CN106644343B - Rotary vibration table and system thereof - Google Patents
Rotary vibration table and system thereof Download PDFInfo
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- CN106644343B CN106644343B CN201710119871.9A CN201710119871A CN106644343B CN 106644343 B CN106644343 B CN 106644343B CN 201710119871 A CN201710119871 A CN 201710119871A CN 106644343 B CN106644343 B CN 106644343B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
Abstract
The invention relates to the technical field of measurement and calibration equipment, in particular to a rotary vibration table and a system thereof. The rotary vibration table comprises a base, a supporting shaft and a rotary table; the supporting shaft is connected with the base and the rotating table, and the rotating table can rotate around the axis of the supporting shaft relative to the base; a driving coil and a feedback coil are arranged between the base and the rotating table; the driving coil and the feedback coil are arranged on two sides of the supporting shaft and are respectively and fixedly connected with the rotating table; the base is fixedly connected with a driving magnetic circuit and a feedback magnetic circuit; the driving coil can rotate around the axis of the supporting shaft in a reciprocating mode in the driving magnetic circuit, and the feedback coil can rotate around the axis of the supporting shaft in a reciprocating mode in the feedback magnetic circuit. The rotary vibration system comprises the rotary vibration table. The invention aims to provide a rotary vibration table and a system thereof, which aim to solve the technical problems of high price, higher minimum measurement frequency and small bearing capacity of the vibration table in the prior art.
Description
Technical Field
The invention relates to the technical field of measurement and calibration equipment, in particular to a rotary vibration table and a system thereof.
Background
At present, angular vibration tables driven by torque motors are adopted at home and abroad, and the measurement principle generally adopts one-time calibration by a laser interferometry, wherein the frequency range is 5Hz-500Hz; but the vibration table is expensive and the minimum measurement frequency is higher. In addition, the bearing capacity of the current angular vibration table is generally less than 10kg, and the current angular vibration table can only be used for calibrating a common angular vibration sensor and cannot be used for calibrating a seismic rotation sensor with a larger volume and a torsional vibration resistance test of a small-scale structure.
Therefore, a relatively low-price, low-lowest measurement frequency and high-bearing-capacity rotary vibration table and a system thereof are urgently needed, so that the rotary vibration table and the system thereof can be used for calibrating anti-torsion vibration tests of seismic rotation sensors and small-scale structures.
Disclosure of Invention
The invention aims to provide a rotary vibration table to solve the technical problems of high price, high lowest measurement frequency and small bearing capacity of the vibration table in the prior art.
The invention also aims to provide a rotary vibration system to solve the technical problems of high price, high lowest measurement frequency and small bearing capacity of the vibration table in the prior art.
In view of the first object, the present invention provides a rotary vibration table, which comprises a base, a support shaft and a rotary table; the supporting shaft is connected with the base and the rotating table, and the rotating table can rotate around the axis of the supporting shaft relative to the base;
a driving coil and a feedback coil are arranged between the base and the rotating table; the driving coil and the feedback coil are arranged on two sides of the supporting shaft and are respectively and fixedly connected with the rotating table;
the base is fixedly connected with a driving magnetic circuit and a feedback magnetic circuit; the driving coil can rotate around the axis of the supporting shaft in a reciprocating mode in the driving magnetic circuit, and the feedback coil can rotate around the axis of the supporting shaft in a reciprocating mode in the feedback magnetic circuit.
Further, the driving magnetic circuit includes a first driving magnetizer, a second driving magnetizer and a driving permanent magnet; the first driving magnetizer and the second driving magnetizer are sequentially arranged at intervals along the axial direction of the supporting shaft, and the second driving magnetizer is fixedly connected with the base;
the first end of the first driving magnetizer and the first end of the second driving magnetizer are respectively arranged at intervals with the driving coil; and the second end corresponding to the first driving magnetizer and the second end corresponding to the second driving magnetizer are respectively and fixedly connected with the driving permanent magnet.
Further, the feedback magnetic circuit comprises a first feedback magnetizer, a second feedback magnetizer and a feedback permanent magnet; the first feedback magnetizer and the second feedback magnetizer are sequentially arranged at intervals along the axial direction of the support shaft, and the second feedback magnetizer is fixedly connected with the base;
the first end of the first feedback magnetizer and the first end of the second feedback magnetizer are respectively arranged at intervals with the feedback coil; and the second end corresponding to the first feedback magnetizer and the second end corresponding to the second feedback magnetizer are respectively and fixedly connected with the feedback permanent magnet.
