Results 21 to 30 of about 485,912 (124)

Vibration and Performance Analyses Using Individual Blade Pitch Controls for Lift-Offset Rotors

International Journal of Aerospace Engineering, 2019
This work attempts to reduce the hub vibratory loads of a lift-offset rotor using IBC (individual blade pitch control) in high-speed forward flight. As a lift-offset rotor for the present study, the rigid coaxial rotor of a XH-59A compound helicopter is ...
Jae-Sang Park, Do-Hyung Kim, Sanghyun Chae, Ye-Lin Lee, Jeong-In Go   +4 more
doaj   +1 more source

Interactional aerodynamics and acoustics of a propeller-augmented compound coaxial helicopter [PDF]

, 2008
The aerodynamic and acoustic characteristics of a generic hingeless coaxial helicopter with a tail-mounted propulsor and stabiliser have been simulated using Brown's Vorticity Transport Model.
Kim, Hyo Wan, Kenyon, Adam R., Duraisamy, Karthikeyan, Brown, Richard   +3 more
core   +4 more sources

Sulfide‐Based Electrolytes for All‐Solid‐State Sodium Batteries

Advanced Energy Materials, EarlyView.
This review covers the structural features and synthesis strategies of sulfide‐based solid electrolytes, as well as critical challenges related to conductivity, interfacial and moisture stability, and scaling‐up for practical application in Sodium‐based All Solid‐State Batteries.
Han Yang, Luca Weckelmann, Baolin Wu, Chih‐Long Tsai, Luc Raijmakers, Rüdiger‐A. Eichel, Anna Windmüller   +6 more
wiley   +1 more source

Review of coupled rotor-fuselage dynamics design methodology for coaxial rigid rotor helicopter

Hangkong gongcheng jinzhan
The coaxial rigid rotor configuration offers compact design, high hover efficiency, and high-speed potential, but its coupled rotor-fuselage dynamics remain a key bottleneck. This paper reviews progress and challenges in three areas: theoretical modeling,
GAO Xiaodong, CHENG Qiyou, CHEN Hao, LIANG Kun, YIN Peng   +4 more
doaj   +1 more source

Performance and Vibration Analyses of Lift-Offset Helicopters

International Journal of Aerospace Engineering, 2017
A validation study on the performance and vibration analyses of the XH-59A compound helicopter is conducted to establish techniques for the comprehensive analysis of lift-offset compound helicopters.
Jeong-In Go, Do-Hyung Kim, Jae-Sang Park
doaj   +1 more source

Computational Role in Thermal Engineering and Chemical Analytics During the Rotating Disk of Generalized Williamson Viscosity and Thermal Conductivity

Advanced Physics Research, EarlyView.
The schematic diagram shows the flow configuration of the model. The swirling flow of shear‐thinning materials is significantly investigated under the influence of mixed convection. In addition, heat and mass transfer flow characteristics along with gyrotactic microorganisms is also investigated. ABSTRACT Thermal conductivity, temperature gradient, and
Latif Ahmad, Hafiz Ur Rahman, Umair Khan, Syed Modassir Hussain   +3 more
wiley   +1 more source

An rVPM-Based Aerodynamic Hybrid Optimization Method for Coaxial Rotor with Differentiated Upper and Lower Blades in Both Hover and High-Speed Cruising States

Aerospace
To enhance the performance of rigid coaxial rotors across both hovering and high-speed cruising conditions, this study develops a novel aerodynamic optimization method that differentiates between the upper and lower rotors. Utilizing the lifting line and
Zhiwei Ding, Dengyan Duan, Chaoqun Zhang, Jianbo Li   +3 more
doaj   +1 more source

A Compact Annular Electrostatic Clutch Joint: Dynamic Response Modeling and Time‐Sharing Control for Underactuated Robots

SmartBot, EarlyView.
Electrostatic clutches offer programmable variable stiffness for multi‐DOF robots, but their continuous motion is usually bottlenecked by spatial constraints and detachment delays. Here, the authors report a compact annular electrostatic clutch joint with a biphasic amplitude‐frequency modulation strategy to rapidly mitigate residual polarization ...
Haochen Yong, Jian Wang, Zhisheng Xia, Zhexuan Li, Han Ding, Zhigang Wu   +5 more
wiley   +1 more source

Aerodynamic optimization of a coaxial rotor system using a deep learning-based multi-fidelity surrogate model

Engineering Applications of Computational Fluid Mechanics
This paper introduces a multi-fidelity surrogate-based optimization framework that employs deep learning techniques for aerodynamic optimization of the X2TD coaxial rotor system in hover.
Shu-Hui Qin, Ai-Ming Yang
doaj   +1 more source

Detection of Ring Structure and Its Flexibility in Periplasmic Region of FliL, Bacterial Flagellar Stator‐Associate Protein, in Marine Vibrio

Molecular Microbiology, EarlyView.
FliL, a single‐pass transmembrane flagellar protein with a large periplasmic domain, associates with the basal body and supports motor function under high‐load conditions (e.g., viscous environments). The periplasmic domain of deletion mutant FliL forms a flexible ring structure, likely reflecting the capacity of the full‐length protein to adaptively ...
Tatsuro Nishikino, Norihiro Takekawa, Raymond Burton‐Smith, Yuki Tajimi, Kazuyoshi Murata, Takayuki Uchihashi, Seiji Kojima, Katsumi Imada, Michio Homma   +8 more
wiley   +1 more source