bluuebunny/crossref_metadata_2025 huggingface dataset:
System Design of Dynamic Weighing and Video Monitoring for Colliery Production
Authors: Zheng Chuan Xing , Chen Jian
Published: December 2012

A comprehensive colliery production monitoring system is discussed, which can dynamically weigh the tramcar and carry out video monitoring at the same time. This colliery production monitoring system consists of the front-end hardware platform and the back-end information management system. Both the front-end hardware platform and the back-end information management system are designed in detail here. The main functions of the information management system are put forward. This monitoring system can not only strengthen the supervision of production and effectively reduce accidents, but also prevent the tax evasion. This design has been used in China for 2 years with stable operation.
A Dissusion on “Tree Systematize” Safety Management in Mining
Authors: Ma Chuan Chuan , Jiang Fu Chuan , Zheng Kai Huan
Published: December 2012

Mining area still has safety problems after research the present situation of mining.This article discussed the importance of systematize of safety management researching. By setting up the model of tree, mine safety management researching analyses various elements about relationship and effect under affecting each other. This work is benefit for systematize safety management in mining.
Network Parallel Electrical Method for Dam Foundation in Coal Mining Subsidence Area Hazard Evaluation
Authors: Liu Xiang Hong , Zhang Ping Song , Sun Lin Hua , Chen Song
Published: December 2012

Thelarge-scale exploitation of coal resources, will cause large area ground subsidence, soil quality to destroy and civil building foundation engineering problems, give the people live and work in peace brings a harm. This article from the network parallel electrical fundamentals and application premise to proceed, with Xie pool mining subsidence area new Xie dam engineering geological background, site layout of the two line, a 128 electrode, analysis of the detection results, on the ground by means of artificial method, electric field distribution, can quickly determine the quality of dam foundation damage points, provide geological basis for its management.
Analysis on the Influence Factors of Gas Emission in Eastern 113 Working Face of Dashuitou Mine
Authors: Li Zuo Quan , Wei Yin Shang , Guo Liang Song
Published: December 2012

There are many factors that affect the gas emission in working face. To predict and prevent this kind of gas emission, the mainly sensitive factor should be filtered and detected from many influencing factors. Taken Dashuitou Mine for an example, the main influencing factor was analyzed by using Grey correlation theory, which was atmosphere pressure. Then, the relationship between atmosphere pressure and gas emission is studied with Statistics tools. It obtained some important conclusions, include the rule of Atmospheric pressure changes in working face during a day, rule of the gas underground changes in a day, rule of correlation statistical, concrete relation between atmospheric pressure and gas emission. It would be useful on disposing of gas emission risk.
Post-Accident Human Reliability Analysis and Control of Mine Hoisting System
Authors: Liu Zhao Xia , Chen Lian Jun
Published: December 2012

Using the method of THERPand HCR this paper studies post- accident human error events of mine hoisting system which reflects accident consequence seriousness and accident treatment urgency. It ascertains cognitive failure probability P1, non-response probability P2 and the failure probability P3, and quantities and appraises degree of human reliability. Finally this paper analyzes causes of hoisting accident human errors ,by which probability human error can be reduced to the lowest limit.
Study on the High Carbon Dioxide in Repeated Mining Coal Seam of Tangshan
Authors: Sun Zhong Qiang , Zhang Jin Feng , Zhou Kun
Published: December 2012

With the development of economic and the shortage of energy, repeated mining is an important measure. Based on the production characteristic of small coal in Tangshan, the situation and existing problems of small coal mining was Summarized; with years of practice in mine ventilation technology and teaching experience, a part of the mine gas level identification results were analyzed and discussed; the result is that the repeated mining of Tangshan was a low gas mine, but the carbon dioxide emission was too high; The results show that the reasons of high carbon dioxide emission, which were abandon coal spontaneous combustion and wooden support decayed and geological and mining technology. The measures of control high carbon dioxide are proposed. The study result is important to improve safety production in the repeated mining coal.
The Study on the Technical Efficiency of the Listed Coal Companies
Authors: Miao Jing Yi , Cai Cheng Wei
Published: December 2012

