CN102778584A - Magnetorheological fluid acceleration sensor - Google Patents
Magnetorheological fluid acceleration sensor Download PDFInfo
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- CN102778584A CN102778584A CN2011101203993A CN201110120399A CN102778584A CN 102778584 A CN102778584 A CN 102778584A CN 2011101203993 A CN2011101203993 A CN 2011101203993A CN 201110120399 A CN201110120399 A CN 201110120399A CN 102778584 A CN102778584 A CN 102778584A
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Abstract
The invention relates to a magnetorheological fluid acceleration sensor. A non-magnetic mass block is placed inside a non-magnetic container, filled with magnetorheological fluid, and the mass block is fixed in the container by a spring. When the container generates the acceleration, the mass block generates the relative displacement with the container under the effects of the elastic force of the spring and the damping force of the magnetorheological fluid. The acceleration of the container can be calculated through detecting the relative displacement change. Because the damping coefficient of the magnetorheological fluid is changed along with the change of an external magnetic field, the measuring range of the acceleration is regulated through regulating the external magnetic field. The magnetorheological fluid acceleration sensor has the advantages that the measuring range is wide, the precision is high, the sensitivity is high, the response speed is high, and the like.
Description
Technical field
The invention belongs to the application of acceleration transducer, be specifically related to a kind of acceleration transducer based on magnetic flow liquid.
Background technology
Magnetic flow liquid is a kind of SMART FLUID material, is made up of magnetic particle, base fluid and adjuvant.Do the time spent in no external magnetic field, magnetic flow liquid presents the liquid condition of good fluidity; Its AV can be increased to more than two one magnitude in the short time (Millisecond) under the action of a magnetic field adding, thereby presents the state of similar solid." solid-state " magnetic flow liquid can convert fluid state (Wojciech Szelag. Finite element analysis of the magnetorheo-logical uid brake transients [J] .2004,23 (3): 758-766.) fast into after removing external magnetic field.
Acceleration transducer is a kind of equipment that can measure accelerating force, is widely used in fields such as Aero-Space, armament systems, automobile.Through measuring acceleration, can obtain the motion state of moving object.Thereby can be applicable to the vibration-testing and the analysis of control, automobile brake detection starting, seismic monitoring, geologic prospecting and bridge.The general rigidity of existing acceleration transducer is less, and measurement range is limited, reaches the ultimate value of its range in the use easily.
Summary of the invention
In order effectively to improve the measurement range of acceleration, the present invention proposes a kind of magnetic flow liquid acceleration transducer.This device mainly is divided into accelerating testing device, signaling conversion circuit and range control circuit three parts.
Accelerating testing device is made up of non magnetic container, detection electric capacity, field coil, non magnetic moving mass, magnetic flow liquid and spring.Magnetic flow liquid is full of non magnetic container, and non magnetic moving mass is suspended in the magnetic flow liquid, and it is fixed by two springs respectively at two ends up and down, and the spring other end is fixed in the non magnetic container.Field coil is used for for magnetic flow liquid magnetic field being provided.Non magnetic moving mass is used as movable plate electrode, outside non magnetic container, fixed plate is set, and the two constitutes detection electric capacity.When non magnetic container moves, non magnetic moving mass will produce relative displacement with non magnetic container, will change thereby detect electric capacity.
Signaling conversion circuit is made up of the scale operation circuit that detection electric capacity, feedback resistance, feedback capacity and operational amplifier constitute.After with an ac voltage signal this scale operation circuit being encouraged, be converted into ac voltage signal with detecting the variation of electric capacity with relative displacement.With embedded system or virtual instrument or single-chip microcomputer this voltage signal is carried out computing and can obtain relative displacement over time, thereby can get the size of the acceleration of non magnetic container with handling.
The range control circuit is made up of the scale operation circuit that known resistance, feedback resistance, multi-way switch, field coil and operational amplifier constitute.After with a direct current voltage signal this scale operation circuit being encouraged, control a plurality of feedback resistances, thereby realize the DC voltage output of different amplitudes through multi-way switch.Use the size of current in the DC voltage controlling magnetic field coil of being exported, thereby in coil, will produce the magnetic field of different sizes.Magnetic flow liquid ratio of damping under different magnetic field is different, thereby realizes the measuring range adjustable of acceleration transducer.
