CN1005899B - Electrohydraulic servo vibration exciting installation - Google Patents
Electrohydraulic servo vibration exciting installation Download PDFInfo
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- CN1005899B CN1005899B CN86105899.2A CN86105899A CN1005899B CN 1005899 B CN1005899 B CN 1005899B CN 86105899 A CN86105899 A CN 86105899A CN 1005899 B CN1005899 B CN 1005899B
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- electrohydraulic servo
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Abstract
The present invention relates to an electrohydraulic servo vibration exciter which comprises a control device, a servo valve controlled by the control device, and a vibration exciter controlled by the servo valve, wherein the vibration exciter is mainly composed of a piston shaft and a piston sleeve (cylinder body). The piston sleeve in the vibration exciter is sheathed on the piston shaft, and two working chambers are arranged between the piston shaft and the piston sleeve; both the piston sleeve and the piston shaft are arranged in a box body, the piston shaft is fixed on the box body connected with a tested object, and corresponding to the piston shaft, the piston sleeve is movable. The vibration exciter has the advantages of compact structure, small volume, convenient installation and easy control and adjustment, and especially has no need of additional counter-force supporting points, such as counter-force walls or suspended weights.
Description
The present invention relates to a kind of electrohydraulic servo vibration exciting installation, it comprises control device, for example computing machine, analog controller, by the servo-valve of their control and by servo-valve control be the vibrator of power source with the pressure fluid medium, vibrator mainly is made up of the axis of the piston, piston bush (cylinder body).
The most frequently used up to now mechanical eccentric formula vibrator has simple in structure, the advantage that cost is low, but its precision is low, can only produce sinusoidal wave exciting force, frequency band is narrow, volume and deadweight are bigger, and it is bigger that the space that needs is installed, and its range of application is very limited, especially it can't satisfy to test specimen implement multi-point exciting when obtaining pure mode to the vibrator requirement, because of a plurality of mechanical eccentric formula vibrators are realized adjusting synchronously very difficult.
Though the high control of general electromagnetic actuator precision is convenient, its low frequency characteristic is bad, and exerting oneself when low frequency requires when big overall dimensions and weight is all very big and efficient is low, therefore seldom is used for prototype samples and earthquake engineering.
Be the electrohydraulic servo vibration exciting device that overcome above-mentioned shortcoming developed recently, this vibrator is a power source with the pressure fluid medium, by servo-valve vibrator is controlled, and low frequency characteristic is good, the exciting of random waveform can be realized, particularly the requirement that multi-point exciting is controlled each vibrator can be satisfied.
In known such exciting device sees 1979 11 sea floor exploration technology nd Annual Meeting " forced vibration tests of deep water platform " literary composition.This exciting device is made up of hydraulic servo vibrator, servo controller and control device as shown in Figure 1.One end of vibrator is fixedlyed connected with the big mass of suspention by load-sensing unit by the axis of the piston, big mass uses flexible metal chain suspention, the other end of vibrator is hinged by the support root on cylinder body and the platform table top, be provided with displacement transducer between cylinder body and the axis of the piston, the output signal of displacement transducer is compared with the input signal of servo-valve, realizes the control to vibrator.Inertial force when vibrator when work moves mass by cylinder body as the counter-force fulcrum with the big mass of suspention passes to test specimen.The motion of mass can be sinusoidal, also can be random waveform, so test specimen can obtain corresponding exciting force.
Another kind of scheme as shown in Figure 2, The Nomenclature Composition and Structure of Complexes principle and the device shown in Figure 1 of this device are basic identical, are that big mass as the counter-force fulcrum changes tumbling-type into by suspension type.This test specimen is a dam.
Though above-mentioned known electrohydraulic servo vibration exciting device can remedy the deficiency of mechanical eccentric formula vibrator and electromagnetic actuator in some aspects, but the big mass that it must rely on counter force wall in use or be equivalent to counter force wall is as fulcrum, therefore it is very huge to test desired servicing unit, this is especially under the situation of multi-point exciting, make experiment work complicated and expensive big, under some can't the situation of installation quality piece even can not use.
The purpose of this invention is to provide a kind of novel electrohydraulic servo vibration exciting installation, it can overcome the shortcoming of mechanical eccentric vibrator and electromagnetic actuator, have that low frequency characteristic is good, the characteristics of the exciting force of big, the exportable random waveform of exerting oneself, and compare with existing electrohydraulic servo vibration exciting device, it does not need counter force wall, so optional equipment is few easy for installation.
