Results 41 to 50 of about 174,771 (214)

Self healing control method against unmanned helicopter actuator stuck faults

, 2014
A self healing (SH) control framework is proposed in this paper against actuator stuck faults. For unmanned helicopters (UHs), the framework is composed by an active fault-tolerant control (FTC) system and reference redesign.
Ling Wang, Theilliol, Didier, Qi JT(齐俊桐), Jianda Han, Didier Theilliol, Qi X(齐欣), Zhang YM(张友民), Wang L(王玲), Wang, Ling, Qi, Xin, Zhang, Youmin, Qi, Juntong, Han, Jianda, Youmin Zhang, Juntong Qi, Han JD(韩建达), Xin Qi   +16 more
core   +1 more source

Dynamic Trajectory Replanning for Unmanned Aircrafts Supporting Tactical Missions in Urban Environments [PDF]

, 2011
In the last decade we witnessed an increased demand for employment of unmanned aerial vehicles (UAV) in practise. For instance, there is a growing need to provide surveillance tasks in a given area by a team of cooperating UAVs. In this case, the ability
Chrpa, Lukáš, Peter Novák, Novák, Peter, Lukáš Chrpa   +3 more
core   +1 more source

A high‐altitude thermal infrared method for estimating moose abundance and demography in Rocky Mountain National Park, USA

Wildlife Biology, Volume 2026, Issue 5, September 2026.
Resource managers require accurate estimates of large herbivore abundance and demography to maintain ecological integrity. Common methods to count these species, including observations from low altitude helicopter flights, may conflict with other protected area management objectives and struggle to produce precise estimates for more cryptic species. To
Hanem G. Abouelezz, N. Thompson Hobbs
wiley   +1 more source

Combined Grid and Feature-Based Occupancy Map Building in Large Outdoor Environments [PDF]

, 2007
This paper presents an approach to create three-dimensional occupancy maps from an aerial vehicle with stereo vision. The main idea is to create an occupancy grid that moves along with the vehicle and extract features into a fixed global map.
Goormann, Lukas, Andert, Franz, Franz Andert, Lukas Goormann   +3 more
core   +1 more source

Design of Unmanned Helicopter Distributed Electric Tail Rotor Controller Based on Improved Active Disturbance Rejection Control

IEEE Access
In response to the critical implications of single tail rotor failures in unmanned helicopters, this study proposes a distributed electric tail rotor yaw channel controller that employs Active Disturbance Rejection Control (ADRC) techniques.
Qing-Xin Zhang, Yun-Feng Ji, Feng Wang, Lei Pei, Zheng-Ming Cha   +4 more
doaj   +1 more source

Terrain and Radiation Mapping in Post-Disaster Environments Using an Autonomous Helicopter

Remote Sensing, 2012
Recent events have highlighted the need for unmanned remote sensing in dangerous areas, particularly where structures have collapsed or explosions have occurred, to limit hazards to first responders and increase their efficiency in planning response ...
Kevin Kochersberger, Bryan Krawiec, Jerry Towler   +2 more
doaj   +1 more source

Disturbance observer based sliding mode control for unmanned helicopter hovering operations in presence of external disturbances [PDF]

INCAS Bulletin, 2018
Numerous control techniques are developed for miniature unmanned helicopters to do hover operation with each method having its own advantages and limitations.
Ihsan ULLAH, Hai-Long PEI
doaj   +1 more source

Spatial Distribution and Environmental Factor Analysis of the Invasive Alien Species Spotted Lanternfly (Lycorma delicatula) in South Korea

Entomological Research, Volume 56, Issue 9, September 2026.
ABSTRACT The spotted lanternfly (Lycorma delicatula) is an invasive alien species that has rapidly expanded across South Korea since its population began to surge in 2006. This study analyzed the spatiotemporal distribution patterns and environmental drivers of the species following its nationwide expansion, utilizing national survey data from 2016 to ...
Minjun Kim, Jongchul Park, Youngho Cho, Youngjun Park   +3 more
wiley   +1 more source

Interactional aerodynamics and acoustics of a hingeless coaxial helicopter with an auxiliary propeller in forward flight [PDF]

, 2008
The aerodynamics and acoustics of a generic coaxial helicopter with a stiff main rotor system and a tail- mounted propulsor are investigated using Brown's Vorticity Transport Model.
Brown, R.E., Kenyon, A.R., Kim, Hyo Wan, Kenyon, Adam R., Duraisamy, K., Kim, H.W., Duraisamy, Karthikeyan, Brown, Richard   +7 more
core   +7 more sources

Simulation-based analysis of operational effectiveness using army weapon effectiveness analysis model of attack helicopter through manned–unmanned teaming (MUM-T) in plain, urban, and mountainous terrains environments

선진국방연구
This study quantitatively analyzed the operational effectiveness of helicopter Manned–Unmanned Teaming (MUM-T) across plains, urban, and mountainous environments.
Bohyung Lee, Seokjae Jeong
doaj   +1 more source