The present invention is simple in structure, the size of sense acceleration effectively not only, and can realize the acceleration analysis of different ranges.
The technical scheme that the present invention adopted is following:
A kind of magnetic flow liquid acceleration transducer, this sensor comprise accelerating testing device, signaling conversion circuit and range control circuit three parts.
Said accelerating testing device is made up of non magnetic container, detection electric capacity, field coil, non magnetic mass, magnetic flow liquid and spring.Magnetic flow liquid is full of non magnetic container, and non magnetic moving mass is suspended in the magnetic flow liquid, and it is fixed by two springs respectively at two ends up and down, and the spring other end is fixed in the non magnetic container.Field coil is used for for magnetic flow liquid magnetic field being provided.Non magnetic mass is used as movable plate electrode, in non magnetic container, fixed plate is set, and the two constitutes detection electric capacity.When non magnetic container moves; Non magnetic mass will produce relative displacement with non magnetic container under spring power, magnetorheological fluid damp power, self gravitation, magnetic flow liquid buoyancy interact; Promptly detecting capacity area will change, and will change thereby detect electric capacity.
Said signaling conversion circuit is made up of the scale operation circuit that detection electric capacity, feedback resistance, feedback capacity and operational amplifier constitute.When test, import an ac voltage signal to circuit, after this ac voltage signal Comparative Examples computing circuit encourages, be converted into ac voltage signal with detecting the variation of electric capacity with relative displacement.With embedded system or virtual instrument or single-chip microcomputer this voltage signal is carried out computing and can obtain relative displacement over time, thereby can get the size of the acceleration of non magnetic container with handling.
Said range control circuit is made up of the scale operation circuit that known resistance, feedback resistance, multi-way switch, field coil and operational amplifier constitute.When test, import a direct current voltage signal to circuit.After this d. c. voltage signal Comparative Examples computing circuit encourages, control a plurality of feedback resistances, thereby realize the DC voltage output of different amplitudes through multi-way switch.Use the size of current in the DC voltage controlling magnetic field coil of being exported, thereby in coil, will produce the magnetic field of different sizes.Magnetic flow liquid ratio of damping under different magnetic field is different, thereby realizes the measuring range adjustable of acceleration transducer.
According to above-mentioned proving installation, the present invention further proposes a kind of acceleration detection method based on magnetic flow liquid, and this method may further comprise the steps:
(1) design is based on accelerating testing device, signaling conversion circuit and the range control circuit of magnetic flow liquid.
(2) select suitable measurement magnetic field through the range control circuit.
(3) will detect capacitance variations through signaling conversion circuit and convert the circuit output voltage variation into.
(4) through programmable virtual instrument or embedded system or single-chip microcomputer to above-mentioned voltage signal acquisition, data processing and computing, thereby obtain the size of acceleration.
The invention has the beneficial effects as follows:
(1) designs the magnetic flow liquid acceleration transducer.
(2) can detect the acceleration of different range abilities.
(3) for the application of magnetic flow liquid in sensing technology a kind of new method is provided.
Description of drawings:
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is an accelerating testing device synoptic diagram of the present invention;
1. field coils among the figure, 2. non magnetic container, 3. spring, 4. non magnetic annulus, 5. capacitor fixed plate, 6. magnetic flow liquid, 7. non magnetic mass, 8. Metallic rod, 9. Metallic rod, 10. insulating material
Fig. 2 is signaling conversion circuit figure;
Fig. 3 is range control circuit figure;
Embodiment:
With reference to Fig. 1, accelerating testing device involved in the present invention is made up of field coil 1, aluminum alloy container 2, spring 3, aluminium alloy annulus 4, detection capacitor fixed plate 5, magnetic flow liquid 6, aluminium alloy quality piece 7, aluminium alloy rod 8, aluminium alloy rod 9, pottery 10.Magnetic flow liquid 6 is full of aluminum alloy container 2, and aluminium alloy quality piece 7 (two ends are fixed with aluminium alloy rod 9 up and down) is suspended in the magnetic flow liquid 6, and two ends are fixing by two springs 6 respectively up and down for it, and the spring other end is fixed in the aluminum alloy container 2.Field coil 1 is used for for magnetic flow liquid 6 magnetic field being provided.Aluminium alloy rod 8 one ends are fixed on the aluminum alloy container 2, and the other end is fixed with aluminium alloy annulus 4 and is used for limiting aluminium alloy quality piece 7 and can only moves at vertical direction.Aluminium alloy quality piece 7 is used as the electric capacity movable plate electrode, aluminium alloy is set in aluminum alloy container 2 detects capacitor fixed plate 5, aluminum alloy container 2 and aluminium alloy detect between the capacitor fixed plate 5 isolates with pottery 10.Wherein aluminum alloy container 2, aluminium alloy quality piece 7, aluminium alloy detect capacitor fixed plate 5, pottery 10 is cylindrical.
