CN117740295A - Electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working condition and operation method thereof - Google Patents
Electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working condition and operation method thereof Download PDFInfo
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- CN117740295A CN117740295A CN202311784918.5A CN202311784918A CN117740295A CN 117740295 A CN117740295 A CN 117740295A CN 202311784918 A CN202311784918 A CN 202311784918A CN 117740295 A CN117740295 A CN 117740295A
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- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
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Abstract
The invention discloses an electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working conditions and an operation method thereof, wherein the electrohydraulic multi-degree-of-freedom vibration device comprises an open base, an elastic support column, a vibration pedestal, a hydraulic vibration generator, an electromagnetic vibration generator, a frequency detector and a connector, wherein the elastic support column comprises an inclined support column, the inclined support column is obliquely arranged, and the upper end and the lower end of the inclined support column are respectively arranged at the bottom of the vibration pedestal and the upper end of the base; the operation method comprises the following steps: the test piece is mounted on the vibration pedestal, then the electromagnetic vibration generator is started, the electromagnetic column is electrified, then the exciting coil is electrified, at the moment, the electromagnetic column can be controlled to vibrate by adjusting the current of the exciting coil, and the electromagnetic column drives the vibration pedestal to vibrate, so that the vibration pedestal reaches the preset frequency; and starting the frequency detector, starting the hydraulic cylinder, and outputting vibration by the hydraulic cylinder and driving the vibration pedestal to vibrate. The invention realizes the effect that the hydraulic vibration table has a plurality of vibration degrees of freedom under the condition of high bearing capacity.
Description
Technical Field
The invention relates to the technical field of vibration tests, and particularly discloses an electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working conditions.
Background
A vibrating table is an experimental device that is commonly used to simulate the physical phenomena of mechanical vibrations. In the prior art, an electromagnetic vibration table and a hydraulic vibration table are different in working principle, wherein the principle of the electromagnetic vibration table is to generate an alternating magnetic field in a coil through alternating current by utilizing an electromagnetic induction principle and an electromagnetic force principle, so that vibration is realized. The electromagnetic vibration table consists of a vibrator with a coil and a vibration table with a magnet. When a current is passed through the coil, a magnetic field is generated around the coil. The magnetic field around the coil generates an electric field as a result of the change in the magnetic field lines causing a movement of charges in the magnetic field. Thus, the current in the coil and the magnetic field can interact to generate an upward or downward force, so that the object on the vibration table vibrates up and down. The electromagnetic vibration table has the advantages of high precision, stable vibration and wide frequency modulation range, so that the electromagnetic vibration table is generally adopted in the prior art, and the hydraulic vibration table has the advantages of high load, high thrust, convenience in control and the like.
At present, for a vibrating table applied to the fields of earthquake and marine environment tests, a test piece in a simulation test is generally a larger sample piece, the mass of the test piece is larger, and only a hydraulic vibrating table generally has enough bearing capacity, but the vibration frequency, the frequency modulation range and the like of the hydraulic vibrating table cannot meet the requirements of some harsh test conditions, and meanwhile, the hydraulic vibrating table generally only has one vibration direction and cannot vibrate in multiple degrees of freedom.