Further, along the axial direction of the support shaft, one ends of the first and second drive magnetizers, which are close to the drive coil, are respectively provided with a drive yoke, and one ends of the first and second feedback magnetizers, which are close to the feedback coil, are respectively provided with a feedback yoke;
the second driving magnetizer is fixedly connected with the base through a driving magnetic circuit seat;
the second feedback magnetizer is fixedly connected with the base through a feedback magnetic circuit seat.
Further, along the axial direction of the support shaft, the drive coil, the first drive magnetizer, the second drive magnetizer and the drive permanent magnet are respectively in fan-ring shapes with the circle centers on the axis of the support shaft, and the feedback coil, the first feedback magnetizer, the second feedback magnetizer and the feedback permanent magnet are respectively in fan-ring shapes with the circle centers on the axis of the support shaft.
Further, the driving coil and the feedback coil are symmetrically arranged on two sides of the supporting shaft, and the driving magnetic circuit and the feedback magnetic circuit are symmetrically arranged on two sides of the supporting shaft.
Furthermore, the supporting shaft is fixedly connected with the base, and a bearing is arranged between the supporting shaft and the rotating table;
a reset device for resetting the rotating table is arranged between the supporting shaft and the rotating table; the reset device comprises an elastic sheet or a spring.
Furthermore, the rotating table comprises a table body and two coil connecting pieces fixedly connected with the table body;
the two coil connecting pieces are arranged on two sides of the supporting shaft and are respectively and fixedly connected with the driving coil and the feedback coil;
one end of the elastic sheet or the spring is fixedly connected with the coil connecting piece, and the other end of the elastic sheet or the spring is connected with the supporting shaft.
Furthermore, the rotary vibration table also comprises a shell; the shell is sleeved on the base and forms a shell cavity with the base;
the shell is provided with a groove corresponding to the rotating table, and the table surface of the rotating table protrudes out of the shell;
the support shaft, the drive coil, the feedback coil, the drive magnetic circuit and the feedback magnetic circuit are all arranged in the shell cavity.
Based on the second object, the invention provides a rotary vibration system, which comprises the rotary vibration table;
a limiting groove is formed in the table surface of the rotating table of the rotating vibration table; the shell is provided with a locking limiting device corresponding to the limiting groove; the locking piece of the locking and limiting device can be inserted into the limiting groove;
the shell is provided with a dial corresponding to the rotating table.
The rotary vibration table provided by the invention comprises a base, a support shaft, a rotary table, a driving coil and a feedback coil, and is simple in structure, convenient to produce and process and relatively low in price; the rotating table is supported and connected through the supporting shaft so as to improve the bearing capacity of the rotating vibrating table, so that the rotating vibrating table can be used for calibration of a large-size earthquake rotating sensor and an anti-torsion vibration test of a small-scale structure; through the drive coil in the drive magnetic circuit around the axis reciprocating rotation of back shaft to and the feedback coil in the feedback magnetic circuit around the axis reciprocating rotation of back shaft, with improve the damping ratio who rotates the shaking table through the twin coil, thereby expand the low frequency characteristic that rotates the shaking table, and then reduce the minimum measuring frequency who rotates the shaking table.
The rotary vibration system comprises the rotary vibration table, and has the advantages of simple structure, convenience in production and processing, relatively low price, high bearing capacity, low minimum measurement frequency and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a first angular cross-sectional view of a rotary vibration table according to one embodiment of the present invention;
fig. 2 is a schematic view of a second angular structure of a rotary vibration table according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a driving coil and a feedback coil of a rotary vibration table according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a driving permanent magnet and a feedback permanent magnet of a rotary vibration table according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a driving magnetic circuit and a feedback magnetic circuit of a rotary vibration table according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a drive coil or a feedback coil of a rotary vibration table according to one embodiment of the present invention (only the drive coil is shown in the figure);
fig. 7 is a cross-sectional view of a driving magnetic circuit or a feedback magnetic circuit of a rotary vibration table according to an embodiment of the present invention (only the reference numbers of the driving magnetic circuit are shown in the figure);
fig. 8 is a schematic circuit connection diagram of a rotary vibration table according to an embodiment of the present invention.
