بررسی اثر اندرکنش خاک - سازه در تشخیص خرابی برج توربین بادی توسط موجک‌های دو متعامد

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران.

2 گروه عمران، دانشکده فنی، دانشگاه گیلان، رشت، ایران

3 عضو هیات علمی/ پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله

چکیده

باد از منابع پاک انرژی است. تمایل به استفاده از توربین‌های بادی در دهه‌های اخیر در دنیا روندی رو به رشد داشته است. اندازه و ظرفیت توربین‌های بادی به‌ منظور کسب بیشتر انرژی باد، به ‌سرعت در حال افزایش می‌باشد. آمار نشان می‌دهد توربین‌های بزرگ‌تر، بیشتر خراب شده و نیازمند نگهداری بیشتری هستند. هدف صاحبان مزارع بادی، هماهنگی و نظارت بر کار به‌ منظور کاهش زمان از کار افتادگی و افزایش بهره‌وری توربین‌های مزرعه بادی می‌باشد. برج توربین بادی، کل توربین بادی را حمل کرده و دارای مقام دوم هزینه توربین بادی است. با اینکه خرابی برج می‌تواند کل توربین بادی را به خطر انداخته و سبب خرابی وسیع گردد ولیکن تحقیقات این بخش از توربین نسبت به تأسیسات مکانیکال توربین بادی، ناچیز است. به علاوه تحقیق جامعی نیز در پایش سلامت برج با اندرکنش خاک - سازه انجام نشده است. در این تحقیق از موجک‌های دو متعامد به‌ منظور پردازش شکل مودی برج آسیب‌دیده استفاده گردید. توربین بادی ساحلی 5 مگاواتی آزمایشگاه ملی انرژی تجدید پذیر وزارت نیرو آمریکا، در نرم‌افزار المان محدود آباکیوس مدل گردید و صحت‌سنجی شد. پی سطحی به ابعاد 1×20×20 مترمکعب و خاک‌ها از نوع رس عادی تحکیم یافته و ماسه متراکم، در نظر گرفته شد. تعداد هجده سناریوی خرابی، تعریف گردید. نتایج تحقیق بیانگر این است که به ‌منظور تشخیص خرابی استفاده از شکل‌های مودی پهلو - پهلو برج، دارای برتری محسوسی نسبت به شکل‌های مودی جلو - عقب هستند. نظر به تأثیرگذاری مطلوب تأثیر اندرکنش خاک - سازه بر روی دقت تشخیص خرابی، لزوم در نظر گرفتن این اثر در تحلیل‌ها، تأکید می‌گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Soil-Structure Interaction Effects on Damage Detection of Wind Turbine Tower with Biorthogonal Wavelets

نویسندگان [English]

  • Mohsen Mehr Motlagh 1
  • Arash Bahar 2
  • omid bahar 3
1 Department of Civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran.
2 Civil Engineering Group, Faculty of Engineering, University of Guilan, Rasht, Iran
3 Faculty/International Institute of Earthquake Engineering & Seismology (IIEES)
چکیده [English]

The wind has been one of the cleanest sources of energy. The tendency to use wind turbines has been a growing trend in the world in recent decades. The size and capacity of wind turbines are increasing rapidly in order to obtain more wind energy. Statistics show that more giant turbines are more broken down and require more maintenance. Wind farm owners' goal is to monitor work to reduce downtime and increase the efficiency of each wind turbine. The wind turbine tower carries the entire wind turbine and is the second-largest cost of the wind turbine. Damage to the tower can endanger the entire wind turbine and cause extensive damage. However, the background to the study of the wind turbine tower’s health monitoring against its mechanical installations is insignificant. Besides, no comprehensive research has been conducted on the tower’s health monitoring with soil-structure interaction included. In this study, biorthogonal wavelets were used to process the mode shape of the damaged tower. The foundation is a square concrete foundation 20 m × 20 m and 1 m in depth. Two different soils, normally consolidated clay and dense sand, are considered. Eighteen failure scenarios were defined. This study indicates that the use of side-to-side mode shapes of the tower has a tangible advantage over its fore-aft mode shapes for detecting failure. Considering the desirable effect of soil-structure interaction on damage detection, it is necessary to examine this analysis’s effect.

کلیدواژه‌ها [English]

  • Wind turbine tower
  • damage detection
  • Soil-structure interaction
  • multilevel 2D wavelet decomposition
  • biorthogonal wavelets
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