CN103453896A - Magnetic-fluid gyroscope - Google Patents
Magnetic-fluid gyroscope Download PDFInfo
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- CN103453896A CN103453896A CN2013104213159A CN201310421315A CN103453896A CN 103453896 A CN103453896 A CN 103453896A CN 2013104213159 A CN2013104213159 A CN 2013104213159A CN 201310421315 A CN201310421315 A CN 201310421315A CN 103453896 A CN103453896 A CN 103453896A
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Abstract
The invention relates to a magnetic-fluid gyroscope. An inwardly-concave stud bolt hole is formed at the outer bottom of a metal shell, and a permanent magnet, a sealing sleeve, a core column, a pressing sleeve and a threaded gland are arranged inside the metal shell, wherein the bottom of the permanent magnet is connected with the inner bottom surface of the metal shell, the sealing sleeve is arranged on the permanent magnet and wraps the outer periphery edge of the permanent magnet, a seal ring is arranged at the outer periphery of the sealing sleeve, the bottom end surface of the core column is connected with the center part of the upper end surface of the sealing sleeve, an inner electrode hole sinking inwardly in the axial direction is formed on the upper end surface of the core column, a run-through hole is formed in the pressing sleeve in the axial direction, the pressing sleeve is sleeved at the periphery of the core column through the run-through hole, a fluid flow passage is formed between the bottom end surface of the pressing sleeve and the upper end surface of the sealing sleeve, magnetic fluid is arranged in the fluid flow passage, the threaded gland is embedded into a space formed by the pressing sleeve and the inner periphery edge of the metal shell and is in threaded connection with the inner periphery edge of the metal shell, and two outer electrode holes are symmetrically formed in the threaded gland. The magnetic-fluid gyroscope has the characteristics of high reliability, high intensity and long life, and can stably work in a severe environment such as high impact strength.
Description
Technical field
The present invention relates to a kind of gyro.Particularly relate to a kind of angular oscillation sensor based on magnetic fluid to vibration acceleration and the insensitive magnetic fluid gyro of quadrature axis angular velocity.
Background technology
At present, spacefaring nation is all competitively developing satellite platform and the application technologies such as high resolving power earth observation, high precision sensing.It is the prerequisite and basis that realizes that the useful load high-precision attitudes such as satellite platform and remote sensing system point to that the micro-angular oscillation of satellite is measured with controlling.
Provide the gyro of the micro-angular oscillation information of satellite to have concurrently to be with the characteristics such as roomy (approaching 1KHz), volume are little, lightweight, life-span length, shock resistance, and be that traditional mechanical gyro or optical fibre gyro, MEMS gyro all can not have these characteristics concurrently at present.Therefore, be necessary in fact to propose the needs that a kind of Gyros is measured to meet micro-angular oscillation.
Summary of the invention
Technical matters to be solved by this invention is, provide a kind of and there is high reliability, high strength, long-life, be with roomy, power consumption is little, volume is little, lightweight, cost is low and to vibration acceleration and the insensitive magnetic fluid gyro of quadrature axis angular velocity.
The technical solution adopted in the present invention is: a kind of magnetic fluid gyro, include metal shell, and it is characterized in that, the outer bottom of described metal shell is formed with inwardly recessed stud bolt hole, and the inside of described metal shell is provided with:
Permanent magnet, the bottom of described permanent magnet is connected on the inner bottom surface of metal shell;
Sealing shroud, described sealing shroud is arranged on permanent magnet, and wraps the neighboring of described permanent magnet, and the neighboring of described sealing shroud is provided with O-ring seal;
Stem stem, the bottom face of described stem stem is connected to the central part of described sealing shroud upper surface, in the upper surface of described stem stem, inwardly recessedly vertically is formed with interior electrode hole;
Gland, described gland axially is formed with through hole, and is enclosed within the periphery of described stem stem by this through hole, between the bottom face of described gland and the upper surface of described sealing shroud, is formed with fluid passage, in described fluid passage, is provided with magnetic fluid;
Union (screwed)bonnet (UB, be embedded in the formed space of inside circumference of described gland and described metal shell, and be threaded with the inside circumference of described metal shell, symmetrically on described union (screwed)bonnet (UB is provided with two external electrode holes.
