CN107021212A - 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
CN107021212A
CN107021212A CN201710123477.2A CN201710123477A CN107021212A CN 107021212 A CN107021212 A CN 107021212A CN 201710123477 A CN201710123477 A CN 201710123477A CN 107021212 A CN107021212 A CN 107021212A
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CN
China
Prior art keywords
power transmission
transmission shaft
cylinder barrel
undercarriage
turning type
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Granted
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CN201710123477.2A
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Chinese (zh)
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CN107021212B (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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Priority to CN201710123477.2A priority Critical patent/CN107021212B/en
Publication of CN107021212A publication Critical patent/CN107021212A/en
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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 damper 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, symmetrically stator module is fixedly mounted with the inboard cylinder barrel of each end cap, coaxially power transmission shaft is installed in cylinder barrel between two stator modules, rotor assembly is installed, power transmission shaft driving rotor assembly is rotated in cylinder barrel, and the one end of the power transmission shaft installs double rocker mechanism on the power transmission shaft in the cylinder barrel.The present invention is a kind of shimmy control device of half active, it can guarantee that the minimum damping under zero magnetic field condition, the adjustable range of the damping force of shimmy-damper can be increased again, with simple in construction, energy consumption is low, small volume, response be fast, damping force is interior continuous along the inverse good characteristic such as adjustable in a big way, overcome traditional passive damping device feedback of status amount hardly possible survey, active controlling force energy consumption big and the defect such as time lag and spilling, it is adaptable to be used 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 field, it is related to undercarriage, especially a kind of rotating plate for undercarriage Formula magnetorheological shimmy damper.
Background technology
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 rotated 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 caused a kind of extremely complex self-excited vibration that intercoupled around the front-wheel twisting vibration of pillar axes, dimension The energy for holding this self-excited vibration is that power and torque of the ground effects on tire are provided during aircraft cunning race.
The shimmy phenomenon of nose-gear can cause undercarriage high vibration, and the vibration is vertical with wheel rolling direction and its amplitude Rapid increase, while cause the violent shake of fuselage, not only the ground surface high speed taken off and during land is slided run stability and Maneuverability has material impact, and can increase the alternate stress of undercarriage and airframe structure, increases fatigue damage, shortens and use Life-span, in some instances it may even be possible to cause structural destruction and the generation of accident of body parts and undercarriage.During most serious, 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, Y- of China 12 grade aircrafts are in development, and the aircraft such as J-5, J-6, TY-4 all ran into different degrees of shimmy problem in use；U.S. C- 119th, the aircraft such as F7U-3, L-1011 also occurred shimmy in development.For another example during the development of China's model aircraft is taken a flight test Once because occur shimmy of front wheels and caused by pitot be broken, and frequently occur it is shimmy produced by fatigue fracture influence then drop significantly The low service life of the model aircraft undercarriage.In a word, shimmy of front wheels is a kind of very harmful self-excited vibration, it is necessary to set The meter stage is to be prevented.
At present, the conventional effective measures for preventing nose-gear shimmy are to install shimmy-damper or entered using turn control system Row subtracts pendulum, and is optimized in the Landing Gear Design stage.Shimmy-damper is generally divided into piston type and plate turning type, plate turning type and applied More is fluid formula shimmy-damper, and this throttle orifice is typically to vary with temperature and passively adjust, due in limit oil valve bar Surrounding installs the different regulation spring of two kinds of coefficients of expansion, and spring can be varied with temperature and deflected, so that damping force is adjusted, tradition Shimmy-damper adjustable range it is limited, and structure is considerably complicated.
The content of the invention
The purpose of invention is to be to make up defect in prior art to have that damping characteristic is good, it is adjustable to damp there is provided one kind Plate turning type magnetorheological shimmy damper, the traditional piston type fluid shimmy-damper of present invention substitution realizes it with more simple structure Semi- active control, to weaken the shimmy phenomenon of front-wheel when aircraft slides race.
What the solution of the present invention was realized in：
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, which is installed in end cap, the inboard cylinder barrel of each end cap, is symmetrically fixedly mounted with stator module, two Power transmission shaft coaxially is installed in cylinder barrel between individual stator module, its both ends is respectively positioned on outside cylinder barrel, the power transmission shaft in the cylinder barrel On rotor assembly is installed, power transmission shaft driving rotor assembly is rotated in cylinder barrel, the one end installation double rocking lever of the power transmission shaft Mechanism.