Disclosure of Invention
In view of the above, the present invention is directed to provide an electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration conditions and an operation method thereof, so as to solve the technical problem of how to provide a hydraulic vibration table with multiple degrees of freedom under the condition of high bearing capacity.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the electrohydraulic multi-degree-of-freedom vibration device comprises an open base, an elastic support column, a vibration pedestal, a hydraulic vibration generator, an electromagnetic vibration generator, a frequency detector and a connector, wherein at least three elastic support columns are arranged, each elastic support column comprises an inclined strut, and the inclined strut is obliquely arranged, and the upper end and the lower end of the inclined strut are respectively arranged at the bottom of the vibration pedestal and the upper end of the base; the electromagnetic vibration generator comprises an electromagnetic shell, a limiting seat, an exciting coil and a non-magnetic-conductive sleeve ring, wherein the electromagnetic shell and the limiting seat are arranged on a base, the exciting coil and the non-magnetic-conductive sleeve ring are arranged inside the electromagnetic shell, the limiting seat is positioned inside the electromagnetic shell, a limiting groove is formed in the upper end of the limiting seat, and a first magnetic-conductive cylinder is arranged in the limiting groove; the bottom of the vibrating table is provided with an electromagnetic column, the electromagnetic column has magnetism after being electrified, the lower end of the electromagnetic column is vertically arranged in a first magnetic conduction cylinder of the limiting groove in a sliding manner, a first air gap is reserved between the electromagnetic column and the limiting groove, at least two non-magnetic conduction lantern rings are arranged on the upper portion and the lower portion of the electromagnetic column in a sleeved mode, the electromagnetic column is located in the exciting coil, and a second air gap is formed between the electromagnetic column and the exciting coil; the hydraulic vibration generators are arranged on two sides adjacent to the vibration pedestal respectively, each hydraulic vibration generator comprises a hydraulic cylinder, the output end of each hydraulic cylinder is connected with a connector, and each connector is connected with the side of the vibration pedestal; the frequency detector is arranged at the bottom of the vibration pedestal and comprises an acceleration sensor.
Further, the elastic support column further comprises a vertical support column, the vertical support column comprises a lower column body, an upper column body and a support spring, the upper column body is vertically arranged in the lower column body in a sliding mode, and the support spring is located in the lower column body, and the upper end and the lower end of the support spring are respectively connected with the upper column body and the lower column body.
Further, the connector comprises a pedestal connecting part and a vibration connecting part, wherein the pedestal connecting part is detachably arranged on the side surface of the vibration pedestal, at least three elliptical connecting holes are horizontally arranged on the pedestal connecting part, a plurality of blind holes are formed in the inner wall of each connecting hole, a protection spring is arranged in each blind hole, and a protection rod is arranged on each protection spring; the vibration connecting portion is hinged to the output end of the hydraulic cylinder, three connecting columns are arranged on the vibration connecting portion, the connecting columns are movably arranged in the connecting holes, and the protection rod is in universal connection with the outer wall of the connecting columns.
Further, the protection rods are uniformly arranged along the circumferential direction of the inner wall of the connecting hole.
Further, the pedestal connection portion is fixedly provided on a side surface of the vibration pedestal by a bolt, and the pedestal connection portion is detachable from the vibration pedestal.
Further, the elastic support column further comprises an elastic end, a first plane and a first inclined plane are formed at the bottom of the elastic end, threaded holes are formed in the first plane and the first inclined plane, the upper end of the vertical support column is arranged in the first plane threaded hole, and the upper end of the inclined support column is arranged in the first inclined plane threaded hole.
The invention provides an operation method of an electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working conditions, which comprises the following steps:
s1, selecting upright posts with different loading ranges according to different test piece masses, taking out the upper ends of the upright posts from threaded holes of a first plane when replacing the upright posts, and detaching the lower ends of the upright posts to replace the upright posts;
s2, mounting a test piece on a vibration pedestal, starting an electromagnetic vibration generator, electrifying an electromagnetic column, electrifying an exciting coil, adjusting the current of the exciting coil at the moment to control the electromagnetic column to vibrate, and driving the vibration pedestal to vibrate by the electromagnetic column to enable the vibration pedestal to reach a preset frequency P1;
s4, starting a frequency detector, detecting the actual frequency P2 of the vibration pedestal, comparing the detected actual frequency P2 with the output frequency P3, and then adjusting the output frequency P3 to enable the output frequency P3 to be identical with the preset frequency P1;
and S5, starting the hydraulic cylinder, and outputting vibration by the hydraulic cylinder and driving the vibration pedestal to vibrate.
The beneficial effects of the invention are as follows.
