Results 11 to 20 of about 191,773 (209)

Dendrite Refinement and Improved Mechanical Properties of SiC/TiC/Al Hybrid Nanocomposites

Advances in Materials Science and Engineering, 2022
Hybrid nano-(SiCp + TiCp)/Al composites were fabricated by liquid ultrasonic assisted semisolid stirring processing. The eutectic silicon of Al matrix changes from acicular to fine granular with addition of nanoparticles and the dendrite size of primary ...
Hui Xie, Jinze Lv
doaj   +1 more source

Helicopter Mothers and Helicopter Fathers: Italian Adaptation and Validation of the Helicopter Parenting Instrument

, 2020
The aim of this study is to validate the Italian version of the Helicopter Parenting Instrument (HPI), a self-report instrument that evaluate adolescents’ and young adults’ perception of parenting behaviors. The term helicopter parenting describes a style of child-rearing characterized by parents who are over-involved in every aspect of their children ...
Pistella, J, Izzo, F, Isolani, S, Ioverno, S, Baiocco, R   +4 more
openaire   +4 more sources

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

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
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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
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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

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
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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

Neural Network Adaptive Attitude Control of Full-States Quad Tiltrotor UAV

Aerospace
The control stability and accuracy of quad tiltrotor UAVs is improved when encountering external disturbances during automatic flight by an active disturbance rejection control (ADRC) parameter self-tuning control strategy based on a radial basis ...
Jiong He, Binwu Ren, Yousong Xu, Qijun Zhao, Siliang Du, Bo Wang   +5 more
doaj   +1 more source