Results 11 to 20 of about 189,174 (279)

A simulation model for the electrical rotary-wing aircraft (eVTOL) performance estimation for the urban air mobility purposes

Научный вестник МГТУ ГА, 2023
The present paper presents a simulation model description developed for the aircraft performance estimation of the most popular electric vertical takeoff and landing aircraft (eVTOL) aerodynamic configurations with the electric (hybrid) power plant for ...
M. I. Myasnikov, I. R. Ilyin
doaj   +1 more source

Numerical calculation and analysis of aero-acoustic characteristics of tilt rotor in different tilt angles

Xibei Gongye Daxue Xuebao
The numerical calculation model for the aero-acoustic analysis of a tilt rotor was established by combining the free wake method and the FW-H (Ffowcs Williams-Hawkings) equation.
YUAN Mingchuan, SUN Huixun, LI Zhibin, NIU Qingfeng, FAN Feng   +4 more
doaj   +1 more source

Research of effect of aerodynamic interference between rotors on vortex ring state of quadrotor aircraft

Xibei Gongye Daxue Xuebao
To investigate the impact of the aerodynamic interference among multirotors on the characteristics of vortex rings and their underlying mechanisms, a combination of detached eddy simulation (DES) and overset grid methods to simulate the unsteady ...
LI Yinhan, SU Dacheng, YANG Renguo, WU Linghua, HUANG Shuilin   +4 more
doaj   +1 more source

Analysis of aerodynamic characteristics of helicopter biplane tailplane

Xibei Gongye Daxue Xuebao
To analyze the aerodynamic characteristics of helicopter biplane tailplane, computational models for helicopter biplane tailplane and monoplane tailplane were established via CFD.
SUN Huixun, SUN Pengpeng, YANG Yongfei, YUAN Mingchuan, FAN Feng, LIN Yongfeng   +5 more
doaj   +1 more source

Development and Application of Special Extinguishing Agent Concentration Measurement

Hangkong gongcheng jinzhan, 2020
It is necessary to measure the situation of extinguishing agent concentration along with time in the ground simulation test of helicopter/airplane powerplant.
WU Yanyan, YANG Xiaolong, LI Haitao, LUO Tiegou, ZHENG Youlan, MIN Xingming   +5 more
doaj   +1 more source

Variable-speed tail rotors for helicopters with variable-speed main rotors [PDF]

, 2017
Variable tail rotor speed is investigated as a method for reducing tail rotor power, and improving helicopter performance. A helicopter model able to predict the main rotor and tail rotor powers is presented, and the flight test data of the UH-60A ...
Barakos, G.N., Han, D.
core   +1 more source

Transient Vibration Loads Characteristics Analysis of Variable Speed Rotor

Applied Sciences
To investigate the rotor vibration loads during the variable speed transient process, a transient rotor aeroelastic method based on the medium beam deformation theory and Hamilton’s principle is developed to simulate the rotor transient dynamic loads in ...
Zhihao Yu, Chunhua Li, Jian Huang, Yi Cheng   +3 more
doaj   +1 more source

Research on Pilot Control Behavior in Helicopter Target Tracking Tasks

Nanjing Hangkong Hangtian Daxue Xuebao
During helicopter operations for target tracking tasks， pilots perceive the current flight state through visual and motion cues， thereby generating corresponding control behaviors.
HE Zhixin, WANG Luofeng, CHEN Renliang
doaj   +1 more source

Combined Machining of Ti-6Al-4V Alloy Using Electrochemical Milling and Electrochemical Grinding

International Journal of Electrochemical Science, 2019
Ti-6Al-4V is a typical difficult-to-cut material with which it is difficult to achieve a high processing efficiency and good surface quality simultaneously using a single processing method.
Gangqiang Liu, Hansong Li, Shen Niu, Xiaokang Yue, Ningsong Qu   +4 more
doaj   +1 more source

Safety during interhospital helicopter transfer of ventilated COVID-19 patients. No clinical relevant changes in vital signs including non-invasive cardiac output

Respiratory Research, 2022
Background During the COVID-19 pandemic in The Netherlands, critically ill ventilated COVID-19 patients were transferred not only between hospitals by ambulance but also by the Helicopter Emergency Medical Service (HEMS).
Cornelis Slagt, Eduard Johannes Spoelder, Marijn Cornelia Theresia Tacken, Maartje Frijlink, Sjoerd Servaas, Guus Leijte, Lucas Theodorus van Eijk, Geert Jan van Geffen   +7 more
doaj   +1 more source