CN104455178A - Damping-adjustable magneto-rheological lag damper - Google Patents
Damping-adjustable magneto-rheological lag damper Download PDFInfo
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- CN104455178A CN104455178A CN201410767028.8A CN201410767028A CN104455178A CN 104455178 A CN104455178 A CN 104455178A CN 201410767028 A CN201410767028 A CN 201410767028A CN 104455178 A CN104455178 A CN 104455178A
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- piston rod
- cylinder barrel
- shaped
- magnetic conduction
- damping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/19—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3221—Constructional features of piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3228—Constructional features of connections between pistons and piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/3405—Throttling passages in or on piston body, e.g. slots
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/362—Combination of sealing and guide arrangements for piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention relates to a damping-adjustable magneto-rheological lag damper. The damping-adjustable magneto-rheological lag damper comprises a cylinder barrel, a piston rod, a piston component and a damping adjusting mechanism. Stub shafts are integrally produced at the outer edge of the left end of the cylinder barrel symmetrically and radially, and an end cover is mounted at the right end of the cylinder barrel hermetically and coaxially. The piston rod is penetratingly mounted in the cylinder barrel coaxially, and two ends of the piston rod are positioned outside the cylinder barrel. The piston component is mounted at the position, on the inner left side of the cylinder barrel, of the piston rod coaxially. The damping adjusting mechanism is slidably mounted at the position, corresponding to the piston component and positioned on the inner right side of the cylinder barrel, of the piston rod coaxially and rotates around an axial center by a certain angle prior to being fittingly mounted together with the piston component, and the left end, positioned outside the cylinder barrel, of the piston rod is in coaxial threaded connection with a rod-end joint bearing. The damping-adjustable magneto-rheological lag damper has the advantages of simple structure, low energy consumption, small size, rapidity in response, continuous forward and reverse adjustability in damping force within a wide range, good temperature stability, easiness in combination with a computer to achieve intelligent control and the like, thereby being quite promising in application prospect.
Description
Technical field
The invention belongs to mechanical vibration control technical field, relate to a kind of damp adjustable magnetorheological shimmy damper.
Background technique
Aircraft is when taking off or alighting run, and it is acutely shimmy that undercarriage front-wheel can produce a kind of one intercoupled in side direction and torsional direction departing from wheel neutral position.All may there is shimmy phenomenon in every wheel that can handle, as the front-wheel of automobile and dolly that deflecting roller is housed also usually occur shimmy phenomenon when moving.
Producing the reason of front-wheel shimmy of airplane is: the lateral vibration by pillar, front-wheel and the front-wheel torsional vibration around pillar axes intercouple caused a kind of very complicated self-excited vibration, and the energy maintaining this self-excited vibration is provided by the power of ground effects on tire and moment in the sliding race process of aircraft.
For the effective measures that the shimmy phenomenon of aircraft nose wheel is taked, take the way of Passive Control at present, conventional liquid damper has piston type and blade type more.When front-wheel occurs shimmy, anti-torque arm on nose-gear pillar can drive piston to-and-fro motion in shimmy-damper housing, fluid in the cavity forcing volume to reduce enters in the cavity of volume increase by throttling piston hole, fluid is producing active force in throttle orifice back and forth flow process, this power can produce a damping torque to nose-gear pillar axes, suppress shimmy thus, and make the mechanical energy of shimmy generation become thermal dissipation, thus play the effect subtracting pendulum.For larger shimmy, shimmy control must be realized by the form reducing throttle orifice and increase piston, shimmy-damper volume is increased, Aircraft Quality is caused to increase, meanwhile, the shimmy-damper of Passive Control is insensitive to disturbing outside low frequency, and this is very disadvantageous for reducing aircraft shimmy.
