Results 51 to 60 of about 7,872 (156)

Real-time evolution of an embedded controller for an autonomous helicopter [PDF]

, 2008
In this paper we evolve the parameters of a proportional, integral, and derivative (PID) controller for an unstable, complex and nonlinear system. The individuals of the applied genetic algorithm (GA) are evaluated on the actual system rather than on a ...
Coupland, Simon, Gongora, Mario, Hopgood, Adrian A., Passow, Benjamin N.   +3 more
core   +2 more sources

Design Challenges to Expand the Functionality of Drones: Deformable Rotorcraft and Nature‐Inspired Flapping Drones

Advanced Intelligent Systems, Volume 8, Issue 3, March 2026.
This review systematically analyzes deformable drones, including extendable, foldable, and tilting configurations, along with nature‐inspired flapping rotorcraft. By classifying deformation principles and structural mechanisms, design trade‐offs, functional capabilities, and future development potential are highlighted.
Ju‐Hee Lee, Sumin Jung, Jinwoo Jang, Yeji Han, Minchae Kang, Jihun Seong, Suyeon Seo, Eunsol Park, Haesol Kwak, Min‐Woo Han   +9 more
wiley   +1 more source

Experimental study of nonlinear vibration characteristics of a two-rotor turbofan engine system with an intershaft support

Авіаційно-космічна техніка та технологія
The layout of the turbofan engine with coaxial rotors and intershaft rear support of the high-pressure rotor is the most compact one since the rear supports of both rotors are located in one oil cavity, provided with a joint system of communications for ...
Sergey Filipkovskij, Sergey Chaikin
doaj   +1 more source

Empirical measurements of small unmanned aerial vehicle co-axial rotor systems [PDF]

, 2011
Small unmanned aerial vehicles (SUAV) are beginning to dominate the area of intelligence, surveillance, target acquisition and reconnaissance (ISTAR) in forward operating battlefield scenarios.
Bell, Jonathon, Prior, Stephen D.
core  

Quantification of rheological parameters in deep‐sea mining plumes

Deep Underground Science and Engineering, Volume 5, Issue 1, Page 250-265, March 2026.
This study explores the variations in rheological properties observed during the propagation of deep‐sea mining plumes, utilizing rheological test data obtained from kaolin clay plumes. Subsequently, taking into account the differences in sediment properties, the effects of clay content and clay mineral composition on the rheological parameters of ...
Xiaolei Liu, Yihan Liu, Yonggang Jia, Xingsen Guo   +3 more
wiley   +1 more source

Simulation and Experimental Investigation of Low‐Speed Centrifugal Pump Coupled With Vertical Ultra‐Low‐Head Turbine for Small‐Scale Irrigation

Engineering Reports, Volume 8, Issue 3, March 2026.
From the reviews, a new concept of a low‐speed centrifugal pump (LSCP) driven by a vertical ultra‐low‐head hydro turbine (VULHT) was designed and tested on simulation and physical setup. It was performed with a 1.8 m delivery head, concluding as inefficient. For ultra‐low‐head conditions, different than centrifugal action is recommended.
Raj Kumar Chaulagain, Pratik Ghimire, Saugat Ojha, Pratik Bhusal, Ankit Gautam   +4 more
wiley   +1 more source

Aerodynamic loading on sharp and blunt trailing-edged rotor blades at high advance ratio

Advances in Aerodynamics
Reverse flow on the retreating side of a rotor disk is an intrinsic aerodynamic limitation of high-speed, high advance ratio rotorcraft. For traditional single main rotor helicopters, the influence of flow reversal is not significant, but it is important
Oliver D. Wild, Matthew J. Murphy, Anya R. Jones   +2 more
doaj   +1 more source

Ions as Architects of DNA Nanostructures: Mechanisms, Simulations, and Technological Frontiers

Small Structures, Volume 7, Issue 3, March 2026.
Ions are not merely passive electrolytes but active regulators of DNA nanostructures. This review shows how ion valence, hydration, and specificity govern electrostatic screening, correlation, and confinement, enabling DNA origami, metallized DNA, nanopores, hydrogels, DNAzymes, molecular machines, and energy devices through integrated experimental and
Sergiy Perepelytsya, Dmytro Piatnytskyi, Tetiana Bubon, Narcis Cibotariu, Aatto Laaksonen, Francesca Mocci   +5 more
wiley   +1 more source

Applying rotorcraft modelling technology to renewable energy research [PDF]

, 2009
The perceived need to reduce mankind's impact on the global climate motivates towards a future society in which a significant proportion of its energy needs will be extracted from the winds and the tides of the planet.
Brown, R.E., Fletcher, Timothy M., Kelly, Mary E., Kim, Hyo Wan, Phillips, Catriona, Scheurich, Frank   +5 more
core  

Advances in Triboelectric Nanogenerators With Rotating Structure

Carbon Energy, Volume 8, Issue 2, February 2026.
The rotating TENG has been widely studied for its superiorities of simple structure, high efficiency, and stable output. This review introduced the four different principles of rotating TENG and offered a thorough summary for performance and application research through three‐level classification. Importantly, the current existing problems, challenges,
Chuguo Zhang, Chunxu Xue, Yutong Chen, Yujie Qiang, Seeram Ramakrishna   +4 more
wiley   +1 more source