بررسي فركانس هاي طبيعي و آناليز حساسيت پارامترهاي مجموعه توربين بادي با محور افقي

Natural Frequency Study and parametric Sensitivity Analysis of Axial wind turbine

در اين مقاله، مدلسازي و تحليل ارتعاشاتي مجموعه توربين بادي شامل پره‌ها و برج به طور همزمان مورد بررسي قرار مي‌گيرد. در مدلسازي پره ها سرعت دوراني آنها نيز در نظر گرفته مي شود. ابتدا معادلات توربين بادي در حالت كلي توسط روش معادلات لاگرانژ استخراج و سپس معادلات به روش عددي حل مي‌شود. در حل عددي، فركانسهاي طبيعي توربين بادي 5/2 مگاواتي ثامن با استفاده از مشخصات فني آن استخراج مي‌شود. در انتها ميزان حساسيت فركانس هاي طبيعي اجزاي توربين بادي نسبت به پارامترهاي اصلي سيستم مانند طول پره، طول برج و جرم مجموعه هاب و ناسل بررسي مي‌شود

In this research, modeling and vibrations analysis of the wind turbine blades and tower is studied. Modeling of each wind turbine blade is considered to be as elastic beam with rotational speed, and wind turbine tower is modeled as an Euler-Bernoulli elastic beam. Vibrations of blades and tower is considered in plane of rotation of blades. The equations of motion of the wind turbine are derived by Lagrangian approach and then numerically are solved. For the numerical solution, a limited number of elements are considered for the blades and the tower and then the natural frequencies of 2.5 MW SAMEN wind turbines is investigated by using its technical specifications. The effect of varying the length of the tower and the total mass of hub and nacelle on the natural frequencies is investigated, and the effect of varying the length of the blade on the natural frequencies of the blade is also investigated. Finally, the sensitivity analysis of the wind turbine natural frequencies with respect to different system parameters are presented.