CN107021212B - A kind of plate turning type magnetorheological shimmy damper for undercarriage - Google Patents

A kind of plate turning type magnetorheological shimmy damper for undercarriage Download PDF

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Publication number
CN107021212B
CN107021212B CN201710123477.2A CN201710123477A CN107021212B CN 107021212 B CN107021212 B CN 107021212B CN 201710123477 A CN201710123477 A CN 201710123477A CN 107021212 B CN107021212 B CN 107021212B
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China
Prior art keywords
transmission shaft
cylinder barrel
undercarriage
end cap
turning type
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CN201710123477.2A
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Chinese (zh)
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CN107021212A (en
Inventor
祝世兴
耿凡
魏德功
刘小川
杨正权
田静
杨永刚
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Civil Aviation University of China
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Civil Aviation University of China
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C25/00—Alighting gear
    • B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface 
    • B64C25/50—Steerable undercarriages; Shimmy-damping
    • B64C25/505—Shimmy damping
    • 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
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Vibration Prevention Devices (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The present invention relates to a kind of plate turning type magnetorheological shimmy dampers for undercarriage, including cylinder barrel, end cap, stator module and rotor assembly, the both ends co-axial seal of the cylinder barrel installs end cap, stator module is symmetrically fixedly mounted in the cylinder barrel of each end cap inboard, transmission shaft is coaxially installed in cylinder barrel between two stator modules, rotor assembly is installed, transmission shaft driving rotor assembly rotates in cylinder barrel, and the one end of the transmission shaft installs double rocker mechanism on the transmission shaft in the cylinder barrel.The present invention is a kind of shimmy control device of half active, it can guarantee the minimum damping under zero magnetic field condition, the adjustable range of the damping force of shimmy-damper can be increased again, with structure is simple, low energy consumption, small in size, response is fast, damping force is continuous along the inverse good characteristics such as adjustable in a big way, overcome traditional passive damping device state feedback quantity difficulty to survey, energy consumption is high and time lag and the defects of overflow for active controlling force, be suitable as the actuator of the shimmy control of structure.

Description

A kind of plate turning type magnetorheological shimmy damper for undercarriage
Technical field
The invention belongs to airplane spare parts fields, are related to undercarriage, especially a kind of rotating plate for undercarriage Formula magnetorheological shimmy damper.
Background technique
The aircraft of tricycle landing gear layout, during taking off and alightinging run, front-wheel can occur to deviate wherein The violent sideshake of vertical position.This swing is mainly derived from undercarriage swing part and rotates around its orientation axes alternation, with And the cyclic deformation that tire and ground contact portion accordingly occur.Front-wheel shimmy of airplane is by undercarriage damper leg, front-wheel Lateral vibration and the front-wheel twisting vibration around pillar axes intercouple the extremely complex self-excited vibration of caused one kind, dimension The energy for holding this self-excited vibration is that power and torque of the ground effects on tire provide during being run by aircraft is sliding.
The shimmy phenomenon of nose-gear will cause undercarriage high vibration, and the vibration is vertical with wheel rolling direction and its amplitude Increase rapidly, while causing the violent shake of fuselage, not only it is sliding to ground surface high speed when taking off and landing run stability and Maneuverability has great influence, and will increase the alternate stress of undercarriage and airframe structure, increases fatigue damage, shortens use Service life, in some instances it may even be possible to cause the structural destruction of body parts and undercarriage and the generation of accident.Even in the worst case, it can directly result in Aviation accident.
The many aircrafts in home and abroad all occurred different degrees of shimmy in development and use.J-8, Y-11, the Y- in China 12 wait aircrafts in development, and J-5, J-6, TY-4 wait aircrafts to encounter different degrees of shimmy problem in use；U.S. C- 119, F7U-3, L-1011 wait aircrafts also to occur in development shimmy.For another example during the development of China's model aircraft is taken a flight test Once pitot was caused to be broken because shimmy of front wheels occurs, and the shimmy generated fatigue fracture influence frequently occurred is then dropped significantly The low service life of the model aircraft undercarriage.In short, shimmy of front wheels is a kind of very harmful self-excited vibration, it is necessary to set The meter stage is prevented.