The sensitive axes of the axis of described metal shell, stud bolt hole, permanent magnet, sealing shroud, stem stem, gland and union (screwed)bonnet (UB and this magnetic fluid gyro is on same axis.
On the inner peripheral surface of described metal shell with described gland and described union (screwed)bonnet (UB corresponding section, being formed with respectively under metal shell hole on hole shoulder and metal shell takes on, it is upper that the neighboring of described gland bottom is pressed under described metal shell the hole shoulder, and the neighboring of described union (screwed)bonnet (UB is pressed on described metal shell on the shoulder of hole.
Described sealing shroud is disc-shaped structure, bottom at this disc-shaped structure is formed with groove, described permanent magnet is embedded in this groove, and with sealing shroud be interference fit, be formed with an inwardly recessed circle groove on the lateral circle surface of this disc-shaped structure, described O-ring seal is embedded in described this circle groove.
The axle of the ladder-type structure that described stem stem is two shaft parts is formed with for supporting the stem stem shaft shoulder of gland on the outer peripheral face of stem stem.
Described gland includes the chassis sleeve column that be formed on center chassis vertical with one, along described chassis and sleeve column axially be formed with up/down perforation for being inserted in the through hole of stem stem, the inside circumference of bottom, described chassis is pressed on the stem stem shaft shoulder that is formed on the stem stem outer peripheral face, and the neighboring of bottom, described chassis is pressed under the metal shell on the inner peripheral surface that is formed on metal shell on the shoulder of hole.
Described chassis respectively with the stem stem shaft shoulder and metal shell under the contact position of hole shoulder be provided with the epoxide-resin glue for preventing that magnetic fluid is excessive.
Described union (screwed)bonnet (UB is disc-shaped structure, at central part, be formed with for being inserted in the through hole of gland, be formed with the external thread be connected with the internal thread of described metal shell on outside circumference, on the upper surface of described disc-shaped structure, two chuck holes of assembling are convenient in symmetrical being formed with.
A kind of magnetic fluid gyro of the present invention, be full of magnetic fluid the fluid passage of the upper lower wall insulation of one inside and outside wall conduction, in the high-intensity magnetic field identical with inputting the sensitive axes direction in direction of fluid passage.When there is the turning rate input coaxial with sensitive axes in the external world, magnetic fluid and fluid passage produce relative motion, under magnetic fields, on the inside and outside wall of fluid passage, produce electric potential difference, after being processed by detection system, obtain the signal relevant to input angular velocity.The present invention is based on new principle, novel structure, do not have the solid moving-member, do not have mechanical wear, therefore has high reliability, high strength, long-life characteristics; Loop configuration design has greatly reduced the sensitivity to vibration acceleration and quadrature axis angular velocity, therefore can be at the steady operation under rugged environment extremely such as thump; The principle of work of relative motion makes prime sensor bandwidth there is no in theory the upper limit, and the whole system bandwidth upper limit only determines by signal processing circuit filtering link, so bandwidth very large (can surpass 1KHz); Prime sensor itself, without power supply, only have signal processing circuit to need power supply, so power consumption is little; This structure can be accomplished small size, little weight, low cost in addition.In sum, this invention possesses micro-angular oscillation and measures required characteristic.Advantage of the present invention and beneficial effect are specific as follows:
1, the present invention is based on MHD effect (MHD), to be different from mechanical gyro (dynamic tuned gyroscope, liquid floated gyroscope, electrostatic gyroscope etc.), optical gyroscope (laser gyro, optical fibre gyro), the MEMS gyro Gyros, be the innovation on gyro principle;
2, novel structure of the present invention, do not have the solid moving-member, do not have mechanical wear, therefore has high reliability, high strength, long-life characteristics;
Therefore 3, the annular fluid passage structure adopted in the present invention has greatly reduced the sensitivity to vibration acceleration and quadrature axis angular velocity, can be at the steady operation under rugged environment extremely such as thump;
4, the principle adopted in the present invention makes prime sensor bandwidth there is no in theory the upper limit, and the whole system bandwidth upper limit only determines by signal processing circuit filtering link, so bandwidth very large (can surpass 1KHz);
5, in the present invention, prime sensor itself, without power supply, only have signal processing circuit to need power supply, so power consumption is little;
6, in the present invention, the fluid passage effective width only needs the mm magnitude just can obtain enough output signals, so the present invention can accomplish small size, little weight.In addition, the gyro (except the MEMS gyro) that the present invention compares other type all has obvious cost advantage.
