Results 41 to 50 of about 74,073 (217)

Smoke Diffusion Characteristics for Smoke Generator Based on Turbojet

Nanjing Hangkong Hangtian Daxue Xuebao
Based on the discrete phase model in the simulation software FLUENT， the smoke diffusion characteristics under high-speed jet action of a smoke generator powered by a turbojet engine are calculated.
CAO Guangzhou, REN Rui, SUN Hongliang
doaj   +1 more source

Deep Reinforcement Learning Approaches for Sensor Data Collection by a Swarm of UAVs

Advanced Intelligent Systems, EarlyView.
This article presents four decentralized reinforcement learning algorithms for autonomous data harvesting and investigates how collaboration improves collection efficiency. It also presents strategies to minimize training times by improving model flexibility, enabling algorithms to operate with varying number of agents and sensors.
Thiago de Souza Lamenza, Bruno José Olivieri de Souza, Markus Endler   +2 more
wiley   +1 more source

Chance-constrained optimal power flow for improving line flow and voltage security of power transmission networks

Autonomous Intelligent Systems
With the growing penetration of renewable energy, the impact of renewable uncertainties on power system secure operation is of increasing concern. Based on a recently developed linear power flow model, we formulate a chance-constrained optimal power flow
Yaodan Cui, Yue Song, Kairui Feng, Haonan Xu, Qinyu Wei, Kaiyu Li   +5 more
doaj   +1 more source

Visualization Techniques for Spray Monitoring in Unmanned Aerial Spraying Systems: A Review

Agronomy
Unmanned Aerial Spraying Systems (UASS) has rapidly advanced precision crop protection. However, the spray performance of UASSs is influenced by nozzle atomization, rotor-induced airflow, and external environmental conditions.
Jungang Ma, Hua Zhuo, Peng Wang, Pengchao Chen, Xiang Li, Mei Tao, Zongyin Cui   +6 more
doaj   +1 more source

Unmanned aerial vehicle bypass training system

Технічна інженерія, 2020
The problem of creating a system for simulating the flight of an unmanned aircraft or remotely piloted aircraft system between buildings is solved, which uses multi-mode flight control by dividing the trajectory of the unmanned aircraft into several ...
M.S. Graf
doaj   +1 more source

Superior through‐plane thermal conductivity in carbon fibers/spherical graphene/epoxy laminated composites for low‐altitude aircrafts

InfoMat, EarlyView.
To address the low through‐plane thermal conductivity (λ⊥) of carbon fiber/epoxy composites, which poses thermal management challenges in the expanding low‐altitude economy, we incorporated spherical thermally reduced graphene (s‐TRG) as a bridging filler. This architectural design achieved a λ⊥ of 2.73 W m–1 K–1 at 10 wt% loading.
Shengyuan Gao, Hua Guo, Yongqiang Guo, Hua Qiu, Wei Gong, Junwei Gu   +5 more
wiley   +1 more source

Laminar composite materials for unmanned aircraft wings

Defense and Security Studies, 2022
Unmanned Aerial Vehicles (UAVs) have high popularity, especially in the military field, but are now also being applied to the private and public sectors. One of the UAV components that require high material technology is the wing.
Mala Utami, Jonathan Ernest Sirait, Beny Budhi Septyanto, Aries Sudiarso, I Nengah Putra Apriyanto   +4 more
doaj   +1 more source

A review of the FATIMA Yellow Sea field campaign research

Quarterly Journal of the Royal Meteorological Society, EarlyView.
The FATIMA marine fog project took place over the Sable Island region of eastern Canada (summer 2022) and the Yellow Sea of the Republic of Korea (ROK, summer 2023). Its goals are to improve marine fog monitoring and forecasting. Instrumented multiple research vessels, aircraft, tethered balloon and autonomous systems, ocean observation sites, and ...
Seok Lee, Ismail Gultepe, H. J. S. Fernando, Saša Gaberšek, Luc Lenain, Qing Wang, Edward D. Creegan, Eric Pardyjak, Clive Dorman, Lossif Lozovatsky, David G. Ortiz‐Suslow, Jesus Ruiz‐Plancarte, Ryan Yamaguchi, Eren Gultepe, S. Hoch, A. Perelet, D. Singh, Joo Wan Cha, Lian Shen, Anup Vaman Barve, Anne Dowling, Sen Wang, Gianina Giacosa, Laurent Grare, Peter Taylor, Zheqi Chen, Rachel Y.‐W. Chang, Piyush Teeloku, Nicholas Gapp, Seung‐Woo Lee, Jong‐Min Jeong, Hojin Kim, Jin‐Yong Jeong, Ki‐Young Heo, Minsang Kim, Myung‐Sook Park, Kyung‐Hee Oh, Joon‐Seong Park, Dong‐Chull Jeon, Kyu‐Min Song, Jae‐Yeob Kim, Dawoon Jung, Kyung‐Il Chang, Jae Hak Lee, Kyung Man Kim, Daehun Yu, Seong Soo Yum, Andrew J. Heymsfield, Martin Agelin‐Chaab, Tae‐Young Goo, Dong‐Gyun Ryu   +50 more
wiley   +1 more source

Actuator Disk Model with Improved Tip Loss Correction for Hover and Forward Flight Rotor Analysis

Aerospace, 2023
A novel actuator disk model (ADM) coupled with lifting-line theory is proposed in this paper. Several virtual planform blades are placed on a disk plane with a constant azimuthal interval, and the lifting-line theory is applied to each blade to predict ...
Chankyu Son, Taewoo Kim
doaj   +1 more source

Sliding Mode Control in Aerospace Applications: A Survey

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT Sliding mode control (SMC) enjoys robustness to matched and unmatched (in the case of minimum phase input‐output dynamics) bounded perturbations, and finite time convergence. Second‐order and higher‐order sliding mode control systems (2‐SMC/HOSMC) retain all the advantages of sliding mode control, but in addition can be applied to systems of ...
Yuri Shtessel, Christopher Edwards
wiley   +1 more source