Experimental and analytical study on vibration control effects of eddy-current tuned mass dampers under seismic excitations

Lu, Zheng; Huang, Biao; Zhang, Qi

doi:10.1016/j.jsv.2017.10.035

Cited by 61 publications

(22 citation statements)

References 27 publications

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“…Bae et al [24] applied a lightweight TMD with the ECD to a large beam structure, showing that the efficiency of the TMD in vibration attenuation was increased using the ECD. Lu et al [25] estimated the effectiveness and performance of the EC- China, with a mainland coastline of more than 18,000 km in length, has particularly rich offshore wind resources, which play important roles in accelerating the progress of green and renewable energy supply [7]. Nevertheless, the development of offshore wind power can face extreme winds.…”

Section: Introductionmentioning

confidence: 99%

Application of an Eddy Current-Tuned Mass Damper to Vibration Mitigation of Offshore Wind Turbines

et al. 2018

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Offshore wind turbine (OWT) structures are highly sensitive to complex ambient excitations, especially extreme winds. To mitigate the vibrations of OWT structures under windstorm or typhoon conditions, a new eddy current with tuned mass damper (EC-TMD) system that combines the advantages of the eddy current damper and the tuned mass damper is proposed to install at the top of them. In the present study, the electromagnetic theory is applied to estimate the damping feature of the eddy current within the EC-TMD system. Then, the effectiveness of the EC-TMD system for vibration mitigation is demonstrated by small-scale tests. Furthermore, the EC-TMD system is used to alleviate structural vibrations of the OWT supported by composite bucket foundations (CBF) under extreme winds at the Xiangshui Wind Farm of China. It is found that the damping of the EC-TMD system can be ideally treated as having linear viscous damping characteristics, which are influenced by the gaps between the permanent magnets and the conductive materials as well as the permanent magnet layouts. Meanwhile, the RMS values of displacements of the OWT structure can be mitigated by 16% to 28%, and the acceleration can also be reduced significantly. Therefore, the excellent vibration-reducing performance of the EC-TMD system is confirmed, which provides meaningful guidance for application in the practical engineering of OWTs.

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Section: Introductionmentioning

confidence: 99%

Application of an Eddy Current-Tuned Mass Damper to Vibration Mitigation of Offshore Wind Turbines

et al. 2018

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“…When the ultimate load was almost arrived, these discontinuous cracks gradually penetrated into the whole specimen, and several main The specimen was instrumented with two linear variable differential transformers (LVDTs), one for loading control and the other for displacement recording. One end of the LVDTs were connected to the specimen, and the other were connected to the base beam to eliminate the influence of relative displacement [30][31][32][33]. The average shear displacement of the infill wall was measured by diagonally placed dial gauges.…”

Section: Loading Process and Damage Behaviormentioning

confidence: 99%

Seismic Performance of a New Type of Fabricated Tie-Column

et al. 2018

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Abstract:The reinforced concrete (RC) frames infilled with masonry walls are widely used in buildings. It has been well recognized that the arrangement of tie-columns can improve the wall integrity and seismic performance. However, the existing cast-in-situ tie-column (CSTC) has some problems, and a new type of fabricated tie-column (FTC) which can be recycled for secondary use is proposed in this study. Two specimens, the wall constrained by the cast-in-situ tie-columns (W-CSTC) and the wall constrained by the fabricated tie-columns (W-FTC), were designed and constructed. Low cyclic loading tests were carried out and some parameters, such as the failure modes, hysteretic curves and so forth, were used to evaluate the applicability of the FTC. The results show the W-FTC has a certain initial stiffness and strength, favorable deformation capacity, and the FTC can not only enhance the wall integrity to meet the functional requirements of tie-columns, but also solve the connection problems and reduce the adverse effects on the frame structure.

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“…[13][14][15][16] The foremost TMD device developed by Frahm 17 in 1909 does not include the inherent damping and only works in a narrow frequency range around the resonant frequency. 10 To increase the robustness and control performance of TMD devices, damping units were introduced in TMD systems, which can be supplied by magneto-rheological dampers, [18][19][20][21] particle (or impact) dampers, 22,23 eddy current dampers, [24][25][26][27][28] and friction dampers. 29,30 Moreover, pendulum TMDs were proposed to enhance the control performance of traditional TMDs by employing the nonlinearity of the pendulum mass, [31][32][33][34] and several applications in vibration control of civil structures have been reported in Roffel et al 35 , Shu et al 36 , and Sun and Jahangiri.…”

Section: Introductionmentioning

confidence: 99%

Modeling, simulation, and validation of a pendulum-pounding tuned mass damper for vibration control

Wang

Hua

Chen

et al. 2019

Struct Control Health Monit

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Summary This paper proposes a new passive control device, pendulum‐pounding tuned mass damper (PPTMD), to mitigate the response of lightly damped structures under various excitations. The proposed PPTMD consists of a tuned pendulum mass and a pounding boundary next to the equilibrium position of the pendulum mass. Moreover, a layer of viscoelastic materials called high energy‐dissipation rubber is attached on the pounding boundary to dissipate the vibration energy through impacts. A simplified impact force model was developed for modeling the pounding behavior of the high energy‐dissipation rubber pounding layer, and parameters in the simplified model were identified from free pounding experiments. The validation of the numerical method to simulate the dynamic behavior of the PPTMD was provided. The effectiveness of the PPTMD to control a single degree‐of‐freedom structure was numerically and experimentally studied under free vibration and forced vibration. The effects of the frequency tuning ratio, the coefficient of restitution, the excitation force amplitude, and the mass ratio were studied, respectively. Finally, the control performance of the PPTMD was compared with the classic tuned mass damper under free vibration, forced vibration, and several earthquake records. It is shown that the PPTMD can significantly increase the damping ratio of the controlled structure and effectively reduce the response of the controlled structure around the resonant frequency range. Furthermore, the PPTMD still achieves considerable control performance even if the frequency of the controlled structure varied in a wide range. Due to the different vibration control mechanism, the PPTMD outperforms the classic resonant frequency range in controlling the structural displacement response.

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Experimental and analytical study on vibration control effects of eddy-current tuned mass dampers under seismic excitations

Cited by 61 publications

References 27 publications

Application of an Eddy Current-Tuned Mass Damper to Vibration Mitigation of Offshore Wind Turbines

Application of an Eddy Current-Tuned Mass Damper to Vibration Mitigation of Offshore Wind Turbines

Seismic Performance of a New Type of Fabricated Tie-Column

Modeling, simulation, and validation of a pendulum-pounding tuned mass damper for vibration control

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