CN104455178A - Damping-adjustable magneto-rheological lag damper - Google Patents

Abstract

The invention relates to a magneto-rheological damper with adjustable damping, which includes a cylinder, a piston rod, a piston assembly and a damping adjustment mechanism. The outer edge of the left end of the cylinder is radially and symmetrically formed with a short shaft. The right end of the cylinder is coaxially sealed with an end cover, and a piston rod is installed coaxially in the cylinder, both ends of the piston rod are located outside the cylinder, and the piston rod on the left side of the cylinder is installed coaxially A piston assembly, corresponding to the piston rod on the right side of the cylinder of the piston assembly, a damping adjustment mechanism is coaxially slid on the piston rod. The left end of the piston rod is coaxially threaded to the joint bearing at the rod end. The shimmy reducer has excellent characteristics such as simple structure, low energy consumption, small size, fast response, continuous forward and reverse adjustable damping force in a large range, good temperature stability, and easy combination with computer to realize intelligent control. The prospects are broad.

Description

A Damping Adjustable Magneto-rheological Shock Absorber

technical field

The invention belongs to the technical field of mechanical vibration control, and relates to a magneto-rheological damper with adjustable damping.

Background technique

When the aircraft is taking off or landing, the front wheel of the landing gear will produce a severe shimmy in the lateral and torsional directions that deviates from the neutral position of the wheel and couples with each other. Any wheel that can be steered may have shimmy phenomenon, such as the front wheel of a car and a trolley with steering wheels often appear shimmy phenomenon when moving.

The cause of aircraft front wheel shimmy is: a very complex self-excited vibration caused by the mutual coupling between the lateral vibration of the pillar and the front wheel and the torsional vibration of the front wheel around the axis of the pillar. The energy to maintain this self-excited vibration It is provided by the force and moment that the ground acts on the tire during the aircraft's taxiing process.

The effective measures taken against the shimmy phenomenon of the front wheel of the aircraft are mostly passive control methods at present, and the commonly used hydraulic shim absorbers are piston type and vane type. When the front wheel shimmy occurs, the anti-twist arm on the front landing gear strut will drive the piston to reciprocate in the shock absorber housing, forcing the fluid in the cavity with reduced volume to enter the cavity with increased volume through the piston orifice. When the fluid flows back and forth through the orifice, a force will be generated, which will generate a damping moment on the axis of the front landing gear strut, thereby suppressing the shimmy vibration, and converting the mechanical energy generated by the shimmy vibration into thermal energy for dissipation, thus playing a role to the role of swing reduction. For larger shimmy vibrations, the shimmy vibration control must be realized by reducing the orifice and increasing the piston, which increases the volume of the shimmy absorber and increases the mass of the aircraft. At the same time, the passively controlled shimmy It is not sensitive to disturbance, which is very unfavorable for reducing aircraft shimmy.

After searching, a patent document related to the content of this patent was found, the Chinese patent with the publication number CN1994819, which provides a helicopter hub magneto-rheological damper, which belongs to the helicopter hub damper. The shock absorber includes a magneto-rheological fluid (9), an electromagnet (1), an armature (3), an excitation coil (6) for generating a magnetic field, a rotating shaft (4), a reciprocating rotary piston (5), a semicircular Reservoir (8). The magnetorheological fluid is injected into the inner cavity of the liquid reservoir, the reciprocating rotary piston is connected with the rotary shaft and reciprocates and rotates together, and the magnetorheological fluid reciprocates in the magnetorheological fluid return channel along with the reciprocating rotary piston. By changing the magnitude of the input current, the output damping torque of the hub damper is changed.

By comparison, the application scope of the above-mentioned patent publications is different from that of the present invention. The present invention is applied to aircraft landing gear and other steerable wheels, and the above-mentioned patent publications are applied to helicopter rotor hubs; in addition, the working modes of the two are different. The working mode of the shock absorber of the present invention is the differential pressure flow mode, and the working mode of the shock absorber described in the above-mentioned patent publications is the shearing mode.

