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A platform for research: civil engineering, architecture and urbanism
Defects, Damage, and Repairs Subject to High-Cycle Fatigue: Examples from Wind Farm Tower Design
Wind farm towers are the steel lattice or tube towers serving as the support structures for large power-generating wind turbines. This paper presents a variety of wind farm tower problems encountered over two decades of practice in the wind energy industry. Wind towers are subject to turbine operational loads that cause very high-cycle fatigue loading and can give rise to unusual tower problems requiring special repairs. Problems unique to wind towers include: structural damage or collapse from turbine overspeed ("runaway" condition); tower resonance with turbine operational frequencies; turbine fires; and excessive localized member vibrations. Further, wind towers can suffer from construction-related problems: fabrication and weld defects; design deviations; accidental dents and gouges during transport; construction errors during tower erection; and wind-induced vortex shedding oscillations. Each tower problem is discussed in terms of its cause, evaluation method, mitigation strategies, and repair options with special consideration for high-cycle fatigue.
Defects, Damage, and Repairs Subject to High-Cycle Fatigue: Examples from Wind Farm Tower Design
Wind farm towers are the steel lattice or tube towers serving as the support structures for large power-generating wind turbines. This paper presents a variety of wind farm tower problems encountered over two decades of practice in the wind energy industry. Wind towers are subject to turbine operational loads that cause very high-cycle fatigue loading and can give rise to unusual tower problems requiring special repairs. Problems unique to wind towers include: structural damage or collapse from turbine overspeed ("runaway" condition); tower resonance with turbine operational frequencies; turbine fires; and excessive localized member vibrations. Further, wind towers can suffer from construction-related problems: fabrication and weld defects; design deviations; accidental dents and gouges during transport; construction errors during tower erection; and wind-induced vortex shedding oscillations. Each tower problem is discussed in terms of its cause, evaluation method, mitigation strategies, and repair options with special consideration for high-cycle fatigue.
Defects, Damage, and Repairs Subject to High-Cycle Fatigue: Examples from Wind Farm Tower Design
Agbayani, Nestor A. (author)
Fifth Forensic Engineering Congress ; 2009 ; Washington, D.C., United States
Forensic Engineering 2009 ; 546-555
2009-11-02
Conference paper
Electronic Resource
English
Defects, Damage, and Repairs Subject to High-Cycle Fatigue: Examples from Wind Farm Tower Design
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