An icon: 1-supporting a shaft; 2-a bearing; 3-rotating the platform; 31-a table body; 32-coil connectors; 33-a limiting groove; 5-a feedback coil; 6-a first feedback magnetizer; 7-a feedback permanent magnet; 8-driving coils; 9-a first drive conductor; 91-a drive yoke; 10-a cover plate; 11-a side wall; 12-cover plate fastening screws; 13-driving permanent magnets; 14-a drive magnetic circuit; 15-driving the magnetic circuit base; 16-a base; 17-a second drive magnet conductor; 19-a resetting device; 20-a second feedback conductor; 21-feedback magnetic circuit base; 22-a feedback magnetic circuit; 23-locking a limiting device; 24-a dial; 101-a signal source; 102-an adder; 103-a power amplifier; 104-a feedback amplifier; 105-an integrator; 106-follower.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 1 to 8, the present embodiment provides a rotary vibration table; FIG. 1 is a first angular cross-sectional view (cross-sectional view not shown) of the rotary vibration table provided in the present embodiment; fig. 2 is a schematic view of a second angular structure of the rotary vibration table provided in this embodiment; fig. 3 is a schematic structural diagram of a driving coil and a feedback coil of the rotary vibration table provided in this embodiment; fig. 4 is a schematic structural diagram of a driving permanent magnet and a feedback permanent magnet of the rotary vibration table provided in this embodiment; fig. 5 is a schematic structural diagram of a driving magnetic circuit and a feedback magnetic circuit of the rotary vibration table provided in the present embodiment; fig. 6 is a cross-sectional view of the driving coil or the feedback coil of the rotary vibration table according to the present embodiment (only the reference numeral of the driving coil is shown in the figure); fig. 7 is a cross-sectional view of a driving magnetic circuit or a feedback magnetic circuit of the rotary vibration table provided in the present embodiment (only reference numerals of the driving magnetic circuit are shown in the figure); fig. 8 is a schematic circuit connection diagram of the rotary vibration table provided in this embodiment.
Referring to fig. 1 to 7, the present embodiment provides a rotary vibration table, which includes a base 16, a support shaft 1, and a rotary table 3; the support shaft 1 connects the base 16 and the turn table 3, and the turn table 3 is rotatable about the axis of the support shaft 1 with respect to the base 16. Alternatively, the turntable 3 is fixedly connected with the support shaft 1, and the support shaft 1 is rotatably connected with the base 16, so that the turntable 3 can rotate relative to the base 16. Alternatively, the rotating table 3 is rotatably connected with the supporting shaft 1, and the supporting shaft 1 is fixedly connected with the base 16, so that the rotating table 3 can rotate relative to the base 16; further, a bearing 2 is arranged between the supporting shaft 1 and the rotating table 3; that is, the rotating table 3 can rotate around the axis of the supporting shaft 1 relative to the supporting shaft 1 through the bearing 2; the bearing 2 is arranged to further improve the bearing capacity of the rotary vibration table. Optionally, the bearing 2 is a precision bearing with a large axial load, and the support shaft 1 is a support shaft with a large axial load; the bearing capacity of the rotary vibration table is improved by matching the support shaft 1 with the bearing 2. Preferably, the axis of the supporting shaft 1 is collinear with the axis of the rotating table 3 to improve the measurement accuracy of the rotating oscillating table.
A driving coil 8 and a feedback coil 5 are arranged between the base 16 and the rotating table 3; the driving coil 8 and the feedback coil 5 are arranged on both sides of the supporting shaft 1, and the driving coil 8 and the feedback coil 5 are respectively fixedly connected with the rotating table 3.
The base 16 is fixedly connected with a driving magnetic circuit 14 and a feedback magnetic circuit 22; the driving coil 8 is capable of reciprocating rotation about the axis of the support shaft 1 within the driving magnetic circuit 14, and the feedback coil 5 is capable of reciprocating rotation about the axis of the support shaft 1 within the feedback magnetic circuit 22. Alternatively, the driving magnetic circuit 14 and the feedback magnetic circuit 22 are disposed on both sides of the supporting shaft 1, so that the driving coil 8 and the feedback coil 5 can rotate better in the driving magnetic circuit 14 and the feedback magnetic circuit 22.
