Topic
Damper
About: Damper is a research topic. Over the lifetime, 36027 publications have been published within this topic receiving 282648 citations.
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01 Jan 1996
TL;DR: In this article, a new model for controllable fluid dampers is proposed that can effectively portray the behavior of a typical magnetorheological damper and compared with experimental results for a prototype damper indicates that the model is accurate over a wide range of operating conditions.
Abstract: Semi-active control devices have received significant attention in recent years because they offer the adaptability of active control devices without requiring the associated large power sources. Magnetorheological (MR) dampers are semi-active control devices that use MR fluids to produce controllable dampers. They potentially offer highly reliable operation and can be viewed as fail-safe in that they become passive dampers should the control hardware malfunction. To develop control algorithms that take maximum advantage of the unique features of the MR damper, models must be developed that can adequately characterize the damper’s intrinsic nonlinear behavior. Following a review of several idealized mechanical models for controllable fluid dampers, a new model is proposed that can effectively portray the behavior of a typical magnetorheological damper. Comparison with experimental results for a prototype damper indicates that the model is accurate over a wide range of operating conditions and is adequate for control design and analysis.
710 citations
TL;DR: A detailed literature review of semi-active control systems is provided in this article, which provides references to both theoretical and experimental research but concentrates on describing the results of experimental work, focusing on descriptions of the dynamic behavior and distinguishing features of various systems which have been experimentally tested both at the component level and within small-scale structural models.
656 citations
TL;DR: In this article, the performance of a number of recently proposed semi-active control algorithms for use with multiple magnetorheological (MR) dampers is evaluated through a numerical example, and the advantages of each algorithm are discussed.
Abstract: This paper presents the results of a study to evaluate the performance of a number of recently proposed semiactive control algorithms for use with multiple magnetorheological (MR) dampers. Various control algorithms used in recent semiactive control studies are considered including the Lyapunov controller, decentralized bang-bang controller, modulated homogeneous friction algorithm, and a clipped optimal controller. Each algorithm is formulated for use with the MR damper. Additionally, each algorithm uses measurements of the absolute acceleration and device displacements for determining the control action to ensure that the algorithms could be implemented on a physical structure. The performance of the algorithms is compared through a numerical example, and the advantages of each algorithm are discussed. The numerical example considers a six-story structure controlled with MR dampers on the lower two floors. In simulation, an El Centro earthquake is used to excite the system, and the reduction in the drif...
633 citations
TL;DR: In this paper, the performance of magnetorheological dampers for seismic response reduction is examined and the results indicate that the MR damper is quite effective for structural response reduction over a wide class of seismic excitations.
Abstract: In this paper, the efficacy of magnetorheological (MR) dampers for seismic response reduction is examined. To investigate the performance of the MR damper, a series of experiments was conducted in which the MR damper is used in conjunction with a recently developed clipped-optimal control strategy to control a three-story test structure subjected to a one-dimensional ground excitation. The ability of the MR damper to reduce both peak responses, in a series of earthquake tests, and rms responses, in a series of broadband excitation tests, is shown. Additionally, because semi-active control systems are nonlinear, a variety of disturbance amplitudes are considered to investigate the performance of this control system over a variety of loading conditions. For each case, the results for three clipped-optimal control designs are presented and compared to the performance of two passive systems. The results indicate that the MR damper is quite effective for structural response reduction over a wide class of seismic excitations.
574 citations
Patent•
08 Mar 1994TL;DR: In this paper, an intervertebral stabilization device made in the form of a damper adapted to resist elastically, on the one hand, an elongation and axial compression without buckling, as well as at least two implants anchored on two adjacent vertebrae.
Abstract: An intervertebral stabilization device is disclosed, made in the form of a damper adapted to resist elastically, on the one hand, an elongation and, on the other hand, an axial compression without buckling, as well as of at least two implants anchored on two adjacent vertebrae.
469 citations