Various active damping systems have promised an answer here, and none has been more impressive than delphis magneride, the magnetorheological damper system used by audi. In this paper an innovative multigap magnetorheological clutch is described. Design of a magnetorheological brake system based on. Clutch magnetic circuit is analyzed by ansys software, which proves the feasibility of this design. Magneto rheological fluid high torque transfer device for. Adjusting the output impedance in realtime allows a device to better adapt to a variety of tasks, operate in. The seal housing has a groove carrying a seal that seals the cavity. The running efficiency of centrifugal fan affects the economical efficiency of the ventilation system.
Barkan kavlicoglu, faramarz gordaninejad, yanming liu, xiaojie wang, and nigar cobanoglu figure 2 presents a cutview of the fea. Functional requirements are derived and a mechanical system is presented. The design of magnetorheological fluid in the autopress. The torque exerted by mr fluid on the rotary disks is a function of magnetic field created by electric. When the magnet is in place the mr fluidturns into solid. Magneto rheological fluid mr fluid or mrf can be defined as smart and controllable fluids. In this paper the dependence of the torque characteristic of a magnetorheological clutch on several working parameters is analysed by means of a feedforward neural network. Modeling of the mractuators consist of two parts relating the output torque of the actuator to its internal magnetic field, and the internal.
Proceedings of the 9th international offshore and polar engineering conference june, vol. Stamant2 1lsmi, mechanical engineering department, universite laval, quebec, quebec, canada, g1k 7p4 phone. Magnetorheological is listed in the worlds largest and most authoritative dictionary database of abbreviations and acronyms. Magnetorheological fluid applications springerlink. Overview mr fluids are a suspension of micrometersize magnetizable particles in a. It is demonstrated that the offstate no applied magnetic. Finite element analysis of magnetorheological brake using. Whether youve loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Index terms magnetorheological fluid, automotive differential, vehicle. A magneto rheological fluid clutch according to a preferred. Analysis of the experimental torque characteristic of a. The mr brake consists of multiple rotating disks immersed into an mr. Finite element analysis of magnetorheological brake using ansys. In contrast, the torque capacity of the clutch with mr.
The aim of said invention is to minimise the assembly space. Role of magnetorheological fluids and elastomers in today. Magnetorheological dampers and magnetorheological shock absorbers are applied e. Szabo2 1university of novi sad, 6 trg dositeja obradovica, 21 000 novi sad, serbia email. A lumpedparameter mathematical model of an automotive magnetorheological mr fluid fan clutch was developed. Us7870939b2 us11884,693 us88469305a us7870939b2 us 7870939 b2 us7870939 b2 us 7870939b2 us 88469305 a us88469305 a us 88469305a us 7870939 b2 us7870939 b2 us 7870939b2 authority us united states prior art keywords yoke discs magnetorheological magnetic secondary prior art date 20050221 legal status the legal status is an assumption. The final choice consisted in an mr clutch with permanent magnet, which satisfied size, torque and failsafe specifications. Each mode has its own characteristics for the high performance of. Analysis of a magnetorheological transmission for fan clutch. Proceedings of the asme 2012 11th biennial conference on engineering systems design and analysis. In this paper, we proposed a continuously variable transmission system based on magnetorheological fluid and shape memory alloy for improving the operating efficiency of the centrifugal fan. The design of magnetorheological fluid in the autopress clutch. Barkan kavlicoglu, faramarz gordaninejad, yanming liu, xiaojie wang, and nigar cobanoglu figure 2 presents a. Electromagnetic finite element analysis fea is performed to design and optimize the clutch.
As tires become ever lower in profile and roads get ever worse, ride comfort is knife with two blades if a car is to have the sharp responses we like. Magneto rheological fluid is one of the smart materials which are gaining importance in current scenario. Rabinow proposed to use fine micronsized iron particles. A cabledriven robotic arm powered by magnetorheological. Us7870939b2 us11884,693 us88469305a us7870939b2 us 7870939 b2 us7870939 b2 us 7870939b2 us 88469305 a us88469305 a us 88469305a us 7870939 b2 us7870939 b2 us 7870939b2 authority us united states prior art keywords yoke discs magnetorheological magnetic secondary prior art date 20050221 legal status the legal status is an assumption and is not a legal conclusion. Response of a magnetorheological brake under inertial loads. Mr continuously variable transmission driven by sma for. Role of magnetorheological fluids and elastomers in todays. Introduction the magnetorheological fluid mrf and related clutch devices were invented at the national bureau of standards by jacob rabinow in 1940s 1. Sep 22, 2017 innovator project training institution ipc project center 1447d, avinashi road, back side of p. This study focuses on the design and characterization of a radial doubleplate magnetorheological fluid mrf clutch.