This paper analyses China's listed coal companies based on Tobit-DEA model. DEA model results show that these companies have low technical efficiency level, containing the high scale efficiency and low pure technical efficiency. Then dig the factors to the pure technical efficiency and scale efficiency with Tobit regression model, and the result shows the increasing of management fee rate and debt capital ratio of technical efficiency has some negative effects, and the increasing of sales rate, asset turnover and P/E ratio is beneficial to technical efficiency. Then analyzes the possible reasons for these results and gives suggestions.
Fluid-Solid Coupling Analysis the Plastic Damage of the Surrounding Rock under the Influence of Confined Water Pressure and Mining Disturbance
Authors: Zhao Chun Hu
Published: December 2012

In order to anlysis the rock deformation characteristics in influence of mining disturbances, water pressure and crustal stress, a multi-physics coupling model is created by Comsol4.2a in this paper. By debugging mining steps and water pressure, the model simulated rock stress and deformation characteristics.the results showed that: (1)the water pressure is fixed conditions, the plastic damage scope in stress concentration zone where was formed by mining disturbanceis were greater than the mining floor,and with an extension of the scope of mining, the scope of plastic failure zone in the rock surrounding which including the vertical and horizontal was increased; (2) Stope width is fixed conditions,with the water pressure increases, resulting in the surrounding rock mechanical strength decrease, and increase the scope of the plastic collapse and plastic damage within thefault zone intensified.
The Optimized Design and Application of Intelligent SootBlowing System Based on Cleaning Coefficient and Neural Network
Authors: Cui Xiu Zheng , Zheng Ya Feng
Published: December 2012

Aiming at the disadvantage of power plant sootblowing system presently, this paper takes 330MW unit boiler as research object, firstly calculates boiler optimal sootblowing frequency and cleaning coefficient when the heat net income of heat absorbing surface is maximum. And then based on neural network software, both boiler convection heat absorbing surface and radiate heat absorbing surface are implemented real-time monitoring by using DCS data. At the same time, it compares monitoring cleaning coefficient with critical cleaning coefficient real-time, and the optimized system will alarm and instructs the operator to take sootblowing command when it requirements. The reality application performence in power plant has proved that this system have great advantage and practicability in energy-saving.
Maximum Hybrid Entropy Assessment of Equipment Failure Probability Caused by Voltage Sags
Authors: Zeng Zhuo Lin , Xiao Xian Yong , Wang Ying
Published: December 2012

In order to depict the complex uncertainty involved in evaluation of equipment sensitivity to voltage sags, the voltage tolerance level of sensitive equipment is characterized by interval data, a evaluation model is proposed to derive interval probabilities of equipment operation status. Hybrid entropy is used to measure the uncertainty of randomness and fuzziness. Then, the interval result is transformed into point-valued probability based on maximum hybrid entropy model. By the help of personal computers, the proposed model is finally verified in a test distribution system.
Research on Novel Uninterruptible Flexible Connector Device for Phase Separation in Electrified Railways
Authors: Tian Xu , Wei Ying Dong , Jiang Qi Rong
Published: December 2012

Loss and recovery of power supply to electrified locomotives when passing neutral section will caused over voltage and over current in locomotives, which greatly threatens the safety of electrified railways and passengers. A novel uninterruptible flexible connector device is proposed, which comprises of two breakers, back-to-back converters and two transformers. This device can realize flexible switch between voltages of two traction feeders using phase shift technology at variable frequency and make locomotives run pass neutral section at rated power. System configuration, working principle, system-level and device-level control of uninterruptible flexible connector device are introduced and their correctness and effectiveness are validated through simulation.
Theory Development and Substantiation of Service Properties of Auto Transport Vehicles Taking into Account Ability Rating and Climatic Factors
Authors: Salimov A.U. , Kulmukhamedov D.R.
Published: December 2012

In this work we studied the theory development and substantiation of service properties of auto transport vehicles taking into account ability rating and climatic factors.
Efficient Gross Vehicle Weight Selection in Hot and Dry Climate Conditions
Authors: Kulmukhamedov D.R.
Published: December 2012

In this work we studied the efficient gross vehicle weight selection in hot and dry climate conditions.
Discussion on Geological Experiment Technology in Geological Work
Authors: Ren Jia Guo , Wu Qian Qian
Published: December 2012

This essay puts silicate rocks test as example on the basic of the analysis of new technology and method of geological experiment. This essay analyses the experimental principal and process of silicate rock’s total iron content, and it based on geology experimental operation process. The essay tries to probe into silicate rock’s mineral chemical composition, rock structure and tectonics through the research of the iron content and other chemical components of silicate rocks. Furthermore, this essay also estimates the optional mineral’s component content of sandstone ore, and then evaluates mining products and industrial and economic value. It is very important to guide the development of the mine.
Application of New Flotation Machine on Phosphate Flotation
Authors: Cao Qin Bo , Wen Shu Ming , Li Chen Xiu , Bai Shao Jun , Liu Dan
Published: December 2012

