A5101660175- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies
- Industrial Technology and Control Systems
- Reliability and Maintenance Optimization
- Geotechnical Engineering and Underground Structures
- Advanced oxidation water treatment
- Advanced Sensor and Control Systems
- Machine Fault Diagnosis Techniques
- Civil and Geotechnical Engineering Research
- Environmental remediation with nanomaterials
- Mechanical stress and fatigue analysis
- Power System Reliability and Maintenance
- Evaluation and Optimization Models
- NMR spectroscopy and applications
- Geological Studies and Exploration
- Advanced Photocatalysis Techniques
- Gear and Bearing Dynamics Analysis
- Structural Engineering and Vibration Analysis
- Geoscience and Mining Technology
- Railway Engineering and Dynamics
- Advanced Welding Techniques Analysis
- Coal Properties and Utilization
- Flow Measurement and Analysis
- Fault Detection and Control Systems
- Mathematical Analysis and Transform Methods
Yangtze University
2006-2024
China National Petroleum Corporation (China)
2024
Southwest Petroleum University
2011-2024
Beijing Jiaotong University
2022
China Railway Group (China)
2021
Hebei Agricultural University
2021
Neijiang Normal University
2020
Southwest Jiaotong University
2014-2020
Xi'an University of Architecture and Technology
2019
Ankang University
2012
Actual condition-based maintenance for traction power supply equipment (TPSE) is almost based on completely observable state. However, it unpractical to accurately reveal the state due inescapably uncertainty of assessment. In order optimize TPSE, a model partially Markov decision process proposed in this paper. Firstly, degradation TPSE described by four-state process, and residence time its transition probability are obtained equaling fault times statistical period. Then, imperfect...
Abstract Conventional maintenance mode for the traction power supply system (TPSS) is to perform scheduled regular activities equipment, while such may result in undue tasks and low efficiency due different degradation processes of sorts equipment. To address this problem, paper introduces a preventive opportunistic (POM) method TPSS based on equipment reliability. Firstly, POM model established by considering reliability process Weibull distribution. Then, total outage time planned...
Abstract Qingcaosha Reservoir, based on coastal sand of Changxing Island at the Yangtze Estuary, is largest plain and reservoir storing fresh water home abroad, with full length 48 km. The dam foundation mainly filled arenaceous soil powdery sand, which owns large permeability poor seepage stability; body built by new way for filling blowing casting bags, also stability. Focusing three forms laying tubular bags sand-bags two typical section, article has completed indoor large-scale hydraulic...
Hybrid interferences of dynamic DC and AC could cause stronger direct corrosion effects to pipelines than either type alone posing greater potential safety threats. However, the detection separation hybrid faces challenges hindering development protection measures. Motivated by this, this paper proposes an adaptive method for on oil gas based multi-resolution fast Fourier transform (FFT) piecewise aggregation approximation (PAA). According characteristics frequency distributions...
Nickel-iron bimetallic catalysts (Ni-Fe/Al2O3) with activated alumina as the carrier were prepared by impregnation pyrolysis, and structure morphology of analyzed characterization means X-ray diffractometer (XRD), field emission scanning electron microscopy (FESEM), photoelectron spectroscopy (XPS). The Ni-Fe/Al2O3 used to catalyze sodium hypochlorite (NaClO) for oxidative degradation methylene blue (MB). effects dosage iron nitrate in preparation process catalyst dosage, effective chlorine...
摘要: 转向架作为动车组车辆的关键部件,担负着承载与走行等多种任务,传递不同形式的动态载荷,有必要对其疲劳问题进行研究。以某型城际车动车和拖车转向架构架为研究对象,在对构架疲劳关键点动应力进行线路实测基础上,依据速度、航向角以及部分线路参数,提取到直线、不同半径曲线、启动牵引、混合制动以及低速过站等不同工况下各测点的动应力数据,分析和比较各测点在不同运用条件下的疲劳损伤特点。通过时-频变换方法,得到不同速度下动车和拖车各主要测点动应力幅频特征,进而分析各测点动应力峰值频率所对应的系统固有频率和外界激励频率,探讨不同频率成分的动应力对各关键点损伤的贡献情况。研究发现,相同速度和曲线半径下,多数动车疲劳关键点的等效应力大于拖车。在车辆接近停止时,抗蛇行减振器座和横侧梁连接处的动应力会存在一个大幅值循环,这与车体惯性力对抗蛇行减振器的作用有关。中低速过道岔时,各测点的动应力变化范围均有一定程度的增大,以横侧梁连接处和抗蛇行减振器座处变化最为明显,其他疲劳关键位置的动应力变化相对较小。达到相同损伤占比时,绝大多数动车构架测点的动应力频带比同速度下拖车构架更宽。
In order to analyze the construction processing for No.1 shaft of Weihe Tunnel on Baoji-Lanzhou Passenger-dedicated Railway, a two-dimensional numerical model simulation was built with finite difference method. Mohr-Coulomb chosen as soil constitutive model. The result shows that maximum lateral displacement appears at upper part shaft, and is in effective constraint shaft’s bottom. After construction, uplift bottom center, while decreases from center its both sides. pressure stress turns up...
A simple and practical method of estimating reflectivity refractive-index modulation is reported when writing fiber Bragg grating (FBG) into silica core based on 800 nm femtosecond laser pulses a phase mask. By monitoring recording the variation output power, are estimated theoretically experimentally. The FBG approximate 96.4%, about 1.2×10-3. When used as linear cavity mirror, 15.5 W power obtained under an incident pump 51.6 W, corresponding to slop efficiency 37.9%. beam factor M2=1.4 at...
Aiming at the problem that relative important degree of indexes will change, when urban rail power supply equipment is in different running state, this paper proposes a comprehensive degradation assessment model. The model uses discrete indexes' historical data to describe importance each indexes, and calculates initial weights by mean variance method (MVM). When normal operation weight corrected current detection index, obtained. According principle "more value punishment", failure index...
The creep camber of box girders significantly lowers track regularity, making it very important to perform geometry precise adjustment or ballast tamping operations by maintenance machinery on girder sections at the right timing. appropriate operation should be conducted after reaches a stable state. To address this challenge, in study, power and frequency spectra were used identify typical section 32-m railway line based inspection data high-speed cars. Also, wavelet decomposition, moving...