Contents of the invention

The purpose of the invention is to remedy the defects in the prior art and provide a magneto-rheological shimmy damper with better damping characteristics and adjustable damping, so as to prevent and eliminate the shimmy phenomenon of the front wheel when the aircraft is taxiing.

The purpose of the present invention is achieved like this:

A damping adjustable magneto-rheological shock absorber, including a cylinder, a piston rod, a piston assembly and a damping adjustment mechanism, the outer edge of the left end of the cylinder is radially and symmetrically formed with a short shaft, and the right end of the cylinder The coaxial seal is equipped with an end cover, and a piston rod is coaxially installed in the cylinder, and both ends of the piston rod are located outside the cylinder, and a piston assembly is coaxially installed on the left piston rod in the cylinder Corresponding to the coaxial sliding installation of the damping adjustment mechanism on the piston rod on the right side of the cylinder of the piston assembly, the damping adjustment mechanism rotates around the axis for a certain angle and is installed together with the piston assembly. It is located at the left end of the piston rod outside the cylinder The external coaxial threaded rod end joint bearing.

Moreover, the piston rod has a stepped shaft structure, the left end is formed with a thread connected with the rod-end joint bearing, the right part is axially formed with a central hole, and the right end of the piston rod is radially symmetrically formed with a fixed damping adjustment mechanism. The installation hole is located at the inside of the piston rod of the installation hole, and two positioning holes are radially formed on the same circumference. The angle between the central axes of the two positioning holes is a certain angle. Two connecting holes communicated with the piston assembly, the connecting holes and the positioning holes are both communicated with the central hole.

Moreover, the included angle between the central axes of the positioning holes is 30 degrees.

Moreover, the piston assembly has a left-right symmetrical structure, including a pair of helical-groove magnetic-conductive collars, a pair of magnetic-conductive collars, a wire-wound magnetic-conductive ring, and a porous guide ring, and the wire-wound magnetic-conductive ring Coaxial and fixed on the piston rod, the outer edge of the winding magnetic ring is radially symmetrical with two annular grooves on the left and right, and coils are wound in opposite directions in the two annular grooves, and the bottom of the two annular grooves A magnetically conductive ring hole corresponding to the connecting hole of the piston rod is radially formed, and the outer edges of the left and right ends of the winding magnetically conductive ring are coaxially and symmetrically fixed with a spiral groove magnetically conductive collar, The outer edge of the spiral groove magnetic collar forms a gap with the inner wall of the cylinder, the left end of the spiral groove magnetic collar is clamped on the stepped shaft end of the piston rod, and the right end of the spiral groove magnetic collar passes through The nut is locked with the piston rod; a pair of magnetic collars are coaxially set on the outer edge of the coiled magnetic collar between the spiral groove magnetic collars, and the opposite ends of the two magnetic collars are A porous guide ring is coaxially installed in the prepared groove; the outer edge of the porous guide ring is in frictional contact with the inner wall of the cylinder, and the inner side of the outer edge of the porous guide ring is axially evenly distributed with multiple Large damping holes, the porous guide ring between two adjacent large damping holes is axially uniformly equipped with small damping holes, the large and small damping holes are located on the same circumference, and the diameter of the large damping hole is equal to the diameter of the small damping hole double;

The gap between the inner wall of the cylinder and the outer edge of the symmetrical spiral groove magnetic collar forms an annular damping channel, and the damping hole is connected in series with the annular damping channels on both sides to form a damping channel coaxial with the piston rod.

Moreover, the number of the large damping holes is six.

Moreover, the coil is in two-stage parallel connection, and is wound in parallel on opposite sides, and the outside of the coil is coated with a certain thickness of epoxy resin.

Moreover, a T-shaped magnetic isolation ring is installed between the spiral groove magnetic conduction collar and the magnetic conduction collar.

