Experimental evaluation of a simple electroviscous damper

Stevens, N.G.; Sproston, J.L.; Stanway, R.

doi:10.1016/0304-3886(84)90013-5

Cited by 30 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Vibration control appears to be one of the more promising areas of application of ER fluids since the required force levels, for example in some areas of the automotive and industrial sectors, are of a magnitude which falls within the range of static yield stresses exhibited by commercially available fluids (Stevens et al 1984, Morishita and Mitsui 1992, Khusid et al 1997. There are, however, many other areas where the yield stress is not sufficient and this is particularly so when the fluid is used in simple shearing.…”

Section: Introductionmentioning

confidence: 99%

The performance of an electrorheological fluid in dynamic squeeze flow under constant voltage and constant field

Wahed

Sproston

Stanway

1998

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

This paper is concerned with an experimental investigation in which an electrorheological (ER) fluid is applied to control vibration. The fluid is sandwiched between two planar electrodes, the upper one fixed while the lower one is subjected to an oscillatory sinusoidal motion and is energized either by a constant voltage or by a constant field. In this dynamic squeeze flow it is seen that the force transmitted across the fluid is greater when the applied electrical field is maintained at a constant level, controlled with reference to the instantaneous gap between the electrodes. In addition, we compare the experimental results with those from an existing theoretical model in which the fluid is assumed to have a bi-viscous rheological characteristic.

show abstract

Section: Introductionmentioning

confidence: 99%

The performance of an electrorheological fluid in dynamic squeeze flow under constant voltage and constant field

Wahed

Sproston

Stanway

1998

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…As the ground motion strikes the structure the mass is in motion. Assuming that the ground moves to the positive displacements the motion of the structure is initially described with equation (17). Stepping through time, a zero-velocity point is reached.…”

Section: Analysis Of Response With Coulomb Frictionmentioning

confidence: 99%

Rigidity-Plasticity-Viscosity: Can Electrorheological Dampers Protect Base-Isolated Structures From Near-Source Ground Motions?

Makris

1997

Earthquake Engng. Struct. Dyn.

264

133

View full text Add to dashboard Cite

SUMMARYThe concept of seismic protection by lengthening the fundamental period of the structure has been implemented through a number of isolation systems. While flexible isolation systems can effectively protect structures from earthquakes containing high frequencies and sharp accelerations, they might amplify the response of the structure when subjected to rapid, long-period motions. In this case of long period excitations the stiff superstructure should be 'locked' to the ground, rather than be supported on flexible bearings. This paper shows through a comprehensive analytical study that a practical solution to this problem is to provide additional rigidity to the structure using a friction-type mechanism (rigid-plastic behaviour). The presence of friction-type forces reduce substantially the relative displacements of a singledegree-of-freedom structure by keeping accelerations at low levels; however, they are responsible for the presence of permanent displacements. Accordingly, the use of controllable fluid dampers is proposed and it is shown that they can be a practical solution to the problem. The response of a single-degree-of-freedom base-isolated structures is investigated, and the feasibility of a proposed electrorheological damper to deliver the required forces is discussed.1997 by John Wiley & Sons, Ltd.

show abstract

“…Since these controllable fluid concepts do not require moving parts such as valves, they have been embraced as a viable technology for application in civil engineering structures. Currently, two forms of controllable fluid semi-active dampers are currently being investigated in the United States: the ER (Stevens et al 1984, Gavin & Hanson 1994, Morishita & Mitshi 1992, Morishita & Ura 1993, Makris et al 1995 and MR (Spencer et al 1996) dampers which are capable of producing control performance comparable to active systems without the requirement for large power sources, nor the potential risks involved with introducing additional energy into the system. The "smart" fluids, which provide the energy dissipative mechanism for these devices, develop resistive forces under the application of an electrical or magnetic field, as their respective names suggest.…”

Section: Electrorheological (Er)/magnetorheological (Mr) Dampersmentioning

confidence: 99%

Mitigation of motions of tall buildings with specific examples of recent applications

Kareem¹,

Kijewski²,

Tamura³

1999

Wind and Structures

351

169

View full text Add to dashboard Cite

Flexible structures may fall victim to excessive levels of vibration under the action of wind, adversely affecting serviceability and occupant comfort. To ensure the functional performance of flexible structures, various design modifications are possible, ranging from alternative structural systems to the utilization of passive and active control devices. This paper presents an overview of state-of-the-art measures to reduce structural response of buildings, including a summary of recent work in aerodynamic tailoring and a discussion of auxiliary damping devices for mitigating the wind-induced motion of structures. In addition, some discussion of the application of such devices to improve structural resistance to seismic events is also presented, concluding with detailed examples of the application of auxiliary damping devices in Australia, Canada, China, Japan, and the United States.

show abstract

Experimental evaluation of a simple electroviscous damper

Cited by 30 publications

References 3 publications

The performance of an electrorheological fluid in dynamic squeeze flow under constant voltage and constant field

The performance of an electrorheological fluid in dynamic squeeze flow under constant voltage and constant field

Rigidity-Plasticity-Viscosity: Can Electrorheological Dampers Protect Base-Isolated Structures From Near-Source Ground Motions?

Mitigation of motions of tall buildings with specific examples of recent applications

Contact Info

Product

Resources

About