Moreover, the stator module includes ring flange and dividing plate, the ring flange is arranged on the inboard cylinder barrel end of end cap, should The inner end circumference uniform distribution of ring flange is fixedly mounted with four dividing plates, and each dividing plate is plugged in inner wall of cylinder.
Moreover, the rotor assembly includes flabellum and every disk, two groups of flabellums are fixedly mounted with shaft staggered on the power transmission shaft, often Flabellum is organized for four paws structure, clamping one is I-shaped every disk, transmission of the correspondence every disk on the power transmission shaft between two groups of flabellums Magnet exciting coil is wound with axle groove；The outer rim of every group of flabellum is inserted every magnetic tenon piece, is each formed every magnetic tenon piece and inner wall of cylinder Certain gap.
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 of the power transmission shaft and end cap, it is provided with the inboard power transmission shaft of the bearing The locknut of fixed flabellum.
Moreover, being formed with centre bore in the middle part of the power transmission shaft, it is coated with the centre bore for leading for being connected with magnet exciting coil Line.
Moreover, being co-axially mounted a torsion spring on the left of the power transmission shaft, the one end of the torsion spring is fixed on power transmission shaft, the torsion spring The other end be fixed on end cap.
Moreover, the end cap radial direction positioned at right side installs bleed screw.
Moreover, the outer rim every disk is uniformly formed with groove, flabellum and sealed between disk using O-ring.
Advantages and positive effects of the present invention are：
1st, the present invention uses plate turning type magnetorheological shimmy damper, big with exerting oneself, low in energy consumption, and adjustable extent is big, response speed It hurry up, the features such as simple in construction, and can be according to front-wheel anglec of rotation active control damping force size.
2nd, the damping force of shimmy-damper of the present invention has a variety of regulative modes, and one is changed by changing tenon piece gauge size The regulation that the spacing of throttle chink is initially damped with realizing；Two be to change damp channel gap location magnetic by adjusting input current The shear yield strength of rheology liquid, realizes the regulation of shimmy-damper damping force；Three can be realized initially by one group of additional torsion spring In tune, in the case of external torque, it is possible to increase variable initial damping force.
3rd, 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 for damping gap longer, can reduce response speed；The height in increase damping gap, is easily caused 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 needing what is changed, it is easy to adjust initial damping force, can also prevents magnetic saturation phenomenon.
4th, the present invention is combined mode using flabellum with gap between cylinder body gap and blade, can strengthen magnetic liquid mobility, prevents Only magnetic grain is in flabellum root packing phenomenon.
5th, the flabellum of rotor assembly uses four paws structure in the present invention, according to studied type, and actual pivot angle is 5 degree, warp Double rocker mechanism transmission is crossed, shimmy-damper pivot angle is amplified to 15 degree, adds magnetic flow quantity, and then increases damping force, also increases Radiating effect is added.Flabellum interlocks docking mode.After loading current, magnetic field has small mostly along cylinder body formation loop Part is directly flowed through from magnetic liquid, reduces magnetic field utilization rate, using staggeredly docking, can reduce the facing area between magnetic conductor, enter And reduce the magnetic field for flowing through magnetic liquid, increase magnetic field utilization rate.
6th, it is of the invention to be formed with one week groove every disk outer rim, when together being rotated with magnetic conduction flabellum, except guiding magnetic induction line Walk outwards, moreover it is possible to play certain damping action, increase outputs damping torque.
7th, the present invention is a kind of shimmy control device of half active, can guarantee that the minimum damping under zero magnetic field condition, can increase again Plus the adjustable range of the damping force of shimmy-damper, with simple in construction, energy consumption is low, small volume, response be fast, damping force is in a big way 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 feedback of status amount hardly possible survey, active controlling force energy consumption can be overcome big and the defect such as time lag and spilling, fitted 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 is quite varied.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of the present invention；
Fig. 2 is Fig. 1 sectional view；
Fig. 3 is Fig. 2 A-A to sectional view；
Fig. 4 is the dimensional structure diagram of rotor assembly in Fig. 2.
Description of reference numerals：
1- double rocker mechanisms, 2- end caps, 3- cylinder barrels, 4- power transmission shafts, 5- ring flanges, 6- are every disk, 7- flabellums, 8- every magnetic tenon Piece, 9- bearings, 10- flat keys, 11- bleed screws, 12- magnet exciting coils, 13- locknuts, 14- centre bores, 15- torsion springs, 16- are magnetorheological Liquid, 17- dividing plates.