Currently, the common effective measures for preventing nose-gear shimmy be installation shimmy-damper or using turn control system into Row subtracts pendulum, and optimizes in the Landing Gear Design stage.Shimmy-damper is generally divided into piston type and plate turning type, applies in plate turning type More is oil liquid formula shimmy-damper, and this throttle orifice is usually to vary with temperature and passively adjust, due in limit oil valve bar Surrounding installs the different adjustment spring of two kinds of coefficients of expansion, and spring can be varied with temperature and be deflected, so that damping force is adjusted, tradition Shimmy-damper adjustable range it is limited, and structure is considerably complicated.
Summary of the invention
The purpose of invention is the defect for being to make up in the prior art, and providing a kind of has that damping characteristic is good, damping is adjustable Plate turning type magnetorheological shimmy damper, the present invention replaces traditional piston type oil liquid shimmy-damper, realizes it with more simple structure Semi- active control, to weaken the shimmy phenomenon of front-wheel when aircraft slides race.
The scheme of the invention is be achieved:
A kind of plate turning type magnetorheological shimmy damper for undercarriage, including cylinder barrel, end cap, stator module and rotor Component, the both ends co-axial seal of the cylinder barrel install end cap, are symmetrically fixedly mounted with stator module in the cylinder barrel of each end cap inboard, and two Transmission shaft is coaxially installed in cylinder barrel between a stator module, both ends are respectively positioned on outside cylinder barrel, the transmission shaft in the cylinder barrel On rotor assembly is installed, transmission shaft driving rotor assembly rotates in cylinder barrel, and the one end of the transmission shaft installs double rocking lever Mechanism；
The rotor assembly includes flabellum and every being fixedly mounted with two groups of flabellums, every group of fan with shaft staggered on disk, the transmission shaft Leaf is four paws structure, and clamping one is I-shaped every disk on the transmission shaft between two groups of flabellums, and the corresponding transmission shaft every disk is recessed Magnet exciting coil is wound in slot；The outer rim of every group of flabellum is inserted every magnetic tenon piece, is each formed centainly every magnetic tenon piece and inner wall of cylinder Gap.
Moreover, the stator module includes ring flange and partition, which is mounted on the cylinder barrel end of end cap inboard, should The inner end circumference uniform distribution of ring flange is fixedly mounted with four partitions, and each partition is plugged in inner wall of cylinder.
Moreover, the subtended angle of the flabellum is 50 degree, maximum pendulum angle is 15 degree.
Moreover, the gap is 1 millimeter, 0.7 millimeter, 0.5 millimeter, 0.2 millimeter.
Moreover, installing bearing between the both ends and end cap of the transmission shaft, it is equipped on the transmission shaft of bearing inboard The locknut of fixed flabellum.
Moreover, be equipped with centre bore in the middle part of the transmission shaft, it is coated in the centre bore for being connect with magnet exciting coil Conducting wire.
Moreover, being co-axially mounted a torsional spring on the left of the transmission shaft, the one end of the torsional spring is fixed on transmission shaft, the torsional spring The other end be fixed on end cap.
Moreover, the end cap radial direction for being located at right side installs bleed screw.
Moreover, the outer rim every disk be uniformly equipped with it is fluted, flabellum and between disk using O-ring seal.
The advantages and positive effects of the present invention are:
1, the present invention uses plate turning type magnetorheological shimmy damper, has power output big, low in energy consumption, adjustable extent is big, response speed Fastly, the features such as structure is simple, and angle active control damping force size can be rotated according to front-wheel.
2, the damping force of shimmy-damper of the present invention has a variety of regulative modes, first is that being changed by replacement tenon piece gauge size The spacing of throttle chink is to realize the adjusting initially damped；Second is that changing damp channel gap location magnetic by adjusting input current The shear yield strength of rheology liquid realizes the adjusting of shimmy-damper damping force；Third is that can be realized initially by one group of additional torsional spring In tune, in the case where external torque, it is possible to increase can be changed initial damping force.
3, damping gap of the invention uses not contour structure, the tenon piece every magnetic has been installed additional at tongue-and-groove, due to blade Width is larger, causes the length in damping gap longer, can reduce response speed；The height for increasing damping gap, is easy to cause resistance The reduction of Buddhist nun's power.The controllability of response speed and damping force can be taken into account using not contour damping gap；Tenon piece is can root According to what is needed replacing, convenient for adjusting initial damping force, magnetic saturation phenomenon can be also prevented.
