Contribution of tuned liquid column gas dampers to the performance of offshore wind turbines under wind, wave, and seismic excitations

Bargi, Khosrow; Dezvareh, Reza; Mousavi, Seyed Amin

doi:10.1007/s11803-016-0343-z

Cited by 20 publications

(6 citation statements)

References 13 publications

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“…Also, the Power Law wind profile is used here for mean wind speed. Moreover, aerodynamic power is sensitive to blade pitch angle [23][24][25]. Once the wind speed exceeds the optimal 5MW turbine's speed, which is 11.4 m /s, the initial pitch angle of the blades (0°) will increase by the pitch controller relative to the corresponding wind speed.…”

Section: Dynamic Response Analysismentioning

confidence: 99%

Pile Apparent Fixity Length Estimation for the Jacket-type Offshore Wind Turbines under Lateral Loads Applicable to Fatigue Analysis

Shahmohammadi

Shabakhty

2020

ijcoe

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Section: Dynamic Response Analysismentioning

confidence: 99%

Pile Apparent Fixity Length Estimation for the Jacket-type Offshore Wind Turbines under Lateral Loads Applicable to Fatigue Analysis

Shahmohammadi

Shabakhty

2020

ijcoe

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“…The tuned liquid column damper (TLCD) has features like compatibility with the surrounding environment and easy maintenance requirements and costs that make it an appropriate choice for offshore structures. Colwell and Basu (2009), Dezvareh et al (2015), Bargi et al (2016), and Hemmati et al (2019) proved that the TLCD is capable of suppressing the response of fixed offshore wind turbines to wind and wave loadings. TLCDs were also found to greatly increase the fatigue life of structural elements.…”

Section: Introductionmentioning

confidence: 96%

Enhancement the Fatigue Life of Floating Breakwater Mooring System Using Tuned Liquid Column Damper

Shahrabi

Bargi

2019

Lat. Am. j. solids struct.

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Safety is a key design criterion for floating structures. A high rate of mooring accidents has been reported over the past decades. Preventing mooring line failure is a key design objective for floating breakwater systems. The mooring system comprises sets of mooring lines anchored to the seabed. These components are exposed to highly cyclic nonlinear load fluctuations induced by an irregular wave climate during their service life. DNVGL-OS-E301 classifies the mooring lines for floating breakwaters as long-term elements that should be evaluated according to the fatigue limit state. Fatigue of mooring lines needs to be monitored and evaluated to warrant the station keeping and integrity of overall system. Applying an additional control device to a floating breakwater mitigates the structural response and hence mobilized tension in mooring system. The focus of present study was to examine the effect of an additional control device on fatigue life of mooring lines for floating breakwaters. To evaluate the effect of a control device on the fatigue behavior of mooring lines, a floating breakwater was simulated with a tuned liquid column damper (TLCD) attached. A time-dependent approach based on S-N curves in conjunction with the Palmgren-Miner rule was employed to evaluate the mooring line fatigue. This paper presents a further parametric study focused on the effect of TLCD on fairlead point displacement, mobilized tension, damage rate, and fatigue life of mooring lines. The results showed that TLCD increased the fatigue life of mooring line and thus dramatically decreased the likelihood of the mooring system being damaged by fatigue. This would reduce the maintenance costs and increase the lifetime and operational safety of floating breakwater. In addition, the presented case study showed that failure probability of mooring lines against fatigue damage was also reduced and was acceptable for the safety factor defined in DNVGL-OS-E301. This proposed approach of applying a TLCD is a practical tool for designing the components of a floating breakwater more efficiently. Keywords floating breakwater (FB); tuned liquid column damper (TLCD); fatigue assessment; mooring system; S-N curves; structural control Enhancement the Fatigue Life of Floating Breakwater Mooring System Using Tuned Liquid Column Damper Mostafa Shahrabi et al.

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“…Among various kinds of structural control devices, TLCD may be favorable for application in the offshore structures because of compatibility with surrounding environment, high performance, and cost efficiency. Colwell and Basu (2009), Dezvareh et al (2015), and Bargi et al (2016) studied the TLCD effects on the behavior of fixed offshore wind turbines. The results completely indicated that when an offshore wind turbine equipped with a TLCD, reduction of peak response of the same system without TLCD may be achieved.…”

Section: Introductionmentioning

confidence: 99%

Structural control of the floating breakwaters by implementation of tuned liquid column damper

Shahrabi

Bargi

2020

Advances in Structural Engineering

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The growing maritime activities have led offshore engineers to the application of floating breakwaters to protect coastlines from erosion and to provide a layer of support to ports in the case of strong wave actions. In these applications, minimizing the floating part responses to wave-induced excitations as one of the most critical operational characteristics would be a key factor. In this article, the structural responses of the floating breakwaters are studied through modeling and simulation. To mitigate the floating part wave-induced vibrations, an attached tuned liquid column damper is integrated into the simulation. In the first stage, the numerical model of the floating breakwater system containing the floating body and the mooring system is created. Then, by proposing an iterative coupling procedure, the joint tuned liquid column damper-floating breakwater model is developed. Several rigorous study cases are defined to evaluate the effect of tuned liquid column damper on controlling the floating body unwanted vibrations. In this application, the Airy wave theory and the Joint North Sea Wave Observation Project wave spectrum are used for wave excitations. In order to evaluate the effect of tuned liquid column damper on floating breakwaters, some design parameters like floating body motions and mooring system-mobilized tensile stresses are evaluated. The simulations are conducted in both the time domain and the frequency domain for cases with and without tuned liquid column damper. The rain flow counting method is applied to perform the mooring system fatigue analysis. The study results clearly proved that implementation of tuned liquid column damper would mitigate the floating body responses compared to the original floating breakwater system. In addition, it is indicated that the fatigue-induced failure risks in tuned liquid column damper-floating breakwater mooring system is decreased that would reduce the procurement costs and increase the operational safety of the floating breakwater system.

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Contribution of tuned liquid column gas dampers to the performance of offshore wind turbines under wind, wave, and seismic excitations

Cited by 20 publications

References 13 publications

Pile Apparent Fixity Length Estimation for the Jacket-type Offshore Wind Turbines under Lateral Loads Applicable to Fatigue Analysis

Pile Apparent Fixity Length Estimation for the Jacket-type Offshore Wind Turbines under Lateral Loads Applicable to Fatigue Analysis

Enhancement the Fatigue Life of Floating Breakwater Mooring System Using Tuned Liquid Column Damper

Structural control of the floating breakwaters by implementation of tuned liquid column damper

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