Positioning and tuning of viscous damper on flexible structure

Engelen, Kurt; Ramón, Herman; Saeys, Wouter; Franssens, Wouter; Anthonis, Jan

doi:10.1016/j.jsv.2007.03.020

Cited by 17 publications

(11 citation statements)

References 8 publications

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“…considered the first three modes of a beam model with a damper attached. By using a numerical method, the optimal damper size for a maximum system damping ratio was obtained (Engelen et al ., ). Lee proposed an analytical model to analyse the deformations of high‐rise wall‐frame structure under lateral force.…”

Section: Introductionmentioning

confidence: 97%

A simplified model for analysis of high‐rise buildings equipped with hysteresis damped outriggers

Deng

Pan

Lam

et al. 2013

Structural Design Tall Build

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A simplified model is developed to estimate the seismic response of high-rise buildings equipped with hysteresis damped outriggers. In the simplified model, the core tube is considered as a cantilever beam, and the effects of outriggers on the core tube are considered as concentrated moments. Modal decomposition method is adopted to obtain the seismic response of the simplified model. To investigate the accuracy and effectiveness of the simplified model, a high-rise building with a height of 160 m was adopted as the example structure, and its response subjected to a ground motion was analyzed using the simplified model. A corresponding finite element model was built and analyzed by a finite element program called SAP2000 (Computers and Structures, Inc. Berkeley, California, United States). The analysis results obtained from the two models were compared. To consider the randomness of the ground motion, comparisons between the two models were further conducted using another 22 ground motions. It is found that the analysis results obtained from the simplified model agree well with those obtained from the finite element model, and the computation time used for the simplified model is almost negligible compared to that used for the finite element model. Such observations demonstrate that the simplified model is accurate and effective.

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Section: Introductionmentioning

confidence: 97%

A simplified model for analysis of high‐rise buildings equipped with hysteresis damped outriggers

Deng

Pan

Lam

et al. 2013

Structural Design Tall Build

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“…The dynamic behavior of a structure with attached viscous dampers can be easily investigated through transfer functions or state space theory (Preumont et al., 2002; Engelen, 2007; Preumont, 2011), if a spatial discretization technology, e.g. the popular finite element method (FEM), is implemented.…”

Section: Introductionmentioning

confidence: 99%

“…This method was then employed to investigate the spatial average response (Jacquot, 2003) and the optimal location of the viscous damper (Jacquot, 2004). Working with transfer functions, Engelen et al. (2007) obtained the eigenvalues by solving the root locus of the transfer function.…”

Section: Introductionmentioning

confidence: 99%

A beam with arbitrarily placed lateral dampers: Evolution of complex modes with damping

Chen

McFarland

Spencer

et al. 2016

Journal of Vibration and Control

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Free vibration of a beam with multiple arbitrarily placed lateral viscous dampers is investigated to gain insight into the intrinsic dynamic features of non-proportional damped systems. In terms of virtual boundary condition method, complex modes of a damper-beam system are achieved, and the solution is also suitable for the beams that have different boundary conditions. The features of the wave numbers satisfying the frequency equation were discussed in theory. The orthogonality analysis conducted in this paper provides two orthogonality conditions for complex modes. Pseudoundamped natural frequencies, damping ratios and complex modes are surveyed via numerical study. The analysis on the evolution of complex modes shows that the increasing damping would lead to over damped modes, and the mode shape that corresponds to the small one of a pair of real-valued natural frequencies is close to the static deformation shape of a beam subjected to static forces located at the positions of the dampers. For the rest modes that would never be over damped with increasing damping, the mode shapes and corresponding psuedoundamped natural frequencies will converge to that of a beam with rolling supports located at where dampers are placed. The exact solution of free vibration of a multiple-span beam is presented in addition.

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“…Lavan and Levy [6] proposed a method for the optimal design of viscous dampers based on a global damage index. Interesting studies concerning the allocation and sizing of viscous dampers are presented by Main and Krenk [7] and by Engelen et al [8]. Reference [9] investigates the optimal distribution of viscous dampers by an objective function in the form of a sum of weighted non-dimensional modal damping ratios.…”

Section: Introductionmentioning

confidence: 99%

Optimal locations for MR dampers in civil structures using improved Ant Colony algorithm

Amini¹,

Ghaderi²

2011

Optim Control Appl Methods

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SUMMARYThis paper studies a design problem concerning installation locations for a number of structural magnetorheological (MR) dampers. The mechanical characteristic of each MR damper is functional dependent to an input current, which is regulated by a Fuzzy Logic controller. It is demanded that the chosen arrangement of dampers should change the dynamic response of the structure to meet certain constraints expressed in terms of minimization of an objective function. For this purpose, an improved version of Ant Colony Optimization algorithm is presented. The modified algorithm also utilizes additional heuristic data derivable from a pre-analysis of the structure in the optimization procedure. Further improvements regarding convergence speed of search algorithm are proposed as well, provided numerical examples study the functionality of the algorithm in different cases. With an acceptable probability from a structural designer's point of view, the proposed method finds qualified solutions during a reasonable number of search iterations.

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Positioning and tuning of viscous damper on flexible structure

Cited by 17 publications

References 8 publications

A simplified model for analysis of high‐rise buildings equipped with hysteresis damped outriggers

A simplified model for analysis of high‐rise buildings equipped with hysteresis damped outriggers

A beam with arbitrarily placed lateral dampers: Evolution of complex modes with damping

Optimal locations for MR dampers in civil structures using improved Ant Colony algorithm

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