4, the present invention combines mode with gap between cylinder body gap and blade using flabellum, can enhance magnetic liquid mobility, prevents Only magnetic grain is in flabellum root packing phenomenon.
5, the flabellum of rotor assembly uses four paws structure in the present invention, and according to studied type, practical pivot angle is 5 degree, warp Double rocker mechanism transmitting is crossed, shimmy-damper pivot angle is amplified to 15 degree, increases magnetic flow quantity, and then increase damping force, also increase Heat dissipation effect is added.Flabellum interlocks docking mode.After loading current, magnetic field is formed into a loop along cylinder body mostly, but still is had small Part reduces magnetic field utilization rate directly from magnetic liquid stream mistake, using staggeredly docking, can reduce the positive area between magnetizer, into And reduce the magnetic field for flowing through magnetic liquid, increase magnetic field utilization rate.
6, of the invention to be formed with one week groove every disk outer rim, when being rotated together with magnetic conduction flabellum, in addition to guiding magnetic induction line It walks outward, moreover it is possible to play certain damping action, increase outputs damping torque.
7, the present invention is a kind of shimmy control device of half active, can guarantee the minimum damping under zero magnetic field condition, and can increase Add the adjustable range of the damping force of shimmy-damper, with structure is simple, low energy consumption, small in size, response is fast, damping force is in larger range It is interior it is continuous along inverse adjustable, good temperature stability and be easy to be implemented in combination with the good characteristics such as intelligentized control method with computer, Traditional passive damping device state feedback quantity difficulty can be overcome to survey, energy consumption is high and time lag and the defects of overflow for active controlling force, fit For the actuator as the shimmy control of structure.Due to its good control effect, magnetorheological shimmy damper has in shimmy control Very big superiority, application prospect are very extensive.
Detailed description of the invention
Fig. 1 is schematic perspective view of the invention；
Fig. 2 is the cross-sectional view of Fig. 1；
Fig. 3 is the sectional view along A-A of Fig. 2；
Fig. 4 is the schematic perspective view of rotor assembly in Fig. 2.
Description of symbols:
1- double rocker mechanism, 2- end cap, 3- cylinder barrel, 4- transmission shaft, 5- ring flange, 6- are every disk, 7- flabellum, 8- every magnetic tenon Piece, 9- bearing, 10- flat key, 11- bleed screw, 12- magnet exciting coil, 13- locknut, 14- centre bore, 15- torsional spring, 16- are magnetorheological Liquid, 17- partition.
Specific embodiment
The invention will be further described with reference to the accompanying drawing and by specific embodiment.
A kind of plate turning type magnetorheological shimmy damper for undercarriage, as shown in Figure 1 and Figure 2, including permeability magnetic material is made Cylinder barrel 3, end cap 2, stator module and rotor assembly made of magnetic separator, the both ends co-axial seal installation of the cylinder barrel End cap is symmetrically fixedly mounted with stator module in the cylinder barrel of each end cap inboard, coaxially installs biography in the cylinder barrel between two stator modules Moving axis 4, the transmission shaft are hierarchic structure, and both ends are respectively positioned on outside cylinder barrel, are equipped with rotor on the transmission shaft in the cylinder barrel Component, transmission shaft driving rotor assembly rotate in cylinder barrel, and the one end of the transmission shaft installs double rocker mechanism 1.
The stator module includes ring flange 5 and partition 17, and as shown in Figure 2 and Figure 3, which is mounted on end cap inboard Cylinder barrel end, the inner end circumference uniform distribution of the ring flange is fixedly mounted with four partitions, and cylinder barrel is divided into four working chambers by four partitions, Each partition is plugged in inner wall of cylinder, the rotary spacing for ring flange.