The accompanying drawing explanation
Fig. 1 is the front view of a kind of magnetic fluid gyro of the present invention;
Fig. 2 is the vertical view of a kind of magnetic fluid gyro of the present invention;
Fig. 3 is the structural representation of the gland in a kind of magnetic fluid gyro of the present invention;
Fig. 4 is the principle of work schematic diagram of a kind of magnetic fluid gyro of the present invention;
Fig. 5 is amplitude frequency curve and the phase frequency curve of a kind of magnetic fluid gyro of the present invention.
In figure:
1: metal shell 2: internal thread
3: stud bolt hole 4: permanent magnet
5: sensitive axes 6: sealing shroud
7: O-ring seal 8: fluid passage
9: magnetic fluid 10: stem stem
11: interior electrode hole 12: gland
13: hole shoulder 14 under metal shell: the stem stem shaft shoulder
15: union (screwed)bonnet (UB 16: the external electrode hole
17: hole shoulder 18 on metal shell: chuck hole
19: magnetic induction line
Embodiment
Below in conjunction with embodiment and accompanying drawing, a kind of magnetic fluid gyro of the present invention is described in detail.
As shown in Figure 1 and Figure 2, a kind of magnetic fluid gyro of the present invention, include metal shell 1, and the outer bottom of described metal shell 1 is formed with inwardly recessed stud bolt hole 3, conveniently magnetic fluid gyro 100 is fixed on tested carrier, the stud bolt hole axis overlaps with the sensitive axes 5 of magnetic fluid gyro 100.Described metal shell 1 profile is right cylinder, in the described gland 12 of the inner peripheral surface up and down of this metal shell 1 face and described union (screwed)bonnet (UB 15 corresponding sections, be formed with respectively under metal shell hole shoulder 17 on hole shoulder 13 and metal shell, the neighboring of gland described below 12 bottoms is pressed in hole under described metal shell and takes on 13, and the neighboring of union (screwed)bonnet (UB 15 described below is pressed in hole on described metal shell and takes on 17.Described metal shell 1 material should be selected the soft magnetic material with high saturation magnetic flux density, can select ferrocobalt (especially vanadium iron cobalt-base alloy) or iron-nickel alloy, can avoid like this enclosure interior transducing part to be subject to the outside electromagnetic interference impact, can coordinate again permanent magnet 4 to form closed magnetic circuit simultaneously.
The inside of described metal shell 1 is provided with:
Sealing shroud 6, described sealing shroud 6 is arranged on permanent magnet 4, and wraps the neighboring of described permanent magnet 4, and the neighboring of described sealing shroud 6 is provided with O-ring seal 7; As shown in Figure 1, described sealing shroud 6 is disc-shaped structure, bottom at this disc-shaped structure is formed with groove, described permanent magnet 4 is embedded in this groove, and with sealing shroud 6 be interference fit, be formed with an inwardly recessed circle groove on the lateral circle surface of this disc-shaped structure, described O-ring seal 7 is embedded in described this circle groove, prevents that magnetic fluid 9 from flowing into gap and contacting with permanent magnet 4.The material of sealing shroud 6 should be selected the insulating material of shock resistance, high rigidity and stable chemical nature, as a kind of preferred implementation, selects polycarbonate.
