Results 61 to 70 of about 3,387,018 (354)

RESEARCH OF THE HIGH HARMONICS INDIVIDUAL BLADE CONTROL EFFECT ON VIBRATIONS CAUSED BY THE HELICOPTER MAIN ROTOR THRUST

Научный вестник МГТУ ГА, 2017
The paper presents numerical results analysis of main rotor vibration due to helicopter main rotor thrust pulsation.The calculation method, the object of research and numerical research results with the aim to reduce the amplitude of the vibrations ...
B. S. Kritsky, R. M. Mirgazov, Le Van Chung   +2 more
doaj  

Ionic‐Electronic Hydrogel‐Liquid Metal Composite Bilayer with Tissue‐Adaptive and Adhesive Properties for Closed‐Loop Neuroprosthetic System

Advanced Functional Materials, EarlyView.
A hydrogel–liquid metal composite peripheral nerve interface (HLB‐PNI) combines electrically durable electrodes and tissue‐adhesive hydrogel for tissue‐adaptive implantation. In nerve‐injured rats, it enables the diagnosis of sensory‐motor connectivity via stimulation and neural signal recording.
Yewon Kim, Kyoungryong Kim, Jaehyon Kim, Heewon Choi, Mikyung Shin, Donghee Son   +5 more
wiley   +1 more source

2-D CFD Computations of the Two-Bladed Darrieus-Type Wind Turbine

Journal of Applied Fluid Mechanics, 2018
In spite of the attractiveness of CFD methods and advanced measurement methods, there is still no full analysis of aerodynamic blade loads for vertical axis Darrieus-type wind turbines.
K. Rogowski, M. O. L. Hansen, P. Lichota
doaj  

Comparison of Shell and Solid Finite Element Models for the Static Certification Tests of a 43 m Wind Turbine Blade

Energies, 2018
A commercial 43 m wind turbine blade was tested under static loads. During these tests, loads, displacements, and local strains were recorded. In this work, the blade was modeled using the finite element method.
Mathijs Peeters, Gilberto Santo, Joris Degroote, Wim Van Paepegem   +3 more
doaj   +1 more source

Uncertainty identification of blade-mounted lidar-based inflow wind speed measurements for robust feedback–feedforward control synthesis [PDF]

Wind Energy Science, 2019
The current trend toward larger wind turbine rotors leads to high periodic loads across the components due to the non-uniformity of inflow across the rotor.
R. Ungurán, V. Petrović, L. Y. Pao, M. Kühn   +3 more
doaj   +1 more source

All‐Aqueous Pullulan Fibers Enabling Visible‐to‐Near‐Infrared Waveguiding with Mechanical and Thermal Resilience

Advanced Functional Materials, EarlyView.
Pullulan, a biomass‐derived polysaccharide, is transformed into transparent optical fibers using a solvent‐free borax hydrogel‐spinning method. The fibers outperform PMMA with ≈200 MPa tensile strength and 200 °C stability, while uniquely guiding visible‐to‐NIR light and enabling additive‐free humidity sensing.
Yuya Fukata, Aayush Kumar Jaiswal, Ari Hokkanen, Hannes Orelma, Tadahisa Iwata   +4 more
wiley   +1 more source

Aeroelastic Study of Downwind and Upwind Configurations Under Different Power Levels of Wind Turbines

Machines
Downwind wind turbines offer potential for reduced blade loads and lighter designs, yet systematic aeroelastic comparisons against upwind configurations remain limited, especially for multi-megawatt scales.
Zixuan Sun, Zhenye Sun, Yusheng Xia, Wenzhong Shen, Weijun Zhu, Esteban Ferrer   +5 more
doaj   +1 more source

Analysis of the DANAERO wind turbine field database to assess the importance of different state‐of‐the‐art blade element momentum (BEM) correction models

Energy Science & Engineering, 2021
Aerodynamic loads of wind turbine blades are often predicted by manufacturers using the blade element momentum (BEM) theory, for which many corrections have been proposed in the literature.
Thomas Potentier, Caroline Braud, Emmanuel Guilmineau, Arthur Finez, Colin Le Bourdat   +4 more
doaj   +1 more source

Prediction of low frequency and impulsive sound radiation from horizontal axis wind turbines [PDF]

, 1981
Theoretical models to predict the radiation of low frequency and impulsive sound from horizontal axis wind turbines due to three sources: (1) steady blade loads; (2) unsteady blade loads due to operation in a ground shear; (3) unsteady loads felt by the ...
Harris, W. L., Martinez, R., Widnall, S. E.   +2 more
core   +1 more source

Counterion Dependent Side‐Chain Relaxation Stiffens a Chemically Doped Thienothiophene Copolymer

Advanced Functional Materials, EarlyView.
Oxidation of a thienothiophene copolymer, p(g3TT‐T2), via different doping strategies and dopant molecules resulted in materials with similar oxidation levels and a high electrical conductivity of ≈100 S cm−1. However, mechanical properties varied significantly, with sub‐glass transition temperatures and elastic moduli spanning from –44°C to –3°C and ...
Mariavittoria Craighero, Meghna Jha, Elsa Veronica Flores‐Vela, Joost Kimpel, Andreas Schaefer, Jiali Guo, Jesika Asatryan, Alberto Peinador Veiga, Shuichi Haraguchi, Per‐Anders Carlsson, Jaime Martín, Mariano Campoy‐Quiles, Christian Müller   +12 more
wiley   +1 more source