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WO1992000469A1 - Procede et appareil de commande d'operations au moyen de cristaux liquides et equipement de mesure pour cristaux liquides - Google Patents

Procede et appareil de commande d'operations au moyen de cristaux liquides et equipement de mesure pour cristaux liquides Download PDF

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Publication number
WO1992000469A1
WO1992000469A1 PCT/JP1991/000881 JP9100881W WO9200469A1 WO 1992000469 A1 WO1992000469 A1 WO 1992000469A1 JP 9100881 W JP9100881 W JP 9100881W WO 9200469 A1 WO9200469 A1 WO 9200469A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
fluid
container
operation control
liquid crystalline
Prior art date
Application number
PCT/JP1991/000881
Other languages
English (en)
Japanese (ja)
Inventor
Takuri Sakurai
Tadahiro Asada
Original Assignee
Toyo Tire & Rubber Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP26583290A external-priority patent/JPH04191511A/ja
Application filed by Toyo Tire & Rubber Co., Ltd. filed Critical Toyo Tire & Rubber Co., Ltd.
Publication of WO1992000469A1 publication Critical patent/WO1992000469A1/fr

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Classifications

    • 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
    • G01N11/16—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring damping effect upon oscillatory body
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/001—Electrorheological fluids; smart fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D37/00—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive
    • F16D37/008—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive the particles being carried by a fluid, to vary viscosity when subjected to electric change, i.e. electro-rheological or smart fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/26—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper characterised by adjusting or regulating devices responsive to exterior conditions
    • F16F13/30—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper characterised by adjusting or regulating devices responsive to exterior conditions comprising means for varying fluid viscosity, e.g. of magnetic or electrorheological fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/16—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material
    • F16F15/161—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material characterised by the fluid damping devices, e.g. passages, orifices