The rotary vibration table in the embodiment comprises a base 16, a support shaft 1, a rotary table 3, a driving coil 8 and a feedback coil 5, and is simple in structure, convenient to produce and process and relatively low in price; the rotating table 3 is supported and connected through the supporting shaft 1 to improve the bearing capacity of the rotating vibration table, so that the rotating vibration table can be used for calibration of a large-size earthquake rotation sensor and an anti-torsion vibration test of a small-scale structure; the driving coil 8 rotates in a reciprocating mode around the axis of the supporting shaft 1 in the driving magnetic circuit 14, and the feedback coil 5 rotates in a reciprocating mode around the axis of the supporting shaft 1 in the feedback magnetic circuit 22, so that the damping ratio of the rotary vibration table is improved through the double coils, the low-frequency characteristic of the rotary vibration table is expanded, and the minimum measuring frequency of the rotary vibration table is reduced.
In an alternative of this embodiment, the drive magnetic circuit 14 comprises a first drive magnetizer 9, a second drive magnetizer 17 and a drive permanent magnet 13; the first drive magnetizer 9 and the second drive magnetizer 17 are sequentially arranged at intervals along the axial direction of the support shaft 1, and the second drive magnetizer 17 is fixedly connected with the base 16.
The first end of the first driving magnetizer 9 and the first end of the second driving magnetizer 17 are respectively arranged at intervals with the driving coil 8, that is, the driving coil 8 rotates back and forth around the axis of the supporting shaft 1 in the magnetic gap formed between the first end of the first driving magnetizer 9 and the first end of the second driving magnetizer 17; a second end corresponding to the first driving magnetizer 9 and a second end corresponding to the second driving magnetizer 17 are respectively and fixedly connected with the driving permanent magnet 13. The first drive magnetizer 9, the second drive magnetizer 17 and the drive permanent magnet 13 are used for increasing the measurement range of the rotation of the drive coil 8, thereby improving the measurement range of the angular displacement of the rotary vibration table.
In an alternative of this embodiment, feedback magnetic circuit 22 includes first feedback magnetizer 6, second feedback magnetizer 20, and feedback permanent magnet 7; the first feedback magnetizer 6 and the second feedback magnetizer 20 are sequentially arranged at intervals along the axial direction of the support shaft 1, and the second feedback magnetizer 20 is fixedly connected with the base 16.
The first end of the first feedback magnetizer 6 and the first end of the second feedback magnetizer 20 are respectively arranged at intervals with the feedback coil 5, that is, the feedback coil 5 rotates in a reciprocating manner around the axis of the support shaft 1 in the magnetic gap formed between the first end of the first feedback magnetizer 6 and the first end of the second feedback magnetizer 20; a second end corresponding to the first feedback magnetizer 6 and a second end corresponding to the second feedback magnetizer 20 are respectively fixedly connected to the feedback permanent magnet 7. The measuring range of the rotation of the feedback coil 5 is increased through the first feedback magnetizer 6, the second feedback magnetizer 20 and the feedback permanent magnet 7, and the measuring range of the rotation vibration table for measuring the angular displacement is further improved.
In an alternative of this embodiment, along the axial direction of the support shaft 1, the ends of the first and second drive magnetizers 9 and 17 close to the drive coil 8 are respectively provided with a drive yoke 91, and the drive yoke 91 protrudes from the surface of the first or second drive magnetizer 9 or 17, as shown in fig. 7; that is, the driving coil 8 is reciprocally rotated about the axis of the support shaft 1 in the magnetic gap formed between the driving yoke 91 of the first driving magnetizer 9 and the driving yoke 91 of the second driving magnetizer 17. The magnetic lines of force of the driving permanent magnet 13 in the magnetic gap between the first driving magnetizer 9 and the second driving magnetizer 17 are enhanced by the driving yoke 91, so that the driving coil 8 moves in the magnetic gap of the driving magnetic circuit 14 to cut the magnetic lines of force to generate a strong induced electromotive force.
Optionally, along the axial direction of the support shaft 1, one ends of the first feedback magnetizer 6 and the second feedback magnetizer 20 close to the feedback coil 5 are respectively provided with a feedback yoke (not labeled in the figure), and the feedback yokes protrude out of the surface of the first feedback magnetizer 6 or the second feedback magnetizer 20; that is, the feedback coil 5 is reciprocally rotated about the axis of the support shaft 1 in the magnetic gap formed between the feedback yoke of the first feedback magnetic conductor 6 and the feedback yoke of the second feedback magnetic conductor 20. The magnetic force lines of the feedback permanent magnet 7 in the magnetic gap between the first feedback magnetizer 6 and the second feedback magnetizer 20 are enhanced through the feedback magnetic yoke, so that the feedback coil 5 moves in the magnetic gap of the feedback magnetic circuit 22 to cut the magnetic force lines to generate stronger induced electromotive force.
