CN110160914B - A magnetic fluid viscous damping characteristic testing device - Google Patents
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- CN110160914B CN110160914B CN201810158982.5A CN201810158982A CN110160914B CN 110160914 B CN110160914 B CN 110160914B CN 201810158982 A CN201810158982 A CN 201810158982A CN 110160914 B CN110160914 B CN 110160914B
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- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 238000013016 damping Methods 0.000 title claims abstract description 33
- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 66
- 238000010008 shearing Methods 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 8
- 230000005674 electromagnetic induction Effects 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 6
- 239000000696 magnetic material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract 3
- 239000000463 material Substances 0.000 description 14
- 230000005415 magnetization Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000011344 liquid material Substances 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
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Abstract
一种磁液粘滞阻尼特性测试装置，包括薄壁桶形无磁转子，恒定间隙，内、外极靴环，上、下导磁环片，永磁环，导磁体，贮液环，扭矩与转速传感器等部件构成，其特征是：内、外极靴环之间形成恒定间隙，并通过贮液环同心定位；内、外极靴环其中之一与导磁体紧固连接，另一个与上导磁环片形成可调间隙；永磁体夹在上、下导磁环片之间，并可上下移动；下导磁环片与导磁体相接触；磁液注入恒定间隙和贮液环内；薄壁桶形无磁转子同心插入恒定间隙内，转动后对磁液形成剪切作用，并将其粘滞阻尼特性转换为剪切扭矩被扭矩和转速传感器测定；其优点是测试数据只包含磁液的粘滞阻尼特性、磁场较低时磁液不会流走，精度高。
A magnetic fluid viscous damping characteristic testing device comprises a thin-walled barrel-shaped non-magnetic rotor, a constant gap, inner and outer pole shoe rings, upper and lower magnetic conductive ring pieces, a permanent magnetic ring, a magnetite, a liquid storage ring, a torque and speed sensor and other components. The device is characterized in that a constant gap is formed between the inner and outer pole shoe rings and they are concentrically positioned by the liquid storage ring; one of the inner and outer pole shoe rings is tightly connected to the magnetite, and the other forms an adjustable gap with the upper magnetic conductive ring piece; the permanent magnet is sandwiched between the upper and lower magnetic conductive ring pieces and can move up and down; the lower magnetic conductive ring piece is in contact with the magnetite; the magnetic fluid is injected into the constant gap and the liquid storage ring; the thin-walled barrel-shaped non-magnetic rotor is concentrically inserted into the constant gap, forms a shearing effect on the magnetic fluid after rotation, and converts its viscous damping characteristic into a shear torque to be measured by the torque and speed sensor; the device has the advantages that the test data only contains the viscous damping characteristic of the magnetic fluid, the magnetic fluid will not flow away when the magnetic field is low, and the accuracy is high.
Description
Technical field:
The invention relates to a method and a device for testing viscous damping characteristics of magnetorheological fluid and magnetic fluid (hereinafter referred to as magnetic fluid), in particular to a device for testing the viscous damping characteristics of a magnetic fluid material under the magnetization action of a magnetic field, which is also suitable for the design of a magnetorheological fluid damping vibration attenuation and braking device and is also suitable for the viscosity characteristic test of the magnetic fluid or the magnetic fluid material.
The background technology is as follows:
The magnetic liquid is a magnetic solid-liquid two-phase functional material which is formed by stably dispersing magnetic particles in a certain carrier liquid through a surfactant, and the characteristics of the magnetic liquid, such as the whole form, the microstructure, the viscous damping and the like are constrained and controlled by an externally applied magnetic field, so that the magnetic liquid has very wide application prospect in the aspects of sealing, damping vibration attenuation, electromagnetic filtering, high-quality sound, sensing, braking and the like. The research on viscous damping characteristics of the magnetic liquid in a magnetic field and at different temperatures is particularly important, and is the basis of application research. When the external magnetic field is lower than a certain critical value, the Brownian thermal motion of magnetic particles in the magnetic liquid is dominant, chain-like order is not easy to occur, the viscous damping characteristic of the whole material is the same as that of common fluid, but under the action of the external magnetic field, the magnetic liquid shows extremely strong magnetization and tackifying characteristics, and the magnetization and tackifying characteristics are related to magnetization time. Magnetization tackifying properties are beneficial for damping vibration, braking, etc., but detrimental for sealing and high quality sound, etc. Therefore, the viscous damping characteristic or the change curve of the viscosity characteristic of the magnetorheological fluid or the magnetic fluid at different temperatures along with the strength and time of the externally applied magnetic field needs to be measured, so that the working magnetic fields of different magnetic fluid materials can be determined, and the basis is provided for the optimal design of devices such as sealing, damping and vibration reduction.