The characteristics of the electrohydraulic servo vibration exciting installation of the present invention that achieves the above object are:
Piston bush is provided with two working chambers in the vibrator between them on the axis of the piston, and on the casing that the axis of the piston is fixed in subjects links to each other, and piston bush is transportable with respect to the axis of the piston.
The axis of the piston is installed on the casing by force transducer in its one or both ends, measures the resulting exciting force size of test specimen, frequency and waveform thus.When installing, stress imposes certain pretightning force for guaranteeing that force transducer is in all the time in the course of work.
The influence that the degree of regulation of servo-valve is caused when reducing to vibrate, make during installation the valve core of servo valve axis with perpendicular to the angle on the plane of the axis of the piston in the scopes of-45～+ 45 degree.
Be beneficial to operation under water for casing can all be sealed, servo-valve can be contained on the interior the axis of the piston of casing.
In order to make compact conformation, the oil circuit that leads to working chamber is arranged in the axis of the piston.
Described control device is the various signals that the time record according to work, through processing, relatively the back is controlled servo-valve, acceleration, speed and displacement transducer have been installed on piston bush for this reason or have only been installed one kind of or two kinds.Equally, acceleration, speed and displacement transducer have been installed also on casing, or one or both only have been installed wherein.For the influence that compensation temperature is brought system, temperature sensor has been installed also.These signal of sensor all are defeated by control device.
For guaranteeing piston bush motion vertically reliably, be provided with guide piece, it can be a guide plate, on casing, piston bush slides on guide plate by steel ball guide plate by spring-loaded.It also can be a guide rod, and piston bush holds to match to merge thereon with guide rod by bobbin and slides.
For the purpose of guaranteeing safety, also be provided with Machine guarding, as the travel switch of limited piston cover maximum displacement, cushion pad, buffering lubricating pad etc.
For reducing the friction force between the axis of the piston and the piston bush and improving the life-span, the mating surface place on the axis of the piston adopts spraying nylon spare.
Hang screw for ease of transporting also to be provided with.
Below by the present invention is further illustrated by Fig. 3 and two illustrated embodiment of Fig. 4.
Fig. 3 is the synoptic diagram of a kind of embodiment of electrohydraulic servo vibration exciting device of the present invention, and it mainly comprises casing 13, the axis of the piston 1 and the piston bush 3 of sealing.Casing 13 can be square, circular or other shape, and it is fixed on the test specimen by screw or other stationary installation, and the axis of the piston 1 is fixedly linked by force transducer 41 and casing.Piston bush 3 is sleeved on the axis of the piston 1 and can slides on axle, between the axis of the piston 1 and piston bush 3, be provided with plunger shaft 23 and 25, the fuel feeding of these two plunger shaft and oil return are to be controlled by the servo-valve 17 that is installed on the axis of the piston 1, pressure medium enters working oil chamber 23,25 by the oil circuit 43,45 that is arranged in the axis of the piston 1, and servo-valve 17 is controlled by the computing machine that does not illustrate in the drawings.Be to reduce the influence of exciting force to the servo-valve precision, the valve core axis that preferably makes servo-valve when mounted with perpendicular to the angle on the plane of the axis of the piston ± 45 spend between.Piston bush 3 preferably makes polygon, also can make cylindrical as square, the outside surface of polygon prism has the smooth flat of respective numbers, smooth flat is supported on the slide plate 9 by steel ball 11, piston bush 3 can be moved at the guiding lower edge of steel ball 11 axis direction, therefore reduced the load that produced by piston bush 3 on the axis of the piston 1, guarantee between the axis of the piston 1 and the piston bush 3 simultaneously and cooperates along circumferentially even reliable operation, slide plate 9 is supported on the inside surface of casing 13 by spring 5, when vibrator produces temperature rise in the course of the work, piston bush outwards expands, because the existence of spring 5 prevents that piston bush 3 is stuck, or reduces exerting oneself of vibrator.Stop collar 7 is used to prevent that support spring 5 from producing when piston bush 3 moves crooked.Two pipe adapters 19,21 of the input and output of pressure oil on casing link to each other with pressure oil-source, and servo-valve 17 links to each other with pipe adapter 19,21 by oil pipe.Under control at computing machine, pressure medium through servo-valve when oil duct 43 enters oil pocket 23, then piston bush is to the direction motion