In the invention, the elastic support column is firstly arranged, and the elastic support column is used for supporting the vibration pedestal, and comprises a vertical support column and an inclined support column, and the two can adopt a spring damper structure. Wherein, the upright post can support from vertical direction, plays main supporting role, and the diagonal brace is then used for supporting from the incline direction, and both roles are not only supporting, still need to play the effect that resets to vibrating the pedestal and to vibrating the pedestal auxiliary vibration effect. The bearing capacity of the elastic support column is very good, but the defects are obvious, the vibration output of the electromagnetic vibration generator and the hydraulic vibration generator can be influenced, the difference between the output vibration frequency and the actual vibration frequency can be influenced, and particularly, the vertical direction is vertical, because the electromagnetic vibration generator is adopted in the vertical direction, the output force is relatively weak, meanwhile, the output frequency is high, the influence is easier to be caused, and the hydraulic vibration generator is adopted in the horizontal direction, the output force of the hydraulic cylinder is large, and the influence is relatively small; this problem is solved in the present invention in other ways.
In the invention, the frequency detector is arranged on the vibration pedestal, and can detect the vibration frequency in the vertical direction, a test piece is placed on the vibration pedestal at the beginning of the test, and only the electromagnetic vibration generator is started and then the frequency detection is carried out, so that the frequency calibration is carried out, and the actual frequency P2 is the same as the preset frequency P1. The operation of the invention is more complex than the prior art, but the device is used for detecting the laboratory rather than the industrial products, and the operation in the laboratory is not too much workload, and the advantages are more remarkable than the disadvantages.
In the invention, the base adopts an open type setting mode, the open type setting mode is not attractive, but laboratory equipment is not required to be attractive, and particularly, the radiating effect is good, heat generated when the electromagnetic column moves can be consumed more quickly, and the service life of the equipment is prolonged.
The invention is provided with the limit seat, the limit seat is internally provided with the first magnetic conduction cylinder, the first magnetic conduction cylinder in the prior art basically covers and surrounds the whole electromagnetic column, so that the defects of large heat generation and slow heat dissipation are caused, the first magnetic conduction cylinder only surrounds the lower part of the electromagnetic column, and the rest part adopts the non-magnetic conduction sleeve ring for limit, so that the effect of stabilizing the electromagnetic column can be achieved.
The invention is also provided with a connector for connecting the hydraulic cylinder and the vibrating table-base. In the large-bearing test, the vibration displacement distance in the vertical direction is generally smaller, the vibration displacement distance in the horizontal direction is relatively larger, and in order to simulate wider vibration frequency, the hydraulic vibration generator is adopted as a driving mode of horizontal vibration, so that the driving force is larger and more stable, and the vibration displacement distance can also be longer. The connector is used for solving the problem that vertical vibration and horizontal vibration are mutually influenced. The vertical vibration has the characteristics of high frequency and small displacement, and the horizontal vibration has the characteristics of low frequency and large displacement, so that the connecting hole is formed in the pedestal connecting part, the connecting column is arranged on the vibration connecting part and is fixedly connected with the inner vertical wall of the connecting hole to keep a certain distance with the side wall, and the connecting column has a certain movable range to avoid the influence of the vertical vibration.
The structure of blind holes and protective columns is also arranged in the connecting holes, and the protective columns play a role in buffering, so that the influence on test results caused by the fact that the connecting columns are subjected to vibration and then generate displacement which is horizontal and vertical to the output end of the hydraulic cylinder is avoided. Meanwhile, the connecting column is in universal connection with the inner wall of the connecting hole, so that the connecting column can conveniently move in the connecting hole, a certain degree of freedom of movement is given to the connecting column, and bending damage caused by excessive vibration and rigidity of the connecting column is avoided.
Drawings
FIG. 1 is a schematic diagram of an electrohydraulic multi-degree-of-freedom vibration device for simulating high and low frequency transportation vibration conditions in an embodiment;
FIG. 2 is a schematic structural view of an elastomeric support column;
FIG. 3 is a schematic structural view of a connector;
fig. 4 is a schematic view of the structure of the inside of the pedestal connection portion;
fig. 5 is a schematic view of the structure of the inside of the electromagnetic vibration generator.
