Results 31 to 40 of about 189,174 (279)

Comparative Neuromechanical Wing‐Actuation Architectures of Flapping Flight in Insects, Hummingbirds, and Robots

Advanced Intelligent Systems, EarlyView.
Natural fliers achieve remarkable aerial performance through diverse wing neuromechanical systems integrating actuation, sensing, and control. This study synthesizes neuromechanical architectures in insects and hummingbirds, identifying two key functional types‐Dual Neural‐Mechanical Oscillator and Neurally‐modulated Mechanical Oscillator‐ and ...
Suyash Agrawal, Jean‐Michel Mongeau, Bret W. Tobalske, Christopher Rahn, Bo Cheng   +4 more
wiley   +1 more source

Characteristics of Shock Wave/Boundary Layer Interactions on Rotor Airfoils

Nanjing Hangkong Hangtian Daxue Xuebao
Utilizing the Reynolds‑averaged Navier‑Stokes （RANS） method in conjunction with a locally variable γ‑Rẽθt transition model， an in‑depth investigation is conducted on the characteristics of shock wave/boundary layer interaction （SWBLI） for the rotor ...
YANG Liuqing, ZHAO Guoqing, WANG Qing, JING Simeng, MA Li, ZHAO Qijun   +5 more
doaj   +1 more source

Numerical Study on Aerodynamic and Noise Responses of Rotor with Ramp Increase in Collective Pitch Based on Time-Accurate Free-Wake Method

Machines, 2023
Research on helicopter transient maneuvering flight noise is a hotspot and challenging topic in the fields of helicopter design and application. A new time-accurate free-wake (TAFW) method and the Fowcs Williams-Hawkings (FW–H) equations are applied to ...
Zhiyuan Hu, Runze Xia, Yongjie Shi, Guohua Xu   +3 more
doaj   +1 more source

Computational fluid dynamics model of a quad-rotor helicopter for dynamic analysis [PDF]

, 2016
The control and performance of a quad-rotor helicopter UAV is greatly influenced by its aerodynamics, which in turn is affected by the interactions with features in its remote environment. This paper presents details of Computational Fluid Dynamics (CFD)
Bousbaine, Amar, Poyi, Gwangtim Timothy, Wu, Mian Hong   +2 more
core   +2 more sources

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

Advanced Intelligent Systems, EarlyView.
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

Grinding Characteristics of MoS2-Coated Brazed CBN Grinding Wheels in Dry Grinding of Titanium Alloy

Chinese Journal of Mechanical Engineering, 2023
As an important green manufacturing process, dry grinding has problems such as high grinding temperature and insufficient cooling capacity. Aiming at the problems of sticking and burns in dry grinding of titanium alloys, grinding performance evaluation ...
Junshuai Zhao, Biao Zhao, Wenfeng Ding, Bangfu Wu, Ming Han, Jiuhua Xu, Guoliang Liu   +6 more
doaj   +1 more source

Investigation of a Compound Helicopter Flying the Depart and Abort Mission Task Element [PDF]

, 2017
The next generation of rotorcraft will have to satisfy the appropriate handling qualities requirements before entering service. Many of these vehicles will operate at significantly greater speeds than the conventional helicopter and will therefore have
Anderson, Dave, Ferguson, Kevin, Thomson, Douglas   +2 more
core  

Slip‐Adaptive Neural Control of Gecko‐Inspired Adhesive Robots

Advanced Intelligent Systems, EarlyView.
This study introduces a neural adhesion controller to improve the stability of gecko‐inspired climbing robots. By integrating an echo state network and a multilayer perceptron, the system utilizes joint torque feedback to accurately estimate adhesion in both normal and shear directions and predict slips. This enables effective recovery from slip events,
Donghao Shao, Jian Chen, Guangyuan Zang, Yang Li   +3 more
wiley   +1 more source

Research on Secondary Condensation Method Based on Substructure Method for Helicopter Tail Boom Model

Aerospace
The tail boom is a critical structural component of a helicopter, and accurately capturing its dynamic characteristics is essential; however, the inherent geometric and material complexity of the tail boom usually leads to large-scale finite element ...
Kunjian Jin, Xu Wang, Guoke Huang, Yingqi Zhang, Guorui Yu, Xiao Wang   +5 more
doaj   +1 more source

THE EFFECT OF DIFFERENT OPTIONS OF BLADES MAIN ROTOR ON THE X-SHAPED TAIL ROTOR OF THE MI-171 LL

Научный вестник МГТУ ГА, 2018
This paper describes the effect of different rotor blades on the X-shaped tail rotor of the Mi-171 LL, observed conducting flight tests. The tests were carried out on the same helicopter in the similar atmospheric conditions.The objective of the tests ...
V. A. Ivchin, V. A. Nikiforov, K. Yu. Samsonov   +2 more
doaj   +1 more source