کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5473156 1520235 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Natural frequency of offshore wind turbines on rigid and flexible monopiles in cohesionless soils with linear stiffness distribution
ترجمه فارسی عنوان
پارامترهای طبیعی توربین های دریایی در دریای خزر بر روی یکپارچه های سفت و سخت و انعطاف پذیر در خاک های بدون انبساط با توزیع سختی خطی
کلمات کلیدی
فرکانس طبیعی، یکپارچه، واکنش زیر بغل، نسبت شفافیت، روش ریلی،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
چکیده انگلیسی
A simplified method is introduced to obtain the fundamental frequency of offshore wind turbines supported by monopile foundations. Soil-pile interaction is modeled based on Winkler approach and concept of beam on elastic foundation. The soil is considered to have linearly varying modulus of subgrade reaction along depth which is a typical assumption for cohesionless soils. Rayleigh method which is based on conservation of total energy of the system is utilized. Firstly the natural frequency of the system with rigid pile is derived and then an innovative procedure is introduced to take pile flexural stiffness into consideration. Comparison between results of the present method with those of a numerical FE model for a typical 2 MW wind turbine structure shows excellent agreement for rigid pile and flexible pile with small value of slenderness ratio. The agreement is also good for flexible pile with higher slenderness ratios. A parametric study is carried out to investigate the effect of important parameters of foundation including pile slenderness ratio, pile aspect ratio and pile mass on the system natural frequency.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Ocean Research - Volume 68, October 2017, Pages 91-102
نویسندگان
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