of arrow (a) indication, meanwhile the axis of the piston is together with casing, and the test specimen that links to each other with casing moves to (b) direction, at this moment the pressure medium in the oil pocket 25 refluxes through servo-valve 17 through oil duct 45 again, under the control of pressure oil at computing machine conversely through servo-valve, oil duct 45 enters oil pocket 25, piston bush then, the axis of the piston, casing, test specimen all obtains the motion opposite with above-mentioned direction, by this way, send instruction by computing machine signal as requested, the control servo-valve, thereby control piston cover 3 motion in the intended manner, thereby make test specimen obtain the exciting force of the certain waveform of certain frequency.For guaranteeing that the vibration shape and frequency that test specimen can obtain to require are equipped with acceleration transducer 27, speed pickup 29 and displacement transducer 31, the acceleration of motion, speed and the displacement that are used to measure piston bush on piston bush.For measuring the vibration situation of test specimen, acceleration transducer 33, speed pickup 35 and displacement transducer 37 are housed in casing.Also be provided with temperature sensor 39 in the casing and be used to measure the interior temperature of casing,, need in time measure environment temperature and compensate because hydraulic system is relatively more responsive to temperature.The signal of all these sensors is all imported computing machine, is handled by the program of establishment in advance, controls servo-valve in time to guarantee waveform, frequency and the size of power output.To guarantee simultaneously that when multi-point exciting each exciting point obtains desired phase relation.Whole box body makes airtight, and all hermetically by casing, therefore this vibrator can be used under water for pipe adapter and cable.
An alternative embodiment of the invention is shown in Fig. 4, and it mainly comprises casing 13, piston bush 3, the axis of the piston 1, force transducer 41, displacement transducer 31, acceleration transducer 27 and electrohydraulic servo valve 17 etc.
The axis of the piston 1 two ends respectively are installed on the casing 13 by a force transducer 41, here adopted piezoelectric force transducer, and impose a pretightning force when mounted, and be in stress all the time with the confining force sensor, can directly record real power in simple mode thus in the zeroing of pretension state.
Piston bush 3 and the axis of the piston 1 are sliding fit, be to reduce the friction force between the axis of the piston 1 of piston bush 3, adopt the spraying nylon spare 49,55 that the life-span is long, friction force is little with matching surface at the axis of the piston 1 on the piston bush, and combination sealing is adopted in motive seal.Wherein sealing ring 48 adopts and fills poly-tetrafluoro hexene material, wear-resisting, good airproof performance.
In the present embodiment, on the bearing seat that electrohydraulic servo valve 17 is installed in casing links to each other.Its valve core axis with perpendicular to the angle on the plane of the axis of the piston 1 in ± 45 degree scopes.
Have screw on the bearing seat 38 and 58, can also can radially with by excitation structure be connected along vibrator with the axial connection of test specimen by base plate 87 by connector.
Hang screw 82 be used for the transportation hang.
Present embodiment is provided with three kinds of Machine guardings; one is the travel switch of limited piston maximum displacement; its two buffing pad 16,18 and cushion pad 14 for constituting by the rubberite material, they play damping effect, and it three plays a protective role for leaving certain thickness buffering lubricating pad 20 in the axis of the piston.
The invention has the advantages that: it can not only produce the exciting force that sine wave can also produce random waveform, and this is particularly important in earthquake engineering; Realize synchro control and precision height easily, size of exerting oneself and waveform are easy to adjust, and the force transducer between the axis of the piston and the casing can be measured exciting force quickly and accurately, the wide low frequency that is particularly suited for of frequency; Under identical condition of exerting oneself, other type vibrator of the volume ratio of apparatus of the present invention is all much smaller.As to exert oneself be 20 tons vibrator, and apparatus of the present invention are compared weight and volume with electromagnetic type and all reduced greatly.
In addition, because servo-valve can be installed in the casing, whole box body can be sealed well, so it also can be used for underwater test.
Because compact conformation volume of the present invention is little, therefore install very conveniently, and do not need extra counter-force fulcrum, as the weight of counter force wall or suspension, significantly reduce the expense and the man-hour of ancillary test device thus, and be used for the place that existing electrohydraulic servo vibration exciting device can't be tested.
