Results 21 to 30 of about 2,483 (186)

A Robust Control Method for the Trajectory Tracking of Hypersonic Unmanned Flight Vehicles Based on Model Predictive Control

Drones
Hypersonic unmanned flight vehicles have complex dynamic characteristics, such as nonlinearity, strong coupling, multiple constraints, and uncertainty.
Haixia Ding, Bowen Xu, Weiqi Yang, Yunfan Zhou, Xianyu Wu   +4 more
doaj   +1 more source

The Effect of Fuel Injection on the Combustion Characteristics of Gas-Solid Two-Phase Gas [PDF]

Hangkong bingqi
Fuel injection significantly affects the combustion characteristics of gas-solid two-phase gas in solid rocket scramjet. The effects of fuel equivalent ratio and fuel injection port arrangement on the combustion characteristics of gas-solid two-phase gas
Zhao Libei, Ma Likun, Xia Zhixun, Feng Yunchao, Chen Binbin, Liu Yandong
doaj   +1 more source

Study on Trajectory Optimization of Hypersonic Vehicle Based on Neural Network

Frontiers in Energy Research, 2022
For the horizontal take-off hypersonic cruise aircraft, research on the combined design method of multi-section was carried out, the main design parameters of different sections were analyzed, the parametric design model of the flight path was ...
Feichao Cai, Xing Huang
doaj   +1 more source

Unlocking Strength‐Toughness Dilemma in High‐Entropy Borides by Intragranular Microstructural Reconstruction

Advanced Science, EarlyView.
An extreme non‐equilibrium process combining heavy direct current sintering and TiSi2 addition is used to construct intragranular energy dissipation units within high‐entropy boride ceramics to overcome the strength‐toughness trade‐off. The resulting ceramic demonstrates attractive mechanical properties with a flexural strength of 887 MPa and a ...
Yingjun Liu, Yuhan Yao, Yufei Zu, Zhaofu Zhang, Yang Zhang, Hongfeng Dong, Nan Zhang, Wuhao Cao, Lehao Liu, Yuan Hu, Ruiheng An, Wenhu Li, Luyi Zhu, Taotao Ai   +13 more
wiley   +1 more source

Deep transfer learning for three-dimensional aerodynamic pressure prediction under data scarcity

Theoretical and Applied Mechanics Letters
Aerodynamic evaluation under multi-condition is indispensable for the design of aircraft, and the requirement for mass data still means a high cost. To address this problem, we propose a novel point-cloud multi-condition aerodynamics transfer learning ...
Hao Zhang, Yang Shen, Wei Huang, Zan Xie, Yao-Bin Niu   +4 more
doaj   +1 more source

Coupled heat transfer characteristics on gas-solid reacting interface in carbon-oxygen dissociating environment for spacecraft entry flow

Journal of Thermal Science and Technology, 2020
High-enthalpy dissociating aerodynamic environment during high-speed spacecraft entries brings new challenges to the prediction of heat transfer characteristics on the surface of thermal protection system.
Xiaofeng YANG, Yanxia DU, Shenshen LIU, Guangming XIAO, Yewei GUI, Wei LIU   +5 more
doaj   +1 more source

Assessment of Radiative Heating for Hypersonic Earth Reentry Using Nongray Step Models

Aerospace, 2022
Accurate prediction of the aerothermal environment is of great significance to space exploration and return missions. The canonical Fire II trajectory points are simulated to investigate the radiative transfer in the shock layer for Earth reentry at ...
Xinglian Yang, Jingying Wang, Yue Zhou, Ke Sun   +3 more
doaj   +1 more source

Chemically Gradient Ordered Nanodomains Enable Large Tensile Ductility in Gigapascal Lightweight Refractory High‐Entropy Alloys

Advanced Science, EarlyView.
A high‐strength lightweight refractory high‐entropy alloy achieves extraordinary ductility owing to the introduction of coherent chemically gradient ordered nanodomains (CGONs). The CGONs not only serve as effective barriers to dislocation motion (strengthening) but also significantly promote dislocation nucleation and multiplication (ductilizing) upon
Wei Zhang, Dingshun Yan, Yong Zhang, Zhiming Li   +3 more
wiley   +1 more source

Performance modeling of flame-assisted fuel cells based on a swirl burner

AIP Advances
Aiming at the problems of a narrow operating range and complex modeling of Flame-assisted Fuel Cells (FFCs), an FFC system based on a swirl burner is proposed, and neural network algorithms are used to construct the prediction model for the polarization ...
Yiming Liu, Jianguo Tan, Zihan Kuai, Dongdong Zhang, Yao Liu   +4 more
doaj   +1 more source

Development of Automated Processes for Three-Dimensional Numerical Simulation of Compressor Performance Characteristics

Applied Sciences
Compressor characteristic evaluation is a critical step in design and optimization. Corrected characteristic curves are typically derived via experimental testing or CFD computation which is typically executed through manual manipulation. For compressors
Junbing Liu, Xiaoqiang Fan, Xiao Tang
doaj   +1 more source