On the optimization of a hybrid tuned mass damper for impulse loading

Salvi, Jonathan; Rizzi, Egidio; Rustighi, Emiliano; Ferguson, N.S.

doi:10.1088/0964-1726/24/8/085010

Cited by 21 publications

(15 citation statements)

References 35 publications

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“…The dynamic response of such a structural system has been analytically obtained, through a pair of Laplace transforms, and then adopted for numerical TMD tuning purposes. This work also forms a theoretical background for a possible further upgrade of the passive TMD device to a smarter hybrid version, whose features are complementary outlined in [36].…”

Section: Resuming Technical Discussion On the Obtained Resultsmentioning

confidence: 95%

“…In this study, the optimisation of a Tuned Mass Damper control device under transient impulse excitation is developed, as an innovative part of a wider research project on the general dynamic vibration absorber tuning concept [18,51] and on the specific TMD optimisation process [37][38][39]. Particularly on TMD calibration, while TMDs have been optimised for reference loadings in [38] and for earthquake excitation in [37,39], in this paper, and in companion work [36], the innovative scenario of TMD tuning under impulse excitation is considered, here by proposing a purely passive TMD, apt to control the average structural response along the whole time window of analysis, there by outlining a hybrid TMD, relying on the present background tuning, apt to further control also the peak structural response, if made available and once turned on. That may consider the further upgrade of the present passive control device to a hybrid version, whereby an active controller may be added to the optimised passive TMD as here derived.…”

Section: Introductionmentioning

confidence: 99%

“…TMD tuning processThe present TMD tuning process can be interpreted and managed by an appropriate optimisation procedure, where the objective (or cost) function is assumed to be a quantity representative of the dynamic response of the structure, either in the time or in the frequency domain, which is supposed to be minimised[36,37]:min p J(p) , l b ≤ p ≤ u b ,(29)where p, J(p), l b and u b represent the optimisation variables, the objective function, the lower and the upper bounds on the optimisation variables, respectively. In the present context, following a typical approach adopted in the TMD literature[4,6,10,14,19,20,34,35,48], only frequency ratio f and TMD damping ratio ζ 2 are taken as variables for a time-domain optimisation process, while mass ratio µ is assumed to be given from scratch (two-variable optimisation: p = [f ; ζ 2 ]), based on values that may be encountered in real applications.…”

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confidence: 99%

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Optimum Tuning of Passive Tuned Mass Dampers for the Mitigation of Pulse-Like Responses

Salvi

Rizzi

Rustighi

et al. 2018

Journal of Vibration and Acoustics

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Tuned mass dampers (TMDs) are typically introduced and calibrated as natural passive control devices for the vibration mitigation of the steady-state response of primary structures subjected to persistent excitations. Otherwise, this work investigates the optimum tuning of TMDs toward minimizing the transient structural response. Specifically, a single-degree-of-freedom (SDOF) system is considered as a primary structure, with added TMD, subjected to pulse-like excitations. First, the system is analytically analyzed, within the time domain, for unit impulse base displacement, through Laplace transform. Then, the tuning process is numerically explored by an optimization procedure focused on an average response index, to extract the optimum condition toward best TMD calibration. The efficiency of the proposed control device is then assessed and demonstrated through further post-tuning numerical tests, by considering as dynamic loadings: first, a time unit impulse base displacement, coherent with the source description above; second, different pulse-like excitations, to detect the effectiveness of the so-conceived TMD for generic ideal shock actions; third, a set of nonstationary earthquake excitations, to enquire the achievable level of seismic isolation. It is shown that this leads to a consistent passive TMD in such a transient excitation context, apt to mitigate the average response. Additionally, the present tuning forms a necessary optimum background for a possible upgrade to a hybrid TMD, with the potential addition of an active controller to the so-optimized TMD, to achieve even further control performance, once turned on, specifically for abating the peak response, too.

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Section: Resuming Technical Discussion On the Obtained Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Optimum Tuning of Passive Tuned Mass Dampers for the Mitigation of Pulse-Like Responses

Salvi

Rizzi

Rustighi

et al. 2018

Journal of Vibration and Acoustics

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“…Besides, higher frequency responses outside the controllable frequency range of multiple TMD systems are often observed . Active and semi‐active control strategies have also been developed as force delivery devices that act simultaneously with the excitations by processing real‐time responses of the structures . Besides the separate use of actuators or magnetorheological dampers, hybrid control utilizing magnetorheological dampers coupled with TMDs has also been reported as effective seismic control schemes .…”

Section: Introductionmentioning

confidence: 99%

Multi‐objective design and performance investigation of a high‐rise building with track nonlinear energy sinks

