Topic
Magnetorheological fluid
About: Magnetorheological fluid is a research topic. Over the lifetime, 8538 publications have been published within this topic receiving 131502 citations. The topic is also known as: MRF & MR fluid.
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TL;DR: In this article, a shear mode magnetorheological fluid damper is attached to a 12.65 m inclined flat-sag steel cable to reduce cable vibration in cable-stayed bridges.
Abstract: Stay cables, such as are used in cable-stayed bridges, are prone to vibration due to their low inherent damping characteristics. Transversely attached passive viscous dampers have been implemented in many bridges to dampen such vibration. However, only minimal damping can be added if the attachment point is close to the bridge deck. For longer bridge cables, the relative attachment point becomes increasingly smaller, and passive damping may become insufficient. A recent analytical study by the authors demonstrated that “smart” semiactive damping can provide increased supplemental damping. This paper experimentally verifies a smart damping control strategy employing H2 ∕linear quadratic Gaussian (LQG) clipped optimal control using only force and displacement measurements at the damper for an inclined flat-sag cable. A shear mode magnetorheological fluid damper is attached to a 12.65 m inclined flat-sag steel cable to reduce cable vibration. Cable response is seen to be substantially reduced by the smart da...
74 citations
22 Jun 2000
TL;DR: In this article, a semi-active seat suspension with a magneto-rheological (MR) fluid damper, which is applicable to commercial vehicles such as a large size of truck, is presented.
Abstract: This paper presents a semi-active seat suspension with a magneto-rheological (MR) fluid damper, which is applicable to commercial vehicles such as a large size of truck. A cylindrical MR seat damper is designed and manufactured by incorporating Bingham model of MR fluid. After evaluating field-dependent damping characteristics, the controllability of the damping force is experimentally demonstrated in time domain by implementing PID controller. A semi-active seat suspension system is then constructed and its governing equation of motion is derived. A skyhook control scheme is formulated in order to reduce vibration level at the driver's seat. The controlled responses such as acceleration transmissibility are evaluated in frequency domain. In addition, performance characteristics of a full-car model installed with the proposed MR seat suspension are evaluated via hardware-in-the-loop simulation (HILS).
74 citations
TL;DR: In this article, two perspectives are examined for modeling damping performance of the ER monotube shock absorber, i.e., quasisteady Bingham plastic analysis coupled with a mechanical analysis of the leakage effects.
Abstract: Electrorheological (ER) and magnetorheological flow mode dampers can exhibit biviscous damping behavior. Such behavior is characterized by a high damping pre-yield region for low velocities, with a transition to a relatively lower post-yield damping, once the damper force exceeds the static yield force of the damper. The biviscous damping behavior is typically the result of leakage, that is, a second path of Newtonian flow in addition to the Bingham plastic flow through the ER or MR valve. We experimentally demonstrate such bilinear damping behavior in a monotube ER shock absorber. Leakage is typically introduced to smooth the force response of the damper as the damper undergoes transitions through the low velocity. The ER fluid is typically assumed to behave as a Bingham plastic fluid. Thus, two perspectives are examined for modeling damping performance of the ER monotube shock absorber. First, the quasisteady Bingham plastic analysis is coupled with a mechanical analysis of the leakage effects. Second, a biviscous constitutive perspective is described that allows the leakage effects to be described as an apparent pre-yield viscosity of the ER fluid. Both perspectives prove to be useful in describing damping performance of the ER monotube shock absorber.
74 citations
TL;DR: In this article, the authors presented a new mode coupling chatter reduction scheme by assembling an MRE absorber on the spindle to absorb vibration with a specific frequency range, and a semi-active controller was established to control the electrical current applied to the magnetorheological elastomer to trace the chatter frequency.
74 citations
TL;DR: In this paper, the authors revisited the yielding behavior of conventional magnetorheological (MR) fluids for a wide range of magnetic fields and particle concentrations under a colloidal gel perspective, and found a two-step yielding behavior at intermediate magnetic fields (∼10kA/m) that can be explained as a transition from a strong-link to a weak-link regime upon increasing the particle concentration in the MR fluid.
Abstract: The yielding behavior of conventional magnetorheological (MR) fluids is revisited for a wide range of magnetic fields and particle concentrations under a colloidal gel perspective. A two-step yielding behavior is found at intermediate magnetic fields (∼10 kA/m) that can be explained as a transition from a strong-link to a weak-link (or transition) regime upon increasing the particle concentration in the MR fluid. This two-step yielding behavior is reminiscent of the classical concepts of static (frictional) and dynamic (Bingham) yield stress. By relating macroscopic elastic properties to a scaling fractal model, we could identify the prevalent gelation regime in MR fluids.
73 citations