Results 281 to 290 of about 97,324 (334)
Performance enhancement and load reduction of a 5 MW wind turbine blade
Renewable Energy, 2014 Abstract A wind turbine rotor blade, based on the U.S. National Renewable Energy Laboratory (NREL) 5 MW reference turbine, is optimized for minimum cost of energy through simultaneous consideration of aerodynamics and bend-twist coupling. Eighty-three total design variables are considered, encompassing airfoil shapes, chord and twist distributions ...
Richard W. Vesel, Jack J. McNamara
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Volume 5: Turbo Expo 2002, Parts A and B, 2002 This paper presents a two-dimensional procedure for minimizing dynamic loading and maximizing time-averaged isentropic efficiency in multi-stage compressors. The procedure arises from the combination of an evolutionary algorithm and a CFD code in which a sliding mesh technique and a time-dependent approach are implemented enabling the study of unsteady
Ernesto Benini, Andrea Toffolo
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Passive aeroelastic study of large and flexible wind turbine blades for load reduction
Structures, 2023Wei Sun +4 more
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Controller Design for Blade Load Reduction Using Synthetic Jets
2014 American Control Conference, 2014As the size of modern wind turbines increase, the blades become longer and more flexible. Consequently, fatigue loads due to the structural vibration become more important and turn to be a constraint on enlarging the size of the new turbines. Thus, it becomes more necessary to use nontraditional actuators to damp structural vibration.
Soltani, Mohsen; id_orcid 0000-0003-0741-070X +1 more
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Nonlinear individual pitch control of large wind turbines for blade load reduction
International Conference on Renewable Power Generation (RPG 2015), 2015As wind turbines (WTs) become larger in size, they are experiencing increasing structural loads on their flexible components. This may shorten the working life of WTs or even cause damage to them. This work proposes a nonlinear individual pitch control (IPC) strategy to mitigate blade fatigue load for WTs operating in the above-rated wind speed region.
null Yang Wentao +3 more
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Wind Tunnel Results Showing Rotor Vibratory Loads Reduction Using Higher Harmonic Blade Pitch
Journal of the American Helicopter Society, 1983 C. E. Hammond
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Bladed Disk Reduction for Transient Loading Seen in Blade Tip Rubs
Volume 6: 19th International Conference on Micro- and Nanosystems (MNS); 21st International Conference on Multibody Systems, Nonlinear Dynamics, and Control (MSNDC); 37th Conference on Mechanical Vibration and Sound (VIB); 38th Fluid Power and Motion Control Symposium (FPMC)Abstract Minimizing blade tip clearance has become a main point of interest in the optimization of gas turbine engines. As such, there has been extensive work in reducing the size of the tip clearance to the point that the blades may contact the engine casing.
Noah Broski +2 more
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Load Reduction Mechanism of Cone Wall Fuse Caused by Fan Blade Off
2019 IEEE 10th International Conference on Mechanical and Aerospace Engineering (ICMAE), 2019The purpose of this paper is to study the effect of the cone wall fuse of an aeroengine caused by fan blade off. Firstly, the load reduction mechanism of cone wall fuse was analyzed. Then, the finite element model was established. Finally, the steady calculation and transient calculation was carried out.
Hou Lizhen, Liao Mingfu, Jia Runtian
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Individual Pitch Control of NREL 5MW Wind Turbine Blade for Load Reduction
Transactions of the Korean Society of Mechanical Engineers A, 2012As the size of a wind turbine increases, the rotor diameter increases. Rotor blades experience mechanical loads caused by the wind shear and the tower shadow effect. These mechanical loads reduce the life of the wind turbine. Therefore, with increasing size of the wind turbine, wind turbine control system design for the mitigation of mechanical loads ...
Yo-Han La, Yoon-Su Nam, Jae-Hoon Son
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Active load reduction by means of trailing edge flaps on a wind turbine blade
2014 American Control Conference, 2014This paper presents the blade fatigue load reduction achieved with a trailing edge flap during a full scale test on a Vestas V27 wind turbine. A frequency-weighted linear model predictive control (MPC) is tuned to decrease flapwise blade root fatigue loads at the frequencies where most of the blade damage occurs, i.e.
Ian Couchman +5 more
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