TMD stroke limiting influence on barge-type floating wind turbines

Villoslada, D.; Santos, Matilde; Tomás-Rodrı́guez, M.

doi:10.1016/j.oceaneng.2022.110781

Cited by 21 publications

(7 citation statements)

References 35 publications

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“…5, the spectral density peak frequencies show no difference with the varying significant wave heights. Therefore, only the results of a significant wave height of 4.73 m are presented (cases [7][8][9][10][11][12][13][14][15][16][17][18]. The comparison of the spectral density of pitch motion under different significant wave heights is shown in the following.…”

Section: G Frequency-domain Resultsmentioning

confidence: 99%

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Hydrodynamic studies of a 15 MW semi-submersible FOWT to assess the suitability of the inclusion of a damper system

Gao,

Zhao,

Johanning

et al. 2023

Proc. EWTEC

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Floating Offshore Wind Turbines (FOWT) can exploit the high energy density found in the offshore environment, with turbines now reaching up to 15 MW in size. At the same time, however, the energetic environment and the massive size of the device present significant challenges in the motion stabilization and mooring system. To overcome these challenges, a tuned mass damper (TMD) has been considered for integration in the FOWT for peak motion reduction. This paper investigates the baseline responses including motion, dynamic response, and tensile loading of the mooring line for a 15MW FOWT on a semi-submersible platform without TMD to identify the damageable motion and the impacts of the TMD on the motion response under wave-wind environmental loadings. The comprehensive analysis is conducted in a package for the dynamic analysis of offshore marine systems, named as Orcaflex. The dynamic and motion characteristics of the 15MW FOWT are analysed and compared under different environmental parameters. The wave and wind parameters are quantified by the 20-years statistical data of the Celtic Sea including both operational and extreme conditions (with a 50-year return period). Subsequently, the key parameters of TMD are investigated by configuring different combinations of mass, damping coefficients and stiffnesses. The preliminary results of the study show that the TMD system can successfully mitigate extreme motion characteristics, however this is strongly dependent on damping properties. Unsuitable TMD designs may increase the motion responses of FOWT and the tensile loading on the mooring line. Therefore, the TMD properties have to be adjusted based onsite environmental conditions). With this consideration, an active TMD with changeable damping properties will be conducted in future research.

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Section: G Frequency-domain Resultsmentioning

confidence: 99%

“…The results demonstrated that the TMDs are more efficient in operating conditions. Active dampers are effective in reducing structural loads and vibrations but at the expense of active power and large stroke [16]. Brodersen et al [17] employed an active tuned mass damper (ATMD) for fixed OWTs to investigate its effect on tower vibrations.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic studies of a 15 MW semi-submersible FOWT to assess the suitability of the inclusion of a damper system

Gao,

Zhao,

Johanning

et al. 2023

Proc. EWTEC

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“…For this particular case, the single damper system may be effective and economical in motion reduction. Notably, the normal wave period range is from 5 s to 20 s. As for the single damper system, the natural frequency of the device is tuned to the natural frequency of the structural motion to maximize energy absorption, which is the most important aspect of designing the damper system [16]. Meanwhile, the results also indicate that the second peak could be close to or larger than the first peak.…”

Section: Discussionmentioning

confidence: 99%

“…Active dampers are effective in reducing structural loads and vibrations, but at the expense of active power and large stroke [16]. Brodersen et al [17] employed an active tuned mass damper (ATMD) for fixed OWTs to investigate its effect on tower vibrations.…”

Section: Introductionmentioning

confidence: 99%

Aero-Hydrodynamic Studies of a 15 MW Semi-Submersible FOWT to Assess the Suitability of the Inclusion of a Damper System

Gao,

Zhao,

Johanning

et al. 2023

ASME 2023 5th International Offshore Wind Technical Conference

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Floating offshore wind turbines can exploit the high energy density experienced in offshore environments, with turbines now reaching up to 15 MW in size. However, given the larger size of these turbines and the severe offshore environment, there remains significant challenges in motion stabilization. To overcome these challenges, the inclusion of a damper system could be considered to reduce motions. This paper conducts a numerical dynamic analysis of a 15 MW semi-submersible floating offshore wind turbine under a range of environmental conditions, informing the design criteria for such a damper system. The study presents the findings under different environmental loading conditions. In the first instance, the time-domain results of hydrodynamic study were used to determine the dominant characteristics. The initial study identified the pitch motion of main concern. The simulations were carried out under wave-only and wind-wave loading. In the wave-only conditions study, excitation modes were observed at both the eigenfrequency and excitation frequency, dependent on wave conditions. When the wind loads were introduced, a large mean pitch offset and amplitude relative to the mean offset were observed. Within the discussion, a dual damper system is suggested to increase the stability of the platform.

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“…Te numerical simulations show that the TMD designed with the proposed method, achieving a limited TMD stroke, has similar control efectiveness in comparison to Den Hartog's solution [16]. Villoslada et al [17] studied the optimization method of TMD parameters for vibration reduction of a foating ofshore wind turbine by considering the conditions of mass and stroke limitations in TMD application. Pourzangbar and Vaezi [18] investigated the efects of pendulum-tuned mass damper confguration as well as structural excitation frequency by ocean waves on the dynamic response of a jacket platform.…”

Section: Introductionmentioning

confidence: 99%

A Double-Tuned Pendulum Mass Damper Employing a Pounding Damping Mechanism for Vibration Control of High-Rise Structures

Wang

Yang

et al. 2023

Structural Control and Health Monitoring

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Recently, enhancing conventional tuned mass dampers (TMDs) with a pounding damping mechanism is demonstrated to be an efficient way for vibration control of flexible structures. In this paper, a double-tuned pendulum mass damper employing a pounding damping mechanism (DTPMD-PD) is proposed. DTPMD-PD dissipates energy through the collision between distributed balls with a smaller mass and viscoelastic (VE) boundary, which can effectively reduce noise during operation compared to conventional impact dampers. Moreover, DTPMD-PD utilizes a double-tuning mechanism, and its control performance is significantly enhanced. The motion equations of a multiple degree of freedom (MDOF) structure equipped with DTPMD-PD are formulated. Based on the H∞ optimization criterion, a numerical optimization is performed to obtain the optimal design parameters of DTPMD-PD. Additionally, the pounding dissipation capacity and the parametric identification of the impact force model are investigated through free pounding experiments, and the control performance and robustness of DTPMD-PD are experimentally studied in the laboratory. The results show that the proposed numerical modeling method has considerable accuracy through experimental verifications. The restitution coefficient of the pounding layer has a significant influence on the performance of proposed DTPMD-PD. Optimized DTPMD-PD has better effectiveness than conventional TMDs under harmonic and seismic loads.

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TMD stroke limiting influence on barge-type floating wind turbines

Cited by 21 publications

References 35 publications

Hydrodynamic studies of a 15 MW semi-submersible FOWT to assess the suitability of the inclusion of a damper system

Hydrodynamic studies of a 15 MW semi-submersible FOWT to assess the suitability of the inclusion of a damper system

Aero-Hydrodynamic Studies of a 15 MW Semi-Submersible FOWT to Assess the Suitability of the Inclusion of a Damper System

A Double-Tuned Pendulum Mass Damper Employing a Pounding Damping Mechanism for Vibration Control of High-Rise Structures

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