Wang

Wierschem

Wang

et al. 2019

Structural Design Tall Build

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This paper presents a track nonlinear energy sink (track NES) and a single-sided vibroimpact track nonlinear energy sink (SSVI track NES) as effective control strategies to mitigate the seismic response of high-rise buildings. The study commences with the analytical models of the track NES and the SSVI track NES and the state-space description of the control system. Subsequently, single-objective and multi-objective optimizations are conducted, and the performance of these devices is evaluated comprehensively in terms of control effectiveness and economic factors when attached to a representative 32-story high-rise building. Numerical results show that the SSVI track NES exhibits strong robustness against changes in the structural stiffness and the input energy level. Compared with the track NES and tuned mass damper, the multio-bjectively designed SSVI track NES is shown to be the most cost-effective device because it has a very small stroke and requires only slight damping. The cost-effectiveness of the SSVI track NES is also demonstrated on a 20-story shearframe building. Additionally, the seismic performance of the SSVI track NES can be further improved by adjusting the position of the impact surface. Therefore, the track NES and, more so, the SSVI track NES can be designed as highly cost-effective control strategies and offer a promising solution for seismic response mitigation of high-rise buildings. KEYWORDSCost-effectiveness, high-rise building, multio-bjective optimization, single-sided vibro-impact, track nonlinear energy sink, tuned mass damper 1 | INTRODUCTION Structural control technologies have been widely recognized as effective solutions to enhance structural functionality and safety against natural and manmade hazards. Tuned mass dampers (TMDs) are one of the most commonly used passive vibration absorbers in engineering practice due to its relative simplicity. A TMD consists of a secondary mass connected to the controlled primary structure through a linear spring and a viscous damper. By resonating with the primary structure, the TMD is able to positively affect the dynamic property of the primary structure and dissipate energy effectively. Early applications of TMDs have been directed toward mitigation of wind-induced responses, especially for high-rise buildings and flexible structures. [1][2][3][4][5] Numerous studies have been dedicated to the optimal design of TMDs, [2][3][4]6] and there exists many examples of TMDs in super high-rise buildings, such as the Milad Tower [4] and the Shanghai World Financial Center Tower. [5] In recent studies, TMDs have also attracted interests in vibration control of structures under seismic excitations. Although a variety of numerical and experimental studies have been carried out to obtain optimal parameters of TMDs for seismic response mitigation, [6][7][8][9][10][11] shortcomings of TMDs for this purpose have also AMD Active mass damper DOF Degree of freedom EOM Equation of motion MR damper Magnetorheological damper MTMD Multiple tuned mass damper NES Non...

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“…Kamgar, Samea, and Khatibinia optimized TMDs by a critical excitation method employing improved gravitational search algorithm. In addition to classical TMD consisting of a mass, stiffness elements, and dampers, other types of TMD including nonlinear viscous damping, semi‐active TMD, hybrid TMD, eddy‐current TMD, particle TMD, and compound TMD have been also proposed.…”

Section: Introductionmentioning

confidence: 99%

Optimum design of multiple positioned tuned mass dampers for structures constrained with axial force capacity

Niğdeli

Bekdaş

2019

Structural Design Tall Build

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The stories of structure may have different and limited axial force capacity. In order to passively control the translational movement of structures, a tuned mass damper (TMD) positioned on a story may cause to exceed axial force capacity of a story.The optimum performance is achieved when all additional masses are positioned on the top story. Whereas, the top stories of structure may be constructed with lower axial force capacity than the lower stories. In that case, the maximum allowed TMD mass for upper stories may be low. In that situation, several TMDs may be positioned on several stories. In the current study, the optimum tuning of TMDs positioned on multiple stories of structure is investigated. By using small masses, it is also possible to obtain effective passive control with dampers that have small damping coefficients comparing with a single TMD on the top of the structure. The design variables of the optimization problem such as the period and damping ratio of TMD are tuned according to a metaheuristic algorithm called flower pollination algorithm. The TMD is optimized for near-fault excitations by using impulsive motions during the optimization process. The proposal was applied to four case studies. According to the results, the multiple positioned TMDs may be a practical and effective option comparing with the use of a single heavy TMDs on the top of a structure. KEYWORDS axial force, flower pollination algorithm, impulsive motions, optimization, optimum tuning, tuned mass dampers | INTRODUCTIONIn order to reduce structural vibrations originating from seismic sources, tuned mass dampers (TMDs) can be used, but the mass of the TMD must be too big to provide an effective performance on the lateral responses of the structure. Although the responses are positively affected, the fracture or ductility limit (especially for reinforced concrete structures) of vertical structural members (columns) can be exceeded. In that situation, the structural capacity must be considered as the mass limit or the structure must be retrofitted for increasing the axial force capacity. In a civil structure, the forces of upper stories are directed to a lower story. In that case, the axial force is the maximum at the lowest story. For that reason, upper stories of civil structures may be constructed by smaller cross-sections and less reinforcements than the lower stories. In that case, the axial force capacity of upper stories may be less than the capacity of the lower stories. Generally, the optimum position of a TMD is the top of the building where the first mode shape value is the maximum for the critical mode of the structure. In that case, the number of TMDs can be increased and small TMDs can be placed on multiple stories.The most important performance index of TMDs is the optimum tuning. By using multiple TMDs on different stories, it will be a more challenging optimization problem. For this problem, to use a well-known optimum frequency and damping ratio formulation will not be effective because these formulations wer...

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On the optimization of a hybrid tuned mass damper for impulse loading

Cited by 21 publications

References 35 publications

Optimum Tuning of Passive Tuned Mass Dampers for the Mitigation of Pulse-Like Responses

Optimum Tuning of Passive Tuned Mass Dampers for the Mitigation of Pulse-Like Responses

Multi‐objective design and performance investigation of a high‐rise building with track nonlinear energy sinks

Optimum design of multiple positioned tuned mass dampers for structures constrained with axial force capacity

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