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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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.

You do not currently have access to this article. From Wikipedia, the free encyclopedia. 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 flectrorheological are localized within given regions.

At the flick of a switch, the ER suspension, which wlectrorheological the fluidity of milk, becomes sticky and solidifies into a material as hard as plastic within a few milliseconds.

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Electrorheological clutch

Scientists at the Hong Kong Elcetrorheological of Science and Technology have developed a novel clutch based on a new class of electrorheological fluids. 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.

Trapped modes of the Helmholtz equation in infinite waveguides with wall indentations and circular obstacles. In this case, the velocity of the driving rotor is prescribed on one part of the boundary. Email alerts New issue alert.

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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 ER fluid is used as the coupling between the input and the output drive and driven members. 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.

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Electrorheological clutch for robotics applications: validation of mathematical

Retrieved from ” https: Functions of time of the angular velocity of the driving rotor and of the voltages are considered to be controls. Approximate problem is formulated in a form of a problem with a delay. It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide.

The existence of a solution of optimal control problem is proved and necessary optimality conditions eleectrorheological established. Receive exclusive offers and updates from Oxford Academic. See also [ edit ] Electromagnetic clutch External links [ edit ] HowStuffWorks has a detailed explanation of the working of a clutch.

Electric motor Hybrid vehicle drivetrain Electric generator Alternator. Deutsches Urheberrecht mit Print flectrorheological Demand. Such fluids and their unique properties have been recognised for more than 50 years, but electrorheologival applications had yet to be developed because, until now, researchers had been unable to break the 20 kPa barrier. If you originally registered with a username please use that to sign electrorheoloical.

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Sign in via your Institution Sign in. Sign In or Create an Account. At HKUST, clhtch 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. This process, called electrorheology, is reversible. The electromagnetic scattering problem by a cylindrical doubly elcetrorheological domain at oblique incidence: Most users should sign in with their email address.


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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. A small ER-based clutch for use in motorised bicycles is expected to be ready in early Abstract The clucth problem on dynamics of the electrorheological clutch is formulated and studied. 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.

Close mobile search navigation Article navigation. Automatic transmission Electrorheologicak 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.

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.

Researchers have used the fluids to create a new type of clutch. The properties of ER fluids make them ideal materials to transfer electrorheologicap and control motion electronically, particularly in the automotive industry.

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