Through retrieval, finds one section of patent documentation relevant to this patent content, publication number is the Chinese patent of CN1994819, and this patent provides a kind of helicopter hub magnetorheological shimmy damper, genus helicopter hub shimmy-damper.This shimmy-damper comprises field coil (6), running shaft (4), reciprocating rotary-piston (5), the semicircle liquid-storage container (8) in magnetic flow liquid (9), electromagnet (1), armature (3), generation magnetic field.Magnetic flow liquid is infused in the inner chamber of liquid-storage container, and make reciprocating rotary together with reciprocating rotary-piston is connected also with running shaft, magnetic flow liquid back and forth flows in magnetic flow liquid return flow line with reciprocating rotary-piston.By changing the size of input current, change the output damping torque of propeller hub shimmy-damper.
By contrast, above-mentioned patent publication us is different from application area of the present invention, and the present invention is applied to undercarriage and other wheels that can handle, and above-mentioned patent publication us is applied to lifting airscrew propeller hub; In addition, both mode of operations are different, and the mode of operation of shimmy-damper of the present invention is Differential pressure flow pattern, and described in above-mentioned patent publication us, the mode of operation of shimmy-damper is shear mode.
Summary of the invention
The object of invention is the defect being to make up in prior art, provides a kind of and has good damping characteristic, the magnetorheological shimmy damper of damping is adjustable mode, the shimmy phenomenon of front-wheel during to prevent and to eliminate that aircraft is sliding to be run.
The object of the present invention is achieved like this:
A kind of damp adjustable magnetorheological shimmy damper, 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.
And, 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, and this attachment hole and positioning hole are all communicated with center hole.
And the central axis angle of described positioning hole is 30 degree.
And, described piston assembly is 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.
And the quantity of described large damping hole is six.
And described coil is secondary parallel way, and adopt around to contrary heteropleural canoe in parallel, the certain thickness epoxy resin of external application of this coil.
And, between the described helical groove magnetic conduction collar and the magnetic conduction collar, T-shaped magnetism resistent ring is installed.
And 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.
And, 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.
And, 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.
Advantage of the present invention and good effect are:
1, this shimmy-damper damping force has multiple regulative mode, and one is change the damping hole quantity of porous type guide ring, size to realize the adjustment of initial damping by damper regulation mechanism; Two is the shear yield strengths by regulating input current to change damp channel gap location magnetic flow liquid, realizes the adjustment of shimmy-damper damping force; Three be without externally-applied magnetic field or externally-applied magnetic field more weak time, the spiral chute of the helical groove magnetic conduction collar can give full play to the mobile performance of magnetic flow liquid, reduces viscous force, reduces the sedimentation of magnetic flow liquid and alluvial, prevents bubble from producing.Damp channel in the present invention is in series by the annular damper passage of symmetry and little damping hole (or large damping hole), and guarantee do not have magnetic field to pass through during little damping hole (or large damping hole) structural design, and two ends annular damper passage regulates the viscosity flowing through magnetic flow liquid herein by externally-applied magnetic field.
2, the present invention can ensure the minimum damping under zero magnetic field condition, can increase again the regulation range of the damping force of shimmy-damper.Coil adopts the mode of secondary parallel connection, and the canoe of heteropleural parallel connection effectively reduces the response time of shimmy-damper, increases the controllability of speed of response and damping force, improves the working efficiency of shimmy-damper.The magnetic conduction collar changes magnetic flux flows mode, makes effective active length of damp channel substantially can cover whole piston, makes full use of effective damping passage.Because it has good damping property and controllability, can effectively prevent and eliminate the shimmy phenomenon of aircraft nose landing gear.
3, this magnetorheological shimmy damper is the shimmy control gear of a kind of half active, have that structure is simple, energy consumption is low, volume is little, response is fast, damping force in a big way continuously along inverse adjustable, good temperature stability and be easy to be combined with computer good characteristics such as realizing intelligentized control method, can overcome that traditional passive damping device feedback of status amount difficulty is surveyed, active controlling force energy consumption is large and the defect such as time lag and spilling, is applicable to the actuator as the shimmy control of structure.Due to the control effects that it is good, magnetorheological shimmy damper has an enormous advantage in shimmy control, and application prospect is very extensive.
