Magnetorheological semi-active mount system for engines: Prototyping and testing

Liu, Qing; Bai, Guo-Dong; Liu, Zhihao; Bai, Xian–Xu; Du, Hao; Chen, Peng; Qian, Li-Jun

doi:10.1177/0954407020925724

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…However, the controllability of the MR squeeze mount is limited by the squeeze gap. To maximize controllability, Liu et al [61] devised a novel mechanism for a MR mount with an internal bypass. Because the MR fluid channel consists of inner and outer concentric cylinders and the piston divides the inner cylinder, the proposed MR mount has many benefits such as a large controllable range and working stroke and small field-off dynamic stiffness.…”

Section: Mr Mount Applicationsmentioning

confidence: 99%

Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

Sohn

Choi

2022

Actuators

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This review article presents various multi-DOF application systems that utilize smart magnetorheological (MR) fluid. It is well known that MR fluid has been actively studied and applied in many practical systems such as vehicle suspension dampers. The design requirements for the effective applications of MR fluid include geometry optimization, working principles, and control schemes. The geometry optimization is mostly related to the size minimization with high damping force, while the working principles are classified into the shear mode, the flow mode, and the squeeze mode depending on the dominant dynamic motion of the application system. The control schemes are crucial to achieve final targets such as robust vibration control against disturbances. It should be addressed that advanced output performances of MR application systems heavily depends on these three requirements. This review article presents numerous application systems such as sandwich structures, dampers, mounts, brakes, and clutches, which have been developed considering the three design requirements. In addition, in this article some merits and demerits of each application system are discussed to enable potential researchers to develop more effective and practical MR application systems featuring the multi-DOF dynamic motions.

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Section: Mr Mount Applicationsmentioning

confidence: 99%

Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

Sohn

Choi

2022

Actuators

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“…While significant progress has been made in the study of dynamic characteristics and structures of MRF mounts, research on wide-frequency vibration isolation of such mounts remains relatively limited. Liu et al (2020) proposed an MRF mount, known as the internal bypass valve-type MRF mount, which exhibits a large dynamic stiffness range, small zero-field dynamic stiffness, and maximized working stroke across the entire operating frequency range. Chen et al (2019) investigated the phenomenological mechanical model of MRF engine mount under engine frequency variations and magnetic effects.…”

Section: Introductionmentioning

confidence: 99%

New bell plate controlled multi-inertia channel magnetorheological fluid mount wide frequency vibration isolation control study

Lin,

Chen,

et al. 2024

Journal of Intelligent Material Systems and Structures

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This paper introduces a novel type of magnetorheological fluid (MRF) mount designed to achieve wide-frequency vibration isolation for engines. While previous studies have explored vibration isolation using hydraulic mounts, there has been limited research on achieving wideband isolation with MRF mounts. Consequently, this paper presents an innovative MRF mount structure and investigates wideband vibration isolation control for engines. Initially, experiments with a multi-channel MRF damper validate the switchable operation of controllable channels. A novel controllable multi-inertia channel MRF mount system is proposed, aligning the working mode of controllable inertia channels with that of the MRF damper. The lumped parameter method is employed to derive the mathematical model of the MRF mount, and its high and low-frequency dynamic characteristics are thoroughly examined. Subsequently, a real-time multi-island genetic algorithm-optimized controller is developed to investigate wideband vibration isolation within the MRF mount system. The findings indicate that: (1) The MRF mount demonstrates adjustable low-frequency dynamic stiffness and loss angle within the frequency range of f = 0–50 Hz. In the frequency range of f = 50–100 Hz, the mount achieves its lowest dynamic stiffness value, effectively addressing the issue of high-frequency stiffening. (2) The real-time multi-island genetic optimized controller exhibits superior vibration isolation performance compared to traditional sky-hook control and hybrid sky-hook control methods, achieving optimal vibration isolation for the mount.

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“…In this configuration the height of the flow channel is varied according to the prescribed displacement or force. Exemplary devices include small stroke dampers [18] or engine mounts [19] in which a rather large force can be achieved across a fairly small displacement span. The (d) pinch mode principle is different.…”

Section: Introductionmentioning

confidence: 99%

Magnetorheological fluids subjected to non-uniform magnetic fields: experimental characterization

Kubík¹,

Gołdasz²,

Macháček³

et al. 2023

Smart Mater. Struct.

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Magnetorheological (MR) fluids are suspensions of fine, low-coercivity, high-magnetizable particles in a continuous liquid phase. When subjected to magnetic field, the material exhibits a rapid change in the apparent viscosity of several orders of magnitude. This unique capability has been successfully exploited in automotive semi-active suspensions systems or systems for manufacturing high quality optics. In a majority of the existing systems the rheology of MR fluids is controlled by an external uniform field oriented perpendicularly to the fluid flow direction. In general, it is an inherent feature of MR systems operating in flow, shear or squeeze modes, respectively. There is an experimental evidence that the behavior of MR fluids in the so-called pinch-mode (in which the fluid is subjected to non-uniform magnetic field distributions ) clearly stands out against the remaining three operating modes. With the predecessors, the flow through the channel occurs once a pressure across it exceeds the field-dependent threshold pressure. For comparison, in pinch mode valves the magnetic flux energizes mostly the layers of the materials near the channel walls. The outcome is a change in the channel’s effective diameter achieved solely via material means without changing its geometry. To study the fluid’s unique behaviour in the mode the authors designed a prototype valve assembly and examined several fluid formulations of various particle concentration levels across a wide range of external (velocity, magnetic field density) stimuli in an organized effort to further comprehend the phenomenon. The obtained data indicate that the magnitude of the particular effect does not only depend on the magnitudes of the magnetic stimuli but also on the particle concentration. In general, the authors believe that the study may provide guidelines as to the selection of fluid formulations for developing novel valveless actuators utilizing MR fluids operating in pinch mode.

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Magnetorheological semi-active mount system for engines: Prototyping and testing

Cited by 7 publications

References 25 publications

Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

New bell plate controlled multi-inertia channel magnetorheological fluid mount wide frequency vibration isolation control study

Magnetorheological fluids subjected to non-uniform magnetic fields: experimental characterization

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