The figures are marked as follows: base 1, stand post 2, diagonal brace 3, elasticity end 4, pneumatic cylinder 5, connector 6, solenoid shell 7, spliced pole 8, screw 9, vibration connecting portion 10, pedestal connecting portion 11, connecting portion 12, blind hole 13, protection spring 14, protection pole 15, first magnetic conduction section of thick bamboo 16, solenoid 17, first air gap 18, non-magnetic conduction lantern ring 19, exciting coil 20, second air gap 21, spacing seat 22.
Detailed Description
The following is a further detailed description of the embodiments:
examples
An electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working conditions is shown in fig. 1-5, and comprises an open base 1, an elastic support column, a vibration pedestal, a hydraulic vibration generator, an electromagnetic vibration generator, a frequency detector and a connector 6.
The base 1 is located the below, and the elastic support column sets up on base 1, and the lower extreme of vibration pedestal sets up on the elastic support column, and electromagnetic vibration generator sets up on base 1 and is used for the vibration output of vibration pedestal vertical direction, and fluid pressure type vibration generator also sets up on base 1 and is used for the vibration output of vibration pedestal's horizontal direction, and frequency detector then sets up on the vibration pedestal.
The elastic support column sets up three at least, and the elastic support column includes elastic end 4, upright post 2 and diagonal brace 3, and upright post 2 includes down the cylinder, goes up cylinder and supporting spring, and down the cylinder is fixed to be set up on base 1, goes up the vertical slip setting of cylinder and in down the cylinder, and supporting spring is located down the cylinder and goes up the lower extreme and be connected with last cylinder and lower cylinder respectively. The diagonal brace 3 is obliquely arranged and the upper and lower ends thereof are respectively arranged at the bottom of the vibration pedestal and the upper end of the base 1. The diagonal strut 3 may also be of a spring damper construction. The bottom of the elastic end 4 is provided with a first plane and a first inclined plane, threaded holes are formed in the first plane and the first inclined plane, the upper end of the upright post 2 is provided with a threaded part 9 and is arranged in the threaded hole of the first plane, and the upper end of the inclined post 3 is provided with a threaded part 9 and is arranged in the threaded hole of the first inclined plane. The upper end of the elastic end head 4 is fixedly arranged at the lower end of the vibration pedestal through a bolt.
The electromagnetic vibration generator comprises an electromagnetic shell 7, a limiting seat 22, an exciting coil 20 and a non-magnetic-conductive sleeve ring 19. The electromagnetic shell 7 and the limit seat 22 are arranged on the base 1, the exciting coil 20 and the non-magnetic-conductive lantern ring 19 are arranged inside the electromagnetic shell 7, and the limit seat 22 is positioned inside the electromagnetic shell 7 and the upper end of the limit seat is provided with a limit groove. The first magnetic conduction cylinder 16 is arranged in the limiting groove, the electromagnetic column 17 is arranged at the bottom of the vibrating table, the electromagnetic column 17 is magnetic after being electrified, the lower end of the electromagnetic column 17 is vertically and slidably arranged in the first magnetic conduction cylinder 16 of the limiting groove, and a first air gap 18 is reserved between the electromagnetic column 17 and the limiting groove. The non-magnetic collar 19 is provided with at least two and is sleeved on the upper and lower parts of the electromagnetic column 17, the electromagnetic column 17 is positioned inside the exciting coil 20, and a second air gap 21 is formed between the electromagnetic column 17 and the exciting coil 20.
