A5045112224- Welding Techniques and Residual Stresses
- Hydrogen embrittlement and corrosion behaviors in metals
- Fatigue and fracture mechanics
- Electrical Contact Performance and Analysis
- Microstructure and Mechanical Properties of Steels
- Railway Engineering and Dynamics
- Railway Systems and Energy Efficiency
- Laser Material Processing Techniques
- Advanced Welding Techniques Analysis
- Additive Manufacturing Materials and Processes
- Shape Memory Alloy Transformations
- Metal Alloys Wear and Properties
- Advanced Surface Polishing Techniques
- Mechanical stress and fatigue analysis
- Adhesion, Friction, and Surface Interactions
- High Entropy Alloys Studies
- Additive Manufacturing and 3D Printing Technologies
- Advanced Measurement and Detection Methods
- Power System Optimization and Stability
- Icing and De-icing Technologies
- Thermography and Photoacoustic Techniques
- Technology and Security Systems
- Surface Treatment and Residual Stress
- Phase Change Materials Research
- Erosion and Abrasive Machining
North China Electric Power University
2023
Tongji University
2023
Southwest Jiaotong University
2016-2022
Shenyang Aerospace University
2008-2020
University of Science and Technology Liaoning
2010-2020
Tianjin University of Technology
2018
Xi'an University of Architecture and Technology
2018
Huaiyin Institute of Technology
2010-2014
Beijing Institute of Aeronautical Materials
2007-2008
The pantograph installed on the train roof is responsible for collecting electrical energy via sliding contact with catenary constructed along railroad. To enhance carrying capacity of high-speed train, multiple pantographs are normally mounted EMU (Electrical Multiple Unit train) to interact simultaneously catenary. Especially in China, double pantographs-catenary interaction gradually becoming mainstream newly built network. biggest challenge double-pantograph operation deterioration...
The residual stress distribution of duplex stainless steel multi-pass weld joint and its formation mechanism still lacks systematic research. In this study, neutron diffraction electron backscatter were used to systematically investigate the through-thickness stresses. results show that both macroscopic plus elastic mismatch stresses decrease along direction maximum area is located near top surface. in austenitic phase are larger comparison those ferritic phase. addition, tensile compressive...
In modern electrified railway industries, the transmission quality of electric power from supply to locomotive is determined by dynamic performance catenary-pantograph interaction. The mathematical modelling a high-performance tool study behaviour system. order improve calculation efficiency, moving mesh method implemented with nonlinear finite element model catenary. contact wire re-meshed according point between pantograph and catenary in each simulation time step. Addressing unbalanced...
In an electrified railway system, the pantograph on train roof is used to collect electric current through a sliding contact with wire (CW) of catenary. The CW mounted laterally in zigzag relative track centerline help steady arm ensure symmetrical wear pantograph's strip, which beneficial slow process and extend service life. Under impact, around forms stress concentration has been recognized as vulnerable point catenary system. This article performed uniaxial tensile test high-cycle...
The electric shoegear-conductor rail system (the shoe-rail system) is one of the energy collection devices for metro vehicles. A good interaction performance between shoegear and conductor essential to ensure current quality operational safety. irregularities vehicle-track excitation (induced by track irregularities) are major disturbances interaction. Only vertical effect has been considered in previous studies, which cannot reproduce realistic behavior system. To address this deficiency,...
The catenary system is the only source of power for high-speed railways, which carries electric current to be collected by a pantograph mounted on train roof via sliding contact. height difference between contact wire and messenger at support called encumbrance catenary, normally restricted satisfy demand wind protection in an open environment reduction clearance tunnel. catenary's consequently decreases droppers' length affects interaction performance pantograph-catenary. This paper first...
The realization of 12mm thick laser-arc hybrid welding technology is the prerequisite for efficient production new high-speed train bogies. In this work, laser-leading welding, problem hump defects in root weld easy to occur. arc-leading mode chosen obtain welded joint high-strength bainitic steel with no hump, unfilled and porosity defects. Then microstructure distribution welds analyzed, which metal mainly composed acicular ferrite lath bainite heat affected zone concludes coarse-grained...
No-tillage seeding has become an important approach to improve crop productivity, which needs colters of high performance cut the root-stubble-soil composite. However, difficulty maize root-stubbles three-dimensional (3D) modeling hinders finite element (FE) simulation development efficiency such because root system complexity and opaque nature soil. Fortunately, non-destructive 3D geometric model root-stubble in-situ can be established via X-ray computed tomography (CT) following by a...
The microstructure and intergranular corrosion resistance of 6 mm thick Type 301L-MT stainless steel joints welded by laser-MAG (metal active gas) hybrid welding were investigated. Double loop electrochemical potentiokinetic reactivation measurement (DL-EPR) impedance spectroscopy (EIS) conducted to study the behavior (LMHW) in a slightly oxidative medium (a solution 0.5 mol/L H2SO4 + 0.01 mol/L KSCN). results show that weld metal mainly consists austenite δ-ferrite, while base (BM) heat...
Milling of Al 2 O 3 ceramic is affected by various factors. Combination laser milling parameters was optimized based on orthogonal experiment in this study. The affect degree the depth obtained range analysis ,based which process were and taken circular cavity using parameters. results indicated that sequence factors affecting power,scanning speed, overlap amount,defocused quantity successively. By parameters,milling 0.4mm for single layer experiment,and result satisfactory. roughness...
The influence of hafnium element's incorporation on a Cu– xHf–13.0Al–4.0Ni (wt-%) ( x = 0.5, 1.0 and 2.0) high-temperature shape memory alloy was investigated systematically. results show that the matrix alloys is 18R martensite, an orthorhombic-structured Cu 8 Hf 3 phase formed distributed at grain boundaries. size significantly reduced with increasing content. mechanical properties are improved by doping due to combination refinement strengthening, solid solution strengthening second...