Moreover, a spiral groove is formed on the outer edge of the spiral groove magnetically conductive collar, the depth of the spiral groove is 0.5mm, and the pitch is 1mm.

Moreover, the damping adjustment mechanism includes an adjuster sleeve and an adjusting thimble, the adjuster sleeve and the piston rod are coaxially slid and fitted together, and the left end of the adjuster sleeve is integrally formed with an annular end plate with a circumference A plurality of adjusting thimbles corresponding to large damping holes or small damping holes are uniformly installed, and the ends of the adjusting thimbles face the direction of the porous guide ring, and the diameter of the adjusting thimbles is equal to the diameter of the small damping holes.

Moreover, O-rings are installed between the cylinder and the piston rod, between the regulator sleeve and the piston rod, and between the end cover and the cylinder and the piston rod.

Advantage and positive effect of the present invention are:

1. The damping force of the shimmy reducer has multiple adjustment methods. One is to change the number and size of the damping holes of the porous guide ring through the damping adjustment mechanism to realize the adjustment of the initial damping; the other is to change the gap of the damping channel by adjusting the input current The shear yield strength of the magnetorheological fluid at the center can be adjusted to realize the adjustment of the damping force of the shimmy absorber; the third is that when there is no external magnetic field or the external magnetic field is weak, the spiral groove of the spiral groove magnetic collar can give full play to the magnetorheological fluid. Excellent flow performance, reduce viscous force, reduce sedimentation and deposition of magnetorheological fluid, and prevent air bubbles. The damping channel in the present invention is composed of a symmetrical annular damping channel connected in series with a small damping hole (or a large damping hole), and the structure design of the small damping hole (or a large damping hole) ensures that no magnetic field passes through, and the annular damping at both ends The channel adjusts the viscosity of the magnetorheological fluid flowing through it by applying an external magnetic field.

2. The present invention can not only ensure the minimum damping under the zero magnetic field condition, but also increase the adjustment range of the damping force of the pendulum reducer. The coil adopts two-level parallel connection, and the parallel winding method on different sides effectively reduces the response time of the shock absorber, increases the response speed and the controllability of the damping force, and improves the working efficiency of the shock absorber. The magnetic collar changes the flow mode of the magnetic flux, so that the effective working length of the damping channel can basically cover the entire piston, making full use of the effective damping channel. Because of its good shock absorption and controllability, it can effectively prevent and eliminate the shimmy phenomenon of the nose landing gear of the aircraft.

3. The magneto-rheological shimmy damper is a semi-active shimmy control device with simple structure, low energy consumption, small size, fast response, continuously adjustable damping force in a wide range, good temperature stability It can overcome the shortcomings of the traditional passive damper, such as difficult to measure the state feedback, large energy consumption of active control force, time lag and overflow, etc., and is suitable for the actuation of structural shimmy control. device. Because of its good control effect, magnetorheological damper has great advantages in shimmy control, and its application prospect is very wide.

Description of drawings

Fig. 1 is a top sectional view of the present invention;

Fig. 2 is a front sectional view of the present invention;

Fig. 3 is an enlarged view of part I in Fig. 1;

Fig. 4 is the A-A direction sectional view of Fig. 2;

Fig. 5 is a structural schematic diagram of the adjustment rod needle of the damping adjustment mechanism inserted into the damping hole in the present invention;

Fig. 6 is a schematic diagram of the three-dimensional structure of the present invention.

Explanation of reference signs:

1-Rod end joint bearing, 2-Piston rod, 3-Cylinder, 4-Piston assembly, 5-Adjusting thimble, 6-Adjuster sleeve, 7-Pressure ring, 8-Retaining ring, 9-O-ring , 10-end cover, 11-positioning hole, 12-center hole, 13-installation hole, 14-short shaft, 15A-magnetic ring hole, 15B-connecting hole, 16-pin, 17-T type magnetic isolation ring, 18-Porous guide ring, 19-Magnetic collar, 20-Coil, 21-Spiral groove magnetic collar, 22-Wound magnetic collar, 23-Nut, 24-Epoxy resin, 25-Large damping Holes, 26-small damping holes.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are illustrative, not restrictive, and the protection scope of the present invention cannot be limited by the following embodiments.