Definitions

  • the present invention relates to a method and an apparatus for controlling an operation using a liquid having a liquid crystal property, and an apparatus for measuring the electric rheological properties of the liquid crystal liquid.
  • a two-chamber engine mount having a hydraulic damping performance (Japanese Patent Laid-Open No. 60-108488) is formed by a rubber wall supporting the engine and a rubber film under the rubber wall.
  • a partition plate is provided in the chamber, an orifice is formed in the partition plate, a counter electrode is provided in the orifice, and an ER fluid is sealed in the chamber.
  • the electrodes when the electrodes are energized, the viscosity of the ER fluid increases and the flow velocity of the orifice decreases, thereby obtaining damping performance according to the load imposed by the engine.
  • the use of ER fluid for clutches, valves, vibration generators, etc. has been proposed.
  • Ordinary ER fluids contain a certain amount of water in the dispersion system, and the dispersed particles tend to absorb moisture, so that the ER characteristics are likely to change and the electrical insulation is reduced by increasing the water content.
  • application of a high voltage may cause dielectric breakdown or breakdown of the device itself.
  • An object of the present invention is to solve such a problem of the prior art, and to provide an operation control method and apparatus using a fluid that can be operated at a low voltage and has stable operation characteristics.
  • Another object of the present invention is to provide an apparatus that enables dynamic measurement of the electro-rheological properties of a fluid related to the operation control.
  • the first object of the present invention is to seal a fluid having a liquid crystal property in a storage section provided with one or a plurality of narrow portions, and apply an electric field to the narrow portion to reduce the rheological properties of the fluid.
  • the operation control method using a liquid crystal fluid characterized by changing the resistance to movement in the narrow portion and controlling mechanical work, and one or more It is characterized by comprising a storage section provided with a narrow portion, a fluid having liquid crystallinity sealed in the storage section, and electrodes provided in the narrow portion and facing each other to form a pair. This is achieved by an operation control device using a liquid crystalline fluid.
  • the second object of the present invention is to provide a container having an open upper surface for accommodating a liquid having liquid crystallinity, a support for supporting the container, and a small space between the container inner surface and the container.
  • An insertion member that can be inserted, and the insertion member is inserted into the container.
  • a vibrator for vertically vibrating the container, a vibration detector for detecting vibration of the container caused by the vibration, and a liquid crystal fluid by the vibration.
  • Liquid crystal flow characterized by comprising: a load sensor for detecting a force acting on the insertion member through the load member; and a voltage application device for applying a voltage between the container and the insertion member. This is achieved by a device for measuring the electrical rheological properties of the body.
  • Typical examples of Leo mouth-like properties include the elastic modulus, and the following.
  • F is the frequency of the electric field (H z).
  • Liquid crystal is a substance composed of organic rod-shaped molecules. It is a substance that indicates an intermediate state between an irregular state as seen in the body.
  • the definition of liquid crystal is that the long-range order of molecules is lost, but the long-range order of molecules is maintained.
  • a liquid crystal fluid can sufficiently change its rheological properties such as elastic modulus at a low voltage of, for example, 200 VZ mm to 300 V V ⁇ . Practical application is easy.
  • a shear modulus of 0.09 dyn Zcrf without an electric field is applied at 520 V.
  • the shear modulus of 99 dyn Z cii is shown.
  • the liquid crystalline fluid changes its rheological properties according to the electric field strength, and it is not always necessary for the current to flow in the fluid like the ER fluid. Therefore, the liquid crystal fluid does not need to be brought into direct contact with the electrode, for example, a glass plate can be interposed between the liquid crystal fluid and the electrode, and stability can be obtained in both material and operation.
  • a glass plate can be interposed between the liquid crystal fluid and the electrode, and stability can be obtained in both material and operation.
  • the change in rheological properties such as the elastic modulus is based on the orientation state of the liquid crystalline fluid, a slight change in voltage can cause a sharp change. Therefore, the influence of a transient current or the like generated at the time of high voltage ONZOFF hardly occurs, and stable and reliable control can be performed.
  • liquid crystalline fluid is a liquid mixture or solution, stable operation can be obtained without precipitation.
  • Liquid crystalline fluids are inherently materials with good electrical insulation, and the voltage required for operation is low, so that problems with dielectric breakdown are unlikely to occur.
