Response control of irregular structures using structure-TLCD coupled system under seismic excitations

Bigdeli, Yasser; Kim, Dookie

doi:10.1007/s12205-013-1019-0

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…Despite limited number of studies on evaluation and mitigation of wind turbines under multihazard loads, during past decades, there were ongoing researches and advances in structural dynamic performance improvements of high‐rise buildings and tall structures excited by the wind load and/or seismic load. It is shown in previous studies (such as references herein) that employing external dampers is an effective method to control the vibration of lightly damped, tall, and flexible civil engineering structures . However, to design for multihazard loads, the aftereffects of applying a specific vibration mitigation method should be seen from a wider vision.…”

Section: Introductionmentioning

confidence: 96%

Vibration control in wind turbines to achieve desired system-level performance under single and multiple hazard loadings

Rezaee

Aly

2018

Struct Control Health Monit

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The increased demand in energy and the need for sustainable and renewable sources of electricity in hazardous environments with significantly growing population yields the installation of more wind turbines in these areas. In addition, the technological development in material and construction methods has led to the building of taller and more flexible turbines, with inherent low structural damping. Installing modern wind turbines in offshore harsh environments or seismic prone areas can cause an increment in the probability of failure due to excessive vibrations. The current study evaluates the performance of onshore and offshore wind turbines under multihazard loads, including wind, wave, earthquake, and mass and aerodynamic imbalances for both parked and operating conditions. The Lagrangian approach is employed to model the wind turbine considering the blade/tower coupling. In order to lessen the vibrations induced by multihazard loads, external smart dampers are used and a novel energy-based probabilistic approach is employed to tune the semiactive controllers. The results show the effectiveness of employing an analytical approach for the design of semiactive controllers in vibration mitigation of a wind turbine subjected to multiple hazards.

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Section: Introductionmentioning

confidence: 96%

Vibration control in wind turbines to achieve desired system-level performance under single and multiple hazard loadings

Rezaee

Aly

2018

Struct Control Health Monit

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“…Despite a limited number of studies on the evaluation and mitigation of wind turbines under multihazard loads, during the past decades, there were ongoing researches and advances in structural dynamic performance improvements of high-rise buildings and tall structures excited by wind and seismic loads [6][7][8][9][10][11]. It is shown in previous studies that employing external dampers is an effective method to control the vibration of lightly damped, tall, and flexible civil engineering structures [8,[12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Accelerated Controller Tuning for Wind Turbines Under Multiple Hazards

Aly¹,

Rezae²

2021

JEPT

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During their lifecycle, wind turbines can be subjected to multiple hazard loads, such as high-intensity wind, earthquake, wave, and mechanical unbalance. Excessive vibrations, due to these loads, can have detrimental effects on energy production, structural lifecycle, and the initial cost of wind turbines. Vibration control by various means, such as passive, active, and semi-active control systems provide crucial solutions to these issues. We developed a novel control theory that enables semi-active controller tuning under the complex structural behavior and inherent system nonlinearity. The proposed theory enables the evaluation of semi-active controllers’ performance of multi-degrees-of-freedom systems, without the need for time-consuming simulations. A wide range of controllers can be tested in a fraction of a second, and their parameters can be tuned to achieve system-level performance for different optimization objectives.

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“…This model accurately describes the displacements of the surface of the liquid. Bigdeli & Kim (2015) experimentally identify the inherent damping of three passive control devices: the TMD, tuned liquid damper (TLD) and TLCD, with regard to the damping effect of the mass that these constitute. For this, they use a steel three storey model subjected to dynamic excitation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a tuned liquid column damper in non-linear structures subjected to seismic excitations

Espinoza

Canal

Suazo

2018

Lat. Am. j. solids struct.

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The behavior of the tuned liquid column damper (TLCD) is analyzed in the control of non-linear structures subjected to random seismic excitations. The structure is modeled as a system of one degree of freedom with incursion in the non-linear range. The Bouc-Wen hysteretic model is used to model the non-linear behavior of the structure. A stationary stochastic analysis is performed in the domain of the frequency. An equivalent statistical linearization was used for the analysis of the main system and the TLCD. The TLCD parameters considered for the optimization process were the frequency and the head loss coefficient. Two target functions were considered, (i) reduction of the main displacement of the system, (ii) reduction of the hysteretic energy. Two random processes were considered as seismic excitation, first a broad bandwidth process and secondly a narrow bandwidth process. The results show that for a broad bandwidth process, the TLCD tends to tune with the linear equivalent frequency of the system in the case without TLCD, while for the narrow bandwidth process, it tunes (TLCD) with the dominant frequency of the input. It is seen that the TLCD becomes detuned with regard to the frequency of the structure as the structure becomes more non-linear. It is also seen that the optimal tuning ratio of the TLCD is unsensitive to the mass ratio of the device and the main damping ratio of the system. It is also concluded that in case of flexible structures, the optimal head loss coefficient tends to be lower and increases with regard to its length ratio. It is seen that the effectiveness of the TLCD is greater for higher mass ratios of the device. In addition, it is found that the optimal TLCD becomes less effective as the structure enters the non-linear range, showing lower efficiency than what is seen in the literature for optimal TLCDs in linear structures.

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Response control of irregular structures using structure-TLCD coupled system under seismic excitations

Cited by 9 publications

References 15 publications

Vibration control in wind turbines to achieve desired system-level performance under single and multiple hazard loadings

Vibration control in wind turbines to achieve desired system-level performance under single and multiple hazard loadings

Accelerated Controller Tuning for Wind Turbines Under Multiple Hazards

Analysis of a tuned liquid column damper in non-linear structures subjected to seismic excitations

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