Optionally, the second driving magnetizer 17 is fixedly connected with the base 16 through the driving magnetic circuit seat 15; the second driving magnetizer 17 is firmly fixed on the base 16 through the driving magnetic circuit seat 15, and the driving magnetic circuit 14 is firmly fixed on the base 16; furthermore, the height of the drive magnetic circuit seat 15 is adjusted to make the drive magnetic circuit 14 better fit with the drive coil 8.
Optionally, the second feedback magnetic conductor 20 is fixedly connected to the base 16 through a feedback magnetic circuit seat 21. The second feedback magnetizer 20 is firmly fixed on the base 16 through the feedback magnetic circuit seat 21, and the feedback magnetic circuit 22 is firmly fixed on the base 16; furthermore, feedback magnetic circuit 22 is better fitted with feedback coil 5 by adjusting the height of feedback magnetic circuit seat 21.
In an alternative scheme of the embodiment, along the axial direction of the support shaft 1, the drive coil 8, the first drive magnetizer 9, the second drive magnetizer 17 and the drive permanent magnet 13 are respectively in fan-ring shapes with the circle centers on the axis of the support shaft 1; so as to increase the measuring range of the rotation of the driving coil 8 and further improve the measuring range of the angular displacement of the rotary vibration table. Along the axial direction of the support shaft 1, the feedback coil 5, the first feedback magnetizer 6, the second feedback magnetizer 20 and the feedback permanent magnet 7 are respectively in fan-ring shapes with the circle centers on the axis of the support shaft 1; so as to increase the measuring range of the rotation of the feedback coil 5 and further improve the measuring range of the angular displacement of the rotary vibration table.
Optionally, the central angles of the first driving magnetizer 9, the second driving magnetizer 17 and the driving permanent magnet 13 are the same; the central angles of the first feedback magnetizer 6, the second feedback magnetizer 20 and the feedback permanent magnet 7 are the same. Along the axial direction of the support shaft 1, the cross-sectional areas of the first drive magnetizer 9 and the second drive magnetizer 17 are the same, and the cross-sectional areas of the first feedback magnetizer 6 and the second feedback magnetizer 20 are the same.
In an alternative of this embodiment, the driving coil 8 and the feedback coil 5 are symmetrically disposed on both sides of the supporting shaft 1, and the driving magnetic circuit 14 and the feedback magnetic circuit 22 are symmetrically disposed on both sides of the supporting shaft 1, so as to simplify the structure of the rotary vibration table, facilitate calculation of the measurement angle of the rotary vibration table, and improve the measurement accuracy of the rotary vibration table.
In an alternative of the present embodiment, a resetting device 19 for resetting the rotating table 3 is provided between the supporting shaft 1 and the rotating table 3; the return means 19 comprise a resilient plate or spring. Through resetting means 19 to accomplish after the tests such as anti-twist vibration to calibration earthquake rotation sensor, small scale structure, the revolving stage 3 that rotates the shaking table can automatic re-setting, in order to improve the automated performance who rotates the shaking table.
In an alternative of this embodiment, the rotating table 3 comprises a table body 31 and two coil connecting members 32 fixedly connected to the table body 31.
Two coil connectors 32 are arranged on two sides of the supporting shaft 1 and are respectively fixedly connected with the driving coil 8 and the feedback coil 5; alternatively, two coil connectors 32 are symmetrically disposed at both sides of the support shaft 1. Fixedly connecting the driving coil 8 and the feedback coil 5 on the table body 31 through the coil connecting piece 32, so that the driving coil 8 and the feedback coil 5 rotate along with the rotation of the table body 31; furthermore, feedback magnetic circuit 22 is better fitted with feedback coil 5 by adjusting the height of coil connector 32 so that drive magnetic circuit 14 is better fitted with drive coil 8.
One end of the elastic sheet or the spring is fixedly connected with the coil connecting piece 32, and the other end is connected with the supporting shaft 1. Optionally, the number of the elastic pieces or springs is two, and the two groups of elastic pieces or springs are symmetrically arranged on two sides of the supporting shaft 1; each set of resilient tabs comprises one or more resilient tabs, or each set of springs comprises one or more springs.