A damping adjustable magnetorheological damper, as shown in Figure 1 and Figure 2, includes a cylinder 3, a piston rod 2, a piston assembly 4 and a damping adjustment mechanism, and the left end of the cylinder is radially and symmetrically formed with Two short shafts 14 for connecting with the aircraft, the right end of the cylinder is coaxially sealed with an end cover 10, and a piston rod is coaxially worn in the cylinder, and both ends of the piston rod are located in the cylinder. Outside the cylinder, a piston assembly is coaxially installed on the piston rod in the left side of the cylinder, and a damping adjustment mechanism is coaxially slid on the piston rod in the right side of the cylinder corresponding to the piston assembly. The left end of the piston rod Coaxial threaded joint rod end joint bearing 1. In the process of assembling the shock absorber, for the sake of convenience, the damping adjustment mechanism is connected with the piston rod through the pin 16 .

In this embodiment, the piston rod has a stepped shaft structure, the left end is formed with a thread connected with the rod end joint bearing, the right part is axially formed with a central hole 12, and the right end of the piston rod is radially symmetrically formed with a fixed The mounting hole 13 of the damping adjustment mechanism is radially formed with two positioning holes 11 on the inner side of the piston rod of the mounting hole. There are two connecting holes 15B communicating with the piston assembly, and the connecting holes and the positioning holes are both communicating with the central hole.

The piston assembly is a left-right symmetrical structure, as shown in Figure 3, including a pair of spiral groove magnetic conduction collars 21, a pair of magnetic conduction collars 19, a winding magnetic conduction ring 22 and a porous guide ring 18 , the wire-wound magnetic conduction ring is coaxially fixed on the piston rod, and the outer edge of the wire-wound magnetic conduction ring is radially symmetrical with two annular grooves (not marked in the figure), and the two annular grooves Coils 20 are respectively wound in opposite directions. The two sets of coils are two-stage parallel, and adopt parallel winding on opposite sides. The two sets of coils can work simultaneously or independently. The outside of the coil is coated with a certain thickness of Oxygen resin 24 is to play a sealing effect, and the magnetic conduction ring hole 15A (as shown in Figure 2 ) corresponding to the connection hole of the piston rod is all radially shaped on the bottom of the two annular grooves, and the magnetic conduction ring of the winding is The outer edges of the left and right ends are coaxially and symmetrically equipped with a spiral groove magnetic collar, the outer edge of the spiral groove magnetic collar forms a gap with the inner wall of the cylinder, and the left end of the spiral groove magnetic collar The part is clamped on the stepped shaft end of the piston rod, and the right end of the spiral groove magnetic conduction collar is locked by a nut 23; the outer edge of the winding magnetic conduction ring between the spiral groove magnetic conduction collar is coaxial Set a pair of magnetic collars. In order to prevent the magnetic flux from forming a loop through the magnetic collars and causing magnetic flux leakage, a T-shaped magnetic isolation ring 17 is installed between the spiral groove magnetic collars and the magnetic collars. The two A porous guide ring is coaxially installed in the groove formed between the opposite ends of the magnetic collar; the outer edge of the porous guide ring is in frictional contact with the inner wall of the cylinder, and the outer edge of the porous guide ring A plurality of large damping holes 25 are evenly distributed in the side axial direction, and as shown in Figure 4, the porous guide ring between two adjacent large damping holes is axially uniformly shaped with small damping holes 26 (small damping holes are also uniformly distributed in the axial direction). is six), the large and small damping holes are located on the same circumference, that is, the angle between the axes of the adjacent large and small damping holes is α is 30 degrees, and the diameter of the large damping hole is twice the diameter of the small damping hole.

