CN102878960B - Series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration - Google Patents
Series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration Download PDFInfo
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- CN102878960B CN102878960B CN201210395006.4A CN201210395006A CN102878960B CN 102878960 B CN102878960 B CN 102878960B CN 201210395006 A CN201210395006 A CN 201210395006A CN 102878960 B CN102878960 B CN 102878960B
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Abstract
The invention discloses a series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration. The series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration comprises a large hydraulic cylinder, a small hydraulic cylinder, a universal joint, a flange disc, a door truss and a cantilever truss. The large hydraulic cylinder is installed on the door truss through the universal joint. A piston rod of the large hydraulic cylinder is connected with an upper cover of the flange disc through a thread. A jacket of a cylinder body of the small hydraulic cylinder is connected with a lower cover of the flange disc. The cylinder bodies of the large and small hydraulic cylinders are vertical and arranged axially. A piston rod of the small hydraulic cylinder is connected with the end part of a small end of the cantilever truss. According to the series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration provided by the invention, the piston rod of the large hydraulic cylinder travels upward to an appointed position and is locked, and the piston rod of the small hydraulic cylinder vibrates at high frequency and with small amplitude in the appointed position so that the series hydraulic cylinder can be matched in use with a longspan and large deflection truss test table to simulate dynamic deformation of wings in the process of take-off and flight of an airplane. The stroke and frequency response range of the series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration are respectively dependent on the large and small hydraulic cylinders, and the series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration has the advantages of simple structure, low cost, convenience in installation and maintenance, and agile combination manner.
Description
Technical field
The invention belongs to field of mechanical technique, further relate to a kind of Long travel motion in technical field of hydraulic pressure and short-stroke high-frequency vibration series cylinder.The present invention, by controlling the characteristics of motion of large small cylinder stage by stage respectively, can realize three kinds of utility functions, and one is upwards promote when large hydraulic cylinder piston rod, and small cylinder piston rod keeps meta, realizes Long Distances enhanced feature; Two is that small cylinder piston rod dither, realizes short-stroke high-frequency vibrating function when large hydraulic cylinder piston rod keeps original position; Three is after large hydraulic cylinder piston rod is upwards promoted to a certain position, small cylinder piston rod dither, after realizing Long Distances lifter motion to assigned address, does short-stroke high-frequency vibration at assigned address.Its purposes be with a kind of large span, large deflection cantilever testing table with the use of, carry out simulated aircraft and take off and the dynamic deformation of wing in flight course.
Background technology
In aircraft flight, wing can, because of reason generation Complex Elastic vibrations such as stream pressures, due to wing self structure and the complicacy of its geometric distortion, be difficult to adopt the classical theory of Elasticity to carry out calculating simulation.And if directly employing Practical Wings carries out flight environment of vehicle vibration test, particularly for large span wing, then need to pay high experimentation cost, or even cannot realize in reality.
Patent " a kind of distributed POS ground demonstration verification system " (application number 201110242911.1 that BJ University of Aeronautics & Astronautics applies at it, applying date 2011.08.23, publication number CN102322873A) disclose a kind of distributed POS ground demonstration verification system, wherein relate to a kind of wing simulation system, for simulating the aircraft wing of dynamic deformation.Wing simulation system is made up of 3 meters of lead aircraft wing analog boards and shaking table, and the middle partial fixing of 3 meters of analog boards on a vibration table, drives wing analog board by shaking table, carrys out the vibration of simulated aircraft engine.The deficiency that this patented technology exists is that first the method adopts 3 meters of lead aircraft wing analog boards, limits the length of simulation wing, can not simulate large span aircraft wing.Secondly the method adopts shaking table to drive wing analog board, because shaking table can only add foundation displacement excitation, only can simulate wing to be out of shape in equilibrium position up-down vibration, therefore wing analog board can not be made to produce Large Deflection Deformation to simulate the dynamic deformation in wing take-off process by shaking table, effective Deformation control can not be done to wing analog board.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, design the motion of a kind of Long travel and short-stroke high-frequency vibration series cylinder, coordinate large span, large deflection cantilever testing table to carry out simulated aircraft and take off and the dynamic deformation of wing in flight course.