The hydraulic vibration generator is provided with two and is located two adjacent sides of vibration pedestal respectively, and the hydraulic vibration generator includes pneumatic cylinder 5, the output of pneumatic cylinder 5 is connected with connector 6, and connector 6 is connected with the side of vibration pedestal. The connector 6 includes pedestal connection portion 11 and vibration connection portion 10, and pedestal connection portion 11 passes through the bolt and can dismantle the side that sets up at vibration pedestal, and the level is provided with at least three connecting hole 12 that are oval form on the pedestal connection portion 11, is provided with a plurality of blind holes 13 on the inner wall of connecting hole 12, and blind hole 13 radially set up along connecting hole 12 inner wall, is provided with protection spring 14 in the blind hole 13, is provided with protection pole 15 on the protection spring 14, and protection pole 15 evenly arranges along connecting hole 12's inner wall circumference. The vibration connecting portion 10 is hinged to the output end of the hydraulic cylinder 5, three connecting columns 8 are arranged on the vibration connecting portion 10, the connecting columns 8 are movably arranged in the connecting holes 12, and the protection rod 15 is in universal connection with the outer wall of the connecting columns 8. The connection mode of the connecting column 8 and the connecting hole 12 is as follows: one end of the connecting column 8 close to the connecting hole 12 is connected with the vertical inner wall of the connecting hole 12 in a universal way.
The frequency detector is arranged at the bottom of the vibration table seat and comprises an acceleration sensor.
An operation method of an electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration conditions comprises the following steps:
s1, selecting upright posts 2 with different loading ranges according to different test piece masses, taking out the upper ends of the upright posts 2 from threaded holes of a first plane when replacing the upright posts 2, and detaching the lower ends of the upright posts to replace the upright posts;
s2, mounting a test piece on a vibration pedestal, starting an electromagnetic vibration generator, electrifying an electromagnetic column 17, electrifying an exciting coil 20, adjusting the current of the exciting coil 20 at the moment to control the electromagnetic column 17 to vibrate, and driving the vibration pedestal to vibrate by the electromagnetic column 17 to enable the vibration pedestal to reach a preset frequency P1;
s4, starting a frequency detector, detecting the actual frequency P2 of the vibration pedestal, comparing the detected actual frequency P2 with the output frequency P3, and then adjusting the output frequency P3 to enable the output frequency P3 to be identical with the preset frequency P1;
and S5, starting the hydraulic cylinder 5, and outputting vibration by the hydraulic cylinder 5 and driving the vibration pedestal to vibrate.
Claims (7)
1. An electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working conditions is characterized in that: the vibration device comprises an open base, an elastic support column, a vibration pedestal, a hydraulic vibration generator, an electromagnetic vibration generator, a frequency detector and a connector, wherein at least three elastic support columns are arranged, each elastic support column comprises an inclined support column, and the inclined support columns are obliquely arranged and the upper ends and the lower ends of the inclined support columns are respectively arranged at the bottom of the vibration pedestal and the upper end of the base; the electromagnetic vibration generator comprises an electromagnetic shell, a limiting seat, an exciting coil and a non-magnetic-conductive sleeve ring, wherein the electromagnetic shell and the limiting seat are arranged on a base, the exciting coil and the non-magnetic-conductive sleeve ring are arranged inside the electromagnetic shell, the limiting seat is positioned inside the electromagnetic shell, a limiting groove is formed in the upper end of the limiting seat, and a first magnetic-conductive cylinder is arranged in the limiting groove; the bottom of the vibrating table is provided with an electromagnetic column, the electromagnetic column has magnetism after being electrified, the lower end of the electromagnetic column is vertically arranged in a first magnetic conduction cylinder of the limiting groove in a sliding manner, a first air gap is reserved between the electromagnetic column and the limiting groove, at least two non-magnetic conduction lantern rings are arranged on the upper portion and the lower portion of the electromagnetic column in a sleeved mode, the electromagnetic column is located in the exciting coil, and a second air gap is formed between the electromagnetic column and the exciting coil; the hydraulic vibration generators are arranged on two sides adjacent to the vibration pedestal respectively, each hydraulic vibration generator comprises a hydraulic cylinder, the output end of each hydraulic cylinder is connected with a connector, and each connector is connected with the side of the vibration pedestal; the frequency detector is arranged at the bottom of the vibration pedestal and comprises an acceleration sensor.
