vibration reduction requirements of the uneven road surface of the vehicle seat can be met.

(3). Convenient processing and assembly, low sealing requirements, stable performance and low maintenance cost.

In short, the device can realize the real-time adjustment of the stiffness and damping of the vehicle seat damping device, reduce the impact of bad roads on the ride comfort of the vehicle, improve the experience of the vehicle drivers and passengers, and improve the ride comfort and safety of the vehicle.

Description of drawings

The accompanying drawing is a schematic cross-sectional structure diagram of a semi-active magneto-rheological elastomer vehicle seat damping device of the present invention.

The symbols in the figure are explained as follows: 1-lower excitation coil, 2-working cylinder, 3-magnetorheological elastomer, 4-upper excitation coil, 5-helical spring, 6-protective cover, 7-sealing ring, 8-upper branch Seat, 9-piston rod, 10-piston, 11-adjusting gasket, 12-compression nut, 13-upper excitation core, 14-lower excitation core, 15-control line, 16-controller, 17-signal line, 18-vehicle height sensor, 19-magnetic isolation floor, 20-lower support.

Detailed ways

Below in conjunction with accompanying drawing, the embodiment of the present invention is described in further detail:

As shown in the accompanying drawings, a magnetorheological elastomer semi-active vehicle seat vibration damping device of the present invention includes the following components: a lower excitation coil 1, a working cylinder 2, a magnetorheological elastomer 3, an upper excitation coil 4, Coil spring 5, protective cover 6, sealing ring 7, upper support 8, piston rod 9, piston 10, adjusting gasket 11, compression nut 12, upper excitation core 13, lower excitation core 14, control line 15, Controller 16, signal line 17, vehicle height sensor 18, magnetic isolation base plate 19 and lower support 20. The position connection relationship between them is: the upper support 8 and the protective cover 6 are welded together; the sealing ring 7 is used for the sealing of the piston rod 9; connected together and placed in the mandrel 2; the piston rod 9 is fixedly connected with the upper support 8; the piston 10 is in contact with the coil spring 5; the coil spring 5 is in contact with the upper excitation core 13; the upper excitation coil 4 and the lower excitation coil 1 respectively wound on the upper excitation core 13 and the lower excitation core 14; the magnetorheological elastomer 3 is placed between the upper excitation core 13 and the lower excitation core 14; the magnetic isolation bottom plate 19 is in contact with the lower excitation core 14 The lower support 20 is installed on the bottom of the working cylinder 2; the controller 16 is connected with the lower excitation coil 1 and the upper excitation coil 4 through the control line 15; the vehicle height sensor 18 is connected with the controller 16 through the signal line 17.

The lower excitation coil 1 and the upper excitation coil 4 are self-made parts, which are wound by enamelled copper wires;

The working cylinder 2 is a circular cylindrical part made of non-magnetic aluminum alloy;

The magnetorheological elastomer 3 is a self-made part, which is made by adding micron-sized diameter carbonyl iron powder to the silicone rubber matrix. The magnetorheological elastomer prepared in this way is relatively soft, and has high stiffness and damping adjustability;

Described helical spring 5 is a commercially available standard part, and specific specifications are determined according to the size of working cylinder 2 and piston rod 9;

The protective cover 6 is a self-made part, which is an ordinary steel casting;

Described sealing ring 7 is a commercially available item, and specific specifications are determined according to the size of working cylinder 2 and piston rod 9;

The upper support 8 is a self-made part, made of ordinary steel, and the specific size is determined according to the protective cover 6 and the piston rod 9;

The piston rod 9 is a self-made part, which is an ordinary steel machined part;

The piston 10 is a self-made part, which is an ordinary steel machined part;

The adjusting gasket 11 is a commercially available standard part, and the specific specifications are determined according to the size of the piston rod 9;

Described compression nut 12 is a commercially available standard part, and specific specifications are determined according to the size of piston rod 9;

The upper excitation core 13 and the lower excitation core 14 are self-made parts, and the materials are made of alloy steel or other high strength and magnetic permeability materials;

The control line 15 is a commercially available item, which is a common copper core wire;

Described controller 16 is a commercial part, and model is 32 STM32F205RF microprocessors, and on-chip RAM is 128KB, and on-chip ROM is 512KB, can realize signal processing and control by programming;

Described signal wire 17 is a commercial part, is common copper core wire, decides according to the model of vehicle height sensor 18;

The vehicle height sensor 18 is a commercial item, and the model is Hongchuang RQH-10030;

The magnetic isolation bottom plate 19 is a self-made part, made of a non-magnetic aluminum alloy material, and the specific size is determined according to the size of the working cylinder 2 and the lower excitation core 14;

Described lower bearing 20 is a self-made part, adopts common steel material, and specific size is determined according to the size that working cylinder 2 and vehicle are installed;