In an alternative of this embodiment, the rotary vibration table further comprises a housing (not shown); the outer shell is sleeved on the base 16 and forms a shell cavity with the base 16; the shell is provided with a groove (not marked in the figure) corresponding to the rotating platform 3, and the table top of the rotating platform 3 protrudes out of the shell; the support shaft 1, the driving coil 8, the feedback coil 5, the driving magnetic circuit 14 and the feedback magnetic circuit 22 are all disposed in the housing cavity. By making the table top of the rotating table 3 protrude out of the shell, instruments and equipment needing detection and calibration, such as a seismic rotation sensor, and the like, are fixed on the table top of the rotating table 3 and rotate around the axis of the supporting shaft 1 along with the rotating table 3 relative to the base 16.
Further, the housing includes a cover plate 10 and a side wall 11; the side wall 11 is fixedly connected with the cover plate 10 and the base 16, and the cover plate 10, the side wall 11 and the base 16 form a shell cavity; the supporting shaft 1, the driving coil 8, the feedback coil 5, the driving magnetic circuit 14 and the feedback magnetic circuit 22 are all arranged in the shell cavity; the cover plate 10 is provided with a groove corresponding to the rotating platform 3, and the table surface of the rotating platform 3 protrudes out of the cover plate 10.
Optionally, the sidewall 11 is circular in cross-section. Optionally, the cover plate 10 is fixedly connected to the side wall 11 by a cover plate fastening screw 12.
Alternatively, the rotating table 3 includes a table body 31 and two coil connecting members 32 fixedly connected to the table body 31. The groove of the cover plate 10 corresponds to the platform body 31, and the platform surface of the platform body 31 protrudes out of the cover plate 10.
The existing formula is as follows: angular acceleration
In the formula, theta is angular displacement, and f is frequency; according to the formula, when the measuring range of the angular displacement is small, the amplitude of the angular acceleration is smaller when the angular displacement is measured at ultralow frequency, so that larger errors are brought to ultralow frequency calibration of devices such as an earthquake rotation accelerometer. In the rotary vibration table of the embodiment, the driving magnetic circuit 14 and the feedback magnetic circuit 22 are used to increase the measuring range of the angular displacement measurement to +/-45 degrees; the bearing capacity is improved by the supporting shaft 1 and the rotating table 3, and can reach 60kg; the driving coil 8 rotates in a reciprocating mode around the axis of the supporting shaft 1 in the driving magnetic circuit 14, and the feedback coil 5 rotates in a reciprocating mode around the axis of the supporting shaft 1 in the feedback magnetic circuit 22, so that the low-frequency characteristic of the rotary vibration table is expanded, and the frequency can reach 0.003Hz.
Referring to fig. 8, in an alternative to this embodiment, the rotating oscillating table includes a signal source 101, an adder 102, a power amplifier 103, a feedback amplifier 104, an integrator 105, and a follower 106.
The driving coil 8 is electrically connected with a signal source 101 through a power amplifier 103 and an adder 102 in sequence, and the signal source 101 is used for providing a sinusoidal voltage signal; the feedback coil 5 is electrically connected to the adder 102 through a feedback amplifier 104, and the feedback coil 5 is further connected to an integrator 105 and a follower 106, respectively, so that the follower 106 outputs an angular vibration velocity signal and the integrator 105 outputs an angular vibration displacement signal.
The signal source 101 may be, for example, a signal generator; when the sinusoidal voltage signal output by the signal generator passes through the adder 102 and the power amplifier 103 and is input to the fan-shaped driving coil 8, the driving coil 8 moves in the magnetic gap of the fan-shaped driving magnetic circuit 14 to drive the rotating table 3 to do angular vibration. The feedback coil 5 moving synchronously with the driving coil 8 moves in the magnetic gap of the feedback magnetic circuit 22 to generate induced electromotive force, the induced electromotive force is input to the driving coil 8 through the feedback amplifier 104, the adder 102 and the power amplifier 103 to generate damping force, and the damping ratio of the rotating table 3 can be greatly improved by adjusting the amplification factor of the feedback amplifier 104, namely the damping ratio of the rotating vibrating table can be greatly improved, so that the low-frequency characteristic of the rotating vibrating table is expanded. At the same time, the electromotive force induced by the feedback coil 5 is also input to the follower 106 and the integrator 105, and the angular vibration velocity is output separately from the rotational vibration velocity
Voltage V proportional to angular vibration displacement theta θ′ And V θ The voltage can be used as standard signal voltage for ultralow frequency calibration of equipment such as a rotary seismic sensor.
