Active control of the edgewise vibrations in wind turbine blade by optimization of the number and locations of the intermediate actuators

, Article International Journal of Dynamics and Control ; Volume 11, Issue 3 , 2023 , Pages 1230-1246 ; 2195268X (ISSN) Pishbahar, B ; Moradi, H ; Sharif University of Technology

Springer Science and Business Media Deutschland GmbH 2023

Abstract

Vibrations in the horizontal axis wind turbine reduce their efficiency and increase the maintenance costs. In this paper, the blade edgewise vibrations are reduced by using several actuators in different parts of the wind turbine blade and optimization of the number and locations of the actuators. Dynamic behaviour of the wind turbine blade is investigated by using the dynamic modelling. The blade element momentum is used to calculate the aerodynamic forces acting on the blades. The actuators are trusses that are located inside each blade and apply the control force to different parts of the blade. Active control force is applied to reduce the edgewise vibrations. The designed controller is...

Active Control of Edgewise Vibrations in Wind Turbine Blade by Optimization of the Number and Locations of the Intermediate Actuators

, M.Sc. Thesis Sharif University of Technology Pishbahar, Baher (Author) ; Moradi, Hamed (Supervisor)

Abstract

Vibrations in HAWT reduce their efficiency and increase maintenance costs. In this paper, the blade edgewise vibrations are reduced by using several actuators in different parts of the wind turbine blade and optimization of the number and locations of actuators. The wind turbine blade dynamic behavior is investigated by using dynamic modeling. The actuators are trusses that are located inside each blade and apply control force to different parts of the blade. Active control force is applied to reduce edgewise vibrations. The designed controller is applied and simulated on NREL 5MW wind turbine. By applying the controller, the edgewise vibrations of wind turbine blades are significantly...

Assessing coalition in meeting environmental flow based on Shapley value and nash equilibrium: case study Aras River

, Article International Journal of Environmental Science and Technology ; Volume 19, Issue 7 , 2022 , Pages 6521-6530 ; 17351472 (ISSN) Rashidi, M ; Zarghami, M ; Pishbahar, E ; Fallahi, F ; Sharif University of Technology

Springer Science and Business Media Deutschland GmbH 2022

Abstract

Water allocation is a process of identifying the stakeholders, assessing the amount of water they need, and estimating the volume of renewable water resources. This study investigates the coalition possibilities among the riparian in the Aras River as a transboundary basin over-allocating the environmental flow share. To this end, first, the environmental flow is estimated downstream of the basin based on the annual potential runoff. Then, to estimate the agricultural production function in each country, the relationship between the agriculture value-added and the variables like annual potential runoff and capital in the agricultural sector is derived using the seemingly unrelated regression...