The common fluid viscosity test method is not suitable for testing the magnetization viscous damping performance of the magnetic fluid. On the one hand, on the existing viscosity test equipment, a strong magnetic field cannot be conveniently applied to the viscosity test equipment, and even if an external magnetic field is applied, some viscometers which rely on the action of gravity cannot be used because the magnetic force can be larger than the action of gravity. On the other hand, the common method requires a larger amount of liquid sample at a time.
The test method of apparent viscosity of magnetic liquid provided by Chinese patent CN1737531A and CN2802498Y adopts a magnetic liquid sealed close magnetic focusing structure, and the intensity of an externally applied constraint magnetic field is controlled by increasing or reducing the number of permanent magnet blocks in the magnetic focusing structure, so that on one hand, the permanent magnet blocks are inconvenient to replace each time, on the other hand, the change of the constraint magnetic field is discontinuous, the critical working magnetic field cannot be accurately measured, and meanwhile, the patent also does not provide a measurement method of the intensity of the working magnetic field. The measurement method disclosed in chinese patent CN2099316U is an improvement of the conventional kinematic viscosity measurement method, and although the electromagnetic coil is used to realize continuous change of the external magnetic field, it is difficult to achieve and maintain a higher magnetic field strength for a longer time, and a large amount of magneto-hydraulic samples are required and more electric energy is consumed during each measurement, especially a large amount of heat is generated during the operation of the electromagnetic coil, so that it is difficult to control the temperature of the measured sample, and especially it is difficult to realize measurement of low-temperature magnetization viscosity characteristics.
The Chinese patent ZL201010290643.6 and ZL201310463664.7 provide a magnetic liquid magnetization viscosity test method and device which adopts permanent magnets as magnetic sources and restricts magnetic fields to be continuously adjustable, and the magnetic liquid magnetization viscosity test method and device mainly comprises a magnetic conduction fixed ring, a magnetic conduction movable ring (or a magnetic conduction rotor), a permanent magnet ring, a pole shoe ring, a constant gap and an adjustable gap. The magnetic liquid is constrained in a constant cylindrical gap between the magnetic stator ring and the magnetic rotor ring, which constant gap is required to provide a continuously adjustable magnetic field on the one hand, to apply a continuously adjustable magnetization to the magnetic liquid material, and on the other hand, to apply a continuously adjustable shearing action to the magnetic liquid. The speed regulating motor drives the magnetic conduction movable ring (or magnetic conduction rotor) to rotate through the torque and rotation speed testing device and the rotating shaft, so that the material sample in the constant gap is subjected to shearing action, and the viscosity characteristic of the material sample is converted into shearing force and is measured by the torque sensor in a torque mode. Thus, although the problems of adjustable magnetic field strength and low-temperature viscosity test are solved, the disadvantage of the method is that a strong magnetic force acts between the magnetic conduction movable ring (or the magnetic conduction rotor) and the magnetic conduction fixed ring, so that a group of rotating bearings are required to be arranged between the magnetic conduction movable ring and the magnetic conduction fixed ring in order to maintain concentric positioning and relative rotation between the magnetic conduction movable ring and the magnetic conduction fixed ring. In this way, the measured torque is not completely derived from the shear viscosity of the magnetic liquid, and part of the measured torque is formed by the bearing resistance for supporting the rotation of the magnetic conductive moving ring (or the magnetic conductive rotor), and in addition, the magnetic conductive rotor and the supporting bearing thereof still have large rotation inertia force, so that the rotation torque of the system under the condition of no magnetic liquid is measured firstly before the viscosity characteristic of the magnetic liquid is tested, so that the measurement accuracy is greatly reduced as a result of subtracting from the viscosity test data of the magnetic liquid. In addition, when no magnetic field constraint exists, the magnetic liquid can flow away from the constant gap.