As shown in the accompanying drawings, the vehicle seat damping device of the present invention is installed on the bottom of the vehicle seat to isolate and reduce the impact of vehicle body vibration on the vehicle driver and passengers, and improve the comfort and safety of the vehicle ride. During the working process, the vibration energy is mainly absorbed by the magnetorheological elastomer 3 and the coil spring 5, which play the role of vibration absorption and damping. The stiffness and damping of the coil coil spring 5 are fixed, while the magnetorheological elastomer The stiffness and damping of 3 can be controlled and adjusted in real time; after the upper excitation coil 4 and the lower excitation coil 1 are energized, a magnetic field is formed inside the working cylinder, and the strength of the internal magnetic field can be changed by changing the magnitude of the current; The vehicle height sensor 18 between the vehicle axles can measure the frequency and magnitude of the relative height change between the vehicle body and the vehicle axle, thereby judging the road conditions of the vehicle, and transmitting it to the controller 16 through the signal line 17, according to the preset control strategy The upper excitation coil 4 and the lower excitation coil 1 send control signals, specifically as follows: when the vehicle height sensor 18 detects low-frequency, large-amplitude vibrations of the vehicle body, the controller 16 sends current signals to the upper excitation coil 4 and the lower excitation coil 1. control, the magnetic field inside the working cylinder 2 is strengthened, the stiffness and damping of the magnetorheological elastomer 3 are increased, and the entire seat damping suspension is in a high stiffness and large damping damping state; when the vehicle height sensor 18 detects that the vehicle body When high-frequency, small-amplitude vibrations occur, the controller 16 sends current signals to the upper excitation coil 4 and the lower excitation magnetic coil 1 and controls them in real time, so that the magnetic field inside the working cylinder 2 is weakened or disappeared, and the stiffness and damping of the magnetorheological elastomer 3 Decrease, the vehicle seat shock absorber is in a state of low stiffness and small damping.

The present invention has been described according to the envisioned implementation of specific examples, but is not limited to the above-mentioned examples. All technical solutions that conform to the thinking of the present invention and are obtained by using similar structures and material replacement methods all fall within the scope of protection of the present invention.

Claims (1)

1. A semi-active magnetorheological elastomer vehicle seat damping device, characterized in that: the device comprises a lower excitation coil, a working cylinder, a magnetorheological elastomer, an upper excitation coil, a helical spring, a protective cover, a sealing Ring, upper support, piston rod, piston, adjusting gasket, compression nut, upper excitation core, lower excitation core, control line, controller, signal line, vehicle height sensor, magnetic isolation base plate, lower support. The excitation coil and the excitation core as the electromagnetic field loading source are arranged in the work cylinder, the magnetorheological elastomer is located between the upper and lower excitation cores; the coil spring is arranged between the piston and the upper excitation core, which can support the piston and at the same time The auxiliary damping device absorbs and reduces vibration energy; the vehicle height sensor transmits the vibration signal of the vehicle body to the controller; the controller can change the strength of the electromagnetic field inside the working cylinder through the control line, and then realize the real-time adjustment of the stiffness and damping of the magnetorheological elastomer Adjustment to meet the vibration reduction requirements of the seat system for multiple road conditions during vehicle driving, and improve the driving comfort of the vehicle. The upper excitation coil and the upper and lower excitation coils are wound by enamelled copper wires, which are self-made parts, and their function is as a current loading source in the electromagnetic field and to adjust the intensity of the electromagnetic field; The upper excitation core and the lower excitation core are self-made parts, which are made of alloy steel or other materials with high strength and magnetic permeability, and their function is as a loading source of electromagnetic field; The magnetorheological elastomer is a solid cylinder, which is a self-made part. It is made by adding carbonyl iron powder with a micron-sized diameter to the silicone rubber matrix. The magnetorheological elastomer prepared in this way is relatively soft, and its stiffness and damping can be improved. High tonality, its function is the vibration reduction and vibration absorption of the vehicle seat; The working cylinder is a circular cylindrical part, which is a self-made part, and there is a connection hole on it, which is made of non-magnetic aluminum alloy material, and its function is to block the magnetic field and provide a working space for the piston; The coil spring is a commercially available standard part, and its specific specifications are determined according to the size of the working cylinder and the piston rod, and its function is the support of the piston and the vibration reduction and vibration absorption of the vehicle seat; The protective cover is a self-made part, which is an ordinary steel casting, and its function is to prevent dust and protect the work cylinder; The upper support is a self-made part, made of ordinary steel, and its specific size depends on the size of the protective cover, piston rod and vehicle installation, and its function is to connect the vibration damping device and the vehicle seat; The lower support is a self-made part, which is made of ordinary steel, and its specific size is determined according to the size of the work cylinder 2 and the vehicle installation, and its function is to connect the vibration damping device and the vehicle seat; The controller is a commercially available part, the model is a 32-bit STM32F205RF microprocessor, the on-chip RAM is 128KB, and the on-chip ROM is 512KB, and signal processing and control can be realized through programming; The vehicle height sensor is a commercially available part, the model is Hongchuang RQH-10030, which is installed between the vehicle body and the axle of the vehicle, and its function is to measure the frequency and magnitude of the relative height change between the vehicle body and the axle; The magnetic isolation bottom plate is a self-made part, made of non-magnetic aluminum alloy material, the specific size is determined according to the size of the working cylinder and the lower excitation core, and its function is to block the magnetic field at the bottom.