Rheological Characteristics of ER Fluids and Their Application to Anti-Vibration Devices with Control Mechanism for Automobiles

Ushijima, Takao; Takano, Kazuya; Noguchi, T.

doi:10.4271/881787

Cited by 15 publications

(7 citation statements)

References 1 publication

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“…Electro-rheological (ER) and magneto-rheological (MR) fluids are two types of smart materials that have been extensively used in semi-active vibration isolators. Although ER fluid has a longer history in literature [23][24][25], it does not attract that much attention in real application because of high voltage requirement, low shear strength, and limited operating temperature comparing to MR fluid [26]. Moreover, MR technology is more reliable and provides more flexible control capabilities in design which makes it easy to implement.…”

Section: Introductionmentioning

confidence: 95%

Semi-active engine mount design using auxiliary magneto-rheological fluid compliance chamber

Mansour

Arzanpour

Golnaraghi

et al. 2010

Vehicle System Dynamics

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Engine mounts are used in the automotive industry to isolate engine and chassis by reducing the noise and vibration imposed from one to the other. This paper describes modelling, simulation and design of a semi-active engine mount that is designed specifically to address the complicated vibration pattern of variable displacement engines (VDE). The ideal isolation for VDE requires the stiffness to be switchable upon cylinder activation/deactivation operating modes. In order to have a modular design, the same hydraulic engine mount components are maintained and a novel auxiliary magnetorheological (MR) fluid chamber is developed and retrofitted inside the pumping chamber. The new compliance chamber is a controllable pressure regulator, which can effectively alter the dynamic performance of the mount. Switching between different modes happens by turning the electrical current to the MR chamber magnetic coil on and off. A model has been developed for the passive hydraulic mount and then it is extended to include the MR auxiliary chamber as well. A proof-of-concept prototype of the design has been fabricated which validates the mathematical model. The results demonstrate unique capability of the developed semi-active mount to be used for VDE application.

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Section: Introductionmentioning

confidence: 95%

Semi-active engine mount design using auxiliary magneto-rheological fluid compliance chamber

Mansour

Arzanpour

Golnaraghi

et al. 2010

Vehicle System Dynamics

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show abstract

“…There are several ways to change the notch frequency location. Some of these ways are based on using smart materials such as electrorheological fluids [7][8][9], magneto-rheological fluids [5,10,11] and shape memory alloys [12] in the hydraulic engine mount design. In some other works, different mechanisms [6,[13][14][15] has been utilized to change the engine mount dynamic properties.…”

Section: Introductionmentioning

confidence: 99%

Two-Mode Operation Engine Mount Design for Automotive Applications

Tikani

Vahdati

Ziaei-Rad

2012

Shock and Vibration

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Hydraulic engine mounts are applied to the automotive applications to isolate the chassis from the high frequency noise and vibration generated by the engine as well as to limit the engine shake motions resulting at low frequencies. In this paper, a new hydraulic engine mount with a controllable inertia track profile is proposed and its dynamic behavior is investigated. The profile of the inertia track is varied by applying a controlled force to a cylindrical rubber disk, placed in the inertia track. This design provides a hydraulic engine mount design with an adjustable notch frequency location and also damping characteristics in shake motions. By using a simple control strategy, the efficiency of the proposed hydraulic engine mount in two-mode operation meaning isolating mode in the highway driving condition and damping mode in the shock motions, is investigated.

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“…Because of their rapid change in viscosity properties when an electric or magnetic field is applied, smart materials can be used to control the damping of an isolation system. However, the ERF requires a high voltage and a high electric intensity in a long work period [9,10]. The MRF, on the other hand, only needs a little drive current and voltage in its work time [11].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical fuzzy control for engine isolation via magnetorheological fluid mounts

Chen

Liao

2009

Proceedings of the Institution of Mechanical Engineers, Part D:

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An engine isolation system via tuneable damping mounts can contribute to enhanced automobile performance. In this study, a magnetorheological fluids (MRF) mount in squeeze mode for engine isolation is proposed and its damping characteristics are analysed. Based on an engine isolation dynamic model with three degrees of freedom, a hierarchical fuzzy control (HFC) system is proposed to decrease the vertical vibration force and roll moment transmitted from an engine to a foundation. On the control level, a fuzzy controller is designed to isolate the engine vertical vibration. On the coordination level, fuzzy reasoning is adopted to realize a coordination strategy for tuning the damping of each MRF mount in order to minimize the transmitted torque. The simulation is developed in MATLAB, and the experimental isolation system for an actual engine is built in the laboratory. With wide excitation frequency inputs under different operation conditions, studies on different engine mount isolation systems are carried out. Simulation results indicate that MRF mounts using the HFC strategy have more advantages than passive elastomeric mounts or hydraulic mounts, especially in the low-frequency range. Laboratory results confirm that the engine HFC system via MRF mounts performs markedly better than the passive mount system. The absolute force transmissibility ratio and torque transmissibility ratio are reduced to lower than 0.3 in actual complex excitation, which is very significant for an improvement in noise, vibration, and harshness.

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Rheological Characteristics of ER Fluids and Their Application to Anti-Vibration Devices with Control Mechanism for Automobiles

Cited by 15 publications

References 1 publication

Semi-active engine mount design using auxiliary magneto-rheological fluid compliance chamber

Semi-active engine mount design using auxiliary magneto-rheological fluid compliance chamber

Two-Mode Operation Engine Mount Design for Automotive Applications

Hierarchical fuzzy control for engine isolation via magnetorheological fluid mounts

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