Results 21 to 30 of about 13,668 (246)

Three-Dimensional Velocity Obstacle Method for UAV Deconflicting Maneuvers

AIAA Guidance, Navigation, and Control Conference, 2015
Autonomous systems are required in order to enable UAVs to conduct self-separation and collision avoidance, especially for flights within the civil airspace system. A method called the Velocity Obstacle Method can provide the necessary situational awareness for UAVs in a dynamic environment, and can help to generate a deconflicting maneuver.This paper ...
Jenie, Y.I. (author), Van Kampen, E.J. (author), De Visser, C.C. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)   +4 more
openaire   +3 more sources

A real-time ship encounter collision risk detection approach in close-quarters situation

Measurement + Control, 2023
In order to identify ship collision risk for the security of maritime transportation in a close-quarters situation, a novel real-time ship collision risk awareness approach is proposed by developing a novel non-linear velocity obstacle set, QSD-NLVO ...
Bowen Sui, Jianqiang Zhang, Zhong Liu
doaj   +1 more source

Ship collision avoidance control based on improved velocity obstacle method

Journal of Physics: Conference Series, 2023
Abstract The velocity obstacle method has extensive research in collision avoidance, which uses circles to represent robots or ships to find a collision-free velocity. To better describe the motion characteristics of ships, an improved velocity obstacle method based on elliptical ship domain is proposed in this paper.
Fangwei Luo, Jie Yang
openaire   +1 more source

Study of a Rarefied Gas Driven by the Lid of a Micro cavity with a Diamond-Shaped Obstacle Using SRT-LBM [PDF]

EPJ Web of Conferences
The present study numerically investigates the flow and temperature behavior of a rarefied gas confined in a two-dimensional square lid-driven micro-cavity, with particular emphasis on the influence of a centrally located diamond-shaped obstacle.
Bouhouchi Yassine, Maiss Meryem, Qaffou Mohsine, Ighris Youness, Elaaddam Brahim, El Guennouni Youssef, Baliti Jamal, Hssikou Mohamed   +7 more
doaj   +1 more source

Cooperative Obstacle Avoidance for Multiple UAVs Using Spline_VO Method

Sensors, 2022
In order to solve multiple unmanned aerial vehicle (UAV) dynamic collision avoidance, a cooperative obstacle avoidance algorithm considering UAV’s kinematic constraints has been developed.
Mingzhu Peng, Wei Meng
doaj   +1 more source

Research of Dynamic Obstacle Avoidance of Manipulator based on Artificial Potential Field Method of Velocity Field

Jixie chuandong, 2020
In order to improve the safety and accuracy of the manipulator in dynamic obstacle avoidance，an artificial potential field collision avoidance algorithm based on velocity field is proposed.Firstly，the attracted velocity field is established to obtain the
Shi Yafei, Zhang Li, Liu Zixuan, Lü Yiping   +3 more
doaj  

Unmanned Aerial Vehicle Obstacle Avoidance Based Custom Elliptic Domain

Drones
The velocity obstacles (VO) method is widely employed in real-time obstacle avoidance research for UAVs due to its succinct mathematical foundation and rapid, dynamic planning abilities.
Yong Liao, Yuxin Wu, Shichang Zhao, Dan Zhang   +3 more
doaj   +1 more source

Phase Field Failure Modeling: Brittle‐Ductile Dual‐Phase Microstructures under Compressive Loading

Advanced Engineering Materials, EarlyView.
The approach by Amor and the approach by Miehe and Zhang for asymmetric damage behavior in the phase field method for fracture are compared regarding their fitness for microcrack‐based failure modeling. The comparison is performed for the case of a dual‐phase microstructure with a brittle and a ductile constituent.
Jakob Huber, Jan Torgersen, Ewald Werner
wiley   +1 more source

Karl Popper and the Mechanisms of Hydrogen Embrittlement

Advanced Engineering Materials, EarlyView.
Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley   +1 more source

Three-Dimensional Flight Conflict Detection and Resolution Based on Particle Swarm Optimization

Aerospace, 2023
This paper presents a conflict detection and resolution method based on a velocity obstacle method for flight conflicts in a three-dimensional space. With the location and speed information of the two aircraft, the optimal relief strategy is obtained ...
Weijun Pan, Liru Qin, Qinyue He, Yuanjing Huang   +3 more
doaj   +1 more source