Accompanying drawing explanation
Fig. 1 is vertical view cutaway drawing of the present invention;
Fig. 2 is front sectional view of the present invention;
Fig. 3 is the I portion enlarged view in Fig. 1;
Fig. 4 is that the A-A of Fig. 2 is to sectional view;
Fig. 5 is the structural representation that the adjustable lever pin of damper regulation mechanism in the present invention inserts in damping hole;
Fig. 6 is perspective view of the present invention.
Description of reference numerals:
1-spherical plain bearing rod end, 2-piston rod, 3-cylinder barrel, 4-piston assembly, 5-regulates thimble, 6-governor sleeve, 7-pressure ring, 8-circlip, 9-O type circle, 10-end cap, 11-positioning hole, 12-center hole, 13-mounting hole, 14-minor axis, 15A-magnetic conduction annular distance, 15B-attachment hole, 16-pin, 17-T type magnetism resistent ring, 18-porous type guide ring, the 19-magnetic conduction collar, 20-coil, the 21-helical groove magnetic conduction collar, 22-coiling magnetic guiding loop, 23-nut, 24-epoxy resin, the large damping hole of 25-, the little damping hole of 26-.
Embodiment
Below by accompanying drawing in conjunction with the embodiments, the present invention is further described, and following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
A kind of damp adjustable magnetorheological shimmy damper, as Fig. 1, shown in Fig. 2, comprise cylinder barrel 3, piston rod 2, piston assembly 4 and damper regulation mechanism, the left end radial integrated symmetry of described cylinder barrel is shaped with two minor axises 14 for being connected with aircraft, the right part co-axial seal of this cylinder barrel is provided with end cap 10, 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, coaxial installation one piston assembly on piston rod on the left of described cylinder barrel, to should in the cylinder barrel of piston assembly right side piston rod on to be coaxially slidably installed damper regulation mechanism, the left part coaxial threaded of described piston rod connects spherical plain bearing rod end 1.In the process of this shimmy-damper of assembling, for convenience's sake, by pin 16, damper regulation mechanism and piston rod are linked together.
In the present embodiment, 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 12, the right part radial symmetric of this piston rod is shaped with the mounting hole 13 of fixing damper regulation mechanism, the inboard radial direction of piston rod being positioned at this mounting hole is shaped with two positioning holes 11, the central axis angle of this positioning hole is 30 degree, the inner end portion spaced radial of this piston rod is shaped with two attachment hole 15B be communicated with described piston assembly, and this attachment hole and positioning hole are all communicated with center hole.
Described piston assembly is left, right symmetrical structure, as shown in Figure 3, comprise a pair helical groove magnetic conduction collar 21, a pair magnetic conduction collar 19, coiling magnetic guiding loop 22 and porous type guide ring 18, 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 (not marking in figure), in two annular grooves, reverse-winding has coil 20 respectively, these two groups of coils are secondary parallel way, and adopt around to contrary heteropleural canoe in parallel, two groups of coils can work simultaneously or work alone, the certain thickness epoxy resin 24 of external application of this coil is to play seal action, bottom two annular grooves, equal radial direction is shaped with the magnetic conduction annular distance 15A (as shown in Figure 2) 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 23, coiling magnetic guiding loop outer rim coaxial package a pair magnetic conduction collar between the described helical groove magnetic conduction collar is relative, in order to avoid magnetic flux forms loop via concentrating flux sleeve ring, cause leakage field, T-shaped magnetism resistent ring 17 is installed between the helical groove magnetic conduction collar and the magnetic conduction collar, coaxial installation one porous type guide ring in the groove be shaped with between these two magnetic conduction collar opposed ends, 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 25, as shown in Figure 4, porous type guide ring between adjacent two large damping holes is axially uniform is shaped with little damping hole 26 (little damping hole is equally also six), this large and small damping hole is positioned at same circumference, namely the axis angle of adjacent large and small damping hole is α is 30 degree, 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.
