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

Sign In Forgot password? The velocity of the fluid is specified on the surface of the driving rotor. As a first step towards commercialisation, the research team electrorheologiccal working with China Patent Investment to develop potential applications for the ER fluids.

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From Wikipedia, the free encyclopedia. It is proved the existence and the uniqueness of the solution of the initial and approximate problems and electrorheologicak convergence of the solutions of the approximate problem to the solution of the initial problem as the parameter of delay tends to zero.

Deutsches Urheberrecht mit Print on Demand. 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 to elecfrorheological electrorheological ER fluid.


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Electrorheological clutch – Wikipedia

The properties of ER fluids make them ideal materials to transfer energy and control motion electronically, particularly in the automotive industry. Scientists at the Hong Kong University of Science and Technology have developed a novel clutch based on a new class of electrorheological fluids.

Functions of time of the angular velocity of the driving rotor and of the voltages are considered to be controls. The ER fluid is used as the coupling between the input and the output drive and driven members. The existence of electroryeological solution of optimal control problem is proved and necessary optimality conditions are established.

New ER fluids build better clutches

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 or Create an Account.

If you originally registered with a username please use that to sign in. 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 electrorbeological unit Universal joint.

Fluid durability in a high speed electro-rheological clutch

Regularization of the semilinear sideways heat equation. Approximate problem is formulated in a form of a problem with a delay. The clutch acts as a power amplifier and the effect is fast of the order of milliseconds and reversible.


You do not currently have access to this article. 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.

Most users should sign in with their email address. A problem on optimal control of acceleration or braking of the driven rotor is formulated and studied. In the case of braking, the energy production is maximized. Trapped modes of the Helmholtz equation in infinite waveguides with wall indentations and circular obstacles. Abstract The general problem on dynamics of the electrorheological clutch is formulated and studied. Purchase Subscription prices and ordering Short-term Access To purchase short term access, please sign in to your Oxford Academic account above.

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Electrorheological clutch

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. Don’t have an account?

When an external electric field is electrorheologicxl, 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. Don’t already have an Oxford Academic account? Email alerts New issue alert.