Magnetorheological Fluid Applications
Potential applications of MR fluids are summarized in those devices that need quick, continuous, and reversible transformation in rheological characteristics [1 ].
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Magnetorheological Fluid Applications
Potential applications of MR fluids are summarized in those devices that need quick, continuous and reversible transformation in rheological characteristics [1]. Generally speaking, MR fluid devices use one of the three basic modes of operation of MR fluids, i.e., valve, shear and squeeze modes, or any combination of them depending on the function of the system [1–3]. This is evidence that the rheological, magnetic behaviors, circuit, and the working mode of MR fluids should be considered before designing any MR fluid device. Rabinow [4] stated initial ideas of potential applications of MR fluids, such as energy-absorbing devices, dashpots or shock absorbers, three-dimensional graphs, and mould making. Recent development in MR fluid technology shows that some new generations of their applications are found to be in dampers, shock absorbers, clutches, and brakes devices [5]. This may be because magnetorheological fluid puts mechanical devices in direct contact with an electronic system, which enables continuous recognition of mechanical features of the apparatus. Guerrero-Sanchez et al. [6] found some modern applications of MR fluids in drug delivery and cancer treatment plans in medical science. Olabi and Grunwald [2], in their study of MR fluids, found a direct relationship between the characteristics of MR fluids and applications for treatment. Their results revealed the promising characteristics of MR fluids such as quick and continuous response, simple interface between electrical power input and mechanical power output, and their controllability, which makes them a good candidate for future technology choices utilized in several applications. Below, the principles, characteristics, and engineering applications of MR fluid devices are briefly described.
© Springer Nature Singapore Pte Ltd 2016 A. Hajalilou et al., Field Responsive Fluids as Smart Materials, Engineering Materials, DOI 10.1007/978-981-10-2495-5_5
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5 Magnetorheological Fluid Applications
Damper
This section briefly focuses on the damper applications in different MR fluids in the flow mode (valve mode), shear mode, and squeeze mode. Damper is defined as a device to reduce shock, to restrict movement, to neutralize the kinetic force and so on. In the magnetorheological point of view, damper is a device which contains magnetorheological fluids and is controlled by the power of magnetic field.
5.1.1
Dampers in the Flow Mode
Damper in the flow mode typically uses the structure of a cylinder with a piston. The flow control (valve) for MR fluid is the orifice in the piston or individual bypass in the cylinder once the magnetic field is applied. They are divided into a single-ended piston-rod type and a double-ended piston-rod type in terms of structure. The rheonetic linear MR fluid damper was created by Lord Corporation (Cary, North Carolina), using the single-ended piston-rod structure, as shown in Fig. 5.1; this has been applied to the semi-active vibration control system for heavy-duty vehicle se
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