The outer rim of the described helical groove magnetic conduction collar is shaped with spiral chute, spiral fluted degree of depth 0.5mm, pitch 1mm, and the gap B between this helical groove magnetic conduction collar maximum outside diameter and inner wall of cylinder is 2mm.The effect of this helical groove is the flow characteristic that can give full play to magnetic flow liquid, reduces viscous force, reduces sedimentation and the alluvial of magnetic flow liquid, prevents bubble.
The structure of described damper regulation mechanism as shown in Figure 1 and Figure 2, comprise governor sleeve 6 and regulate thimble 5, 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 six adjustment thimbles, 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.In the process of debugging, mobile damper regulation mechanism, when six adjustment shanks insert large damping hole completely, the sectional area of large damping hole is identical with little damping hole, namely changes the size of damping hole; When damper regulation mechanism rotates 30 degree, when regulating shank all to insert little damping hole, little damping hole is blocked completely, and only large damping hole is by magnetic flow liquid, namely reduces the quantity of damping hole.
In order to prevent regulating thimble to loosen, be coaxially fixedly mounted with pressure ring 7 on the right side of described governor sleeve annular endplate, circlip 8 is installed in the outside of this pressure ring.
In order to improve the sealability of this shimmy-damper, equal mounting O-shaped rings 9 between described cylinder barrel and piston rod, between governor sleeve and piston rod, between end cap and cylinder barrel and piston rod.
Large (or little) damping hole quantity in the present invention is determined by initial damping force and flow, and the quantity in the present embodiment is 6.
Damp channel in the present invention is in series by the annular damper passage of symmetry and little damping hole (or large damping hole), and guarantee do not have magnetic field to pass through during little damping hole (or large damping hole) structural design, and two ends annular damper passage regulates the viscosity flowing through magnetic flow liquid herein by externally-applied magnetic field.
Using method of the present invention is:
According to the damping of the first testing airplane front-wheel of different types, and then the size of initial damping force when regulating shimmy-damper work, concrete grammar is:
Damping due to rotation controlling mechanism rotates 30 degree relative to piston assembly, will regulate thimble insertion greatly in (or little) damping hole, by being locked by damper regulation mechanism in the positioning hole of pin insertion piston rod.By regulating thimble to insert different large and small damping hole, the damping force effect of generation is also different, uses pin to be fixed on the piston rod by damper regulation mechanism, can be arranged on the component of aircraft nose wheel column after adjustment.
Working principle of the present invention is described below:
After applying electric current to two groups of coils, the total magnetic flux that hot-wire coil produces is shunted when flowing through piston assembly two ends, part magnetic flux directly flows to casing wall in piston assembly edge by damp channel, and first another part magnetic flux flows to the magnetic conduction collar, then via concentrating flux sleeve circulation to casing wall.According to above-mentioned magnetic flux flows mode, the damp channel above shimmy-damper piston assembly two ends and the magnetic conduction collar is all effective active lengths, makes effective active length of damp channel substantially cover piston total length, takes full advantage of effective damping passage.
Use before shimmy-damper, when aircraft is in the sliding race process of taking off or landing, aircraft nose wheel can produce that to depart from the one that wheel neutral position intercouples in side direction and torsional direction acutely shimmy.The piston rod trying hard to recommend dynamic shimmy-damper of shimmy generation moves back and forth, and the change in displacement of piston rod has driven the flowing of magnetic flow liquid in cylinder barrel, and the magnetic flow liquid at piston two ends is back and forth flowed by the damping hole of porous type guide ring.When magnetic flow liquid flows through the helical groove magnetic conduction collar, porous type guide ring and the magnetic conduction collar, larger viscous force can be produced, by mobile damper regulation mechanism, the method regulating shank to insert the damping hole of porous type guide ring can be come size, the quantity in damping adjusting hole, and then regulate the size of initial damping force when subtracting swinging mechanism work, according to inserting varying in size of damping hole, the damping force effect of generation is also different.
