A5100686760- Aluminum Alloy Microstructure Properties
- Aluminum Alloys Composites Properties
- Aerospace and Aviation Technology
- Adaptive Control of Nonlinear Systems
- Biofuel production and bioconversion
- Microstructure and mechanical properties
- Guidance and Control Systems
- Metallurgy and Material Science
- Microbial Metabolic Engineering and Bioproduction
- Catalysis for Biomass Conversion
- Advanced Power Amplifier Design
- Radio Frequency Integrated Circuit Design
- Magnesium Alloys: Properties and Applications
- Solidification and crystal growth phenomena
- Distributed Control Multi-Agent Systems
- Agricultural Engineering and Mechanization
- Power Systems and Renewable Energy
- Advanced Fiber Laser Technologies
- Real-time simulation and control systems
- Aerospace Engineering and Control Systems
- Metallurgy and Material Forming
- Conducting polymers and applications
- Smart Grid Energy Management
- Anaerobic Digestion and Biogas Production
- PAPR reduction in OFDM
Northwestern Polytechnical University
2010-2024
Xinjiang Academy of Agricultural and Reclamation Science
2023
China Academy of Space Technology
2021-2022
Shanghai Maritime University
2019
Shanghai Polytechnic University
2019
Northwest A&F University
2019
Beijing Forestry University
2016-2017
China National Health Development Research Center
2014
Beihang University
2014
Suzhou Vocational University
2013
Quad-Plane UAV(quadrotor fixed-wing hybrid vertical take-off and landing Unmanned Aerial Vehicle) is vulnerable to wind disturbance in quadrotor mode, the performance of electric system directly affects its rejection performance. To study optimize precisely efficiently, a dynamic simulation integrating high-precision submodels components required. However, there are few papers on this kind system. This paper proposed with both high computational efficiency precision, it can be used...
To investigate the longitudinal motion stability of aircraft maneuvers conveniently, a new analysis approach is presented in this paper. Based on describing aerodynamics at high angle-of-attack (α < 50°) by polynomials, union structure two-order differential equation suggested. By means nonlinear theory and method, analytical global bifurcation analyses polynomial systems are provided for study phenomena flight. Applying theories bifurcations, many kinds such as equilibrium, Hopf, homoclinic...
The nonlinear dynamic behaviors of the distributed feedback semiconductor laser (DFB-SLs) subject to dual-beam optical injection are experimentally investigated. results show that outputs a DFB-SL display much rich and more complex dynamical compared with single-beam injection. By fixing oscillated wavelengths two beams continuously changing strengths beams, output spectra power under different have been measured. On basis spectra, some typical states determined three cases categorized as...
Quadrotor fixed-wing hybrid vertical take-off and landing (VTOL) UAV, the so-called Quad-Plane, is susceptible to wind disturbance during VTOL mode, which reduces its stability limits application. In order dynamically analyze response characteristics effectively optimize rejection performance in a dynamic flight simulation system based on 6-DoF equations established, aerodynamic model of Quad-Plane established tunnel test, axial lateral forces moments rotor are obtained through CFD...
The Dendrite Coherency Point (DCP) of A357 alloy was determined after different melt treatments by double thermocouples, and the coherency solid fraction (fscoh) calculated thermal analysis. results dendrite properties show that fscoh values increase with increased cooling rate for alloy. For alloys, grain refined superheat treatment. point found to be dependent on not only morphology dendrites but also growth rate.
The early age hardening behavior in Al-Cu-Mg alloys with fixed Cu content (0.50 wt%) and varying amounts of Mg has been studied by hardness tests TEM observation. Two both exhibit the rapid phenomenon based on large solute-aggregates analysis. Ageing time stage Al-0.5Cu-1.99Mg is less than that Al-0.5Cu-1.48Mg alloys. For two alloys, ageing reduces artificial temperature increasing. depended composition temperature. Forming larger may give rise to hardening.
The competitive precipitation behavior between T 1 and σ phases in Al-Cu-Li alloy was studied by hardness test, XRD TEM observation. test results show that the changing curves are related to densities of vacancies dislocations, age hardening precipitates. give rise rapid hardening. indicates there exists an alternation increase peak value diffraction intensity ranged from 40 45° aged for various ageing time. About four sequences occur during alloy, including δ', θ, sequences. Competitive...
Grain structure and precipitates in squeeze casting Al-Li-Mg-Zr alloy for aircraft industry were investigated heat treated condition, using X-ray diffraction, optical microscopy transmission electron microscopy. An ultra fine grained sub-micrometer size was obtained, having nanograins it with polycrystalline diffraction rings that are different from the single-crystal patterns matrix. Ultra grain areas generally located on boundaries sub-grain boundaries. In addition, TEM observations...
Higher order modulation is widely used in modern Communication systems such as OFDM and CA which lead to high peak average power ratio (PAPR). It's crucial for radio frequency (RF) amplifiers (PAs) maintain efficiency not only at saturation, but also output back-off working condition. Sequential Power Amplifier (SPA) a technique proposed recent years reach these demands. Based on academic researches, the development of broadband high-efficiency SPA reviewed. Finally, developing trend presented.
Based on the characteristics of releasing loads for many times, attitude dynamics model MIRV has established by using Rodrigues representation, and we proposed a method indirect multi-model adaptive control. It was proved that controller designed can ensure control system globally uniformly bounded stable according to Lyapunov stability theory, effectiveness demonstrated numerical simulation results.
Controlled diffusion solidification (CDS) is a novel and simple process that enables the formation of non-dendritic microstructure primary Al phase through mixing two liquid alloys different composition temperature together. A quaternary alloy (Al-5.0Cu-0.35Mn-0.25Ti, wt.%), having similar chemical component with ZL205A, was fabricated using controlled method temperature. The liquids mostly affects cast structure especially phase. Results show CDS can reduce element segregation degree inside...