The invention comprises the following steps:
The invention aims to provide a method and a device for testing shear viscous resistance, which adopt a permanent magnet as a magnetic source, have a constraint magnetic field which is continuously adjustable from weak to strong, can not flow away when the magnetic field is low, and have test data only containing the magnetic liquid, so that the test precision and convenience can be greatly improved.
The invention discloses a device for testing viscous damping characteristics of magnetic liquid, which mainly comprises a variable speed motor, a torque and rotating speed sensor, an electromagnetic induction coil, a permanent magnet, a thin-wall barrel-shaped rotor, an upper magnetic conduction sheet, a lower magnetic conduction sheet, an inner pole shoe ring, an outer pole shoe ring, a magnetizer and other parts, and is characterized in that a constant gap is formed between the outer diameter of the inner pole shoe ring and the inner diameter of the outer pole shoe ring, and the constant gap is concentrically fastened and positioned through a liquid storage ring; the liquid storage ring is made of non-magnetic materials such as titanium, aluminum, copper, stainless steel, plastics and the like, one of the inner pole shoe ring and the outer pole shoe ring is connected with the magnetizer, the other one of the inner pole shoe ring and the outer pole shoe ring is connected with the upper magnetizer to form an adjustable gap, the permanent magnet is clamped between the upper magnetizer and the lower magnetizer to form a movable magnetic source and can move up and down, the lower magnetizer is contacted with the magnetizer and can move up and down relatively, the magnetic liquid is injected into the constant gap and the liquid storage ring, the thin-wall barrel-shaped rotor is made of non-magnetic materials (such as titanium, aluminum, copper, stainless steel, plastics and the like), the upper end of the thin-wall barrel-shaped rotor is concentrically connected with the torque sensor and the rotating speed sensor, the lower end of the thin-wall barrel-shaped rotor is inserted into the constant gap and concentrically positioned with the constant gap, and the adjustable motor is concentrically connected with the torque sensor and the rotating speed sensor. The electromagnetic induction coil is arranged below the liquid storage ring and is connected with the magnetic flowmeter.
When the magnetic flux sensor works, the movable permanent magnet source applies an adjustable magnetic field to the magnetic liquid in the constant gap through the upper magnetic conducting ring piece, the adjustable gap, the inner pole shoe ring, the outer pole shoe ring, the magnetic conducting body and the lower magnetic conducting ring piece, the size of the adjustable gap is adjusted through the up-down movement of the movable magnetic source, so that the size of the magnetic field in the constant gap is adjusted, and the change of the magnetic field is measured through the electromagnetic induction coil and the fluxgraph. When the movable magnetic source moves downwards, and a closed magnetic loop is formed between the upper and lower magnetic conducting ring sheets and the magnetic conducting body, the magnetic field in the constant gap reaches the minimum value, and the magnetic liquid in the constant gap flows into the liquid storage ring below the magnetic conducting ring. The speed-adjustable motor drives the thin-wall barrel-shaped rotor to rotate through the torque and rotation speed testing device, so that a material sample in a constant gap is subjected to shearing action, and the viscous damping characteristic of the material sample is converted into shearing force and is measured by the torque sensor in a torque mode.
The magnetic liquid shearing device has the advantages that the shearing effect on the magnetic liquid in the constant gap is realized through the relative rotation between the non-magnetic barrel-shaped thin-wall rotor and the fixed inner pole shoe ring and the fixed outer pole shoe ring, but not the relative rotation between the inner pole shoe ring and the outer pole shoe ring. Therefore, the interference of bearing resistance between the inner pole shoe ring and the outer pole shoe ring on the test result is avoided, the inertia of the rotor can be greatly reduced, the test precision is further improved, and in addition, when the constraint magnetic field is 0, the magnetic liquid cannot flow away.