  • the rheological properties of the liquid crystalline liquid show temperature dependence ⁇ ⁇ frequency dependence of the mechanical load, and changes in the rheological properties due to an electric field depending on the temperature conditions and the load frequency. May not be enough. In this case, the change in the resistance to the movement of the liquid crystalline fluid in the narrow portion may not be sufficient, and the mechanical work may not be properly controlled.
  • the frequency of the electric field applied to the narrow part to an appropriate relationship with the frequency of the mechanical load on the controlled part, for example, the same frequency, such temperature dependence and frequency dependence can be reduced.
  • the control of mechanical work can be more precise or broader.
  • the electric field applied to the narrow part is It is desirable to follow. This is because the permissible amount of impurities for the functioning of the liquid crystalline fluid is larger in the case of an AC electric field than in the case of a DC electric field, and the operation stability is better.
  • an alternating electric field having a high frequency for example, from 500 Hz to 5 kHz, there is an advantage that the service life of the liquid crystalline fluid is prolonged. As described above, it is desirable to set the control conditions in consideration of the ambient temperature, mechanical load, operation stability, service life, and the like.
  • An electrorheological property measuring apparatus is characterized in that a liquid crystal fluid to be measured is accommodated in a minute gap between a container and an insertion member, and a predetermined electric field is applied to the gap.
  • the structure detects the vibration state of the container and the force acting on the insertion member. Therefore, the dynamic rheological properties of a liquid crystalline fluid at a given electric field can be known from the force propagation characteristics in the minute gap. This makes it possible to know the voltage dependence of the storage shear modulus G, tan, and other mechanical quantities that cannot be obtained from static property measurements.
  • it is important to grasp the dynamic properties corresponding to the operating state. Is very significant. Examples of liquid crystalline substances that can be used in the method and apparatus of the present invention are as follows.
  • Fig. 5 (a) As shown in Fig. 5 (a), it has a repeating structure of mesogen (rigid group necessary for liquid crystal formation) and spacer (flexible bent chain).
  • mesogen rigid group necessary for liquid crystal formation
  • spacer flexible bent chain
  • polyester polyether, polycarbonate, etc. are included.
  • a comb polymer having a flexible main chain and side chains containing mesogen As shown in Fig. 5 (b), a comb polymer having a flexible main chain and side chains containing mesogen.
  • an amorphous polymer such as a vinyl-based polymer or polysiloxane is used. * Rigid main chain polymer
  • a lyotropic liquid crystalline polymer using polyglutamic acid ester, cellulose derivative, and polyisocynate as macromolecular species As shown in Fig. 5 (c), a lyotropic liquid crystalline polymer using polyglutamic acid ester, cellulose derivative, and polyisocynate as macromolecular species.
  • Surfactants such as sodium dodecyl sulfate
  • FIG. 1A is a longitudinal sectional view of an example of an engine mount equipped with the operation control device according to the present invention
  • Figure 1B is a partial plan view
  • FIG. 2 shows a shot equipped with the operation control device according to the present invention.
  • a longitudinal section of the quarbsorber (Damba) is shown.
  • FIG. 3 is a longitudinal sectional view of a clutch equipped with the operation control device according to the present invention.
  • FIG. 4 is a longitudinal sectional view of a biplane equipped with the operation control device according to the present invention.
  • FIG. 5 is an explanatory diagram of an example of a liquid crystalline fluid
  • FIG. 6 is a perspective view schematically showing one embodiment of the measuring device of the present invention.
  • FIG. 7 is a graph showing the properties of the liquid crystalline fluid measured using the measuring device of the present invention.
  • Figure 1A is an example of a two-chamber engine mount.
  • (1) is the engine support plate, which is connected to the rubber wall (2).
  • the lower part of the rubber wall (2) is continuous with the rubber film (3), and the two form a chamber (4).
  • the chamber (4) is partitioned by a partition (5) having an orifice (6).
  • the rubber wall (2) is surrounded by an outer wall (7), the rubber membrane (3) is surrounded by a cap (9) via an air chamber (8), and the cap (9) is a car chassis. Is connected to the network.
  • the chamber (4) contains a liquid crystal liquid (A).
  • the orifices (6) are connected to the opposing electrodes (61) and (6) as shown in Fig. 1B. 2) and an insulating member (63) between them.
  • the electrodes (61) and (62) are connected to a power source (not shown). When mounted on a car, this engine mount acts to absorb the vibration of the engine by deformation of the rubber wall (2), but this involves a change in the volume of the room (4). At that time, the liquid crystalline fluid in the chamber (4) moves up and down the partition (5) through the orifice (6), and the flow resistance at that time makes vibration absorption more efficient. Therefore, when the voltage applied to the electrodes (61) and (62) is adjusted to 0 NZO FF or the applied voltage is adjusted, the rheological properties such as the elastic modulus of the liquid crystalline fluid change. The flow resistance when passing through the orifice changes.