Union (screwed)bonnet (UB 15, be embedded in the formed space of inside circumference of described gland 12 and described metal shell 1, and be threaded with the inside circumference of described metal shell 1, symmetrically on described union (screwed)bonnet (UB 15 is provided with two external electrode holes 16.As shown in Figure 1, described union (screwed)bonnet (UB 15 is disc-shaped structure, at central part, be formed with for being inserted in the through hole of gland 12, be formed with the external thread be threaded with the inside circumference of described metal shell 1 on outside circumference, on the upper surface of described disc-shaped structure, two chuck holes 18 of assembling are convenient in symmetrical being formed with.Union (screwed)bonnet (UB 15 is pressed on hole on gland 12 and metal shell and takes on 17, and has coordinated the sealing of whole device with the internal thread 2 of metal shell 1.Union (screwed)bonnet (UB 15 is identical with the material of metal shell 1, the current potential that both are identical because threaded engagement has.External electrode hole 16 on union (screwed)bonnet (UB 15, for taking out the electric potential signal of fluid passage 8 outer walls.
The axis of described metal shell 1, stud bolt hole 3, permanent magnet 4, sealing shroud 6, stem stem 10, gland 12 and union (screwed)bonnet (UB 15 and the sensitive axes 5 of this magnetic fluid gyro are on same axis.
The principle of work of a kind of magnetic fluid gyro of the present invention is as follows:
Magnetic fluid gyro principle of work is based on MHD effect (MHD), the i.e. coupling effect in conductive fluid velocity field and magnetic field.As shown in Figure 4, when the external world when sensitive axes 5 directions of magnetic fluid gyro 100 have the angular velocity omega input, permanent magnet 4 and 8 relative inertness spaces, fluid passage produce angular displacement, and little viscosity magnetic fluid 9 inertia are large, therefore almost static with respect to inertial space, produce a relative velocity v between the magnetic field that magnetic fluid 9 and permanent magnet 4 produce like this
q, magnetic fluid 9 cutting magnetic induction lines 19 produce the motional electromotive force E linear with ω between metal shell 1 and stem stem 10, by detecting E, just can obtain current input angular velocity ω.
In the ideal situation, magnetic fluid gyro prime sensor transfer function is
Wherein: B is external magnetic field magnetic induction density (T); W is fluid passage effective width, i.e. W=r
o-r
i(m); R is radius root mean square,
υ is magnetic fluid kinematic viscosity (m
2/ s); H is fluid channel height (m); H is the Hartmann constant,
(dimensionless); ρ is magnetic fluid density (kg/m
3); η is magnetic fluid resistivity (Ω m).
Magnetic fluid gyro amplitude-frequency and phase frequency curve are as shown in Figure 5, the similar Hi-pass filter of magnetic fluid gyro prime sensor transfer function, there is no in theory the bandwidth upper limit, therefore the bandwidth upper limit of whole magnetic fluid gyro is only determined by the low-pass filtering link of signal processing circuit, and this also depends on the squelch degree of whole signal processing circuit.In order to obtain the high as far as possible bandwidth upper limit, the amplification of magnetic fluid gyroscope signal process circuit prime should adopt discrete component to build, and adopts integrated transporting discharging to complete the second level and amplifies, and low-pass filtering is limited in circuit noise in the acceptable scope of relatively required resolution.