Embodiment
Below in conjunction with the accompanying drawings and the invention will be further described 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, the NULL end cap 2, stator module and the rotor assembly that are made, the both ends co-axial seal of the cylinder barrel installs Symmetrical be fixedly mounted with the cylinder barrel between stator module, two stator modules coaxially installs biography in end cap, the inboard cylinder barrel of each end cap Moving axis 4, the power transmission shaft is hierarchic structure, and its both ends is respectively positioned on outside cylinder barrel, and rotor is provided with the power transmission shaft in the cylinder barrel Component, power transmission shaft driving rotor assembly is rotated in cylinder barrel, and the one end of the power transmission shaft installs double rocker mechanism 1.
The stator module includes ring flange 5 and dividing plate 17, as shown in Figure 2 and Figure 3, and it is inboard that the ring flange is arranged on end cap Cylinder barrel end, the inner end circumference uniform distribution of the ring flange is fixedly mounted with four dividing plates, and cylinder barrel is divided into four working chambers by four dividing plates, Each dividing plate 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, every group with shaft staggered on disk 6, the power transmission shaft 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 power transmission shaft between two groups of flabellums Type every disk, correspondence is every being wound with magnet exciting coil 12 in the power transmission shaft groove of disk, the coil turn of the magnet exciting coil is 600 Magnetic flow liquid 16 is full of in circle, a diameter of 0.25 millimeter of enamel covered wire, closed cylinder barrel；It is described to be used to guide magnetic circuit to walk every disk To encapsulated coil is played a part of in its root.The outer rim of every group of flabellum can insert different-thickness every magnetic tenon piece 8, should every magnetic tenon The gap that piece is formed with inner wall of cylinder is：1 millimeter, 0.7 millimeter, 0.5 millimeter, 0.2 millimeter.
Installed between the both ends of the power transmission shaft and end cap and fixation is installed on bearing 9, the inboard power transmission shaft of the bearing The locknut 13 of flabellum, is installed between the locknut and flabellum by two nut-locking flabellums in sealing ring, the present embodiment accompanying drawing, should Centre bore 14 is formed with the middle part of power transmission shaft, the wire (not shown) for being connected with magnet exciting coil is coated with the centre bore.
A torsion spring 15 is co-axially mounted on the left of the power transmission shaft, the one end of the torsion spring is fixed on power transmission shaft, the torsion spring End cap is fixed in the other end.The torsion spring is used in initially adjusting, it is ensured that middle position state is in when flabellum starts, the rotation of flabellum is prevented Gyration is excessive to collide with dividing plate, while can increase variable initial damping force.One flat key 10 is housed on the right side of power transmission shaft, made Wheel hub and axle are able to circumferentially fixed to transmit moment of torsion.
End cap radial direction positioned at right side installs bleed screw 11, and its effect is：When assembling end cap, the end cap during screw-in Interior air can together enter cylinder barrel, shimmy-damper work can be caused to exert oneself unstable, there is the phenomenons such as noise.Air vent need to be designed, Excessive gas is discharged, after end cap is installed, then bleed screw is screwed.
The outer rim every disk is uniformly formed with groove, as shown in figure 4, certain damping action can be played, flabellum with every magnetic Sealed between disk using O-ring.
The tenon piece every magnetic is inserted with the tongue-and-groove of flabellum outer rim, gauge size can be changed as needed, initial damping force is adjusted, Magnetic saturation phenomenon can effectively be prevented using not contour structure simultaneously, response speed and damping force is taken into account；The inner wall of cylinder with it is right Slit-shaped between the four paws flabellum outer rim of title circularizes damp channel.
The present invention operation principle be：
When front-wheel occurs shimmy, the anti-torque arm on nose-gear pillar can drive double rocker mechanism, transmit torque to On shimmy-damper power transmission shaft and then four paws flabellum is driven, make flabellum reciprocating rotation at a certain angle in cylinder barrel, in the promotion of flabellum Under, the different chamber of two pressure is formed, the fluid in high-pressure chamber is forced by being formed between flabellum outer rim and inboard wall of cylinder block Gap (i.e. annular damper passage) enter low pressure volumes in, fluid can be acted during throttle chink is flowed through repeatedly Power, the power can produce a damping torque to nose-gear pillar axes, thus suppress shimmy, and make the machine of shimmy generation Tool can be transformed into thermal dissipation, so as to play a part of subtracting pendulum.