The gap between the inner wall of the cylinder and the outer edge of the symmetrical spiral groove magnetic collar forms an annular damping channel, and the damping hole is connected in series with the annular damping channels on both sides to form a damping channel coaxial with the piston rod.

The outer edge of the spiral groove magnetic collar is formed with a spiral groove, the depth of the spiral groove is 0.5 mm, and the pitch is 1 mm. The gap B between the maximum outer diameter of the spiral groove magnetic collar and the inner wall of the cylinder is 2 mm. The role of the spiral groove is to give full play to the flow characteristics of the magnetorheological fluid, reduce the viscous force, reduce the sedimentation and deposition of the magnetorheological fluid, and prevent the generation of air bubbles.

The structure of the damping adjustment mechanism is shown in Figure 1 and Figure 2, including an adjuster sleeve 6 and an adjusting thimble 5, the adjuster sleeve and the piston rod are coaxially slid together, the left end of the adjuster sleeve The ring-shaped end plate made of the part is equipped with six adjusting thimbles evenly distributed radially around the circumference, and the ends of the adjusting thimbles face the direction of the porous guide ring. The diameter of the adjusting thimbles is equal to the diameter of the small damping hole. During the debugging process, move the damping adjustment mechanism, and when the six adjusting needle rods are fully inserted into the large damping hole, the cross-sectional area of the large damping hole is the same as that of the small damping hole, that is, the size of the damping hole is changed; when the damping adjustment mechanism rotates 30 degrees , when the adjusting needle rod is fully inserted into the small damping hole, the small damping hole is completely blocked, and only the large damping hole can pass through the magnetorheological fluid, that is, the number of damping holes is reduced.

In order to prevent the adjusting thimble from loosening, a pressure ring 7 is fixed coaxially on the right side of the annular end plate of the regulator sleeve, and a circlip 8 is installed on the outside of the pressure ring.

In order to improve the sealing performance of the shock absorber, O-rings 9 are installed between the cylinder and the piston rod, between the regulator sleeve and the piston rod, and between the end cap and the cylinder and the piston rod.

The number of large (or small) damping holes in the present invention is determined by the initial damping force and flow rate, and the number in this embodiment is 6.

The damping channel in the present invention is composed of a symmetrical annular damping channel connected in series with a small damping hole (or a large damping hole), and the structure design of the small damping hole (or a large damping hole) ensures that no magnetic field passes through, and the annular damping at both ends The channel adjusts the viscosity of the magnetorheological fluid flowing through it by applying an external magnetic field.

The using method of the present invention is:

According to different models, first test the damping of the front wheel of the aircraft, and then adjust the initial damping force when the shock absorber is working. The specific method is:

Rotate the damping adjustment mechanism 30 degrees relative to the piston assembly, insert the adjusting thimble into the large (or small) damping hole, and insert the pin into the positioning hole of the piston rod to lock the damping adjustment mechanism. By inserting the thimble into different large and small damping holes, the damping force effect is also different. After the adjustment, the damping adjustment mechanism is fixed on the piston rod with a pin, and then it can be installed on the parts of the front wheel column of the aircraft.

The working principle of the present invention is set forth as follows:

When current is applied to the two sets of coils, the total magnetic flux generated by the energized coils will be divided when it flows through the two ends of the piston assembly. A part of the magnetic flux will flow directly to the cylinder wall through the damping channel at the edge of the piston assembly, and the other part will flow to the guide first. The magnetic collar, and then flows to the cylinder wall through the magnetic collar. According to the above-mentioned magnetic flux flow mode, both ends of the piston assembly of the shimmy absorber and the damping channel above the magnetic collar have an effective working length, so that the effective working length of the damping channel basically covers the entire length of the piston, making full use of the effective damping channel.