Description of the drawings:
FIG. 1 is a schematic diagram showing the structure of a device for testing the viscous characteristics of a magnetic liquid in an intermediate state according to embodiment 1
FIG. 2 is a schematic diagram showing the structure of the device for testing the viscosity characteristics of a magnetic liquid in a state in which the constant gap magnetic field of the embodiment 1 tends to be 0, FIG. 3 is a schematic diagram showing the structure of the device for testing the viscosity characteristics of a magnetic liquid in a state in which the constant gap magnetic field of the embodiment 1 is at a maximum value, and FIG. 4 is a schematic diagram showing the principle of the embodiment 1
FIG. 5 is a schematic diagram showing the structure of a device for testing the viscous characteristics of a magnetic liquid according to embodiment 2 with a high-low temperature box
FIG. 6 is a schematic view showing the structure of embodiment 3 in an intermediate state
FIG. 7 is a schematic diagram showing a device for testing viscosity characteristics of a magnetic liquid by adjusting an adjustable gap using a hydraulic element according to embodiment 4
The magnetic field generator comprises a 1-thin-wall barrel-shaped rotor, 2-magnetic liquid, 3-constant gap, 4-outer pole shoe ring, 5-adjustable gap, 6-electromagnetic induction coil, 7-upper magnetic conducting sheet, 8-permanent magnet ring, 9-lower magnetic conducting sheet, 10-magnetic conductor, 11-magnetic leakage loop, 12-magnetizing loop, 13-liquid storage ring, 14-inner pole shoe ring, 15-torque and rotating speed sensor, 16-adjustable motor, 17-rotating shaft, 18-high-low temperature box, 19-hydraulic element and 20-base.
The specific embodiment is as follows:
embodiment 1 as shown in figure 1, the device for testing viscous damping characteristics of magnetic liquid mainly comprises a thin-wall barrel-shaped rotor 1, magnetic liquid 2, a constant gap 3, an outer pole shoe ring 4, an adjustable gap 5, an electromagnetic induction coil 6, an upper magnetic conducting ring piece 7, a permanent magnet ring 8, a lower magnetic conducting ring piece 9, a magnetic conductor 10, a magnetic leakage loop 11, a magnetizing loop 12, a liquid storage ring 13, an inner pole shoe ring 14, a torque sensor 15, an adjustable speed motor 16 and other components, and is characterized in that the constant gap 3 is formed between the outer diameter of the inner pole shoe ring 14 and the inner diameter of the outer pole shoe ring 4, and the constant gap is concentrically positioned through the liquid storage ring 13; the liquid storage ring 13 is made of nonmagnetic materials such as titanium, aluminum, copper, stainless steel, plastics and the like, one of the inner pole shoe ring 14 and the outer pole shoe ring 4 is connected with the magnetizer 10, the other one of the inner pole shoe ring and the outer pole shoe ring is connected with the upper magnetic conducting ring sheet 7 to form an adjustable gap 5, the permanent magnet 8 is clamped between the upper magnetic conducting ring sheet 7 and the lower magnetic conducting ring sheet 9 to form a movable magnetic source and can move up and down, the lower magnetic conducting ring sheet 9 is contacted with the magnetizer 10 and can move up and down relatively through threaded connection, the magnetic liquid 2 is injected into the constant gap 3 and the liquid storage ring 13, the thin-wall barrel-shaped rotor 1 is made of nonmagnetic titanium, the upper end of the thin-wall barrel-shaped rotor is concentrically connected with the torque and the rotating speed sensor 15, the lower end of the thin-wall barrel-shaped rotor is inserted into the middle of the constant gap 3 and is concentrically positioned with the constant gap 3, and the speed regulating motor 16 is concentrically connected with the torque and the rotating speed sensor 15. The electromagnetic induction coil 6 is arranged below the liquid storage ring 13 and is connected with a fluxgraph. When the magnetic field sensor works, the permanent magnet 8 applies an adjustable magnetic field to magnetic liquid in the constant gap 3 through a magnetizing loop 12 formed by the upper magnetic conduction ring sheet 7, the adjustable gap 5, the inner