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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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.

Electrorheological clutch – Wikipedia

Electric motor Hybrid vehicle drivetrain Electric generator Alternator. 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.

This process, called electrorheology, is reversible. 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 e,ectrorheological an electrorheological ER fluid.

Clutches Automotive transmission technologies. Approximate problem is formulated in a form of a problem with a delay.

Electrorheological clutch for robotics applications: validation of mathematical

Such fluids and their unique properties have been recognised for more electrorheologcal 50 years, but practical applications had yet to be developed because, until now, researchers had been unable to break the 20 kPa barrier. The velocity of the fluid is specified on the surface of the driving rotor. 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.

Scientists at the Hong Kong University of Science and Technology have developed a novel clutch based on a new class of electrorheological fluids. Deutsches Urheberrecht mit Print on Demand. 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. 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 Electrorheologicao 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.


If you originally registered with a username please use that to sign in. 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.

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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. See also [ edit ] Electromagnetic clutch External links [ edit ] HowStuffWorks has a detailed explanation of the working of a clutch. Don’t already have an Oxford Academic account? This article is also available for rental through DeepDyve. A problem on optimal control of acceleration or braking of the driven rotor is formulated and studied.

Email alerts New issue alert. 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.

A small ER-based clutch for use in motorised bicycles is expected to be ready in early Nonlocal nonlinear boundary condition is given on a part of the boundary, which corresponds to the driven rotor.

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The effect of inclination on the development of slugging in channel flow. Retrieved from ” https: 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: The clutch acts as a power amplifier and the effect is fast of the order of milliseconds and reversible.


Latest Most Read Most Cited Diagnostics of wear thermoelastic instability based on sliding contact parameter monitoring. 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. Citing articles via Web of Science 3.

Part of the Automobile series. The problem amounts to finding out a function of velocity of the electrorheological clutcy which satisfies the motion equation non-linear parabolic equation and mixed non-classical boundary conditions. Optimal control of electrorheological clutch described by nonlinear parabolic equation with nonlocal boundary conditions. In this case, the velocity of the driving rotor is prescribed on one part of the boundary. Researchers have used the fluids to create a new type of clutch.

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

Regularization of the semilinear sideways heat equation. Sign In or Create an Account.

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 general problem on dynamics of the electrorheological clutch is formulated and studied. By using this site, you agree to the Dlutch of Use and Privacy Policy. You do not currently have access to this article. dlectrorheological