In this paper, the torque transmitted by mr fluids is analyzed to compute the torque transmission ability in the disktype mr fan clutch. The clutch was envisaged to have the possibility to disengage the vacuum pump in diesel engine vehicles, in order to increase the overall vehicle efficiency. The aim of said invention is to minimise the assembly space and the. When subjected to a magnetic field, the fluid greatly increases its apparent viscosity, to the point of becoming a viscoelastic solid. Magnetorheological fluid before and after exposure to a magnetic field without current flowing through the wires, the armor would remain soft and flexible. A magneto rheological fluid clutch according to a preferred aspect of the present invention includes a seal housing carried on the input shaft inside the input clutch plate so that the input clutch plate is fixed on the input shaft through the seal housing.
Design and testing of an experimental magnetorheological. Importantly, the yield stress of the fluid when in its active on state can be controlled very accurately by varying the magnetic field intensity. Magneto rheological fluid mrfclutch and its design aspects a magneto rheological fluid clutch consists of a input shaft that rotates and which carries an input clutch plate and a housing with front and rear covers. The inventive magnetorheological clutch comprises a fixed part 1, a primary rotatable part provided with primary discs 4 and a secondary part 6 provided with secondary discs 14, wherein a magnetorheological fluidcontaining space 19 is formed and a magnetic field acts on said magnetorheological fluid. Design and manufacturing aspects of magnetorheological. Lumped parameter modeling of a magnetorheological fluid. It is shown how magna powertrain could create an efficient mrf clutch by.
Design and testing of a novel multipledisc magneto. Other readers will always be interested in your opinion of the books youve read. Magnetorheological fluid mechanical engineering applied. Abstractmodeling of a magnetorheological mr fluids based actuators is considered in this project.
The clutch s torque output can be controlled by adjusting the applied magnetic field. This property can be utilised for torque transmission in clutches. In electromagnetic clutches a mr fluid is located between discs of driving and driven members fig. But at the flip of the switch, electrons would begin to move through the circuits, creating a magnetic field in the process. Magnetorheological torque transmission devices with. Magnetorheological fluids mrf change their viscocity in magnetic fields.
The leg uses magnetorheological mr fluid between sliding steel plates to generate motion. In order to evaluate the effectiveness of the proposed device, a physical prototype was realized and the first experimental tests were carried out. Pdf modeling of a magnetorheological clutch peyman. A magnetorheological clutch for efficient automotive. Mr brake system consists of rotary disks immersed in a mr fluid and enclosed in an electromagnet. The clutchs torque output can be controlled by adjusting the applied magnetic field. To find out more, see our privacy and cookies policy. The aim of this paper is to understand the electromagnetic action in a magnetorheological mr brake mrb system using finite element method. Frendo2 1department of energy and systems engineering, university of pisa, largo. The equation of transmission torque developed by magnetorheological fluid is. This article presents a novel vehicle clutch utilizing magnetorheological fluid and multipledisc structure. Pdf design of a magnetorheological clutch mechanism. Its sensors detects road roughness every millisecond, and. Innovator project training institution ipc project center 1447d, avinashi road, back side of p.
Experimental characterization of a permanent magnet magnetorheological clutch for automotive applications. Magnetorheological what does magnetorheological stand. A magnetorheological fluid mr fluid, or mrf is a type of smart fluid in a carrier fluid, usually a type of oil. Yalcintas, m magnetorheological fluid based torque transmission clutches. The aim of this work is to present basics of design and the results of experimental investigation performed on cylindrical mr clutch. Variable impedance actuation is characterized by the ability to independently set output force and output impedance for a robotic device. Magnetorheological what does magnetorheological stand for. Hence, the operational states of this clutch are reversed with respect to the common mr clutches equipped with an electromagnet only. The mrf clutch thus may replace the existing torque converters and therefore help increase the fuel economy.
A multigap magnetorheological clutch with permanent magnet. A multigap magnetorheological clutch with permanent. Mrf devices are usually designed based on three operating modes of mrf. Aerospace magnetorheological dampers are under development for use in military and commercial helicopter cockpit seats, as safety devices in the event of a crash. This model is able to describe the average fluid temperature, average clutch temperature, and output fan speed as a function of time, input current, and fluid composition. Design and testing of an experimental magnetorheological fluid clutch zvonko.
