Results 41 to 50 of about 19,013 (214)
Maneuverability assessment of a compound helicopter configuration [PDF]
, 2016 The compound helicopter design could potentially satisfy the new emerging requirements placed on the next generation of rotorcraft. The main benefit of the compound helicopter is its ability to reach speeds that significantly surpass those of the ...
Ferguson, Kevin, Thomson, Douglas
core +1 more source
Titan's Plains Revealed: Evidence for a Layered Surface
Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.Abstract Undifferentiated plains are the most common terrain type on Titan, yet their composition and geologic history remain poorly understood. To better characterize their physical properties, we combined Cassini RADAR measurements from nadir altimetry and side‐looking SAR modes. We analyzed these data using radar backscatter models, finding that the
A. Fine +3 more
wiley +1 more source
Trajectory Tracking Based on Active Disturbance Rejection Control for Compound Unmanned Aircraft
Aerospace, 2022 The compound unmanned aircraft is provided with three primary flight modes, which are helicopter flight mode in low forward speed flight, airplane flight mode in high forward speed flight and transition flight mode in middle forward speed flight. For the
Bohai Deng, Jinfa Xu
doaj +1 more source
Mars Science Helicopter Conceptual Design [PDF]
, 2020 Robotic planetary aerial vehicles increase the range of terrain that can be examined, compared to traditional landers and rovers, and have more near-surface capability than orbiters. Aerial mobility is a promising possibility for planetary exploration as
Balaram, Jayarao +15 more
core +1 more source
Advanced Theory and Simulations, Volume 9, Issue 1, January 2026.This study develops a superconvergent meshless method to analyze and control vibrations in twisted, bidirectional functionally graded Terfenol‐D beams. By optimizing magnetostrictive patch placement, it demonstrates effective vibration suppression under dynamic loads, highlighting the design potential of strategically graded materials in complex ...
Mukund A. Patil +2 more
wiley +1 more source
The Overall Design of Variable Diameter Ducted Fan in the Aircraft
Aerospace, 2022 Variable diameter rotor can improve the flight performance of the aircraft both in hovering and forward flying and a duct can improve the rotor performance further both in force and efficiency.
Yadong Gao, Yang Xu
doaj +1 more source
Assessment of the Feasibility of an Extended Range Helicopter Operational Standard for Offshore Flights [PDF]
, 2018 The accident rate of rotorcraft has improved signi1cantly over the years but at a slow pace, and in any case the number of accidents per 2ight hours is one or two orders of magnitude higher than that of commercial aircraft, a consideration that could ...
Barakos, George +14 more
core
Flexible collaborative transportation by a team of rotorcraft
, 2019 We propose a combined method for the collaborative transportation of a suspended payload by a team of rotorcraft. A recent distance-based formation-motion control algorithm based on assigning distance disagreements among robots generates the acceleration
de Marina, Hector Garcia, Smeur, Ewoud
core +1 more source
IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.The document proposes the micro‐Doppler spectral feature‐guided LFMCW radar detection algorithm (MDSF‐LRDA) to solve the high false alarm problem of detecting hovering rotor UAVs in cluttered environments, a limitation that plagues traditional radar methods relying on significant Doppler shifts.
Tao Chen, Jianbo Zhao, Lutao Liu
wiley +1 more source
AIP Advances, 2021 The dynamic modeling of structures in a thermal environment has become a new research topic in structural dynamics. Uncertainties caused by noise or material variability increase the difficulty in structural dynamic modeling when considering thermal ...
Zhe Chen, Huan He, Qi-jun Zhao
doaj +1 more source