Concrete thought of the present invention is: utilize the existing large advantage of hydraulic cylinder Long travel motion and the advantage of small cylinder short stroke energy high frequency response, by structural suitable connection, make the cylinder device after connection can realize Long travel motion, can realize again doing short-stroke high-frequency vibration at assigned address, and then use the cylinder device after connecting to drive cantilever testing table to carry out simulated aircraft to take off and the dynamic deformation of wing in flight course.
To achieve these goals, the present invention includes large hydraulic cylinder, small cylinder, universal joint, ring flange, gate-type truss and cantilever truss.Large hydraulic cylinder is arranged on gate-type truss by universal joint, the piston rod of large hydraulic cylinder is connected with the upper cover of ring flange by screw thread, small cylinder cylinder body overcoat is connected with the lower cover of ring flange, size hydraulic cylinder body is vertically arranged vertically, and the piston rod in small cylinder is connected with cantilever truss small end end.
The present invention compared with prior art tool has the following advantages:
First, because the present invention adopts series cylinder to coordinate cantilever testing table to carry out the dynamic deformation of simulated aircraft wing, overcoming prior art shaking table coordinates wing analog board can only simulate the shortcoming of short-span aircraft wing flutter, and the present invention is had, and array mode is flexible, the advantage of applied range.
Second, due to the connected mode that the present invention adopts large small cylinder to be connected by ring flange, by the reasonable switching of two hydraulic cylinder piston rod motions, Long travel motion can be realized, can realize again doing short-stroke high-frequency vibration at assigned address, solve the shortcoming that prior art can only simulate wing flutter, make the present invention have structure advantage simple, with low cost, easy to installation and maintenance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is size hydraulic cylinder structure schematic diagram of the present invention;
Fig. 3 is gimbal structure schematic diagram of the present invention;
Fig. 4 is flange plate structure schematic diagram of the present invention.
In figure: 1 is large hydraulic cylinder, 2 is small cylinder, and 3 is universal joint, and 4 is ring flange, and 5 is gate-type truss, 6 is cantilever truss, and 7 is earrings, and 8 is servo-valve, and 9 is position transducer, 10 is bar base plate, and 11 is main floor, and 12 is bearing seat, and 13 is adjustment lining, 14 is screw shell, and 15 is nut, and 16 is outer shroud, and 17 is inner ring, 18 is outer shaft, and 19 is bearing, and 20 is interior axle, and 21 is upper cover, 22 is back up pad, and 23 is lower cover, and 24 is reinforcement, and 25 is triangle muscle.
Embodiment
Below in conjunction with accompanying drawing 1, the present invention is described in further detail.
The present invention includes large hydraulic cylinder 1, small cylinder 2, universal joint 3, ring flange 4, gate-type truss 5 and cantilever truss 6.Large hydraulic cylinder 1 is arranged on gate-type truss 5 by universal joint 3, the piston rod of large hydraulic cylinder 1 is connected by the upper cover of screw thread with ring flange 4, small cylinder 2 cylinder body overcoat is connected with the lower cover of ring flange 4, size hydraulic cylinder body is vertically arranged vertically, and the piston rod in small cylinder 2 is connected with cantilever truss 6 small end end.When large hydraulic cylinder 1 piston rod is up, drive small cylinder 2 and piston rod thereof together on move, arrive after appointment requires position, large hydraulic cylinder 1 piston rod is locked in fixed position, small cylinder 2 is started working afterwards, and piston rod drives cantilever truss 6 to do high frequency, low amplitude vibrations.