  • the vibration damping characteristics can be changed, and efficient vibration absorption according to the vibration state can be performed.
  • the frequency of the engine and the frequency of the voltage applied to the electrodes (61) and (62) to an appropriate relationship, for example, the same, the change in the rheological properties of the liquid crystalline fluid can be reduced.
  • effective vibration absorption can be achieved over a wide range of temperature and frequency, or at a lower applied voltage.
  • multiple orifices are provided and the voltage is controlled separately to adjust the total amount of orifice passing through in more detail. You can also.
  • FIG. 2 shows an example of application of the present invention to a shock absorber for automobiles (damper).
  • This absorber has an outer cylinder (11) and an inner cylinder (12), and is connected to each other by a rubber cylinder (13) so as to be mutually movable.
  • a rubber film (14) is provided at the lower part of the inner cylinder (1 2), and a liquid crystal fluid (A) is sealed in the upper part and the outer cylinder (11).
  • An orifice (15) is formed at the upper end of the inner cylinder (12).
  • the orifice is composed of electrodes (16) and (17) at the edge, and these electrodes are connected to a power source (not shown) by wires.
  • the inner cylinder and the outer cylinder move with the deformation of the rubber film (14).
  • the resistance of the fluid passing through the orifice acts on the vibration.
  • the electrodes (16) and (17) are energized, the elastic modulus of the liquid crystalline fluid increases, the flow resistance through the orifice increases, and as a result, the vibration damping characteristics change. Therefore, by controlling the energization, it is possible to obtain an appropriate vibration damping characteristic compatible with the impact mitigation action of the spring. For example, when a large street hammer is applied, the electrodes are de-energized to reduce the flow resistance at the orifice, effectively mitigating the street hammer by springs, and immediately after that, the electrodes are energized to flow. Control to increase resistance and accelerate vibration damping Can be. Also in this example, it is of course possible to provide a plurality of orifices and separately control the voltage so that the total passing amount of the orifices can be adjusted in more detail.
  • FIG. 3 shows an application example of the present invention to a clutch.
  • This clutch includes an input side clutch plate (21) connected to the input shaft (23) and an output side clutch plate (22) connected to the output shaft (24).
  • the output-side clutch plate (22) has a disk shape
  • the input-side clutch plate (21) has a hollow structure surrounding the disk
  • the distal end side of the output shaft (24) is provided with a sealing member (25). Liquid-tight.
  • the gap between the input side clutch plate (22) and the output side clutch plate (21) forms a planar narrow portion, in which the liquid crystalline fluid (A) is sealed.
  • the input-side clutch plate (22) and the output-side clutch plate (21) are connected to a power source (not shown) via a lead (27) via an input shaft (23) and an output shaft (24), respectively.
  • This clutch acts as a fluid clutch utilizing the liquid crystalline fluid.
  • the two clutch plates (21) and (22) also act as electrodes, and if a voltage is applied during this period, the rheological properties such as the elasticity of the liquid crystalline fluid change, so that both clutch plates are used.
  • the resistance to relative rotational movement changes, and the transmission of rotational force Can be controlled. It is also possible to increase the number of the clutch plates connected to the input / output shaft and to operate each of them as an electrode for more detailed control.
  • FIG. 4 shows an example in which the present invention is applied to a vibrator.
  • the vibrator includes a cylinder (31), a piston (32) slidably supported through the cylinder, and valves (33), (3) arranged in the cylinder (31). 4), (35) and (36) are provided.
  • These valves are composed of multi-layered electrode plates concentric with the piston (32), and the mating layers in each valve are wired so as to be opposite electrodes. Each gap between the layered electrode plates is a narrow portion through which a fluid can pass in the axial direction.
  • the valves (33) and (36) at both ends are fixed to the cylinder (31), and the valves (34) and (35) between them are fixed to the piston (32).
  • the cylinder (31) has a supply port (37) at a position corresponding to the position between the valves (34) and (35), and a discharge port (38) outside the valves (33) and (36) in the axial direction. It has. From the supply port (37), a liquid crystalline fluid is pumped into the cylinder. In this state, when the valves (33) and (35) are energized, the flow resistance increases due to a change in the rheo-original properties, such as an increase in the elastic modulus of the liquid crystalline fluid, between the electrode layers of these valves. And As a result, the piston (32) moves to the right due to the pumping force of the liquid crystalline fluid.
  • each operation is controlled using a fluid having a liquid crystal property, so that a stable operation at a low voltage can be obtained as described above.