Claims (8)
1. a magnetic fluid gyro, include metal shell (1), it is characterized in that, the outer bottom of described metal shell (1) is formed with inwardly recessed stud bolt hole (3), and the inside of described metal shell (1) is provided with:
Permanent magnet (4), the bottom of described permanent magnet (4) is connected on the inner bottom surface of metal shell (1);
Sealing shroud (6), it is upper that described sealing shroud (6) is arranged on permanent magnet (4), and wrap the neighboring of described permanent magnet (4), and the neighboring of described sealing shroud (6) is provided with O-ring seal (7);
Stem stem (10), the bottom face of described stem stem (10) is connected to the central part of described sealing shroud (6) upper surface, the upper surface in described stem stem (10), the inside recessed interior electrode hole (11) that is formed with vertically;
Gland (12), described gland (12) axially is formed with through hole, and be enclosed within the periphery of described stem stem (10) by this through hole, be formed with fluid passage (8) between the upper surface of the bottom face of described gland (12) and described sealing shroud (6), be provided with magnetic fluid (9) in described fluid passage (8);
Union (screwed)bonnet (UB (15), be embedded in the formed space of inside circumference of described gland (12) and described metal shell (1), and be threaded with the inside circumference of described metal shell (1), upper symmetrical two the external electrode holes (16) that are provided with of described union (screwed)bonnet (UB (15).
2. a kind of magnetic fluid gyro according to claim 1, it is characterized in that, the axis of described metal shell (1), stud bolt hole (3), permanent magnet (4), sealing shroud (6), stem stem (10), gland (12) and union (screwed)bonnet (UB (15) and the sensitive axes (5) of this magnetic fluid gyro are on same axis.
3. a kind of magnetic fluid gyro according to claim 1, it is characterized in that, on the inner peripheral surface of described metal shell (1) with described gland (12) and described union (screwed)bonnet (UB (15) corresponding section, be formed with respectively hole under metal shell and take on hole shoulder (17) on (13) and metal shell, the neighboring of described gland (12) bottom is pressed in hole under described metal shell and takes on (13) above, and the neighboring of described union (screwed)bonnet (UB (15) is pressed in hole on described metal shell and takes on (17).
4. a kind of magnetic fluid gyro according to claim 1, it is characterized in that, described sealing shroud (6) is disc-shaped structure, bottom at this disc-shaped structure is formed with groove, described permanent magnet (4) is embedded in this groove, and with sealing shroud (6) be interference fit, be formed with an inwardly recessed circle groove on the lateral circle surface of this disc-shaped structure, described O-ring seal (7) is embedded in described this circle groove.
5. a kind of magnetic fluid gyro according to claim 1, is characterized in that, the axle of the ladder-type structure that described stem stem (10) is two shaft parts is formed with for supporting the stem stem shaft shoulder (14) of gland (12) on the outer peripheral face of stem stem (10).
6. a kind of magnetic fluid gyro according to claim 1, it is characterized in that, described gland (12) includes chassis (121) sleeve column (122) that be formed on chassis (121) center vertical with one, the through hole (123) for being inserted in stem stem (10) that axially is formed with up/down perforation along described chassis (121) and sleeve column (122), the inside circumference of bottom, described chassis (121) is pressed on the stem stem shaft shoulder (14) that is formed on stem stem (10) outer peripheral face, the neighboring of bottom, described chassis (121) is pressed in hole under the metal shell on the inner peripheral surface that is formed on metal shell (1) and takes on (13).
7. a kind of magnetic fluid gyro according to claim 6, is characterized in that, described chassis (121) respectively with the stem stem shaft shoulder (14) and metal shell under the contact position of hole shoulder (13) be provided with the epoxide-resin glue for preventing that magnetic fluid (9) is excessive.
