Results 21 to 30 of about 4,542,550 (227)

Determination of protection system requirements for DC UAV electrical power networks for enhanced capability and survivability [PDF]

, 2011
A growing number of designs of future Unmanned Aerial Vehicle (UAV) applications utilise dc for the primary power distribution method. Such systems typically employ large numbers of power electronic converters as interfaces for novel loads and generators.
Burt, Graeme, Norman, Patrick, Galloway, Stuart, Fletcher, Steven   +3 more
core   +4 more sources

Mapping <i>Lupinus polyphyllus</i> density and distribution along road verges using unmanned aerial vehicle (UAV)-based remote sensing. [PDF]

Appl Plant Sci
Abstract Premise Road verges function as refuges for semi‐natural species, but they can also facilitate the spread of non‐native plants such as Lupinus polyphyllus. Unmanned aerial vehicle (UAV)–based remote sensing is a promising tool for mapping these species; however, its application in roadside contexts remains limited.
Blomqvist EL, Andersson JO, Eckstein RL, Haas J.   +3 more
europepmc   +2 more sources

EFFECT OF THE DOWNWASH FLOW FIELD OF A SINGLE-ROTOR UAV ON DROPLET VELOCITY IN SUGARCANE PLANT PROTECTION [PDF]

Engenharia Agrícola, 2021
Protecting against the main sugarcane diseases and insect pests requires good control at the base of the plant; therefore, higher droplet penetration is required during plant protection.
Ping Zhang, Wei Zhang, Haitian Sun, Haiba Fu, Jiansheng Liu   +4 more
doaj   +1 more source

Performance-guaranteed distributed control for multiple plant protection UAVs with collision avoidance and a directed topology

Frontiers in Plant Science, 2022
The urgent requirement for improving the efficiency of agricultural plant protection operations has spurred considerable interest in multiple plant protection UAV systems. In this study, a performance-guaranteed distributed control scheme is developed in
Hanqiao Huang, Hantong Mei, Tian Yan, Bolan Wang, Feihong Xu, Daming Zhou   +5 more
doaj   +1 more source

Productivity model and experiment of field crop spraying by plant protection unmanned aircraft

Frontiers in Plant Science, 2023
Traditional agricultural production requires numerous human and material resources; however, agricultural production efficiency is low. The successful development of plant protection unmanned aerial vehicles (UAVs) has changed the operation mode of ...
Weicai Qin, Weicai Qin, Panyang Chen, Baokun Wang   +3 more
doaj   +1 more source

Improved Q-Learning Algorithm Based on Approximate State Matching in Agricultural Plant Protection Environment

Entropy, 2021
An Unmanned Aerial Vehicle (UAV) can greatly reduce manpower in the agricultural plant protection such as watering, sowing, and pesticide spraying. It is essential to develop a Decision-making Support System (DSS) for UAVs to help them choose the correct
Fengjie Sun, Xianchang Wang, Rui Zhang
doaj   +1 more source

Design and Spray Performance Evaluation of an Air–Ground Cooperation Stereoscopic Plant Protection System for Mango Orchards

Agronomy, 2023
With the aim of solving the problems of high labor intensity, low operational efficiency, and poor deposition distribution uniformity in the mango canopy associated with traditional plant protection devices, an air-ground co-operation stereoscopic plant ...
Yangfan Li, Leng Han, Limin Liu, Zhan Huang, Changling Wang, Xiongkui He   +5 more
doaj   +1 more source

Design and validation of a multi-objective waypoint planning algorithm for UAV spraying in orchards based on improved ant colony algorithm

Frontiers in Plant Science, 2023
IntroductionCurrent aerial plant protection with Unmanned Aerial Vehicles (UAV) usually applies full coverage route planning, which is challenging for plant protection operations in the orchards in South China.
Haoxin Tian, Haoxin Tian, Haoxin Tian, Zhenjie Mo, Zhenjie Mo, Zhenjie Mo, Chenyang Ma, Junqi Xiao, Junqi Xiao, Junqi Xiao, Ruichang Jia, Ruichang Jia, Ruichang Jia, Yubin Lan, Yubin Lan, Yubin Lan, Yali Zhang, Yali Zhang, Yali Zhang   +18 more
doaj   +1 more source

The computational fluid dynamic modeling of downwash flow field for a six-rotor UAV [PDF]

Frontiers of Agricultural Science and Engineering, 2018
The downwash flow field of the multi-rotor unmanned aerial vehicle (UAV), formed by propellers during operation, has a significant influence on the deposition, drift and distribution of droplets as well as the spray width of the UAV for plant protection.
Yongjun ZHENG, Shenghui YANG, Xingxing LIU, Jie WANG, Tomas NORTON, Jian CHEN, Yu TAN
doaj   +1 more source

Modeling and simulation enabled UAV electrical power system design [PDF]

, 2011
With the diversity of mission capability and the associated requirement for more advanced technologies, designing modern unmanned aerial vehicle (UAV) systems is an especially challenging task.
Rakhra, Puran, Burt, Graeme, Norman, Patrick, Galloway, Stuart, Fletcher, Steven, Lowe, V.   +5 more
core   +4 more sources