  • the present invention can exert the above-described effects by using a liquid crystalline fluid with respect to various methods and apparatuses which have conventionally used an ER fluid.
  • a liquid crystalline fluid with respect to various methods and apparatuses which have conventionally used an ER fluid.
  • the following is a list of examples to which the present invention can be applied (the parentheses indicate publications describing methods or apparatuses using ER fluid).
  • FIG. 6 shows an apparatus for measuring the electrical properties of a liquid crystalline fluid.
  • (101) is a container having an open top for accommodating a liquid having a liquid crystal property, and the container is supported by a support (102).
  • the insertion member (103) is inserted into the container (101) at a small interval from the inner surface of the container, and the insertion member is supported by the hanging portion (104) in the inserted state. It has been.
  • a vibration exciter (105) for vertically vibrating the support base together with the container (101) is connected to the support base (102), and the insertion member (103) is connected to the support member (103).
  • a load sensor (106) for detecting a force acting on the input member is connected.
  • the output part of the high voltage generator (107) is connected to the container (101), and the input member (103) is electrically grounded via the suspension part (104).
  • a potential difference is generated between the container (101) and the input member (103) by the output from the high-voltage generating device (107).
  • at least the conductive material is provided on the inner surface of the container (101) and the outer surface of the insertion member (103).
  • a vibration detector (108) is connected to the support (102) so that the actual vibration state of the container (101) can be detected.
  • a computer (109) is further connected to the load sensor (106), the high-voltage generator (107), and the vibration detection device (108). A signal is sent.
  • the computer (109) calculates the storage shear modulus G ', the loss shear modulus, tan (5. ⁇ ', and other kinetic parameters) from the transmitted signal. It is as follows.
  • the vibrator (105) based on the output from the load sensor (106), the high voltage generator (107) and the vibration detecting device (108) and the signal sent according to the detected value, the vibrator (105)
  • the control signal can be sent from the computer (109) to the vibrator (105) so that it can be controlled.
  • the dimensions of the container (101) and the insertion member (103), and the characteristics of the vibrator (105) and the high voltage generator (107) are exemplified below.
  • Alternating frequency 0.1mHz ⁇ : 1.2MHz
  • the introduction member (103) has a minute gap of, for example, about 0.5 mm between the inner surface of the container (101) and the gap, and the gap is filled with a liquid crystalline fluid.
  • a shear force acts on the liquid crystal fluid between the inner wall of the container (101) and the outer surface of the insertion member (103).
  • a force acts on the insertion member (103) based on the viscoelasticity of the liquid crystal fluid against shearing due to the vibration of the container (101), and the force is detected by the load sensor (106).
  • a signal corresponding to the output of the vibrator (105) and the detection values of the load sensor (106) and the vibration detector (108) is sent to the computer (109), and the G- and G- G ", tan 5 and other mechanical quantities are calculated.
  • the desired voltage difference and its applied frequency are calculated by the high voltage generator (107). If a voltage is applied between the container (101) and the insertion member (103) while changing the number, the electric field dependence of the above value can be obtained.
  • MERCK's mixed liquid crystal N.P.-289 p-type nematic liquid crystal (m ⁇ ⁇ 0) composed mainly of cyanobiphenyl, showing liquid crystal state at room temperature
  • the frequency of the shaker was 25 Hz
  • the displacement amplitude was 10 O / im
  • the electrode spacing was 0.5 mm
  • the room temperature was 24 ° C.
  • a simple shear deformation and a voltage were applied to the sample between the steps (1) and (2), and the electric field dependence of the liquid crystalline fluid was measured.
  • FIG. 7 shows a graph of the voltage dependence of the dynamic viscoelastic properties obtained from the measurement results, that is, the storage shear modulus G ′, the loss shear modulus and ta ⁇ ⁇ . From this graph, it can be seen that G 'and ta ⁇ 5 show a unique voltage dependence, but G "shows little change. That is, G' shows little change at low voltage. not an increase from around 2 X 1 0 2 0. 5 mm is observed et been, rapidly ⁇ at 3. 5 1 0 2 V / 0. 5 mm. further increasing the voltage, 5. 5 X 1 0 2 V / 0.5 mm The voltage decreases sharply at this point, and shows little change at higher voltages. ta ⁇ 5 shows a similar change, reversing the trend of increase and decrease.
  • the fact that there is little change at a low voltage, and that there is a sudden and significant change in rheological properties only in a certain voltage range means that the liquid crystalline fluid is operated by applying an electric field to the liquid crystal fluid.
  • control it means that control can be performed at a low level of voltage first, and then that operation can be changed with a slight voltage change.
  • a good control system can be configured.

