Acceleration feedback method applied to active‐passive composite tuned mass damper

Nishimura, Isao; Sakamoto, Mitsuo; Yamada, Toshikazu; Koshika, Norihide; Kobori, Takuji

doi:10.1002/stc.4300010106

Cited by 17 publications

(10 citation statements)

References 6 publications

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“…Based on the ‘fixed‐point’ theory of Den Hartog, Ghosh and Basu presented an alternative expression for the optimum tuning ratio of the TMD, which has advantages of being applicable for damped structures. Nishimura proposed a new concept for active TMD algorithm based on the principle of the passive TMD, and discussed the optimization of the active‐passive composite TMD. Desu introduced coupled tuned mass dampers (CTMDs) and presented an efficient control strategy to reduce displacements and acceleration responses of asymmetric buildings.…”

Section: Introductionmentioning

confidence: 99%

Improving performance of a super tall building using a new eddy-current tuned mass damper

Lü

Zhang

Weng

et al. 2016

Struct. Control Health Monit.

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SUMMARYTwo kinds of methods have been primarily used to improve the vibration performance of high-rise buildings. One approach is to enhance the structural lateral stiffness, which may increase the component size and inefficiently use material. The other approach is to employ vibration control devices, such as tuned mass dampers (TMDs), tuned liquid dampers (TLD) and other supplemental damping devices. This latter approach has proved to be quite economical and efficient, and as such, increasingly used in practice. The Shanghai Center Tower (SHC) is a super high-rise landmark building in China, with a height of 632 m. In order to mitigate its vibration during wind storms, a new eddy-current TMD was installed at the 125th floor. Special protective mechanisms were incorporated to prevent excessively large amplitude motion of the TMD under extreme wind or earthquake scenarios. Results of reduced-scale laboratory tests and field tests are presented in this paper to characterize the dynamic properties of the damping device and validate the fidelity of the numerical results. Results of structural analyses indicate that for SHC the eddy-current TMD was able to reduce wind-induced structural acceleration by 45%-60% and earthquake-induced structural displacement by 5%-15%. The installation of the TMD was completed in December 2014, and the performance observed to date is judged to be good.

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Section: Introductionmentioning

confidence: 99%

Improving performance of a super tall building using a new eddy-current tuned mass damper

Lü

Zhang

Weng

et al. 2016

Struct. Control Health Monit.

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“…As was shown in [13,[18][19][20][21][22][23][24], the acceleration of the primary structure as the driving force and velocity of the TMD as the active damping force of the HTMD are two essential direct response feedback signals to improve the performance of the HTMD. Also, it was shown in [14] that the displacement and acceleration of the TMD are two feedback signals which can be used for adaptive tuning of the HTMD to deal with the problem of off-tuning of a passive TMD.…”

Section: Control Algorithmmentioning

confidence: 99%

Experimental investigation of dynamic performance of a prototype hybrid tuned mass damper under human excitation

Noormohammadi¹,

Reynolds²

2013

SPIE Proceedings

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Current sport stadia designs focus mainly on maximizing audience capacity and providing a clear view for all spectators. Hence, incorporation of one or more cantilevered tiers is typical in these designs. However, employing such cantilevered tiers, usually with relatively low damping and natural frequencies, can make grandstands more susceptible to excitation by human activities. This is caused by the coincidence between the activity frequencies (and their lowest three harmonics) and the structural natural frequencies hence raising the possibility of resonant vibration. This can be both a vibration serviceability and a safety issue.Past solutions to deal with observed or anticipated vibration serviceability problems have been mainly passive methods, such as tuned mass dampers (TMDs). These techniques have exhibited problems such as lack of performance and offtuning caused by human-structure interaction. To address this issue, research is currently underway to investigate the possible application of hybrid TMDs (HTMDs), which are a combination of active and passive control, to improve the vibration serviceability of such structures under human excitation.The work presented here shows a comparative experimental investigation of a passive TMD and a prototype HTMD applied on a slab strip structure. The most effective control algorithm to enhance the performance of the HTMD and also deal with the off-tuning problem is investigated. The laboratory structure used here is an in-situ cast simply-supported post-tensioned slab strip excited by forces from a range of human activities.

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“…i¼1 k c q i;in q i;out þ 1 2 k n;in q 2 i;in þ 1 2 k n;out q 2 i;out (9) where k e,in and k e,out represent the elastic stiffness in the in-plane and the out-of-plane directions, respectively, and are expressed as…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, if the mass ratio is small, the auxiliary system response may become very large. Therefore, free vibration of the TMD will continue for a long time after the excitation has been removed from the primary structure . Moreover, the main problem with using a passive TMD to dampen wind turbine blade motion is that there is no single dominant resonant frequency present consistently for the entire time history of the response.…”

Section: Introductionmentioning

confidence: 99%

Active tuned mass dampers for control of in-plane vibrations of wind turbine blades

Fitzgerald

Basu

Nielsen

2013

Struct. Control Health Monit.

117

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This paper investigates the use of active tuned mass dampers (ATMDs) for the mitigation of in‐plane vibrations in rotating wind turbine blades. The rotating wind turbine blades with tower interaction represent time‐varying dynamical systems with periodically varying mass, stiffness, and damping matrices. The aim of this paper is to determine whether ATMDs could be used to reduce in‐plane blade vibrations in wind turbines with better performance than compared with their passive counterparts. A Euler–Lagrangian wind turbine mathematical model based on energy formulation was developed for this purpose, which considers the structural dynamics of the system and the interaction between in‐plane and out‐of‐plane vibrations. Also, the interaction between the blades and the tower including the tuned mass dampers is considered. The wind turbine with tuned mass dampers was subjected to gravity, centrifugal, and turbulent aerodynamic loadings. Investigations show promising results for the use of ATMDs in the vibration control of wind turbine blades. Copyright © 2013 John Wiley & Sons, Ltd.

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Acceleration feedback method applied to active‐passive composite tuned mass damper

Cited by 17 publications

References 6 publications

Improving performance of a super tall building using a new eddy-current tuned mass damper

Improving performance of a super tall building using a new eddy-current tuned mass damper

Experimental investigation of dynamic performance of a prototype hybrid tuned mass damper under human excitation

Active tuned mass dampers for control of in-plane vibrations of wind turbine blades

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