The rotor assembly includes flabellum 7 and every being fixedly mounted with two groups of flabellums with shaft staggered on disk 6, the transmission shaft, and every group Flabellum is four paws structure, and subtended angle is 50 degree, and maximum pendulum angle is 15 degree, and clamping has an I-shaped on the transmission shaft between two groups of flabellums Type every disk, corresponding every being wound with magnet exciting coil 12 in the transmission shaft groove of disk, the coil turn of the magnet exciting coil is 600 Circle, enamel covered wire diameter are 0.25 millimeter, are full of magnetorheological fluid 16 in closed cylinder barrel；It is described to be used to that magnetic circuit be guided to walk every disk To encapsulated coil is played the role of in root.The outer rim of every group of flabellum can insert different-thickness every magnetic tenon piece 8, should be every magnetic tenon The gap that piece and inner wall of cylinder are formed are as follows: 1 millimeter, 0.7 millimeter, 0.5 millimeter, 0.2 millimeter.
Bearing 9 is installed between the both ends and end cap of the transmission shaft, fixation is installed on the transmission shaft of bearing inboard The locknut 13 of flabellum installs sealing ring, passes through two nut-locking flabellums in the present embodiment attached drawing between the locknut and flabellum, should It is equipped with centre bore 14 in the middle part of transmission shaft, the conducting wire for connecting with magnet exciting coil is coated in the centre bore and (is not shown in figure Out).
A torsional spring 15 is co-axially mounted on the left of the transmission shaft, the one end of the torsional spring is fixed on transmission shaft, the torsional spring End cap is fixed in the other end.The torsional spring prevents the rotation of flabellum in middle position state when flabellum starts for guaranteeing in initially tune Gyration is excessive to collide with partition, while can increase and can be changed initial damping force.One flat key 10 is housed on the right side of transmission shaft, is made Wheel hub and axis are able to circumferentially fixed to transmit torque.
End cap radial direction positioned at right side installs bleed screw 11, and effect is: when assembly end cap, end cap during screw-in Interior air can enter cylinder barrel together, will cause shimmy-damper work power output it is unstable, have phenomena such as noise.Air vent need to be designed, Excessive gas is discharged, end cap after the installation is completed, then screws bleed screw.
The outer rim every disk be uniformly equipped with it is fluted, as shown in figure 4, certain damping action can be played, flabellum with every It is sealed between disk using O-ring.
It is inserted with the tenon piece every magnetic at the tongue-and-groove of flabellum outer rim, gauge size can be replaced as needed, adjusts initial damping force, Magnetic saturation phenomenon can be effectively prevent using not contour structure simultaneously, take into account response speed and damping force；The inner wall of cylinder with it is right Slit-shaped between the four paws flabellum outer rim of title circularizes damp channel.
The operation principle of the present invention is that:
When front-wheel occurs shimmy, the anti-torque arm on nose-gear pillar will drive double rocker mechanism, transmit torque to On shimmy-damper transmission shaft and then four paws flabellum is driven, makes flabellum reciprocating rotation at a certain angle in cylinder barrel, in the promotion of flabellum Under, two different chambers of pressure are formed, force the intracorporal fluid of high pressure chest by being formed between flabellum outer rim and inboard wall of cylinder block Gap (i.e. annular damper channel) enter low pressure volumes in, fluid can generate effect during flowing through throttle chink repeatedly Power, which can generate a damping torque to nose-gear pillar axes, thus inhibit shimmy, and make the machine of shimmy generation Tool can be transformed into thermal dissipation, to play the role of subtracting pendulum.
Transmission shaft of the invention is connected by double rocker mechanism with nose-gear barrel, and magnet exciting coil end is connect at one On the current stabilization DC power supply positive and negative electrode for exporting current adjustment.After galvanization, the transmission shaft for being wound with magnet exciting coil generates magnetic field, magnetic Feel line and successively pass through flabellum, magnetorheological fluid, cylinder barrel from axis one end, and symmetrically flow back to the other end of transmission shaft, after being magnetized Magnetorheological fluid viscosity increase, to obtain the biggish moment of resistance, then by adjusting the output electric current of power supply, magnetic can be changed The size of field intensity achievees the purpose that subtract pendulum to change the moment of resistance.
It is emphasized that embodiment of the present invention be it is illustrative, without being restrictive, therefore packet of the present invention Include and be not limited to embodiment described in specific embodiment, it is all by those skilled in the art according to the technique and scheme of the present invention The other embodiments obtained, also belong to the scope of protection of the invention.

