Results 11 to 20 of about 336,079 (296)

The Bird Strike Challenge

open access: yesAerospace, 2020
Collisions between birds and aircraft pose a severe threat to aviation and avian safety. To understand and prevent these bird strikes, knowledge about the factors leading to these bird strikes is vital.
Isabel C. Metz   +4 more
doaj   +1 more source

Study of Model Uncertainties Influence on the Impact Point Dispersion for a Gasodynamicaly Controlled Projectile

open access: yesSensors, 2022
The article presents the analysis of the impact point dispersion reduction using lateral correction thrusters. Two types of control algorithms are used and four sources of uncertainties are taken into account: aerodynamic parameters, thrust curve ...
Mariusz Jacewicz   +3 more
doaj   +1 more source

CFD Aided Ship Design and Helicopter Operation

open access: yesJournal of Marine Science and Engineering, 2022
In support of Canadian industrial and defence ship design and offshore helicopter operations, a series of Ship–Helicopter Operational Limits Analysis and Simulation (SHOLAS) projects are being conducted at the National Research Council Canada (NRC) in ...
Weixing Yuan   +5 more
doaj   +1 more source

Evaluation method of privacy protection effect based on multi-layer fuzzy comprehensive evaluation

open access: yes网络与信息安全学报, 2020
Aiming at the problem that the evaluation of the privacy protection effect from a single data level cannot describe the overall privacy protection effect of the network environment, with the help of the fuzzy comprehensive evaluation method, the privacy
YU Yihan, FU Yu, WU Xiaoping
doaj   +1 more source

A hierarchical indexing strategy for optimizing Apache Spark with HDFS to efficiently query big geospatial raster data

open access: yesInternational Journal of Digital Earth, 2020
Earth observations and model simulations are generating big multidimensional array-based raster data. However, it is difficult to efficiently query these big raster data due to the inconsistency among the geospatial raster data model, distributed ...
Fei Hu   +7 more
doaj   +1 more source

A Simulation Framework of Unmanned Aerial Vehicles Route Planning Design and Validation for Landslide Monitoring

open access: yesRemote Sensing, 2023
Unmanned aerial vehicles (UAVs) have emerged as a highly efficient means of monitoring landslide-prone regions, given the growing concern for urban safety and the increasing occurrence of landslides.
Dongmei Xie   +5 more
doaj   +1 more source

Handling Qualities Analysis of an Unmanned Aircraft Vehicle for Agricultural Spraying

open access: yesJournal of Aerospace Technology and Management, 2020
The use of unmanned aircraft vehicles (UAVs) for the most diverse aeronautic missions is a reality. Then, with the rise of precision agriculture (PA), the viability of the incorporation of this technology in the countryside on both big and small ...
Artur Gustavo Slongo   +3 more
doaj   +1 more source

Clear Air Turbulence Resolved by Numerical Weather Prediction Model Validated by Onboard and Virtual Flight Data

open access: yesGeophysical Research Letters, 2023
A clear air turbulence (CAT) occurred on 30 December 2020 over Tokyo, Japan. The CAT was largely generated by breaking Kelvin‐Helmholtz (KH) instability waves in the free atmosphere.
R. Yoshimura   +5 more
doaj   +1 more source

Analytical and simulation model of fighter flight dynamics with a limiter for the permissible flight envelope when performing the split-S maneuver

open access: yesНаучный вестник МГТУ ГА, 2023
The article substantiates the relevance to develop an analytical-simulation model of fighter flight dynamics with a limiter for the permissible flight envelope during the split-S maneuver. The structure of the analytical and simulation model of a fighter,
P. S. Kostin, K. A. Zhuravskiy
doaj   +1 more source

Simulation Model to Calculate Bird-Aircraft Collisions and Near Misses in the Airport Vicinity

open access: yesAerospace, 2018
Annually, thousands of birds collide with aircraft. The impact usually has lethal consequences for the bird, the involved aircraft can experience severe damage. The highest bird strike risk occurs at low altitudes.
Isabel C. Metz   +6 more
doaj   +1 more source

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