With reference to Fig. 2, signaling conversion circuit constitutes by detecting capacitor C x (pico farad rank), known resistance R1, R2, feedback capacity C1, known capacitance C2, C3 and operational amplifier.
With reference to Fig. 3, range control circuit figure is made up of known resistance R3, R4, R5, R6, R7, operational amplifier, field coil and multi-way switch K1, K2 and K3.
With reference to Fig. 1,2,3, the acceleration analysis scheme is:
When aluminum alloy container 2 vertically moves, will produce acceleration a, aluminium alloy quality piece 7 will produce relative displacement with aluminum alloy container 2 under spring power, magnetorheological fluid damp power, self gravitation, magnetic flow liquid buoyancy interact.If relative displacement is y, then have:
After aluminium alloy quality piece 7 and aluminum alloy container 2 produce relative displacement, detecting electric capacity will change, and detect electric capacity and relative displacement relation and be:
Wherein, C0 is an initial capacitance, and r2 is the fixed plate internal diameter; R1 is the mass external diameter, is got by (2) formula:
With (3) formula substitution (1) formula and behind gamma correction, can get the size of acceleration a.
With reference to Fig. 2, detection capacitance measurement scheme is:
To circuit input sinusoidal signal U0 (t); Through sinusoidal signal U0 (t) tested detection electric capacity is encouraged; The exciting current detecting device of being made up of feedback resistance R1, feedback capacity C1 and operational amplifier of flowing through converts alternating voltage U1 (t) to, can be got by the circuit ultimate principle:
?（4）
When
, (3) formula becomes
（5）
With reference to Fig. 3, measurement different range acceleration scheme is:
To circuit input direct voltage U2; Encourage through DC voltage Comparative Examples computing circuit; Behind the feedback network of exciting current via multi-way switch K1, K2, K3 and resistance R 5, R6, R7 composition; Can obtain the output voltage U 3 of different sizes, U3 acts on the field coil, makes the magnetic fields that produce different sizes in the field coil.Because the ratio of damping of magnetic flow liquid changes with the variation of external magnetic field, thereby aluminium alloy quality piece 7 suffered damping forces will change with the variation in magnetic field.When acceleration a hour, it is less to regulate external magnetic field, makes damping force less; When acceleration was big, the adjusting external magnetic field was bigger, makes damping force bigger.Can measure the acceleration of different range in this way.
