reduces, or even obviates, the need for the solid particle suspension. Introduction . Electrorheological fluids as a means of operating clutch mechanisms were. Smart Technology produces and sells Smart Materials like Electro Rheological Fluid and Piezo Actuators worldwide. The paper presents experimental results concerning the wear of heterogeneous electro-rheological (ER) fluids operating as working fluids in a complex clutch.

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This process, called electrorheology, is reversible. In the case of braking, the energy production is maximized.

From Wikipedia, the free encyclopedia. The electromagnetic scattering problem by a cylindrical doubly connected domain at oblique incidence: Clutches Automotive transmission technologies.

The existence of a solution of optimal control problem electrorheologicak proved and necessary optimality conditions are established. Citing articles via Web of Science 3.

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. Email alerts New issue alert. To purchase short term access, please sign in to your Oxford Academic account above.

The velocity on the surface of the driven rotor is defined as an integral of the torque function over time t from zero to t. If you originally registered with a electrorheolkgical please use that to sign in. Researchers have used the fluids to create a new type of clutch. The fluids are capable of exhibiting a high yield stress the strength of the materials in solid electrorheklogical of kPa when electrically charged, ten times stronger than the previously achievable ER solid strength.

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Dynamics of electrorheological clutch and a problem for non-linear parabolic equation with non-local boundary conditions W. The properties of ER fluids make them ideal materials to transfer energy and control motion electronically, particularly in the automotive industry. 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.


Sign In Forgot password? The torque function is computed upon integrating the shear stresses non-linear functions of derivatives of the velocity over the surface of the driven rotor. Regularization of the semilinear sideways heat equation. The electroryeological amounts to finding out a function of velocity of the electrorheological fluid which satisfies the motion electrorheologicao non-linear parabolic equation and mixed non-classical boundary conditions.

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Abstract Cluch general problem on dynamics of the electrorheological clutch is formulated and studied.

New ER fluids build better clutches | The Engineer The Engineer

The ER fluid is used as the coupling between the input and the output drive and driven members. Such fluids and their unique properties have been recognised for more than 50 years, but practical applications had yet to be developed because, until now, researchers had been unable to break clytch 20 kPa barrier.

By using this site, you agree to the Terms of Use and Privacy Policy. At the flick of a switch, electrorgeological ER suspension, which has the fluidity of milk, becomes sticky and solidifies into a material as hard as plastic within a few milliseconds. An electrorheological clutch ER clutch comprises drive and driven members, generally parallel to each other, that can be selectively engaged by the application of a voltage cclutch an electrorheological ER fluid.


Trapped modes of the Helmholtz equation in infinite waveguides with wall indentations and circular obstacles.

Close mobile search navigation Article navigation. You do not currently have access to this article. Sign In or Create an Account. See also [ edit ] Electromagnetic clutch External links [ edit ] HowStuffWorks has a detailed explanation of the working of a clutch. It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide.

Automatic transmission Chain drive Clutch Constant-velocity joint Continuously variable transmission Coupling Differential Direct-shift gearbox Drive shaft Dual-clutch transmission Drive wheel Electrohydraulic manual transmission Electrorheological clutch Epicyclic gearing Fluid coupling Friction drive Gear stick Giubo Hotchkiss drive Limited-slip differential Locking differential Manual transmission Manumatic Parking pawl Park by wire Preselector gearbox Semi-automatic transmission Shift by wire Torque converter Transaxle Transmission control unit Universal joint.

Optimal control of electrorheological clutch described by nonlinear parabolic equation with nonlocal boundary conditions. Don’t already have an Oxford Academic account? As a first step towards commercialisation, the research team is working with China Patent Investment to develop potential applications for the ER fluids. 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 Google Scholar. In this case, the velocity of the driving rotor is prescribed on one part of the boundary.