The structural representation of large small cylinder as shown in Figure 2, wherein Fig. 2 (a) is the structural representation of large hydraulic cylinder 1, large hydraulic cylinder 1 selects unsymmetric structure hydraulic cylinder, two-way tape snubber assembly and locking device, it controls stroke and is greater than more than 2 meters, and the piston rod rod end structure of large hydraulic cylinder 1 is screw-type.Snubber assembly protects large hydraulic cylinder 1 can eliminate impact when starting or stop, and reduces vibration.Large hydraulic cylinder 1 piston can not rotate in cylinder, and prevent large hydraulic cylinder 1 cylinder body and small cylinder 2 cylinder body from relatively rotating, dangerous accident occurs, and internal leakage is little as far as possible.Large hydraulic cylinder 1 selects the object of unsymmetric structure hydraulic cylinder to be the length that can reduce large hydraulic cylinder 1, then can reduce gate-type truss 5 height, increase its structural stability.
Fig. 2 (b) is the structural representation of small cylinder 2, small cylinder 2 selects symmetrical structure hydraulic cylinder, the piston rod rod end structure of small cylinder 2 is earrings 7, and servo-valve 8 is arranged on small cylinder 2 by adapter, and position transducer 9 is built on small cylinder 2 cylinder body sleeve.Small cylinder 2 selects the object of symmetrical structure hydraulic cylinder to be that the active area of hydraulic oil to piston both sides is equal, when charge oil pressure and flow constant time, make reciprocating motion of the pistons speed and acting force also all equal.
As shown in Figure 3, universal joint 3 comprises bar base plate 10, main floor 11, bearing seat 12, adjustment lining 13, screw shell 14, nut 15, outer shroud 16, inner ring 17, outer shaft 18, bearing 19 and interior axle 20 to the structural representation of universal joint.Bar base plate 10 is welded on gate-type truss 5, main floor 11 is designed with four spacing holes, is fixed on bar base plate 10 by screw by main floor 11, and main floor 11 can be made like this on bar base plate 10, to have certain adjustment surplus along gate-type truss 5 length direction.Bearing seat 12 is designed with two spacing holes, is fixed on main floor 11 by screw by bearing seat 12, and bearing seat 12 can be made like this on main floor 11, to have certain adjustment surplus along gate-type truss 5 Width.Screw shell 14 two ends are threaded portion, be welded on the centre position of large hydraulic cylinder 1, be connected with screw shell 14 by adjustment lining 13, nut 15, make large hydraulic cylinder 1 be fixedly mounted on gate-type truss 5 by universal joint 3, setting nut 15 can make series cylinder threadingly sleeve 14 have certain adjustment surplus.Outer shroud 16 is connected with bearing seat 12 by outer shaft 18, bearing 19, and inner ring 17 is connected with outer shroud 16 by bearing 19, interior axle 20, ensures that universal joint 3 can rotate with outer shaft 18 both direction around interior axle 20.
The main floor 11 of universal joint 3 has certain adjustment surplus along gate-type truss 5 length direction on bar base plate 10, bearing seat 12 has certain adjustment surplus along gate-type truss 5 Width on main floor 11, setting nut 15 can make series cylinder threadingly sleeve 14 have certain adjustment surplus.Like this by adjustment main floor 11, bearing seat 12 and setting nut 15, just can ensure that the initial relative position of series cylinder and cantilever truss 6 is coordinated.Universal joint 3 is fixedly mounted on gate-type truss 5, can rotate with outer shaft 18 both direction around interior axle 20, when cantilever truss 6 retroaction to the external force of small cylinder 2 piston rod be not vertically vertically downward or upwards time, or universal joint 3 is when there is deviation in installation site on gate-type truss 5, series cylinder can self-adaptation external force generation small angle deflection, prevents piston rod stuck or damage.
