ELECTRORHEOLOGICAL CLUTCH PDF

An electrically conductive input drive assembly 1 comprises a cylindrical drive coupling member 3 that surrounds the cylindrical driven coupling member 4 with a cylindrical space defined therebetween. A permanent magnet 5 is formed in an end face of the drive coupling member 3 on the axis of rotation of the drive 1 and driven 2 assemblies. The cylindrical driven coupling member 4 of the driven assembly is received within the cylindrical drive coupling member 3, and coupling members 3,4 are enclosed within a fluid housing 9 formed with an injection hole Within the fluid housing 9 there is provided an electrorheological ER fluid which may be injected through injection hole 24 which occupies the gap 16 defined between the external cylindrical surface of the coupling member 3 and the inner surface of the fluid housing 9, and the gap between the inner cylindrical surface of the coupling member 3 and the outer cylindrical surface of the coupling member 4. Other man radially oriented sections formed at the ends of the coupling members 3,4, it will be appreciated that the space occupied by the ER fluid effectively forms three cylindrical spaces one defined between the inner surface of coupling member 4 and an external surface of a central shaft extending axially from coupling member 3, a second defined between the external surface of the coupling member 4 and the inner surface of coupling member 3, and the third defined between the external surface of coupling member 3 and the inner surface of the fluid housing that are coaxial with the principal axis X-X of the transmission apparatus. To prevent fluid leakage, two O-rings are used.

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The existence of a solution of optimal control problem is proved and necessary optimality conditions are established. Trapped modes of the Helmholtz equation in infinite waveguides with wall indentations and circular obstacles.

Electrorheological clutch Regularization of the semilinear sideways heat equation. Part of the Automobile series. Deutsches Urheberrecht mit Print on Demand.

Researchers have used the fluids to create a new type of clutch. Sign In Forgot password? The ER fluid is used as the coupling between the input and the output drive and driven members.

This process, called electrorheology, is reversible. The general problem on dynamics of the electrorheological clutch is formulated and studied. There was a problem providing the content you requested Approximate problem is formulated in a form of a problem with a delay. The effect of inclination on the development of slugging in channel flow.

Abstract The general problem on dynamics of the electrorheological clutch is formulated and studied. This article is also available for rental through DeepDyve. A problem on optimal control of acceleration or braking of the driven rotor is formulated and studied. The torque function is computed upon integrating the shear stresses non-linear functions of derivatives of the wlectrorheological over the surface of the driven rotor.

Scientists at the Hong Kong University of Science and Technology have developed a novel clutch based on a new class of electrorheological fluids. Sign In or Create an Account. Litvinov; Dynamics of electrorheological clutch and a problem for non-linear parabolic equation with non-local boundary conditions, IMA Journal of Applied MathematicsVolume 73, Issue 4, 1 AugustPages —, https: Oxford University Press is a department of the Electrorhrological of Oxford.

Purchase Subscription prices and ordering Short-term Access To purchase short term access, please sign in to your Oxford Academic account above. Electrorheologicap motor Hybrid vehicle drivetrain Electric generator Alternator. See also [ edit ] Electromagnetic electrorheolofical External links [ edit ] HowStuffWorks has a detailed explanation of the working of a clutch.

When an external electric field is applied, they can be changed within a few milliseconds a few thousandths of a second into a solid state but revert to liquid instantly when the current goes off.

Fluid durability in a high speed electro-rheological clutch Optimal control of electrorheological clutch described by nonlinear parabolic equation with nonlocal boundary conditions.

Close mobile search navigation Article navigation. The operation of the electrorheological clutch is simulated by a nonlinear parabolic equation which describes the motion of electrorheological fluid in the gap between the driving and driven rotors. Related articles in Web of Science Clhtch Scholar. Clutches Automotive transmission technologies. Nonlocal nonlinear boundary condition is given on a part of the boundary, which corresponds to the driven rotor.

In the case of braking, the energy production is maximized. Functions of time of the angular velocity of the driving rotor and of the voltages are considered to be controls. The existence of a solution of optimal control The operation of the electrorheological clutch is simulated by a nonlinear parabolic equation which describes the motion of electrorheological fluid in the gap between the driving and driven rotors.

The properties of ER fluids make them ideal materials to transfer energy and control motion electronically, particularly in the automotive industry. Dynamics of electrorheological clutch and a problem for non-linear parabolic equation with non-local boundary conditions W. Views Read Edit View history. By using this site, you agree to the Terms of Use and Privacy Policy. Most Related.

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US6942081B2 - Electrorheological clutch - Google Patents

The change is not a simple change in viscosity , hence these fluids are now known as ER fluids, rather than by the older term Electro Viscous fluids. The effect is better described as an electric field dependent shear yield stress. When activated an ER fluid behaves as a Bingham plastic a type of viscoelastic material , with a yield point which is determined by the electric field strength. After the yield point is reached, the fluid shears as a fluid , i. Hence the resistance to motion of the fluid can be controlled by adjusting the applied electric field.

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Electrorheological fluid

The existence of a solution of optimal control problem is proved and necessary optimality conditions are established. Trapped modes of the Helmholtz equation in infinite waveguides with wall indentations and circular obstacles. Electrorheological clutch Regularization of the semilinear sideways heat equation. Part of the Automobile series. Deutsches Urheberrecht mit Print on Demand. Researchers have used the fluids to create a new type of clutch. Sign In Forgot password?

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Electrorheological clutch

Zunos The operation of the electrorheological clutch is simulated by a nonlinear parabolic equation which describes the motion of electrorheological fluid in the gap between the driving and driven rotors. The existence of a solution of optimal control problem is proved and necessary optimality conditions are established. Most users should sign in with their email address. Optimal control of electrorheological clutch described by nonlinear parabolic equation with nonlocal boundary conditions. This process, called electrorheology, is reversible. A problem on optimal control of acceleration electrorhological braking of the driven rotor is formulated and studied.

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Images, videos and audio are available under their respective licenses. Related Research Articles ER or Er may refer to: An automatic transmission, also called auto, self-shifting transmission, n-speed automatic, or AT, is a type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually. Like other transmission systems on vehicles, it allows an internal combustion engine, best suited to run at a relatively high rotational speed, to provide a range of speed and torque outputs necessary for vehicular travel. The number of forward gear ratios is often expressed for manual transmissions as well. A torque converter is a type of fluid coupling which transfers rotating power from a prime mover, like an internal combustion engine, to a rotating driven load. In a vehicle with an automatic transmission, the torque converter connects the power source to the load. The equivalent location in a manual transmission would be the mechanical clutch.

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