Seismic Performance of Tuned Mass Dampers

Adam, Christoph; Furtmüller, Thomas

doi:10.1007/978-3-211-99484-9_2

Cited by 21 publications

(19 citation statements)

References 7 publications

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“…In structural control engineering, the mass ratio, μ, is defined as the ratio of the TMD mass to the first modal mass of the tower‐RNA structure (M tmd /M 1st modal mass ). Previous research conducted by Adam and Furtmüller pointed out that a range of mass ratios of 2% to 8% are considered to be the practically applicable range for structural control . In addition, He et al concluded that the suppression rates of the vibration response for OWTs vary according to the TMD mass from 0.5% to 2% of the entire mass (tower‐RNA structure).…”

Section: Modeling Of Tmds In Fastv8mentioning

confidence: 99%

An investigation on the impacts of passive and semiactive structural control on a fixed bottom and a floating offshore wind turbine

et al. 2019

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The application of structural control to offshore wind turbines (OWTs) using tuned mass dampers (TMDs) has shown to be effective in reducing the system loads. The parameters of a magnetorheological (MR) damper modeled by the Bouc‐Wen model are modified to utilize it as a damping device of the TMD. Rather than showcasing the intricate design policy, this research focuses on the availability of the MR damper model on TMDs and its significance on structural control. The impact of passive and semiactive (S‐A) TMDs applied to both fixed bottom and floating OWTs is evaluated under the fatigue limit state (FLS) and the ultimate limit state (ULS). Different S‐A control logics based on the ground hook (GH) control policy are implemented, and the frequency response of each algorithm is investigated. It is shown that the performance of each algorithm varies according to the load conditions such as a normal operation and an extreme case. Fully coupled time domain simulations are conducted through a newly developed simulation tool, integrated into FASTv8. Compared with the passive TMD, it is shown that the S‐A TMD results in higher load reductions with smaller strokes under both the FLS and the ULS conditions. The S‐A TMD using displacement‐based GH control is capable of reducing the fore‐aft and side‐to‐side damage equivalent loads for the monopile by approximately 12% and 64%, respectively. The ultimate loadings at the tower base for the floating substructure are reduced by 9% with the S‐A TMD followed by inverse velocity‐based GH control (IVB‐GH).

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Section: Modeling Of Tmds In Fastv8mentioning

confidence: 99%

An investigation on the impacts of passive and semiactive structural control on a fixed bottom and a floating offshore wind turbine

et al. 2019

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“…If the knowledge about the parameter a consists in a nominal value a and a coefficient of variation υ, the standard deviation can be computed as σ = aυ, and the Tchebycheff random set is defined by equation (12). If the information consists in a nominal value a and a q × 100 per cent range of variablilty, i.e.…”

Section: Random Sets Constructed From Tchebycheff's Inequalitymentioning

confidence: 99%

“…The performance of TMDs has been investigated in a series of studies, and several strategies for optimal tuning of TMDs under different types of excitations have been proposed, see, for example, [6,[7][8][9][10][11][12]. However, the robustness of TMDs with uncertain parameters against detuning in combination with stochastically excited structural vibrations is still an open question [5].…”

Section: Tmdmentioning

confidence: 99%

Efficiency of tuned mass dampers with uncertain parameters on the performance of structures under stochastic excitation

Schmelzer

Oberguggenberger

Adam

2010

Proceedings of the Institution of Mechanical Engineers, Part O:

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Tuned mass dampers serve the purpose of damping vibrations of structures such as earthquake-induced vibrations. In their design, two types of uncertainty are relevant: the stochastic excitation (e.g. earthquake record) and the inherent uncertainty of internal parameters of the devices themselves. This paper presents a new framework that admits the combination of stochastic processes and interval-type parameter uncertainty, modelled by random sets. The approach is applied to show how the efficiency of tuned mass dampers can be realistically assessed in the presence of uncertainty.

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“…Casciati and Giuliano discussed the effectiveness of the TMD for the reduction of the gust response in the towers of suspension bridges. Adam investigated the seismic performance of the TMD based on a set of 40 recorded ground motions.…”

Section: Introductionmentioning

confidence: 99%

“…Casciati and Giuliano 19 discussed the effectiveness of the TMD for the reduction of the gust response in the towers of suspension bridges. Adam 20 investigated the seismic performance of the TMD based on a set of 40 recorded ground motions. For the classic system with an undamped structure, Krenk adopted a frequency analysis method to identify the optimal parameters of the TMD and found that the classic tuning frequency led to equal modal damping and a confluence point in the frequency locus.…”

Section: Introductionmentioning

confidence: 99%

Tuned mass damper on a damped structure

Fang

Liu

Zhang

et al. 2019

Struct Control Health Monit

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Summary The classic design of the tuned mass damper on an undamped structure is based on the “fixed‐point” theory introduced by Den Hartog. Because of the lack of fixed points in the dynamic amplification of damped structures, a generalization of previous methods is presented in this study to identify the optimal parameters of the damper. The optimal frequency is identified by analyzing complex natural frequencies. The resulting frequency leads to a confluence point in the complex frequency locus and an equal modal damping ratio for the two vibration modes, provided that the damping ratio of the damper is less than a critical value. This critical value can be used as an upper bound of the damping ratio value in practice that can effectively restrict the relative motion of the damper. The optimal damping ratio is identified by ensuring that the dynamic amplification reaches an extremum value at a reference frequency. It is demonstrated that the resulting damping ratio accounts for the reduction in the motion of the primary structure and relative motion of the damper. Furthermore, a modified design procedure is proposed to determine the optimal parameters of the damper for damped structures with multiple degrees of freedom. Several numerical experiments indicate the efficiency of the proposed parameters and design procedure.

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Seismic Performance of Tuned Mass Dampers

Cited by 21 publications

References 7 publications

An investigation on the impacts of passive and semiactive structural control on a fixed bottom and a floating offshore wind turbine

An investigation on the impacts of passive and semiactive structural control on a fixed bottom and a floating offshore wind turbine

Efficiency of tuned mass dampers with uncertain parameters on the performance of structures under stochastic excitation

Tuned mass damper on a damped structure

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