Before using the shim absorber, when the aircraft is running during take-off or landing, the nose wheel of the aircraft will produce a severe shimmy that deviates from the neutral position of the wheel and couples with each other in the lateral and torsional directions. The force generated by shimmy pushes the piston rod of the shock absorber to move back and forth, and the displacement change of the piston rod drives the flow of magnetorheological fluid in the cylinder, and the magnetorheological fluid at both ends of the piston flows back and forth through the damping holes of the porous guide ring. When the magnetorheological fluid flows through the spiral groove magnetic collar, the porous guide ring and the magnetic collar, a large viscous force will be generated, and the adjusting needle bar can be inserted into the hole of the porous guide ring by moving the damping adjustment mechanism. The method of damping holes is used to adjust the size and quantity of damping holes, and then adjust the initial damping force when the pendulum reduction mechanism is working. According to the size of the inserted damping hole, the damping force effect is also different.

The beneficial effects of the present invention are:

The damping force of the pendulum absorber has multiple adjustment methods. One is to change the number and size of the damping holes of the porous guide ring through the damping adjustment mechanism to realize the adjustment of the initial damping; the other is to change the magnetic field at the gap of the damping channel by adjusting the input current. The shear yield strength of the rheological fluid realizes the adjustment of the damping force of the shimmy absorber; the third is that when there is no external magnetic field or the external magnetic field is weak, the spiral groove of the magnetic collar with spiral grooves can give full play to the flow of the magnetorheological fluid Performance, reduce viscosity, reduce sedimentation and deposition of magnetorheological fluid, and prevent air bubbles. The damping channel in the present invention is composed of a symmetrical annular damping channel connected in series with a small damping hole (or a large damping hole), and the structure design of the small damping hole (or a large damping hole) ensures that no magnetic field passes through, and the annular damping at both ends The channel adjusts the viscosity of the magnetorheological fluid flowing through it by applying an external magnetic field.

The invention can not only ensure the minimum damping under the zero magnetic field condition, but also increase the adjustment range of the damping force of the pendulum reducer. The coil adopts two-level parallel connection, and the parallel winding method on different sides effectively reduces the response time of the shock absorber, increases the response speed and the controllability of the damping force, and improves the working efficiency of the shock absorber. The magnetic collar changes the flow mode of the magnetic flux, so that the effective working length of the damping channel can basically cover the entire piston, making full use of the effective damping channel. Because of its good shock absorption and controllability, it can effectively prevent and eliminate the shimmy phenomenon of the nose landing gear of the aircraft.

It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive, so the present invention includes and is not limited to the embodiments described in the specific implementation, and those skilled in the art according to the technology of the present invention Other implementations derived from the scheme also belong to the protection scope of the present invention.

Claims (10)

1. a damp adjustable magnetorheological shimmy damper, it is characterized in that: comprise cylinder barrel, piston rod, piston assembly and damper regulation mechanism, the left part outer rim radial integrated symmetry of described cylinder barrel is shaped with minor axis, the right part co-axial seal of this cylinder barrel is provided with end cap, a piston rod is coaxially installed in described cylinder barrel, the two end part of this piston rod are all positioned at cylinder barrel outside, in described cylinder barrel, the piston rod in left side coaxially installs a piston assembly, to should in the cylinder barrel of piston assembly right side piston rod on to be coaxially slidably installed damper regulation mechanism, be installed togather with piston assembly after this damper regulation mechanism rotates to an angle around axle center, the piston rod left part coaxial threaded being positioned at cylinder barrel outside connects spherical plain bearing rod end.

2. damp adjustable magnetorheological shimmy damper according to claim 1, it is characterized in that: described piston rod is multidiameter shaft structure, left end is shaped with the screw thread be connected with described spherical plain bearing rod end, right part is axially shaped with center hole, the right part radial symmetric of this piston rod is shaped with the mounting hole of fixing damper regulation mechanism, the inboard same circumference radial direction of piston rod being positioned at this mounting hole is shaped with two positioning holes, the central axis angle of these two positioning holes is certain angle, the inner end portion spaced radial of this piston rod is shaped with two attachment holes be communicated with described piston assembly, this attachment hole and positioning hole are all communicated with center hole.