As shown in Figure 4, ring flange 4 comprises upper cover 21, back up pad 22, lower cover 23, reinforcement 24, triangle muscle 25 to the structural representation of ring flange.Be provided with threaded hole in the middle of upper cover 21, this threaded hole is threaded with large hydraulic cylinder 1 piston rod end.Be provided with through hole in the middle of lower cover 23, this through hole coordinates with small cylinder 2 cylinder body overcoat, is provided with four minor thread holes around, and lower cover 23 and small cylinder 2 cylinder body overcoat are fixed by four bolts, upper cover 21 and lower cover 23 are welded on the two ends of back up pad 22 respectively.Triangle muscle 25 is furnished with the junction of back up pad 22 at upper cover 21 and lower cover 23, back up pad 22 both sides are welded with reinforcement 24, reinforcement 24 and triangle muscle 25 can increase structural strength and the rigidity of ring flange 4, and when preventing large hydraulic cylinder 1 piston rod from moving downward, ring flange 4 flexing occurs and lost efficacy.
The course of work of the present invention is:
Under initial situation, large hydraulic cylinder 1 piston rod and small cylinder 2 piston rod all in maximum projecting position, now cantilever truss 6 simulated aircraft wing naturally droop location status.
When large hydraulic cylinder 1 piston rod upwards promotes, ring flange 4, small cylinder 2 and piston rod thereof are together along with moving upward, cantilever truss 6 small end end is driven upwards to promote, it should be noted that because cantilever truss 6 holds end winding support greatly in the process, small end end can't move upward merely, but can swing toward stiff end while moving upward, make series cylinder by universal joint 3 self-adaptation cantilever truss 6 reacting force generation small angle deflection.After cantilever truss 6 arrives desired location, large hydraulic cylinder 1 piston rod is locked in fixed position, and small cylinder 2 piston rod is upwards regained and remains on meta, realizes the Long Distances enhanced feature of series cylinder, drive cantilever truss 6 Large Deflection Deformation, be used for the state of simulated aircraft wing when taking off.
Maximumly stretch out state when large hydraulic cylinder 1 piston rod remains on, small cylinder 2 piston rod is first regained meta and is done dither again, realizes the short-stroke high-frequency vibrating function of series cylinder, drives cantilever truss 6 dither, is used for the vibration of simulated aircraft wing.
When large hydraulic cylinder 1 piston rod is upwards promoted to a certain position, small cylinder 2 piston rod is first regained meta and is done dither again, after realizing the lifter motion to assigned address of series cylinder Long Distances, short-stroke high-frequency vibration is done at assigned address, drive cantilever truss 6 Large Deflection Deformation to assigned address, do dither at assigned address again, being used for simulated aircraft takes off and the dynamic deformation of wing in flight course.
Claims (5)
1. Long travel motion and short-stroke high-frequency vibration series cylinder, comprise large hydraulic cylinder (1), small cylinder (2); It is characterized in that, described large hydraulic cylinder (1) is arranged on gate-type truss (5) by universal joint (3), the piston rod of large hydraulic cylinder (1) is connected with the upper cover (21) of ring flange (4) by screw thread, small cylinder (2) cylinder body overcoat is connected with the lower cover (23) of ring flange (4), size hydraulic cylinder body is vertically arranged vertically, and the piston rod in small cylinder (2) is connected with cantilever truss (6) small end end.
2. require described Long travel motion and short-stroke high-frequency vibration series cylinder according to right 1, it is characterized in that, described large hydraulic cylinder (1) selects unsymmetric structure hydraulic cylinder, two-way tape snubber assembly and locking device, it controls stroke and is greater than more than 2 meters, and the piston rod rod end structure of large hydraulic cylinder (1) is screw-type.
3. require described Long travel motion and short-stroke high-frequency vibration series cylinder according to right 1, it is characterized in that, described small cylinder (2) selects symmetrical structure hydraulic cylinder, the piston rod rod end structure of small cylinder (2) is Earrings type, be connected with cantilever truss (6) small end end by earrings (7), servo-valve (8) is arranged on small cylinder (2) by adapter, and position transducer (9) is built on small cylinder (2) cylinder body sleeve.
