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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Approximate problem is formulated in a form of a problem with a delay. 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.

Close mobile search navigation Article navigation. Related articles in Web of Science Google Scholar. The properties of ER fluids make them ideal materials to transfer energy and electrorheologifal motion electronically, particularly in the automotive industry.

From Wikipedia, the free encyclopedia. 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. 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.

Researchers have used the fluids to create a new type of clutch. Optimal control of electrorheological clutch described by nonlinear parabolic equation with nonlocal boundary conditions. At HKUST, researchers have employed nanotechnology to develop a novel type of ionic ER fluid that consists of white electrorhelogical particles with an average diameter of 50 nanometers dispersed in silicone oil.

You do not currently have access to this article. At the flick of a switch, the ER suspension, which has the fluidity of milk, becomes sticky and solidifies into a material as hard as plastic within a few milliseconds. Deutsches Urheberrecht mit Print on Demand. Receive exclusive offers and updates from Oxford Academic.

The velocity of the fluid is specified on the surface of the driving rotor. Email alerts New issue alert. A small ER-based clutch for use in motorised bicycles is expected to be ready in early This page was last edited on 16 Marchat The ER fluid is used as the coupling between the input and the output drive and driven members.

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Electrorheological clutch

Sign eoectrorheological via your Clutcj Sign in. The general problem on dynamics of the electrorheological clutch is formulated and studied. Sign In Forgot password? 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 AugustCltuch —, https: 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.

This article is also available for rental through DeepDyve. 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 the 20 kPa barrier. Clutches Automotive transmission technologies.

Smart Technology Limited – Electro-Rheological (ER) fluid

If you originally registered with a username please use that to sign in. It is proved the existence and the uniqueness of the solution of the initial and approximate problems and the convergence of the solutions of the approximate problem to the solution of the initial problem as the parameter of delay tends to zero. The fluids are capable of exhibiting a high yield stress the strength of the materials in solid state of kPa when electrically charged, ten times stronger than the previously achievable ER solid strength.

As a first step towards commercialisation, the research team is working with China Patent Investment to develop potential applications for the ER fluids. An electrorheological electrorheologicak ER clutch comprises drive and driven members, generally parallel to each other, that can be selectively engaged by the application of a voltage to an electrorheological ER fluid. A problem on optimal control of acceleration or braking of the driven rotor is formulated and studied.

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

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The effect of inclination on the development of slugging in channel flow. The problem amounts to finding out a function of velocity of the electrorheological fluid which satisfies the motion equation non-linear parabolic equation and mixed non-classical boundary conditions.

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To purchase short term access, please sign in to your Oxford Academic account above. Nonlocal nonlinear boundary condition is given on a part of the boundary, which corresponds to the driven rotor. The electromagnetic scattering problem by a cylindrical doubly connected domain at oblique incidence: Views Read Edit View history. Functions of time of the angular velocity of the driving rotor and of the voltages are considered to be controls.

Electric motor Hybrid vehicle drivetrain Electric generator Alternator. This process, called electrorheology, is reversible. Oxford University Press is a department of the University of Oxford.

Regularization of the semilinear sideways heat equation. The existence of a solution of optimal control problem is proved and necessary optimality conditions are established. Sign In or Create an Account. Don’t have an account? You could not be signed in. Purchase Subscription prices and ordering Short-term Access To purchase short term access, please sign in to your Oxford Academic account above.

Part of the Automobile series. 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 velocity on the surface of the driven rotor is defined as an integral of the torque function over time t from zero to t. In the case that the clutch acts as an accelerator, the energy consumed in the acceleration of the driven rotor is minimized under the restriction that at some instant, the angular velocity and the acceleration of the driven rotor are localized within given regions.

Dynamics of electrorheological clutch and a problem for non-linear parabolic equation with non-local boundary conditions W.