3. damp adjustable magnetorheological shimmy damper according to claim 2, is characterized in that: the central axis angle of described positioning hole is 30 degree.

4. the damp adjustable magnetorheological shimmy damper according to Claims 2 or 3, it is characterized in that: described piston assembly is for left, right symmetrical structure, comprise a pair helical groove magnetic conduction collar, a pair magnetic conduction collar, coiling magnetic guiding loop and porous type guide ring, described coiling magnetic guiding loop is coaxially fixedly mounted with on the piston rod, this coiling magnetic guiding loop outer rim is left, right radial symmetric is shaped with two annular grooves, in two annular grooves, reverse-winding has coil respectively, bottom two annular grooves, equal radial direction is shaped with the magnetic conduction annular distance corresponding with the attachment hole of described piston rod, described coiling magnetic guiding loop is left, the outer rim coaxial-symmetrical at right two end part is fixed with the helical groove magnetic conduction collar, this helical groove magnetic conduction collar outer rim and inner wall of cylinder form gap, the left part of this helical groove magnetic conduction collar is installed on the ladder axle head of piston rod, the right part of this helical groove magnetic conduction collar is locked by nut and piston rod, coiling magnetic guiding loop outer rim coaxial package a pair magnetic conduction collar between the described helical groove magnetic conduction collar is relative, coaxial installation one porous type guide ring in the groove be shaped with between the opposed end of these two magnetic conduction collars, described porous type guide ring outer rim and described inner wall of cylinder rubbing contact, the inboard axis of this porous type guide ring outer rim is uniform is shaped with multiple large damping hole, porous type guide ring between adjacent two large damping holes is axially uniform is shaped with little damping hole, this large and small damping hole is positioned at same circumference, and the aperture of large damping hole is the twice in little damping hole aperture,

Slit-shaped between the helical groove magnetic conduction collar outer rim of described inner wall of cylinder and symmetry circularizes damp channel, and the annular damper Tandem of described damping hole and its both sides is formed and the homoaxial damp channel of piston rod.

5. damp adjustable magnetorheological shimmy damper according to claim 4, is characterized in that: the quantity of described large damping hole is six.

6. damp adjustable magnetorheological shimmy damper according to claim 4, is characterized in that: described coil is secondary parallel way, and adopts around to contrary heteropleural canoe in parallel, the certain thickness epoxy resin of external application of this coil.

7. damp adjustable magnetorheological shimmy damper according to claim 4, is characterized in that: install T-shaped magnetism resistent ring between the described helical groove magnetic conduction collar and the magnetic conduction collar.

8. damp adjustable magnetorheological shimmy damper according to claim 4, is characterized in that: the outer rim of the described helical groove magnetic conduction collar is shaped with spiral chute, this spiral fluted degree of depth 0.5mm, pitch 1mm.

9. damp adjustable magnetorheological shimmy damper according to claim 4, it is characterized in that: described damper regulation mechanism comprise governor sleeve and regulate thimble, described governor sleeve is fitted together with the coaxial flip sleeve of piston rod, the annular endplate circumference radial equipartition that the left part of this governor sleeve is integrally shaped with is fixedly mounted with multiple and large damping hole or adjustment thimble corresponding to little damping hole, the end of this adjustment thimble is towards porous type guide ring direction, and the diameter of this adjustment thimble is equal with the aperture of described little damping hole.

10. damp adjustable magnetorheological shimmy damper according to claim 4, is characterized in that: equal mounting O-shaped rings between described cylinder barrel and piston rod, between governor sleeve and piston rod, between end cap and cylinder barrel and piston rod.