8. a kind of magnetic fluid gyro according to claim 1, it is characterized in that, described union (screwed)bonnet (UB (15) is disc-shaped structure, at central part, be formed with for being inserted in the through hole of gland (12), be formed with the external thread be connected with the internal thread (2) of described metal shell (1) on outside circumference, on the upper surface of described disc-shaped structure, two chuck holes (18) of assembling are convenient in symmetrical being formed with.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727935A (en) * | 2013-12-31 | 2014-04-16 | 天津大学 | Triaxial magnetofluid gyroscope |
| CN103760616A (en) * | 2014-01-24 | 2014-04-30 | 天津大学 | Magnetic fluid compound gravity gradiometer |
| CN103941034A (en) * | 2014-04-03 | 2014-07-23 | 天津大学 | Magnetofluid composite angular velocity sensor |
| CN106500681A (en) * | 2016-12-01 | 2017-03-15 | 上海航天控制技术研究所 | A kind of angle random vibration sensor construction |
| CN107289919A (en) * | 2017-06-01 | 2017-10-24 | 西安交通大学 | A kind of annular electro resistive MEMS liquid angle gyroscopes |
| CN108982902A (en) * | 2018-05-31 | 2018-12-11 | 天津大学 | A kind of Magnetic Fluid Vacuum device for casting and method |
| CN110208567A (en) * | 2019-05-28 | 2019-09-06 | 南方科技大学 | Non-contact magnetic fluid rotating speed measuring device, design method and rotating speed measuring method |
| CN110460204A (en) * | 2019-08-12 | 2019-11-15 | 北京控制工程研究所 | A kind of magnetic fluid flywheel and design method |
| CN113432591A (en) * | 2021-06-23 | 2021-09-24 | 中国船舶重工集团公司第七0七研究所 | Tension-free hollow microstructure optical fiber ring winding method based on magnetic fluid |
| CN115979409A (en) * | 2023-03-22 | 2023-04-18 | 天津大学 | Angular vibration sensor based on magnetohydrodynamics and angular vibration detection method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103727935A (en) * | 2013-12-31 | 2014-04-16 | 天津大学 | Triaxial magnetofluid gyroscope |
| CN103760616A (en) * | 2014-01-24 | 2014-04-30 | 天津大学 | Magnetic fluid compound gravity gradiometer |
| CN103760616B (en) * | 2014-01-24 | 2017-01-04 | 天津大学 | Magnetic fluid compound gravity gradiometer |
| CN103941034A (en) * | 2014-04-03 | 2014-07-23 | 天津大学 | Magnetofluid composite angular velocity sensor |
| CN106500681A (en) * | 2016-12-01 | 2017-03-15 | 上海航天控制技术研究所 | A kind of angle random vibration sensor construction |
| CN106500681B (en) * | 2016-12-01 | 2019-03-26 | 上海航天控制技术研究所 | A kind of angle random vibration sensor structure |
| CN107289919A (en) * | 2017-06-01 | 2017-10-24 | 西安交通大学 | A kind of annular electro resistive MEMS liquid angle gyroscopes |
| CN108982902A (en) * | 2018-05-31 | 2018-12-11 | 天津大学 | A kind of Magnetic Fluid Vacuum device for casting and method |
| CN110208567A (en) * | 2019-05-28 | 2019-09-06 | 南方科技大学 | Non-contact magnetic fluid rotating speed measuring device, design method and rotating speed measuring method |
| WO2020238402A1 (en) * | 2019-05-28 | 2020-12-03 | 南方科技大学 | Non-contact magnetic fluid rotational speed measuring device, design method and rotational speed measuring method |
| CN110208567B (en) * | 2019-05-28 | 2023-10-20 | 南方科技大学 | Non-contact magnetic fluid rotating speed measuring device, design method and rotating speed measuring method |
| CN110460204A (en) * | 2019-08-12 | 2019-11-15 | 北京控制工程研究所 | A kind of magnetic fluid flywheel and design method |
| CN110460204B (en) * | 2019-08-12 | 2020-09-18 | 北京控制工程研究所 | Magnetic fluid flywheel and design method |
| CN113432591A (en) * | 2021-06-23 | 2021-09-24 | 中国船舶重工集团公司第七0七研究所 | Tension-free hollow microstructure optical fiber ring winding method based on magnetic fluid |
| CN113432591B (en) * | 2021-06-23 | 2022-09-16 | 中国船舶重工集团公司第七0七研究所 | Tension-free hollow microstructure optical fiber ring winding method based on magnetic fluid |
| CN115979409A (en) * | 2023-03-22 | 2023-04-18 | 天津大学 | Angular vibration sensor based on magnetohydrodynamics and angular vibration detection method |
| CN115979409B (en) * | 2023-03-22 | 2023-06-09 | 天津大学 | Angular vibration sensor based on magnetohydrodynamics and angular vibration detection method |
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