Results 81 to 90 of about 383,309 (303)

Combined Pitch and Trailing Edge Flap Control for Load Mitigation of Wind Turbines

Energies, 2018
Using active control methods for load mitigation in wind turbines could greatly reduce the cost of per kilowatt hour of wind power. In this work, the combined pitch and trailing edge flap control (CPFC) for load mitigation of wind turbines is ...
Keshan He, Liangwen Qi, Liming Zheng, Yan Chen   +3 more
doaj   +1 more source

State-space model identification and feedback control of unsteady aerodynamic forces

, 2014
Unsteady aerodynamic models are necessary to accurately simulate forces and develop feedback controllers for wings in agile motion; however, these models are often high dimensional or incompatible with modern control techniques.
Brunton, Steven L., Dawson, Scott T. M., Rowley, Clarence W.   +2 more
core   +1 more source

Digital Actuation Control of Soft Robotic Origami With Self‐Folding Liquid Crystal Elastomer Hinges

Advanced Functional Materials, EarlyView.
Self‐folding soft‐rigid hybrid robotic origami is enabled by liquid crystal elastomer actuators with embedded Joule heating and closed‐loop digital control. Digitally addressable hinges provide reversible and programmable transitions between distinct folded states while maintaining actuation performance at high cycle counts (over 1500).
David C. Bershadsky, Tuo Zhao, Glaucio H. Paulino, Emily C. Davidson   +3 more
wiley   +1 more source

Alleviation of unbalanced rotor loads by single blade controllers [PDF]

, 2009
A novel approach to reducing the unbalance rotor loads by pitch control is presented in this paper. Each blade has its own actuator, sensors and controller.
Dominguez, S., Leithead, W.E., Neilson, Victoria   +2 more
core  

Cyclic Pitch Control for the Reduction of Ultimate Loads on Wind Turbines [PDF]

, 2014
In this paper we study the use of individual blade pitch control as a way to reduce ultimate loads. This load alleviation strategy exploits the fact that cyclic pitching of the blades induces in general a reduction of the average loading of a wind ...
A. Croce, C.E.D. Riboldi, C.L. Bottasso, M. Salvetti   +3 more
core   +1 more source

Individual Pitch Control [PDF]

, 2012
With the increase in population, the needs of living a better life are demanding more energy supply. Moreover, environment and safety are important factors in development of any energy producing system. That's why renewable energy systems are most reliable if they are developed with qualitative and quantitative research.
openaire  

Ferroelectricity in Antiferromagnetic Wurtzite Nitrides

Advanced Functional Materials, EarlyView.
We establish MnSiN2${\rm MnSiN}_2$ and MnGeN2${\rm MnGeN}_2$ as aristotypes of a new multiferroic wurtzite family that simultaneously exhibits ferroelectricity and antiferromagnetism with altermagnetic spin splitting. By strategically substituting alkaline‐earth metals, we predict new materials with coexisting switchable polarization, spin texture, and
Steven M. Baksa, Lin‐Ding Yuan, Stephen D. Wilson, James M. Rondinelli   +3 more
wiley   +1 more source

Helicopter tail rotor thrust and main rotor wake coupling in crosswind flight [PDF]

, 2010
The tail rotor of a helicopter with a single main rotor configuration can experience a significant reduction in thrust when the aircraft operates in crosswind flight. Brown’s vorticity transport model has been used to simulate a main rotor and tail rotor
Balch D. T., Batra N. N., Johnston J. F., Kaynes I. W., Leishman J. G., Markiewicz R. H., Prouty R. W., Richard E. Brown, Timothy M. Fletcher, Toro E. F.   +9 more
core   +1 more source

2D Magnetic and Topological Quantum Materials and Devices for Ultralow Power Spintronics

Advanced Functional Materials, EarlyView.
2D magnets and topological quantum materials enable ultralow‐power spintronics by combining robust magnetic order with symmetry‐protected, Berry‐curvature‐driven transport. Fundamentals of 2D anisotropy and spin‐orbit‐coupling induced band inversion are linked to scalable growth and vdW stacking.
Brahmdutta Dixit, Yifei Yang, Shawn Li, Yu‐Chia Chen, Qi Jia, Jian‐Ping Wang   +5 more
wiley   +1 more source

Individual pitch control for load reduction of offshore wind turbine based on particle swarm optimization and fuzzy logic

IET Renewable Power Generation
As wind turbine grow in size, the uneven distribution of wind speeds within the rotor‐wept area results in unbalanced loads, which have become a significant factor affecting wind turbine performance. Load feedback‐based individual pitch control (IPC) for
Chuanzhi Zhang, Yijing Chen, Dawei Zhao, Chunhua Li, Xiaojiang Guo, Jing Bu   +5 more
doaj   +1 more source