2. The electrohydraulic multi-degree-of-freedom vibration device for simulating high and low frequency transportation vibration conditions according to claim 1, wherein: the elastic support column further comprises a vertical support column, the vertical support column comprises a lower column body, an upper column body and a support spring, the upper column body is vertically arranged in the lower column body in a sliding mode, and the support spring is located in the lower column body, and the upper end and the lower end of the support spring are respectively connected with the upper column body and the lower column body.
3. The electrohydraulic multi-degree-of-freedom vibration device for simulating high and low frequency transportation vibration conditions according to claim 2, wherein: the connector comprises a pedestal connecting part and a vibration connecting part, wherein the pedestal connecting part is detachably arranged on the side surface of the vibration pedestal, at least three elliptical connecting holes are horizontally arranged on the pedestal connecting part, a plurality of blind holes are formed in the inner wall of each connecting hole, a protection spring is arranged in each blind hole, and a protection rod is arranged on each protection spring; the vibration connecting portion is hinged to the output end of the hydraulic cylinder, three connecting columns are arranged on the vibration connecting portion, the connecting columns are movably arranged in the connecting holes, and the protection rod is in universal connection with the outer wall of the connecting columns.
4. The electrohydraulic multi-degree-of-freedom vibration device for simulating a vibration condition of high and low frequency transportation according to claim 3, wherein: the protection rods are uniformly arranged along the circumferential direction of the inner wall of the connecting hole.
5. The electrohydraulic multi-degree-of-freedom vibration device for simulating high and low frequency transportation vibration conditions of claim 4, wherein: the pedestal connection portion is fixedly arranged on the side face of the vibration pedestal through bolts, and the pedestal connection portion can be detached from the vibration pedestal.
6. The electrohydraulic multi-degree of freedom vibration device for simulating a vibration condition of high and low frequency transportation according to claim 5, wherein: the elastic support column further comprises an elastic end, a first plane and a first inclined plane are formed at the bottom of the elastic end, threaded holes are formed in the first plane and the first inclined plane, the upper end of the vertical support column is arranged in the first plane threaded hole, and the upper end of the inclined support column is arranged in the first inclined plane threaded hole.
7. A method of operating the electro-hydraulic multiple degree of freedom vibration apparatus of claim 6 wherein the steps include:
s1, selecting stand columns with different loading ranges according to different test piece masses, taking out the upper ends of the stand columns from threaded holes of a first plane when the stand columns are replaced, and removing the lower ends of the stand columns for replacement;
s2, mounting a test piece on a vibration pedestal, starting an electromagnetic vibration generator, electrifying an electromagnetic column, electrifying an exciting coil, adjusting the current of the exciting coil at the moment to control the electromagnetic column to vibrate, and driving the vibration pedestal to vibrate by the electromagnetic column to enable the vibration pedestal to reach a preset frequency P1;
s4, starting a frequency detector, detecting the actual frequency P2 of the vibration pedestal, comparing the detected actual frequency P2 with the output frequency P3, and then adjusting the output frequency P3 to enable the output frequency P3 to be identical with the preset frequency P1;
and S5, starting the hydraulic cylinder, and outputting vibration by the hydraulic cylinder and driving the vibration pedestal to vibrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311784918.5A CN117740295A (en) | 2023-12-24 | 2023-12-24 | Electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working condition and operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311784918.5A CN117740295A (en) | 2023-12-24 | 2023-12-24 | Electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working condition and operation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN117740295A true CN117740295A (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311784918.5A Pending CN117740295A (en) | 2023-12-24 | 2023-12-24 | Electrohydraulic multi-degree-of-freedom vibration device for simulating high-low frequency transportation vibration working condition and operation method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN117740295A (en) |
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2023
- 2023-12-24 CN CN202311784918.5A patent/CN117740295A/en active Pending
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