The power transmission shaft of the present invention is connected by double rocker mechanism with nose-gear barrel, and magnet exciting coil termination is connected on into one On the adjustable current stabilization dc source positive and negative electrode of output current.After galvanization, the power transmission shaft for being wound with magnet exciting coil produces magnetic field, magnetic Line is felt from axle one end, successively by flabellum, magnetic flow liquid, cylinder barrel, and the other end of power transmission shaft is symmetrically flowed back to, after being magnetized Magnetic flow liquid viscosity increase, so that the larger moment of resistance is obtained, then by the output current of regulation power supply, with regard to magnetic can be changed The size of field intensity, so as to change the moment of resistance, reaches the purpose for subtracting pendulum.
It is emphasized that embodiment of the present invention is illustrative, rather than it is limited, therefore present invention bag Include and be not limited to embodiment described in embodiment, it is every by those skilled in the art's technique according to the invention scheme The other embodiment drawn, also belongs to the scope of protection of the invention.

Claims (10)

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 is installed symmetrically to be fixedly mounted with end cap, the inboard cylinder barrel of each end cap Power transmission shaft coaxially is installed in cylinder barrel between stator module, two stator modules, its both ends is respectively positioned on outside cylinder barrel, the cylinder barrel Rotor assembly is installed, power transmission shaft driving rotor assembly is rotated in cylinder barrel, the one end of the power transmission shaft on interior power transmission shaft Double rocker mechanism is installed.
2. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that：It is described fixed Sub-component includes ring flange and dividing plate, and the ring flange is arranged on the inboard cylinder barrel end of end cap, the inner end circumference of the ring flange Four dividing plates uniformly are fixedly mounted with, each dividing plate 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：Described turn Sub-component includes flabellum and every disk, is fixedly mounted with two groups of flabellums with shaft staggered on the power transmission shaft, every group of flabellum is four paws structure, two Clamping one is I-shaped every disk on power transmission shaft between group flabellum, and correspondence in the power transmission shaft groove of disk every being wound with excitation wire Circle；The outer rim inserting of every group of flabellum each forms certain gap every magnetic tenon piece every magnetic tenon piece and inner wall of cylinder.
4. the plate turning type magnetorheological shimmy damper according to claim 3 for undercarriage, it is characterised in that：The fan The subtended angle of leaf is 50 degree, and maximum pendulum angle is 15 degree.
5. the plate turning type magnetorheological shimmy damper according to claim 3 for undercarriage, it is characterised in that：Described Gap is 1 millimeter, 0.7 millimeter, 0.5 millimeter, 0.2 millimeter.
6. the plate turning type magnetorheological shimmy damper according to claim 3 for undercarriage, it is characterised in that：It is described to pass Bearing is installed between the both ends of moving axis and end cap, the locknut of fixed flabellum is installed on the inboard power transmission shaft of the bearing.
7. the plate turning type magnetorheological shimmy damper according to claim 3 for undercarriage, it is characterised in that：It is described to pass Centre bore is formed with the middle part of moving axis, the wire for being connected with magnet exciting coil is coated with the centre bore.
8. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that：It is described to pass A torsion spring is co-axially mounted on the left of moving axis, the one end of the torsion spring is fixed on power transmission shaft, end is fixed in the other end of the torsion spring Lid.
9. the plate turning type magnetorheological shimmy damper according to claim 1 for undercarriage, it is characterised in that：Positioned at the right side The end cap radial direction of side installs bleed screw.
10. the plate turning type magnetorheological shimmy damper according to claim 3 for undercarriage, it is characterised in that：It is described Groove is uniformly formed with every the outer rim of disk, flabellum and is sealed between disk using O-ring.
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
EP3882137A1 (en) * 2020-03-19 2021-09-22 Goodrich Corporation Magnetic self-centering shimmy damper

Families Citing this family (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

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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3882137A1 (en) * 2020-03-19 2021-09-22 Goodrich Corporation Magnetic self-centering shimmy damper
US11492104B2 (en) 2020-03-19 2022-11-08 Goodrich Corporation Magnetic self-centering shimmy damper

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