Shaking table test on seismic responses of a wind turbine tower subjected to pulse-type near-field ground motions

Ren, Qianqian; Yu, Xu; Zhang, Hui; Lin, Xinhao; Huang, Wei; Yu, Junqi

doi:10.1016/j.soildyn.2020.106557

Cited by 23 publications

(5 citation statements)

References 30 publications

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“…The first model is the 1:20 scaled model OWT without counterweight, which is used in this study; the second model is the 1:20 scaled model OWT with counterweight, which accounts for gravity similarity; the third model is the prototype OWT. Since the dimensions of gravitational acceleration and structural acceleration are identical, 28 achieving gravity similarity is equivalent to the acceleration scaling factor of 1:1. The scaling factors derived according to Buckingham's π ‐theorem 52 are listed in Table 2, and the seismic wave is modified according to the similarity theory.…”

Section: Model Design and Test Setupmentioning

confidence: 99%

“…Based on the existing simplified theories, the hydrodynamic effects during earthquakes may not be well simulated. Despite the prosperous development of shaking table testing of prototype [21][22][23] and model [24][25][26][27][28] wind turbines, studies on the OWTs' seismic performance and hydrodynamic effects are relatively scarce due to the limitations of underwater shaking table technology. Ding et al 29 captured the added mass effect of a bridge pier by underwater shaking table tests; however, the rigid pier had little reference for flexible OWTs.…”

Section: Introductionmentioning

confidence: 99%

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Seismic responses and vibration control of offshore wind turbines considering hydrodynamic effects based on underwater shaking table tests

He,

Pan

2023

Earthq Engng Struct Dyn

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The recent construction of numerous offshore wind turbines (OWTs) in seismically active areas worldwide has stimulated research on seismic evaluation and vibration control design for OWTs. Unlike the onshore counterparts, the hydrodynamic effects on the seismic responses of OWTs need to be studied. Besides, the equipment in the nacelle of an OWT is highly sensitive to acceleration. Significant dynamic amplification on the nacelle under horizontal earthquake excitation can cause the malfunction of power generation and even seriously threaten the safety of OWTs. As a promising solution, tuned mass dampers (TMDs) based on the first mode of OWTs need to be tested by various earthquake excitations. In this paper, the seismic amplification effect, the hydrodynamic effects, and the vibration control by a single TMD are investigated through a series of underwater shaking table tests based on a 1:20 scaled model of a 5 MW OWT. The “no water”, “with water”, and “with water and TMD” tests are evaluated and compared. The accelerations of OWTs can be amplified or reduced by the hydrodynamic effects, depending on the natural frequencies and vibration modes of the OWT and the frequency spectrum of the seismic excitation. The earthquake‐induced hydrodynamic damping ratio and hydrodynamic added mass are carefully measured. For the TMD's effect, the single TMD performs reasonably well in seismic vibration control in most cases. Finally, the interaction between hydrodynamic effects and TMD's effect is discussed, and the hydrodynamic damping effect is suggested to be ignored when designing TMDs for OWTs.

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Section: Model Design and Test Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic responses and vibration control of offshore wind turbines considering hydrodynamic effects based on underwater shaking table tests

He,

Pan

2023

Earthq Engng Struct Dyn

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“…Consequently, the generated equivalent acceleration using Equation (27) will be centralized; that is, the mean will be removed, and thus, the mean of the final equivalent acceleration is zero. 9,18,32,33 Since the wind flow usually comes from on direction, so the equivalent excitation is exerted in the X-direction or Ydirection as shown in Figure 9. According to Equation (26) and principle of frequency similarity of scale model, the similarity ratio of frequency between equivalent acceleration and wind loads can be obtained as 5.…”

Section: Load Cases and Sensor Layoutmentioning

confidence: 99%

“…However, the average component usually do not trigger vibration of the WTT; thus, only the fluctuating component is involved in this test. Consequently, the generated equivalent acceleration using Equation (27) will be centralized; that is, the mean will be removed, and thus, the mean of the final equivalent acceleration is zero 9,18,32,33 …”

Section: Shaking Table Testmentioning

confidence: 99%

Investigation and optimization of a pre‐stressed tuned mass damper for wind turbine tower

Liu

Lei

Wang

2021

Structural Contr & Hlth

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Summary With the development of megawatts wind turbines, excessive vibrations of the flexible and slender wind turbine tower under wind excitation have become increasingly prominent. To enhance implement ability of the passive control device for the tower, a new type of passive pre‐stressed tuned mass damper (PS‐TMD) is proposed in this study. A simplified mechanical calculation model of the tower with the PS‐TMD device is established, and the dynamic coefficient and vibration reduction mechanism are deduced through theoretical analysis. And then the design procedure including the optimal pre‐stress and damping coefficient for the proposed device is presented. The numerical simulation example shows that the tuning effect of PS‐TMD is better than the traditional tuned mass damper under the same conditions. The results from a shaking table test demonstrate that acceleration and dynamic displacement response are reduced about 20% and 30%, respectively.

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“…Similar conclusions were drawn by Sigurðsson et al (2020) in their analysis of the effect of pulse-like near-fault ground motions on an 87.6-meter-tall steel wind turbine and by Xu et al (2021) in their collapse analysis of a 65-meter-tall steel wind turbine subjected to ten pulse-like near-fault and ten non-pulse near-fault ground motions. Ren et al (2021) carried out a shaking table test of a 1/20-scaled steel wind turbine excited by two near-fault and two far-field ground motions, showing that the seismic response caused by near-fault ground motions was significantly larger than that caused by far-field ground motions.…”

Section: Introductionmentioning

confidence: 99%

Reliability assessment for hybrid solar tower under near-fault pulse-like ground motions using Kriging surrogate and subset simulation

Ding

Bai

2023

Journal of Vibration and Control

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Concentrated solar towers are commonly designed as high-rise hybrid structures, which exhibit properties of non-uniform mass and rigidity along the height of the tower, and consequently are vulnerable to strong seismic ground motions. This study presents a comprehensive analysis of the seismic performance of a hybrid solar tower, which is one of the tallest hybrid solar towers in the world. The hybrid solar tower includes a reinforced concrete tube at the bottom and a steel-truss tube at the top and is subjected to near-fault pulse-like ground motions. A simulation technique that utilizes the stochastic point-source model and a velocity pulse model was introduced to generate stochastic pulse-like ground motions. The stochastic response of the hybrid solar tower to near-fault pulse-like ground motions was computed to estimate the tower’s reliability. To enhance the efficiency of reliability estimation, an algorithm combining the Kriging surrogate and subset simulation (K-SS) was presented. The aggregate response of the tower was found to be significantly more damaging over the border of the reinforced concrete tube and the steel-truss tube than below the border. The study found that the hybrid solar tower has a reliability of 90.53% when subjected to stochastic near-fault pulse-like ground motions with a peak ground acceleration of 0.62 g. The findings of this study contribute to the understanding of the seismic performance of high-rise hybrid solar towers under near-fault pulse-like ground motions.

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Shaking table test on seismic responses of a wind turbine tower subjected to pulse-type near-field ground motions

Cited by 23 publications

References 30 publications

Seismic responses and vibration control of offshore wind turbines considering hydrodynamic effects based on underwater shaking table tests

Seismic responses and vibration control of offshore wind turbines considering hydrodynamic effects based on underwater shaking table tests

Investigation and optimization of a pre‐stressed tuned mass damper for wind turbine tower

Reliability assessment for hybrid solar tower under near-fault pulse-like ground motions using Kriging surrogate and subset simulation

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