Results 31 to 40 of about 383,309 (303)
How does human motor cortex regulate vocal pitch in singers? [PDF]
Royal Society Open Science, 2018 Vocal pitch is used as an important communicative device by humans, as found in the melodic dimension of both speech and song. Vocal pitch is determined by the degree of tension in the vocal folds of the larynx, which itself is influenced by complex and ...
Michel Belyk +2 more
doaj +1 more source
Individual blade pitch for yaw control
Journal of Physics: Conference Series, 2014 Individual pitch control (IPC) for reducing blade loads has been investigated and proven successful in recent literature. For IPC, the multi-blade co-ordinate (MBC) transformation is used to process the blade load signals from the rotating to a stationary frame of reference.
Navalkar, S.T. (author) +2 more
openaire +2 more sources
Feedback–feedforward individual pitch control for wind turbine load reduction [PDF]
International Journal of Robust and Nonlinear Control, 2008 AbstractThis paper focuses on the problem of wind turbine fatigue load reduction by means of individual pitch control (IPC). The control approach has a two‐degree‐of‐freedom structure, consisting of an optimal multivariable LQG controller and a feedforward disturbance rejection controller based on estimated wind speed signals.
Engelen, T.G. van +4 more
openaire +2 more sources
Development of Hardware-in-the-Loop-Simulation Testbed for Pitch Control System Performance Test
Energies, 2019 This paper deals with the development of a wind turbine pitch control system and the construction of a Hardware-in-the-Loop-Simulation (HILS) testbed for the performance test of the pitch control system.
Jongmin Cheon +4 more
doaj +1 more source
Flexure pitch bearing concept for individual pitch control of wind turbines
Wind Energy, 2017 AbstractThe excessive use of individual pitch control (IPC) for fatigue load reduction is accompanied by the uncertainty of potential bearing failures. This problem, which is due to the small swivel angles associated with IPC, arises because of the rolling and sliding contacts that occur with the rolling element bearings that are typically used.
Michael Juettner +2 more
openaire +1 more source
A Comparative Study of Optimal Individual Pitch Control Methods
Sustainability, 2023 Wind turbines are subjected to asymmetric loads and fatigue with subsequent increases in their dimension and capacity, leading to a reduction in their lifetime. To address this problem, the individual pitch control (IPC) technique is quite familiar in the control of wind turbines.
Abhinandan Routray +3 more
openaire +1 more source
Energies, 2021 Accurate and reproducible aeroelastic load calculations are indispensable for designing modern multi-MW wind turbines. They are also essential for assessing the load reduction capabilities of advanced wind turbine control strategies.
Sebastian Perez-Becker +3 more
doaj +1 more source
A Q‐Learning Algorithm to Solve the Two‐Player Zero‐Sum Game Problem for Nonlinear Systems
International Journal of Adaptive Control and Signal Processing, Volume 39, Issue 3, Page 566-581, March 2025.A Q‐learning algorithm to solve the two‐player zero‐sum game problem for nonlinear systems. ABSTRACT This paper deals with the two‐player zero‐sum game problem, which is a bounded L2$$ {L}_2 $$‐gain robust control problem. Finding an analytical solution to the complex Hamilton‐Jacobi‐Issacs (HJI) equation is a challenging task.
Afreen Islam +2 more
wiley +1 more source
Vibration Reduction Strategy for Offshore Wind Turbines
Applied Sciences, 2020 The operational environment of offshore wind turbines is much more complex than that of onshore wind turbines. Facing the persistent wind and wave forces, offshore wind turbines are prone to vibration problems, which are not conducive to their long-term ...
Haoming Liu +5 more
doaj +1 more source
Advanced Engineering Materials, EarlyView.Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt +8 more
wiley +1 more source