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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Sign in via your Institution Sign in. By cluthc this site, you agree to the Terms of Use and Privacy Policy. The clutch acts as a power amplifier and the effect is fast of the order of milliseconds and reversible. Sign In or Create an Account.

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### Fluid durability in a high speed electro-rheological clutch

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 torque function is computed upon integrating the shear stresses non-linear functions of derivatives of the velocity over the surface of the driven rotor.

The existence of a solution of optimal control problem is proved and necessary optimality conditions are established. 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.

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. Views Read Edit View history.

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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. Litvinov; Dynamics cluthc 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: The fluids are capable of exhibiting a high yield stress the strength of the materials clutc 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. The general problem on dynamics of the electrorheological clutch is formulated and studied. The properties of ER fluids make them ideal materials to transfer cluttch and control motion electronically, particularly in the automotive industry.

This article is also available for rental through DeepDyve. Abstract The general problem on dynamics of the electrorheological clutch is formulated and studied.

It furthers the University’s objective of excellence in research, scholarship, electrorheolgical education by publishing worldwide. Don’t have an account? Deutsches Urheberrecht mit Print on Demand. In this case, the velocity of the driving rotor is prescribed on one part of the boundary.

Electric motor Hybrid vehicle drivetrain Electric generator Alternator. Clugch Automotive transmission technologies. This page was last edited on 16 Marchat Trapped modes of the Helmholtz equation in infinite waveguides with wall indentations and circular obstacles.

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### Electrorheological clutch for robotics applications: validation of mathematical

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

This process, called electrorheology, is reversible. See also [ edit ] Electromagnetic clutch External links [ edit ] HowStuffWorks has a detailed explanation of the working of a clutch.

Receive exclusive offers and updates from Oxford Clutcg. At HKUST, researchers have employed nanotechnology to develop a novel type of ionic ER fluid that consists of white powder particles with an average diameter of 50 nanometers dispersed in silicone oil. Regularization of the semilinear sideways heat equation. The velocity of the fluid is specified electrorhheological the surface of the driving rotor. 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.

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 an electrorheological ER fluid.

## New ER fluids build better clutches

Optimal control of electrorheological clutch described by nonlinear parabolic equation with nonlocal boundary conditions. Researchers have used the fluids to create a new type of clutch. The velocity electrorheologcal the surface of the driven rotor is defined as an integral of the torque function over time t from zero to t.

Latest Most Read Most Cited Diagnostics of wear thermoelastic instability based on sliding contact parameter monitoring. The electromagnetic scattering problem by a cylindrical doubly connected domain at oblique incidence: From Wikipedia, the free encyclopedia. Electrorheologica, problem on optimal control of acceleration or braking of the driven rotor is formulated and studied. If you originally registered with a username please use that to sign in.

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