Owing to these advantages of the present invention, be specially adapted to the test of huge member aspects such as earthquake engineering, buildings, hydraulic engineering, Underwater Engineering.
The foregoing description is for the invention will be further described, and does not limit the scope of the invention.
Claims (11)
1, electrohydraulic servo vibration exciting installation, it comprises control device, by the servo-valve of control device control and the vibrator of controlling by servo-valve, vibrator is mainly by the axis of the piston, piston bush (cylinder body) is formed, be provided with two plunger shaft between piston bush and the axis of the piston, piston bush and the axis of the piston all are contained in the casing, on the casing that the axis of the piston is fixed in subjects links to each other, and piston is transportable with respect to the axis of the piston, it is characterized by: the axis of the piston is installed on the casing by force transducer in its one or both ends, and is provided with the guide piece that guarantees that piston bush moves reliably vertically.
2, according to the described electrohydraulic servo vibration exciting installation of claim 1, it is characterized by: force transducer imposes certain pretightning force when mounted, and its size need guarantee to be in stress in the course of the work all the time for sensor.
3, according to the described electrohydraulic servo vibration exciting installation of claim 1, it is characterized by, guide piece can be a guide plate, and on casing, piston bush slides on guide plate by steel ball guide plate by spring-loaded.
4, according to the described electrohydraulic servo vibration exciting installation of claim 1, it is characterized by: this guide piece is a guide rod, and piston bush holds with guide rod by bobbin and matches, and slides thereon.
5, according to the described electrohydraulic servo vibration exciting installation of claim 1, it is characterized by: servo-valve be mounted to make its valve core axis with perpendicular to the angle on the plane of the axis of the piston in ± 45 degree scopes.
6, according to claim 1,2,3,4 or 5 described electrohydraulic servo vibration exciting installations, it is characterized by: acceleration transducer, speed pickup and displacement transducer have been installed on piston bush, or have only been installed one kind of or two kinds.
7, according to claim 1,2,3,4 and 5 described electrohydraulic servo vibration exciting installations, it is characterized by: acceleration transducer, speed pickup and displacement transducer have been installed on casing, or only install one kind of or two kinds, temperature sensor also is housed in casing.
8, according to claim 1,2,3,4 or 5 described electrohydraulic servo vibration exciting installations, it is characterized by: the travel switch that is provided with the maximum displacement of control piston cover in the casing.
9, according to claim 1,2,3,4 or 5 described electrohydraulic servo vibration exciting installations, it is characterized by: on casing, be provided with gentle die head of buffering base and/or buffering lubricating pad for piston bush.
10, according to claim 1,2,3,4 or 5 described electrohydraulic servo vibration exciting installations, it is characterized by: the part that the axis of the piston matches with piston bush adopts spraying nylon spare.
11, according to the described electrohydraulic servo vibration exciting installation of claim 1, it is characterized by: on casing, be provided with and hang screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86105899.2A CN1005899B (en) | 1986-09-09 | 1986-09-09 | Electrohydraulic servo vibration exciting installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86105899.2A CN1005899B (en) | 1986-09-09 | 1986-09-09 | Electrohydraulic servo vibration exciting installation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86105899A CN86105899A (en) | 1987-06-17 |
| CN1005899B true CN1005899B (en) | 1989-11-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN86105899.2A Expired CN1005899B (en) | 1986-09-09 | 1986-09-09 | Electrohydraulic servo vibration exciting installation |
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| Country | Link |
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| CN (1) | CN1005899B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352563C (en) * | 2005-04-27 | 2007-12-05 | 西北工业大学 | Compound vibration unit and method |
| RU2447461C2 (en) * | 2009-10-08 | 2012-04-10 | Николай Викторович Беляков | Implosive downhole seismic source |
| RU2447462C2 (en) * | 2009-10-08 | 2012-04-10 | Николай Викторович Беляков | Well implosive source of seismic oscillations |
| CN102662041B (en) * | 2012-05-07 | 2015-04-01 | 中国科学院武汉岩土力学研究所 | Vibration simulation system for model experiments |
| CN107907426B (en) * | 2017-12-29 | 2024-08-09 | 中国科学院武汉岩土力学研究所 | Vibration exciter and dynamic and static triaxial test system |
-
1986
- 1986-09-09 CN CN86105899.2A patent/CN1005899B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN86105899A (en) | 1987-06-17 |
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