4. require described Long travel motion and short-stroke high-frequency vibration series cylinder according to right 1, it is characterized in that, described universal joint (3) comprises bar base plate (10), main floor (11), bearing seat (12), adjustment lining (13), screw shell (14), nut (15), outer shroud (16), inner ring (17), outer shaft (18), bearing (19) and interior axle (20); Described bar base plate (10) is welded on gate-type truss (5), main floor (11) is designed with four spacing holes, is fixed on bar base plate (10) by screw by main floor (11); Described bearing seat (12) is designed with two spacing holes, is fixed on main floor (11) by screw by bearing seat (12); Described screw shell (14) two ends are threaded portion, be welded on the centre position of large hydraulic cylinder (1), be connected with screw shell (14) by adjustment lining (13), nut (15), make large hydraulic cylinder (1) be fixedly mounted on gate-type truss (5) by universal joint (3); Described outer shroud (16) is connected with bearing seat (12) by outer shaft (18), bearing (19), and inner ring (17) is connected with outer shroud (16) by bearing (19), interior axle (20).
5. require described Long travel motion and short-stroke high-frequency vibration series cylinder according to right 1, it is characterized in that, described ring flange (4) comprises upper cover (21), back up pad (22), lower cover (23), reinforcement (24), triangle muscle (25); Be provided with threaded hole in the middle of described upper cover (21), this threaded hole is threaded with large hydraulic cylinder (1) piston rod end; Through hole is provided with in the middle of described lower cover (23), this through hole coordinates with small cylinder (2) cylinder body overcoat, be provided with four minor thread holes around, by four bolts, lower cover (23) and small cylinder (2) cylinder body overcoat be fixed; Described upper cover (21) and lower cover (23) are welded on the two ends of back up pad (22) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210395006.4A CN102878960B (en) | 2012-09-29 | 2012-09-29 | Series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210395006.4A CN102878960B (en) | 2012-09-29 | 2012-09-29 | Series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration |
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| Publication Number | Publication Date |
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| CN102878960A CN102878960A (en) | 2013-01-16 |
| CN102878960B true CN102878960B (en) | 2015-06-17 |
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| CN201210395006.4A Expired - Fee Related CN102878960B (en) | 2012-09-29 | 2012-09-29 | Series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105697470B (en) * | 2016-01-18 | 2017-06-30 | 西安电子科技大学 | The hydraulic motion control system and method for a kind of cantilever truss fatigue test |
| CN106596020B (en) * | 2016-12-30 | 2023-06-30 | 北京工业大学 | Folding wing dynamics characteristic experimental device |
| CN110594213A (en) * | 2019-09-12 | 2019-12-20 | 清华大学 | Electro-hydraulic servo actuator capable of realizing long-stroke high-frequency loading and control method |
| WO2021046985A1 (en) * | 2019-09-12 | 2021-03-18 | 清华大学 | Electro-hydraulic servo actuator for implementing long-path and high-frequency loading, and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS59216031A (en) * | 1983-05-24 | 1984-12-06 | Hitachi Cable Ltd | Vibration testing device of automobile parts |
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Patent Citations (2)
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|---|---|---|---|---|
| CN101492766A (en) * | 2009-03-16 | 2009-07-29 | 苏州长菱测试技术有限公司 | Vibration aging method and device employing electric vibratory test system |
| CN102146678A (en) * | 2010-11-29 | 2011-08-10 | 天津市海王星海上工程技术有限公司 | Mechanical ballast device for reinforcing conduit rack |
Non-Patent Citations (1)
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| 副油箱弹射系统的力学分析与软件协同仿真;胡森强等;《机械强度》;20110131;第33卷(第1期);第034-039页 * |
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Granted publication date: 20150617 Termination date: 20200929 |