The invention has the beneficial effects as follows:
This shimmy-damper damping force has multiple regulative mode, and one is change the damping hole quantity of porous type guide ring, size to realize the adjustment of initial damping by damper regulation mechanism; Two is the shear yield strengths by regulating input current to change damp channel gap location magnetic flow liquid, realizes the adjustment of shimmy-damper damping force; Three be without externally-applied magnetic field or externally-applied magnetic field more weak time, the spiral chute of the helical groove magnetic conduction collar can give full play to the mobile performance of magnetic flow liquid, reduces viscous force, reduces the sedimentation of magnetic flow liquid and alluvial, prevents bubble from producing.Damp channel in the present invention is in series by the annular damper passage of symmetry and little damping hole (or large damping hole), and guarantee do not have magnetic field to pass through during little damping hole (or large damping hole) structural design, and two ends annular damper passage regulates the viscosity flowing through magnetic flow liquid herein by externally-applied magnetic field.
The present invention can ensure the minimum damping under zero magnetic field condition, can increase again the regulation range of the damping force of shimmy-damper.Coil adopts the mode of secondary parallel connection, and the canoe of heteropleural parallel connection effectively reduces the response time of shimmy-damper, increases the controllability of speed of response and damping force, improves the working efficiency of shimmy-damper.The magnetic conduction collar changes magnetic flux flows mode, makes effective active length of damp channel substantially can cover whole piston, makes full use of effective damping passage.Because it has good damping property and controllability, can effectively prevent and eliminate the shimmy phenomenon of aircraft nose landing gear.
It is emphasized that; embodiment of the present invention is illustrative; instead of it is determinate; therefore the present invention includes the embodiment be not limited to described in embodiment; every other mode of executions drawn by those skilled in the art's technological scheme according to the present invention, belong to the scope of protection of the invention equally.
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.
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| CN201410767028.8A CN104455178B (en) | 2014-12-11 | 2014-12-11 | A kind of damp adjustable magnetorheological shimmy damper |
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| CN201410767028.8A CN104455178B (en) | 2014-12-11 | 2014-12-11 | A kind of damp adjustable magnetorheological shimmy damper |
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| CN107021212A (en) * | 2017-03-03 | 2017-08-08 | 中国民航大学 | A kind of plate turning type magnetorheological shimmy damper for undercarriage |
| CN108412938A (en) * | 2018-01-31 | 2018-08-17 | 武汉船用机械有限责任公司 | A kind of adjustable hydraulic damping unit |
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| CN109764775A (en) * | 2018-12-26 | 2019-05-17 | 中国船舶重工集团公司第七一0研究所 | A kind of low impact firer's actuator |
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| CN109573778A (en) * | 2019-01-02 | 2019-04-05 | 广州广日电梯工业有限公司 | A kind of magnetorheological buffer of elevator and control method |
| CN111196354A (en) * | 2020-02-07 | 2020-05-26 | 任年栋 | Control method for magnetorheological shimmy damper of aircraft landing gear |
| CN111196354B (en) * | 2020-02-07 | 2021-09-28 | 北京保力马测控技术有限公司 | Control method for magnetorheological shimmy damper of aircraft landing gear |
| CN112211941A (en) * | 2020-09-10 | 2021-01-12 | 东风汽车集团有限公司 | Adjustable air spring |
| CN113757292B (en) * | 2021-09-16 | 2022-11-11 | 昆明理工大学 | Multi-channel aircraft landing gear magneto-rheological shimmy damper, control method, system and application |
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| CN114919738A (en) * | 2022-05-25 | 2022-08-19 | 南京航空航天大学 | Undercarriage shimmy damping device with nonlinear inerter |
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