The wisconsin alumni research foundation warf is seeking commercial partners interested in developing a magneto rheological mr fluid device capable of providing high torque transfer for clutch applications. Simulation and experiment on transient temperature field. Functions of mr fluids these are liquids that change their propertieswhen we apply a magnetic field to them. This model is able to describe the average fluid temperature, average clutch temperature, and output fan speed as a function of.
Magnetorheological fluid and its applications pranav gadekar, v. Jun 02, 2017 physics describing a substance whose rheological properties are modified by a magnetic field. Khaire mechanical department, mitcoe, pune university, pune, maharashtra, india accepted 12 march 2017, available online 16 march 2017, special issue7 march 2017 abstract. Sep 17, 2017 the magnetorheological brake mrb is an electronic braking system for the automotive or aerospace engineering.
Bucchi, francesco, forte, paola, and frendo, francesco. Magnetorheological fluid basic working model and calculation model is firstly introduced. Simulation and experiment on transient temperature. Torque capacity enhancement of a magnetorheological fluid. Performance evaluation and validation of magneto rheological. Then the autopress clutch dynamics theory is analyzed.
Importantly, the yield stress of the fluid when in its active on state can be controlled. A magnetorheological clutch mrc uses this property to transmit torque between two coaxial radial plates, the torque transmitted varying as a function of the magnetic field applied. When current is applied to the electromagnet coil, the mr. The front and rear covers support the output element on the input shaft through an axially spaced bearing arrangement for durability.
Although magnetorheological fluids have a good quality of control, due to their restricted efficiency they have not been suitable for applications in vehicle powertrains so far. When the magnet is removed the solidinstantly reverts to liquid 3. Experimental characterization of a permanent magnet. Magnetorheological fluid synonyms, magnetorheological fluid pronunciation, magnetorheological fluid translation, english dictionary definition of magnetorheological fluid. The magnetorheological brake mrb is an electronic braking system for the automotive or aerospace engineering. Magnetorheological fluid, magnetorheological clutch, mechanical design, magnetic design, permanent magnet, modeling. The microsize gap works for the reduction of magnetic.
Magnetorheological fluid definition of magnetorheological. Design and manufacturing aspects of magnetorheological fluid. A multigap magnetorheological clutch with permanent magnet r rizzo1,3, a musolino1, f bucchi2, p forte2 and f frendo2 1department of energy and systems engineering, university of pisa, largo lucio lazzarino, 56122, pisa, italy 2department of civil and industrial engineering, university of pisa, largo lucio lazzarino, 56122, pisa, italy email. Proceedings of spie history of magnetorheological finishing. In order to be used in vehicle, the clutch utilizes a new multipledisc transmission form to increase the output torque and disperses the heat due to the friction on the whole working faces.
A magnetorheological mr fan clutch is a device that transmits torque by the shear stress of the mr fluids. It is a noncolloidal mixture of ferromagnetic particles randomly dispersed in oil or water, along with surfactants used. The results show that with the increase of the applied magnetic field, the torque developed by mr fluids goes up rapidly. The optimal geometry of the clutch for maximum transmissible torque, in terms of number and dimensions of the coil sectors, was determined for each shape and coil con guration and the results were validated by nite element models. A magnetorheological clutch mrc uses this property to transmit torque between two coaxial radial plates, the torque transmitted varying as a. Mrf clutch magnetorheological clutch magneto hydrodynamic. The most modern design of the mrb has been developed in collaboration with.
A multigap magnetorheological clutch with permanent magnet r. Geometry optimization of a magnetorheological clutch operated. A magnetorheological damper or magnetorheological shock absorber is a damper filled with magnetorheological fluid, which is controlled by a magnetic field, usually using an electromagnet. G rural medical center, near muniappan temple, neelambur bus stop, coimbatore 641 062. The bearings are provided which support the housing on the input shaft. A physical prototype of an automotive magnetorheological. Geometry optimization of a magnetorheological clutch. Various devices working with mr fluids include clutches, brakes, hydraulic valves, dampers, robotic arms. The viscosity of magnetorheological fluid is electronically controlled by a magnetic field. Mazlan2 1mechanical engineering department, faculty of engineering, universitas sebelas maret jl. This allows the damping characteristics of the shock absorber to be continuously controlled by varying the power of the electromagnet. Response of a magnetorheological brake under inertial loads ubaidillah 1, fitrian imaduddin2, muhammad nizam, and saiful a.