Claims (5)
1. magnetic flow liquid acceleration transducer, this sensor comprises accelerating testing device, signaling conversion circuit and range control circuit three parts, it is characterized by:
Said accelerating testing device is made up of non magnetic container, detection electric capacity, field coil, non magnetic mass, magnetic flow liquid and spring; Magnetic flow liquid is full of non magnetic container, and non magnetic moving mass is suspended in the magnetic flow liquid, and it is fixed by two springs respectively at two ends up and down, and the spring other end is fixed in the non magnetic container; Field coil is used for for magnetic flow liquid magnetic field being provided; Non magnetic mass is used as movable plate electrode, outside non magnetic container, fixed plate is set, and the two constitutes detection electric capacity; When non magnetic container moves; Non magnetic mass will produce relative displacement with non magnetic container under spring power, magnetorheological fluid damp power, self gravitation, magnetic flow liquid buoyancy interact; Promptly detecting capacity area will change, and will change thereby detect electric capacity;
Said signaling conversion circuit is made up of the scale operation circuit that detection electric capacity, feedback resistance, feedback capacity and operational amplifier constitute; When test, import an ac voltage signal to circuit, after this ac voltage signal Comparative Examples computing circuit encourages, be converted into ac voltage signal with detecting the variation of electric capacity with relative displacement; With embedded system or virtual instrument or single-chip microcomputer this voltage signal is carried out computing and can obtain relative displacement over time, thereby can get the size of the acceleration of non magnetic container with handling;
Said range control circuit is made up of the scale operation circuit that known resistance, feedback resistance, multi-way switch, field coil and operational amplifier constitute; When test, import a direct current voltage signal to circuit; After this d. c. voltage signal Comparative Examples computing circuit encourages, control a plurality of feedback resistances, thereby realize the DC voltage output of different amplitudes through multi-way switch; Use the size of current in the DC voltage controlling magnetic field coil of being exported, thereby in coil, will produce the magnetic field of different sizes; Magnetic flow liquid ratio of damping under different magnetic field is different, thereby realizes the measuring range adjustable of acceleration transducer;
According to above-mentioned proving installation, the present invention further proposes a kind of acceleration detection method based on magnetic flow liquid, and this method may further comprise the steps:
(1) design is based on accelerating testing device, signaling conversion circuit and the range control circuit of magnetic flow liquid;
(2) select suitable measurement magnetic field through the range control circuit;
(3) will detect capacitance variations through signaling conversion circuit and convert the circuit output voltage variation into;
(4) through programmable virtual instrument or embedded system or single-chip microcomputer to above-mentioned voltage signal acquisition, data processing and computing, thereby obtain the size of acceleration.
2. pick-up unit according to claim 1 is characterized by: said accelerating testing device is made up of field coil, non magnetic container, spring, non magnetic annulus, detection capacitor fixed plate, magnetic flow liquid, non magnetic mass, Metallic rod, insulating material; Magnetic flow liquid is full of non magnetic container, and non magnetic mass (two ends are fixed with Metallic rod up and down) is suspended in the magnetic flow liquid, and it is fixed by two springs respectively at two ends up and down, and the spring other end is fixed in the non magnetic container; Field coil is used for for magnetic flow liquid magnetic field being provided; Metallic rod one end is fixed on the non magnetic container, and the other end is fixed with non magnetic annulus and is used for limiting the aluminium alloy quality piece and can only moves at vertical direction; Non magnetic mass is used as the electric capacity movable plate electrode, non magnetic detection capacitor fixed plate is set in non magnetic container, isolate with insulating material between non magnetic container and the non magnetic detection capacitor fixed plate.
3. pick-up unit according to claim 2 is characterized by: said non magnetic container and non magnetic mass can be aluminium sheet, titanium alloy or tungsten-copper alloy etc.
4. pick-up unit according to claim 2 is characterized by: said non magnetic container and non magnetic mass can be right cylinder or rectangular parallelepiped.