Claims (9)

1. a kind of plate turning type magnetorheological shimmy damper for undercarriage, it is characterised in that: including cylinder barrel, end cap, stator pack Part and rotor assembly, the both ends co-axial seal of the cylinder barrel are installed end cap, are symmetrically fixedly mounted in the cylinder barrel of each end cap inboard Stator module coaxially installs transmission shaft in the cylinder barrel between two stator modules, and both ends are respectively positioned on outside cylinder barrel, the cylinder barrel Rotor assembly is installed, transmission shaft driving rotor assembly rotates in cylinder barrel, the one end of the transmission shaft on interior transmission shaft Double rocker mechanism is installed；
The rotor assembly includes flabellum and every being fixedly mounted with two groups of flabellums with shaft staggered on disk, the transmission shaft, and every group of flabellum is Four paws structure, clamping one is I-shaped every disk on the transmission shaft between two groups of flabellums, corresponding every in the transmission shaft groove of disk It is wound with magnet exciting coil；The outer rim of every group of flabellum is inserted every magnetic tenon piece, each every magnetic tenon piece and inner wall of cylinder formed it is certain between Gap.
2. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that: described fixed Sub-component includes ring flange and partition, which is mounted on the cylinder barrel end of end cap inboard, the inner end circumference of the ring flange Four partitions are uniformly fixedly mounted with, each partition is plugged in inner wall of cylinder.
3. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that: the fan The subtended angle of leaf is 50 degree, and maximum pendulum angle is 15 degree.
4. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that: between described Gap is 1 millimeter, 0.7 millimeter, 0.5 millimeter, 0.2 millimeter.
5. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that: the biography Bearing is installed between the both ends and end cap of moving axis, the locknut of fixed flabellum is installed on the transmission shaft of bearing inboard.
6. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that: the biography It is provided with centre bore in the middle part of moving axis, the conducting wire for connecting with magnet exciting coil is coated in the centre bore.
7. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that: the biography A torsional spring is co-axially mounted on the left of moving axis, the one end of the torsional spring is fixed on transmission shaft, and end is fixed in the other end of the torsional spring Lid.
8. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that: be located at the right side The end cap radial direction of side installs bleed screw.
9. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that: it is described every The outer rim of disk be uniformly arranged it is fluted, flabellum and between disk using O-ring seal.
CN201710123477.2A 2017-03-03 2017-03-03 A kind of plate turning type magnetorheological shimmy damper for undercarriage Active CN107021212B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230182892A1 (en) * 2021-12-14 2023-06-15 Goodrich Corporation Self-sustaining shimmy damper system for landing gear shock strut assemblies

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11492104B2 (en) 2020-03-19 2022-11-08 Goodrich Corporation Magnetic self-centering shimmy damper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2830562A (en) * 1954-01-21 1958-04-15 Cleveland Pneumatic Tool Co Hydraulic ball screw type steering motor and shimmy damper
CN103523218A (en) * 2013-10-12 2014-01-22 中国航天空气动力技术研究院 Unmanned plane damping-adjustable front-wheel shimmy-damper
CN104455178A (en) * 2014-12-11 2015-03-25 中国民航大学 Damping-adjustable magneto-rheological lag damper
CN105626754A (en) * 2016-02-29 2016-06-01 东南大学 Multi-fin rotary magneto-rheological fluid damper based on S-shaped magnetic circuit
EP3093238A1 (en) * 2015-05-12 2016-11-16 Safran Landing Systems An aircraft undercarriage with shimmy-damping means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2830562A (en) * 1954-01-21 1958-04-15 Cleveland Pneumatic Tool Co Hydraulic ball screw type steering motor and shimmy damper
CN103523218A (en) * 2013-10-12 2014-01-22 中国航天空气动力技术研究院 Unmanned plane damping-adjustable front-wheel shimmy-damper
CN104455178A (en) * 2014-12-11 2015-03-25 中国民航大学 Damping-adjustable magneto-rheological lag damper
EP3093238A1 (en) * 2015-05-12 2016-11-16 Safran Landing Systems An aircraft undercarriage with shimmy-damping means
CN105626754A (en) * 2016-02-29 2016-06-01 东南大学 Multi-fin rotary magneto-rheological fluid damper based on S-shaped magnetic circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230182892A1 (en) * 2021-12-14 2023-06-15 Goodrich Corporation Self-sustaining shimmy damper system for landing gear shock strut assemblies

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