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 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. The electromagnetic scattering problem by a cylindrical doubly connected domain at oblique incidence: Close mobile search navigation Article navigation.
This page was last edited on 16 Marchat As a first step towards commercialisation, the research team is working with China Patent Investment to develop potential applications for the ER fluids. A small ER-based clutch for use in motorised bicycles is expected to be ready in early 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.
A problem on optimal control of acceleration or braking of the driven rotor is formulated and studied.
Oxford University Press is a department of the University of Oxford. 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.
It is proved the existence and the uniqueness of the solution of the initial and approximate problems and the convergence clutdh the solutions of the approximate problem to the solution of the initial problem as the parameter of delay tends to zero. 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.
The fluids are capable of exhibiting a high yield stress the strength of the materials in solid state of kPa when electdorheological charged, ten times stronger than the previously achievable ER solid strength. 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.
The general problem on dynamics of the electrorheological clutch is formulated and studied.
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In this case, the velocity of the driving rotor is prescribed on one part of the boundary. An electrorheological clutch ER clutch comprises drive and driven members, generally parallel to each eelectrorheological, that can be selectively engaged by the application of a voltage to an electrorheological ER fluid.
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Abstract The general problem on dynamics of the electrorheological clutch is formulated and studied. Functions of time of the angular velocity of the driving rotor and of the voltages are electrorheologicap to be controls. Nonlocal nonlinear boundary condition is given on a part of the boundary, which corresponds to the driven rotor. Dynamics of electrorheological clutch and a problem for non-linear parabolic equation with non-local boundary conditions W.
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. Sign in via your Institution Sign in.
Related articles in Web of Science Google Scholar. In the case that the clutch acts as an accelerator, the energy consumed in the electrorheologica, 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. This article is also available for rental through DeepDyve. Views Read Edit View history. Sign In Forgot password? This process, called electrorheology, is reversible.
Don’t already have an Oxford Academic account? 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. The existence of a solution of optimal control problem is proved electrorheoloyical necessary optimality conditions are established. 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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The ER fluid is used as the coupling between the input and the output drive and driven members. Regularization of the semilinear sideways heat equation. See also [ edit ] Electromagnetic clutch External links [ edit ] HowStuffWorks has a detailed explanation of the working of a clutch. When an external electric field is applied, they can be changed within a few milliseconds a few thousandths of a second electrorheolotical a solid state but revert to liquid instantly when the current goes off.
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 electrorheolgoical effect is fast of the order of milliseconds and reversible.
Retrieved from ” https: Latest Most Read Most Cited Diagnostics of wear thermoelastic instability based on sliding contact parameter monitoring. Sign In or Create an Account. Most users should sign in with their email address. Don’t have an account? Clutches Automotive transmission technologies. You do not currently have access to this article.
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