When air damping is neglected, the differential equation of the rotating vibration table is:
in the formula: theta the angular displacement of the turntable 3,
the angular velocity of the rotating table 3; />
Angular acceleration of the rotating table 3;
T m ＝G 2 ir is a driving moment, i is a current flowing in the driving coil 8, and R is a loop resistance of the power amplifier 103.
Since the turntable 3 is operated at low and ultra low frequency bands, the coil inductance effect is negligible.
The solution of equation (1) is:
the damping ratio of the turntable 3 can be found as follows:
as can be seen from equation (3), when the mechanical parameters of the rotating table 3 and the number of turns of the coil are determined, the damping ratio can be increased only by increasing the amplification factor K of the feedback amplifier 104.
The natural frequency of the rotary table 3 is
The lower limit of the low frequency of the turntable 3 is
It can be seen from equation (5) that the higher the damping ratio, the lower the low frequency limit of the rotating oscillating table is.
In the embodiment, the rotary vibration table adopts a symmetrical planar fan-shaped magnetic circuit structure, a fan-shaped coil structure and a reset device 19, so that the wide-range angular vibration displacement measurement can be realized.
Example two
The second embodiment provides a rotary vibration system, the second embodiment comprises the rotary vibration table described in the first embodiment, the technical features of the rotary vibration table disclosed in the first embodiment are also applicable to the second embodiment, and the technical features of the rotary vibration table disclosed in the first embodiment are not repeatedly described.
For economy of space, the improved features of this embodiment are also embodied in fig. 1 and 2, and therefore the solution of this embodiment is described in connection with fig. 1 and 2.
Referring to fig. 1 and 2, the rotational vibration system provided in this embodiment includes a rotational vibration table.
A limiting groove 33 is arranged on the table surface of the rotating table 3 of the rotating vibration table; the shell is provided with a locking limiting device 23 corresponding to the limiting groove 33, namely the cover plate 10 is provided with the locking limiting device 23 corresponding to the limiting groove 33; the locking piece of the locking and limiting device 23 can be inserted into the limiting groove 33; through the limiting groove 33 and the locking limiting device 23, the rotating table 3 of the rotating vibration table can be locked, and damage to the rotating vibration system in the transportation process is avoided or reduced. In addition, the limiting groove 33 can be used for fixing equipment such as a rotary seismic sensor.
Optionally, the limiting groove 33 and the locking member adopt a dovetail mortise and tenon structure.
Optionally, the housing is provided with a scale 24 corresponding to the turntable 3, i.e. the cover plate 10 is provided with a scale 24 corresponding to the turntable 3. The scale disc 24 is used for facilitating the reading of the angular displacement range of the rotary vibration table.
In this embodiment the rotation vibration system has simple structure including rotating the shaking table, be convenient for production and processing and price low relatively to and have and bear the weight of advantages such as the dynamic height, the lowest measuring frequency is lower.