pole shoe ring 14, the outer pole shoe ring 4, the magnetizer 10, the lower magnetic conduction ring sheet 9 and the like, and the size of the adjustable gap 5 is adjusted by driving the upper magnetic conduction ring sheet 7, the lower magnetic conduction ring sheet 9 and a movable magnetic source formed by the sheet 9 and the permanent magnet 8 to move up and down through threads between the lower magnetic conduction ring sheet 9 and the magnetizer 10, so that the size of a magnetic field in the constant gap 3 is adjusted, and the change amount of the magnetic field is measured through the electromagnetic induction coil 6 and the fluxgraph. When the upper magnetic conducting ring sheet 7 of the movable magnetic source is contacted with the outer pole shoe ring 4, the size of the adjustable gap 5 is changed to 0 as shown in figure 2, the magnetic field in the constant gap 3 reaches the maximum value, and when the movable magnetic source moves downwards and forms a closed magnetic loop between the permanent magnet ring 8, the upper magnetic conducting ring sheet 7, the lower magnetic conducting ring sheet 9 and the magnetic conducting body 10, the magnetic field in the constant gap 3 reaches the minimum value as shown in figure 3, and the magnetic liquid flows into the liquid storage ring 13 below the permanent magnet ring. The speed regulating motor 16 drives the nonmagnetic thin-wall barrel-shaped rotor 1 to rotate through the torque and rotation speed testing device 15, so that the magnetic liquid material sample 2 in the constant gap 3 is sheared, and the viscous damping characteristic of the magnetic liquid material sample 2 is converted into shearing force and is measured by the torque sensor 15 in a torque mode.
As shown in fig. 4, assuming that the wall thickness of the non-magnetic bucket type thin-walled rotor 1 can be negligible, the viscous damping characteristics of the final magnetic liquid 2 material sample are approximately given by:
Wherein the method comprises the steps of
Η is magnetization viscous damping characteristic (viscosity characteristic for magnetic liquid) of a material sample, δ=gl is axial constant gap size, R is non-magnetic barrel type thin-wall rotor radius, h is axial constant gap cylinder height, ω is rotation angular speed of a magnetic conduction moving ring, M is rotation torque of the magnetic conduction moving ring, τ is shear stress applied to the material sample,For velocity gradient, F is torsional force and A is constant gap cylindrical surface area.
The magnetic flux on the magnetic circuit 12 is measured by the induction coil and the magnetometer associated therewith and converted by the equation to a magnetic flux density through the material sample.
B is the constant axial gap 3 flux density, phi is the total flux on the magnetic loop 12, N is the number of turns of the induction coil 6, and phi t is the fluxgate measurement.
Example 2 as shown in fig. 5, the device for testing viscous damping characteristics of a magneto-hydraulic fluid is different from the device of examples 1,2 or 3 in that the testing device is placed in a high-low temperature box 18 from below the thin-wall barrel-shaped rotor 1, the thin-wall barrel-shaped rotor 1 passes through a hole at the top of the high-low temperature box 18 through a rotating shaft 17 and is concentrically connected with an external torque and rotating speed sensor 15, and the device is mainly used for testing the characteristics of the high-low Wen Nianwen.
Example 3 is shown in fig. 6, and the device for testing viscous damping characteristics of magnetic liquid is shown in fig. 4, and compared with example 1, the device has the difference that the outer pole shoe ring 4 is connected with the magnetizer 10, and an adjustable gap 5 is formed between the inner pole shoe ring 14 and the magnetizer 7.
In example 4, as shown in fig. 7, the device for testing viscous damping characteristics of magnetic liquid is different from that in example 3 in that a hydraulic non-member 19 and a base 20 are disposed under the lower magnetic conductive ring sheet, and the up-down relative movement between the lower magnetic conductive ring sheet 9 and the magnetic conductive body 10 is driven by a hydraulic member 19.