5. pick-up unit according to claim 2 is characterized by: said insulating material can be mica, marble, porcelain or glass.
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| CN2011101203993A CN102778584A (en) | 2011-05-11 | 2011-05-11 | Magnetorheological fluid acceleration sensor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049108A (en) * | 2014-07-01 | 2014-09-17 | 重庆材料研究院有限公司 | Acceleration sensor based on magneto-rheological elastic body |
| CN106918720A (en) * | 2017-04-10 | 2017-07-04 | 浙江大学 | A kind of filament restricted type acceleration transducer |
| CN109267631A (en) * | 2018-11-08 | 2019-01-25 | 福州市规划设计研究院 | Master and slave type drainpipe and its installation, application method |
| CN109738051A (en) * | 2018-12-28 | 2019-05-10 | 重庆工商大学 | A kind of adaptive ultrasonic sensor of magnetorheological fluid and detection method |
| CN111307273A (en) * | 2020-03-27 | 2020-06-19 | 重庆理工大学 | Inductance type vibration sensor based on magnetic sensitive material |
| CN111637904A (en) * | 2020-04-22 | 2020-09-08 | 武汉船用机械有限责任公司 | Linear motion position detection device |
| CN111999572A (en) * | 2020-06-22 | 2020-11-27 | 重庆大学 | Interval capacitive sensor-based multi-parameter online monitoring device and method for gas-liquid two-phase fluid of power equipment |
| CN112710381A (en) * | 2020-12-18 | 2021-04-27 | 重庆理工大学 | Vertical vibration detection device |
| CN112925009A (en) * | 2021-01-25 | 2021-06-08 | 南京林业大学 | Multicomponent lunar seismic detector system suitable for moon |
| CN116538419A (en) * | 2023-05-08 | 2023-08-04 | 北京中科富海低温科技有限公司 | Magnetic force adjustable low-temperature container |
| WO2024071016A1 (en) * | 2022-09-30 | 2024-04-04 | 株式会社村田製作所 | Sensor amplification circuit, sensor system, and sensor amplification circuit calibration method |
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| CN2205963Y (en) * | 1994-07-30 | 1995-08-23 | 苏立 | Absolute amplitude sensor device |
| CN202119794U (en) * | 2011-05-09 | 2012-01-18 | 重庆师范大学 | Magnetorheological fluid acceleration intelligent sensing system |
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Patent Citations (2)
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| CN2205963Y (en) * | 1994-07-30 | 1995-08-23 | 苏立 | Absolute amplitude sensor device |
| CN202119794U (en) * | 2011-05-09 | 2012-01-18 | 重庆师范大学 | Magnetorheological fluid acceleration intelligent sensing system |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049108A (en) * | 2014-07-01 | 2014-09-17 | 重庆材料研究院有限公司 | Acceleration sensor based on magneto-rheological elastic body |
| CN106918720A (en) * | 2017-04-10 | 2017-07-04 | 浙江大学 | A kind of filament restricted type acceleration transducer |
| CN106918720B (en) * | 2017-04-10 | 2019-05-14 | 浙江大学 | A kind of filament restricted type acceleration transducer |
| CN109267631A (en) * | 2018-11-08 | 2019-01-25 | 福州市规划设计研究院 | Master and slave type drainpipe and its installation, application method |
| CN109267631B (en) * | 2018-11-08 | 2023-12-01 | 重庆大学 | Combined drain pipe and installation and use methods thereof |
| CN109738051A (en) * | 2018-12-28 | 2019-05-10 | 重庆工商大学 | A kind of adaptive ultrasonic sensor of magnetorheological fluid and detection method |
| CN111307273B (en) * | 2020-03-27 | 2021-12-17 | 重庆理工大学 | Inductance type vibration sensor based on magnetic sensitive material |
| CN111307273A (en) * | 2020-03-27 | 2020-06-19 | 重庆理工大学 | Inductance type vibration sensor based on magnetic sensitive material |
| CN111637904B (en) * | 2020-04-22 | 2022-11-22 | 武汉船用机械有限责任公司 | Linear motion position detection device |
| CN111637904A (en) * | 2020-04-22 | 2020-09-08 | 武汉船用机械有限责任公司 | Linear motion position detection device |
| CN111999572A (en) * | 2020-06-22 | 2020-11-27 | 重庆大学 | Interval capacitive sensor-based multi-parameter online monitoring device and method for gas-liquid two-phase fluid of power equipment |
| CN111999572B (en) * | 2020-06-22 | 2023-03-31 | 重庆大学 | Interval capacitive sensor-based multi-parameter online monitoring device and method for gas-liquid two-phase fluid of power equipment |
| CN112710381A (en) * | 2020-12-18 | 2021-04-27 | 重庆理工大学 | Vertical vibration detection device |
| CN112710381B (en) * | 2020-12-18 | 2022-09-30 | 重庆理工大学 | Vertical vibration detection device |
| CN112925009A (en) * | 2021-01-25 | 2021-06-08 | 南京林业大学 | Multicomponent lunar seismic detector system suitable for moon |
| WO2024071016A1 (en) * | 2022-09-30 | 2024-04-04 | 株式会社村田製作所 | Sensor amplification circuit, sensor system, and sensor amplification circuit calibration method |
| CN116538419A (en) * | 2023-05-08 | 2023-08-04 | 北京中科富海低温科技有限公司 | Magnetic force adjustable low-temperature container |
| CN116538419B (en) * | 2023-05-08 | 2024-01-30 | 北京中科富海低温科技有限公司 | Magnetic force adjustable low-temperature container |
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Application publication date: 20121114 |