The rotary vibration system in the embodiment has the advantages of the rotary vibration table in the first embodiment, and other advantages of the rotary vibration table disclosed in the first embodiment are not described repeatedly here.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A rotary vibration table is characterized by comprising a base, a supporting shaft and a rotary table; the supporting shaft is connected with the base and the rotating platform, and the rotating platform can rotate around the axis of the supporting shaft relative to the base;
a driving coil and a feedback coil are arranged between the base and the rotating table; the driving coil and the feedback coil are arranged on two sides of the supporting shaft and are respectively and fixedly connected with the rotating table;
the base is fixedly connected with a driving magnetic circuit and a feedback magnetic circuit; the driving coil can rotate around the axis of the supporting shaft in a reciprocating mode in the driving magnetic circuit, and the feedback coil can rotate around the axis of the supporting shaft in a reciprocating mode in the feedback magnetic circuit;
the driving magnetic circuit comprises a first driving magnetizer, a second driving magnetizer and a driving permanent magnet; the first driving magnetizer and the second driving magnetizer are sequentially arranged at intervals along the axial direction of the support shaft, and the second driving magnetizer is fixedly connected with the base;
the first end of the first driving magnetizer and the first end of the second driving magnetizer are respectively arranged at intervals with the driving coil; a second end corresponding to the first drive magnetizer and a second end corresponding to the second drive magnetizer are respectively and fixedly connected with the drive permanent magnet;
the feedback magnetic circuit comprises a first feedback magnetizer, a second feedback magnetizer and a feedback permanent magnet; the first feedback magnetizer and the second feedback magnetizer are sequentially arranged at intervals along the axial direction of the support shaft, and the second feedback magnetizer is fixedly connected with the base;
the first end of the first feedback magnetizer and the first end of the second feedback magnetizer are respectively arranged at intervals with the feedback coil; a second end corresponding to the first feedback magnetizer and a second end corresponding to the second feedback magnetizer are respectively and fixedly connected with the feedback permanent magnet;
along the axial direction of the supporting shaft, driving magnetic yokes are respectively arranged at one ends, close to the driving coil, of the first driving magnetizer and the second driving magnetizer, and feedback magnetic yokes are respectively arranged at one ends, close to the feedback coil, of the first feedback magnetizer and the second feedback magnetizer;
a reset device for resetting the rotating table is arranged between the supporting shaft and the rotating table; the reset device comprises an elastic sheet or a spring;
the rotating table comprises a table body and two coil connecting pieces fixedly connected with the table body;
the two coil connecting pieces are arranged on two sides of the supporting shaft and are respectively and fixedly connected with the driving coil and the feedback coil;
one end of the elastic sheet or the spring is fixedly connected with the coil connecting piece, and the other end of the elastic sheet or the spring is connected with the supporting shaft;
the number of the elastic pieces or the springs is two, and the two groups of the elastic pieces or the springs are symmetrically arranged on two sides of the supporting shaft.
2. The rotary vibration table according to claim 1, wherein the second drive magnetizer is fixedly connected with the base through a drive magnetic circuit seat;
the second feedback magnetizer is fixedly connected with the base through the feedback magnetic circuit seat.
3. A rotary vibration table according to claim 1, wherein in the axial direction of the support shaft, the drive coil, the first drive magnetizer, the second drive magnetizer, and the drive permanent magnet are each in a sector ring shape centered on the axis of the support shaft, and the feedback coil, the first feedback magnetizer, the second feedback magnetizer, and the feedback permanent magnet are each in a sector ring shape centered on the axis of the support shaft.
4. A rotary vibration table according to claim 1, wherein the driving coil and the feedback coil are symmetrically disposed on both sides of the support shaft, and the driving magnetic circuit and the feedback magnetic circuit are symmetrically disposed on both sides of the support shaft.
5. A rotary vibration table according to any one of claims 1 to 4, wherein the support shaft is fixedly connected to the base, and a bearing is provided between the support shaft and the rotary table.
6. A rotary vibration table according to any one of claims 1 to 4, further comprising a housing; the shell is sleeved on the base and forms a shell cavity with the base;
the shell is provided with a groove corresponding to the rotating table, and the table surface of the rotating table protrudes out of the shell;
the support shaft, the drive coil, the feedback coil, the drive magnetic circuit and the feedback magnetic circuit are all arranged in the shell cavity.
7. A rotary vibration system comprising the rotary vibration table of claim 6;
a limiting groove is formed in the table surface of the rotating table of the rotating vibration table; the shell is provided with a locking limiting device corresponding to the limiting groove; the locking piece of the locking limiting device can be inserted into the limiting groove;
the shell is provided with a dial corresponding to the rotating table.
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| CN201710119871.9A CN106644343B (en) | 2017-03-01 | 2017-03-01 | Rotary vibration table and system thereof |
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| CN108344494A (en) * | 2018-01-22 | 2018-07-31 | 浙江大学 | Low frequency electromagnetic shake table movement velocity detection device based on induction coil |
| CN109946032B (en) * | 2019-04-09 | 2020-08-21 | 郑州航空工业管理学院 | Airport runway anti-seismic toughness detection device and detection method |
| CN112432698A (en) * | 2020-11-12 | 2021-03-02 | 中国航空工业集团公司北京长城计量测试技术研究所 | Double-coil standard vibration table with reciprocity |
| CN112857723B (en) * | 2021-01-21 | 2022-01-11 | 华中科技大学 | Experimental test method and device for torsional vibration of rotating shaft |
| CN112964353B (en) * | 2021-04-21 | 2021-10-12 | 中国地震局工程力学研究所 | Double-magnetic-circuit sensor |
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