Structural vibration monitoring and operational modal analysis of offshore wind turbine structure

Dong, Xiaofeng; Lian, Jijian; Wang, Haijun; Yu, Tongshun; Zhao, Yue

doi:10.1016/j.oceaneng.2017.12.052

Cited by 126 publications

(47 citation statements)

References 31 publications

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“…In order to carry out modal property monitoring and analyse the structure's dynamic response, several accelerometers must be installed [38]. Operational modal analysis (OMA) allows modal parameters in operational conditions to be estimated based only on vibration responses, without measuring the excitation forces [41,42].…”

Section: Amentioning

confidence: 99%

Guidelines and Cost-Benefit Analysis of the Structural Health Monitoring Implementation in Offshore Wind Turbine Support Structures

Martínez-Luengo

Shafiee

2019

Energies

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This paper investigates how the implementation of Structural Health Monitoring Systems (SHMS) in the support structure (SS) of offshore wind turbines (OWT) affects capital expenditure (CAPEX) and operational expenditure (OPEX) of offshore wind farms (WF). In order to determine the added value of Structural Health Monitoring (SHM), the balance between the reduction in OPEX and the increase in CAPEX is evaluated. In this paper, guidelines for SHM implementation in offshore WF are developed and applied to a baseline scenario. The application of these guidelines consist of a review of present regulations in the United Kingdom and Germany, the development of SHM strategy, where the first stage of the Statistical Pattern Recognition (SPR) paradigm is explored, failure modes that can be monitored are identified, and SHM technologies and sensor distributions within the turbines are described for a baseline scenario. Furthermore, an inspection strategy where the different structural inspections to be carried out above and below water is also developed, together with an inspection plan for the lifetime of the structures, for the aforementioned baseline scenario. Once the guidelines have been followed and the SHM and inspection strategies developed, a cost-benefit analysis is performed on the baseline case (10% instrumented assets) and three other scenarios with 20%, 30% and 50% of instrumented assets. Finally, a sensitivity analysis is conducted to evaluate the effects of SHM hardware cost and the time spent in completing the inspections on OPEX and CAPEX of the WF. The results show that SHM hardware cost increases CAPEX significantly, however this increase is much lower than the reduction in OPEX caused by SHM. The results also show that an increase in the percentage of instrumented assets will reduce OPEX and this reduction is considerably higher than the cost of SHM implementation.

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Section: Amentioning

confidence: 99%

Guidelines and Cost-Benefit Analysis of the Structural Health Monitoring Implementation in Offshore Wind Turbine Support Structures

Martínez-Luengo

Shafiee

2019

Energies

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“…Oliveira et al reported the long-term behavior of a wind turbine by analyzing the variation of the frequency values estimated by both the p-LSCF and SSI-COV methods based on the monitoring data recorded over one year [14]. Dong and Lian et al [15] and Zhao and Wang et al [16] also applied OMA algorithms to different wind turbines in order to analyze their structural behavior under operational conditions. In [12][13][14][15][16], a harmonic frequency of 3nf due to the loading impulses from blade passages was also observed.…”

Section: Introductionmentioning

confidence: 99%

“…Dong and Lian et al [15] and Zhao and Wang et al [16] also applied OMA algorithms to different wind turbines in order to analyze their structural behavior under operational conditions. In [12][13][14][15][16], a harmonic frequency of 3nf due to the loading impulses from blade passages was also observed. In summary, most studies have applied OMA algorithms [15,16] to acceleration, velocity, or the displacement response, allowing the 3f excitation frequency to be successfully identified.…”

Section: Introductionmentioning

confidence: 99%

Resonance Monitoring of a Horizontal Wind Turbine by Strain-Based Automated Operational Modal Analysis

Tang

Wang

et al. 2020

Energies

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A strain-based automated operational modal analysis algorithm is proposed to track the long-term dynamic behavior of a horizontal wind turbine under operational conditions. This algorithm is firstly validated by a scaled wind turbine model, and then it is applied to the dynamic strain responses recorded from a 5 MW wind turbine system. We observed variations in the fundamental frequency and 1f, 3f excitation frequencies due to the mass imbalance of the blades and aerodynamic excitation by the tower dam or tower wake. Inspection of the Campbell diagram revealed that the adverse resonance phenomenon and Sommerfeld effect causing excessive vibrations of the wind tower.

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“…Currently, bucket foundation has been put forward as an innovative foundation type which is applicable to softer soil conditions due to its cost-effectiveness and high-reliability [1,2] compared with the other various foundation types [3][4][5], including monopile [6,7], concrete pile-supported square footing [8], gravity, tripod [9], jacket [9,10], and floating [11], which were designed for different environmental and geological conditions. The bucket foundation normally consists of skirt and lid, which constitutes an upside-down bucket [12] and may be used as an offshore wind turbine foundation in appropriate soil conditions [13,14]. The most outstanding advantages of this foundation type are high lateral and moment resistance, which are provided by the extended cylindrical skirt and compartments [15].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Impedance of the Wide-Shallow Bucket Foundation for Offshore Wind Turbine Using Coupled Finite–Infinite Element Method

et al. 2019

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The dynamic impedances of foundation play an important role in the dynamic behavior and structural stability of offshore wind turbines (OWT). Though the behaviors of bucket foundation, which are considered as a relatively innovative foundation type under static loading, have been extensively investigated, the corresponding dynamic performances were neglected in previous research. This study focuses on the dynamic impedances of wide-shallow bucket foundations (WSBF) under the horizontal and rocking loads. Firstly, the numerical model was established to obtain the dynamic impedances of WSBF using the coupled finite-infinite element technique (FE-IFE). The crucial parameters affecting the dynamic responses of WSBF are investigated. It is shown that the skirt length mainly affects the rocking dynamic impedance and the diameter significantly affects the horizontal and coupling impedances, especially when the diameter is larger than 34 m. The overall dynamic responses of WSBF are profoundly affected by the relative soil thickness and the multi-layer soil stiffness. Additionally, dynamic impedances of WSBF are insensitive to the homogeneous soil stiffness. Lastly, the safety threshold curve was calculated according to the OWT, which can provide essential reference for the design of the OWT supported by large scale WSBF.

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Structural vibration monitoring and operational modal analysis of offshore wind turbine structure

Cited by 126 publications

References 31 publications

Guidelines and Cost-Benefit Analysis of the Structural Health Monitoring Implementation in Offshore Wind Turbine Support Structures

Guidelines and Cost-Benefit Analysis of the Structural Health Monitoring Implementation in Offshore Wind Turbine Support Structures

Resonance Monitoring of a Horizontal Wind Turbine by Strain-Based Automated Operational Modal Analysis

Dynamic Impedance of the Wide-Shallow Bucket Foundation for Offshore Wind Turbine Using Coupled Finite–Infinite Element Method

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