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Abstract

Un récipient contenant une ou plusieurs parties rétrécies est rempli de cristaux liquides et scellé. On fait varier les propriétés rhéologiques des cristaux liquides en appliquant un champ électrique à la partie rétrécie du récipient. Il en résulte une variation de la résistance à l'écoulement des cristaux liquides au niveau de la partie rétrécie, de sorte qu'on peut commander le travail mécanique en utilisant les cristaux liquides. Cette opération est effectuée en toute stabilité à une tension faible. Un instrument est en outre prévu pour asssurer des mesures dynamiques des propriétés électrorhéologiques d'un fluide.
PCT/JP1991/000881 1990-06-29 1991-06-29 Procede et appareil de commande d'operations au moyen de cristaux liquides et equipement de mesure pour cristaux liquides WO1992000469A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP17366290 1990-06-29
JP2/173662 1990-06-29
JP2/262236 1990-09-29
JP26223690 1990-09-29
JP2/265832 1990-10-02
JP26583290A JPH04191511A (ja) 1990-06-29 1990-10-02 流体による動作制御方法及び装置

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WO1992000469A1 true WO1992000469A1 (fr) 1992-01-09

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0567649A4 (fr) * 1991-07-24 1993-07-28 Tonen Corp Fluide electrovisqueux.
AU648474B1 (en) * 1992-09-28 1994-04-21 Fujikura Ltd. Fluid clutch device
US6484566B1 (en) * 2000-05-18 2002-11-26 Rheologics, Inc. Electrorheological and magnetorheological fluid scanning rheometer
RU2204107C2 (ru) * 2001-02-19 2003-05-10 Общество с ограниченной ответственностью "Научно-производственное объединение специальных материалов" Бронезащита от пуль со стальным сердечником
CN110159863A (zh) * 2019-06-04 2019-08-23 北京石油化工学院 一种基于主动控制的管道磁流变阻尼器

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JPS55146025A (en) * 1979-03-05 1980-11-14 Fresenius Eduard Dr Method and device for measuring viscoelasticity of fluid
JPS56129839A (en) * 1980-03-17 1981-10-12 Ricoh Co Ltd Ink viscosity detector for ink jet recorder
JPS649021A (en) * 1987-07-02 1989-01-12 Nissan Motor Controlled type vibration isolating device
JPS6426043A (en) * 1987-07-20 1989-01-27 Nissan Motor Control type antivibration device
JPH023711A (ja) * 1987-10-21 1990-01-09 Univ Michigan 電界反応性流体
EP0394005A1 (fr) * 1989-04-19 1990-10-24 Btg International Limited Fluide électrorhéologique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55146025A (en) * 1979-03-05 1980-11-14 Fresenius Eduard Dr Method and device for measuring viscoelasticity of fluid
JPS56129839A (en) * 1980-03-17 1981-10-12 Ricoh Co Ltd Ink viscosity detector for ink jet recorder
JPS649021A (en) * 1987-07-02 1989-01-12 Nissan Motor Controlled type vibration isolating device
JPS6426043A (en) * 1987-07-20 1989-01-27 Nissan Motor Control type antivibration device
JPH023711A (ja) * 1987-10-21 1990-01-09 Univ Michigan 電界反応性流体
EP0394005A1 (fr) * 1989-04-19 1990-10-24 Btg International Limited Fluide électrorhéologique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0567649A4 (fr) * 1991-07-24 1993-07-28 Tonen Corp Fluide electrovisqueux.
US5387370A (en) * 1991-07-24 1995-02-07 Tonen Corporation Electroviscous fluid
AU648474B1 (en) * 1992-09-28 1994-04-21 Fujikura Ltd. Fluid clutch device
US6484566B1 (en) * 2000-05-18 2002-11-26 Rheologics, Inc. Electrorheological and magnetorheological fluid scanning rheometer
US6598465B2 (en) * 2000-05-18 2003-07-29 Rheologics, Inc. Electrorheological and magnetorheological fluid scanning rheometer
RU2204107C2 (ru) * 2001-02-19 2003-05-10 Общество с ограниченной ответственностью "Научно-производственное объединение специальных материалов" Бронезащита от пуль со стальным сердечником
CN110159863A (zh) * 2019-06-04 2019-08-23 北京石油化工学院 一种基于主动控制的管道磁流变阻尼器
CN110159863B (zh) * 2019-06-04 2020-12-01 北京石油化工学院 一种基于主动控制的管道磁流变阻尼器

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