And (5) testing the magnetic fluid viscous damping intrinsic viscosity.
Claims (7)
1. A magnetic liquid viscous damping characteristic testing device mainly comprises a thin-wall barrel-shaped rotor (1), an outer pole shoe ring (4), an electromagnetic induction coil (6), an upper magnetic conduction ring piece (7), a permanent magnet ring (8), a lower magnetic conduction ring piece (9), a magnetic conduction body (10), a liquid storage ring (13), an inner pole shoe ring (14), a torque sensor (15) and an adjustable speed motor (16), and is characterized in that a constant gap (3) is formed between the outer diameter of the inner pole shoe ring (14) and the inner diameter of the outer pole shoe ring (4) and is fastened and positioned through a liquid storage ring (13) in a concentric manner, one of the inner pole shoe ring (14) and the outer pole shoe ring (4) is fastened and connected with the magnetic conduction body (10), the other one is fastened and connected with the upper magnetic conduction ring piece (7) to form an adjustable gap (5), the permanent magnet ring (8) is clamped between the upper magnetic conduction ring piece (7) and the lower magnetic conduction ring piece (9) to form a movable magnetic source, and can move up and down, the lower magnetic conduction ring piece (9) is contacted with the magnetic conduction body (10) and can move relatively up and down, the magnetic liquid (2) is injected into the constant gap (3) and the inner diameter of the outer pole shoe ring (4) to form a concentric gap, and the inner magnetic liquid (3) is inserted into the inner barrel-shaped rotor (1) to form a concentric gap, and the constant torque sensor (15) is inserted into the magnetic liquid container (1);
The shearing action of the magnetic liquid (2) in the constant gap (3) is realized through the relative rotation between the thin-wall barrel-shaped rotor (1) and the fixed inner pole shoe ring (14) and the fixed outer pole shoe ring (4).
2. A device for testing the viscous damping characteristics of a magneto-hydraulic fluid according to claim 1, characterized in that the thin-walled barrel rotor (1) is made of a non-magnetic material.
3. A device for testing the viscous damping characteristics of a magneto-fluid according to claim 1, characterized in that the reservoir ring (13) is made of a non-magnetic material.
4. A device for testing the viscous damping characteristics of a magneto-hydraulic fluid according to any one of claims 1, 2 or 3, characterized in that the relative up-and-down movement between the lower magnetically conductive ring (9) and the magnetically conductive body (10) is driven by means of a screw thread.
5. A device for testing the viscous damping characteristics of a magneto-hydraulic fluid according to any one of claims 1, 2 or 3, characterized in that the up-down relative movement between the lower magnetically conductive ring (9) and the magnetically conductive body (10) is driven by means of a hydraulic element (19).
6. A device for testing the viscous damping characteristics of a magneto-hydraulic fluid according to any one of claims 1, 2 or 3, characterized in that the electromagnetic coil for testing the magnetic flux density is attached to the underside of the reservoir ring (13).
7. A device for testing the viscous damping characteristics of a magnetic fluid according to any one of claims 1,2 or 3, wherein the thin-walled barrel-shaped rotor (1) is arranged in a high-low temperature box (18) from below, and penetrates out of a hole at the top of the high-low temperature box (18) through a rotating shaft (17) to be concentrically connected with an external torque sensor (15) for testing the viscous temperature characteristics of the magnetic fluid.
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| CN121089542A (en) * | 2025-06-12 | 2025-12-09 | 深圳市中图仪器股份有限公司 | A scanning probe with an elastic layer and a coordinate measuring machine |
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|---|---|---|---|---|
| CN101963567A (en) * | 2010-09-21 | 2011-02-02 | 中国兵器工业第五二研究所 | Method and device for testing magnetic viscosity of magnetic liquid |
| CN104807747A (en) * | 2015-04-25 | 2015-07-29 | 孙美娜 | Device for detecting force transmission characteristics of double-side shear type magnetorheological fluid |
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| CN110160914A (en) | 2019-08-23 |
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