Selective controlled base isolation system with magnetorheological dampers

Ribakov, Yuri; Gluck, J.

doi:10.1002/eqe.164

Cited by 23 publications

(13 citation statements)

References 16 publications

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“…And the damping s and control current as shown in Figure. In figure9 and figure.1O,it indicates that the corrected Frequency (Hz) coefficients Cs C are not only influenced by the Figure. 12.Actual power spectrum ot damping force control current, but also the exciting frequency. (1) Cs increases when the current increase, but x 10x n~~~~~~~~~1 8 decreases gradually with the increase of frequency, when the frequency is high, it doesn't change any more. 16 (2) For the Cp, it decreases with the increase of current, 14 12 and there is a peak value at some frequency when changing the frequency, the reason is that it is influenced by the air ' 10 bubble or sedimentation of MR. M a In order to better express the actual output force of damper with the corrected formula, the following example takes exciting force of 24000N and the exciting frequency of 3Hz.…”

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confidence: 84%

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Research on the Low-frequency Mechanical Characteristics of MR Damper in Ship Isolator

Yao¹,

Tian²,

Shen³

et al. 2007

2007 IEEE Vehicle Power and Propulsion Conference

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In this paper, by using the fast response, controllable isolator system. In this paper, a series of characteristics curves damp, small consume, wide dynamic scope, great adaptation of of MR damper are obtained through the vibration experiment the MR damper, a new isolator composed of steel rope spring and on isolator system. According to the experimental results, the MR damper is designed and a study on the low-frequency relations of damping force and its influencing factors are mechanics characteristics of MR damper in isolator is carried out, analyzed and some useful conclusions are obtained, which is then the relations between MR damping force and other factors very significant to practical application of MR damper on ship.are analyzed with experimental data, it shows that damping force not only has something to do with structural dimension, but also is related to controllable current and vibration frequency. Finally, II. EXPENRIMENTAL PLAN the experiential formula of damping force is corrected and the In this paper, the ship isolator is designed to study the relations between corrected coefficients and factors are obtained. mechanical characteristics of MR damper, it makes sense to practical application of isolator .To solve this problem, a new Keywords-ship isolator; maganeto fi dship isolator composed of traditional vibration absorber and low-frequency; mechanical characteristics power component in parallel is presented as shown in Figl, of which the dynamic characteristics can be controllable, so that it

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confidence: 84%

“….ur 5 In fiur 6 shwte 2ltlnhp mn current controllable mass and stlmulatlon force Fo.rret 1 Figure.8), which shows that experiential formula…”

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confidence: 93%

Research on the Low-frequency Mechanical Characteristics of MR Damper in Ship Isolator

Yao¹,

Tian²,

Shen³

et al. 2007

2007 IEEE Vehicle Power and Propulsion Conference

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“…The utilization of MRFs has been increasing in the different semi-active damping control applications in the low to moderate frequency ranges, including automotive suspension 28 , civil structures [29][30][31][32] , fluid clutches 33 , optical polishing 34 and a variety of aerospace applications [35][36][37][38] , vibration isolation 39,40 , automobile valves 41 and automotive damping applications 42 . Lord Corporation, the leading supplier of commercially proven MR fluids, devices and systems, manufactures three different MR fluids namely LORD MRF-122EG, LORD MRF-132DG and LORD MRF-140CG (ref.…”

Section: Studies On Mr Fluidsmentioning

confidence: 99%

Developments in Vibration Control of Structures and Structural Components with Magnetorheological Fluids

Raju¹,

Varma²

2017

Current Science

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Vibration isolation and control of structures subjected to different types of dynamic loads due to periodic forces, impact and shock type forces and earthquake forces is an important area in structural engineering. The structures can be machine foundations, buildings, bridges, towers, automobiles, ship structures, military tanks and aeronautical structures. Some of these devices used are elastic springs, viscoelastic dampers, viscous fluid dampers, magnetorheological dampers and friction dampers. This article gives latest developments in vibration control of structures and structural components using magnetorheological fluids. The current status of technology and further research requirements to be studied in these areas are highlighted.Keywords: Automobile brakes, magnetorheological fluids, structure and structural components, suspension systems, vibration control.IMPROVEMENT in manufacturing technology has provided machines of higher ratings, longer bridges, taller buildings which requires to satisfy the static, dynamic capacity and serviceability and stability limits for members/ systems prescribed by codes of practice. These machines/ structures give rise to considerable higher dynamic forces and thereby higher stresses. This demands development of advanced control and safety systems to keep the structural members/systems static and dynamic responses within tolerable levels. The performance, safety and stability of structures supporting the machines/structures depend largely on their design of suspension systems and their interaction with the environment. In this article, current status of technology in development of magnetorheological and friction dampers and their use in vibration control of structural and structural components in different fields of engineering applications are presented.

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“…It was shown that the controller was effective in reducing the base displacements and interstory drifts without increasing fl oor accelerations. Ribakov and Gluck (2002), Loh et al (2003), Choi et al (2008) investigated the application of a semi-active control method utilizing a magnetorheological (MR) damper to reduce the response of an isolated structure subjected to earthquake excitations. Selective and fuzzylogic control algorithms were applied for calculating the damping required forces.…”

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confidence: 99%

Reduction of structural response to near fault earthquakes by seismic isolation columns and variable friction dampers

Ribakov

2010

Earthq. Engin. Engin. Vib.

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This paper focuses on the investigation of a hybrid seismic isolation system with passive variable friction dampers for protection of structures against near fault earthquakes. The seismic isolation can be implemented by replacing the conventional columns fi xed to the foundations by seismic isolating ones. These columns allow horizontal displacement between the superstructure and the foundations and decouple the building from the damaging earthquake motion. As a result, the forces in the structural elements decrease and damage that may be caused to the building by the earthquake signifi cantly decreases. However, this positive effect is achieved on account of displacements occurring in the isolating columns. These displacements become very large when the structure is subjected to a strong earthquake. In this case, impact may occur between the parts of the isolating column yielding their damage or collapse. In order to limit the displacements in the isolating columns, it is proposed to add variable friction dampers. A method for selecting the dampers' properties is proposed. It is carried out using an artifi cial ground motion record and optimal active control algorithm. Numerical simulation of a sevenstory structure shows that the proposed method allows effi cient reduction in structural response and limits the displacements at the seismic isolating columns.

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Selective controlled base isolation system with magnetorheological dampers

Cited by 23 publications

References 16 publications

Research on the Low-frequency Mechanical Characteristics of MR Damper in Ship Isolator

Research on the Low-frequency Mechanical Characteristics of MR Damper in Ship Isolator

Developments in Vibration Control of Structures and Structural Components with Magnetorheological Fluids

Reduction of structural response to near fault earthquakes by seismic isolation columns and variable friction dampers

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