Phosphate is a typical oxide ore characterizing that generating abundant froth during flotation. In this research a new flotation machine was employed in the flotation of phosphate. Comparing to regular flotation machine, in the reverse flotation of dolomite the recovery and grade of MgO has no significance improvement. While, in the case of reverse flotation of silicon dioxide, the new flotation machine has significance advantage. In 5 minutes of flotation time, the yield of froth is 20.66% with new machine, which equals to yield using regular machine under 8 minutes. The flotation time has been shorten by new machine. In addition, the recovery of silicon dioxide improved by 6% and the grade of silicon dioxide in phosphate concentrate decreased by 1.3% comparing the regular flotation machine. The results demonstrate that new flotation machine is more suitable and efficient for phosphate flotation
Hydrocarbon Origin and Accumulation Model of Putaohua Reservoir in Southern Daqing Placanticline Area
Authors: Wang Na , Lu Shuang Fang , Xiao Dian Shi
Published: December 2012

There are great oil and gas exploration prospect in south of Daqing Placanticline, with unclear understanding of source rock and accumulation model, the progress of oil exploration is restricted. To definite the source of oil and gas, according to chromatography data and analysis data, combined with potential of hydrocarbon generation and expulsion, oil-gas migration pathway, the hydrocarbon migration and accumulation model is proposed. It can be concluded that the oil from Putaohua reservoir in the south of Daqing Placanticline area mainly come from K2qn1 source rock locally, while the hydrocarbon sources of K2qn1 in the east and west of the depression makes small contribution to the research area. Migrate in source area is the main hydrocarbon migration and accumulation mode. Re-define the oil source of Putaohua reservoir can help enhance the cognition of the hydrocarbon accumulation condition and accumulation model, in order to direct the research for the accumulation and distribution principle of oil and gas exploration and favorable area prediction in the future.
Research on Variance Principle of Critical Producing Pressure Drop of Horizontal Well in Gas Reservoir with Bottom Water
Authors: Wu Ke Liu , Li Xiang Fang , Gou Xiao Ting
Published: December 2012

According to material balance principle, gas/water bearing height in gas reservoir with bottom water could be deduced. Additionally, sweep efficiency could be approximately determined, then based on the equivalent flowing resistance method and critical vertical velocity of bottom water drive, computational model of Critical Producing Pressure Drop during the development of gas reservoir with bottom water could be derived. Therefore, the variance principle of Critical Producing Pressure Drop of horizontal well can be expressed quantitatively, and this paper also analyzes that it is influenced by the ratio of vertical permeability to horizontal permeability, the difference between water and gas density, the ratio of water viscosity to gas viscosity and height for bottom water coning. The results could provide guidelines for the determination of reasonable producing pressure drop and producing rate of horizontal well in gas reservoir with bottom water.
Numerical Analysis of Pressure Gradient along Casing in Helical Turbulent Flow of Power Law Fluid in Eccentric Annulus
Authors: Li Zheng , Zhu Hong Wu , Fan Xiao Li , Hao Jian Sheng , Kong Xiang Ling
Published: December 2012

With the use of casing running tool (CRT), casing can be rotated and reciprocated at the same time with circulation of drilling fluid. Thus the flow in well bore was eccentric annular helical. Pressure exerted on casing was important for casing buckling analysis. A numerical model of eccentric annular helical flow of power law fluid was built in this paper. The relationship between average pressure gradient on pipe and some influence factors (pipe axial velocity, rotating angular velocity, drilling fluid circulation velocity, and axial coordination) was analyzed. Results showed that average pressure gradient caused by shear stress was only affected by average annular flow velocity, and it didn’t change along pipe length. Effect of rotating angular velocity on average pressure gradient on pipe was very small and could be negligible. A fitting function between average pressure gradient and average annular flow velocity was obtained in this end.
A Coupled Well Bore-Reservoir Production Investigation for Fractured Horizontal Wells
Authors: Zeng Fan Hui , Guo Jian Chun
Published: December 2012

Considering the reservoir seepage, borehole wall inflow, fracture and perforation flow’s process and mutual influence, an unsteady state computation model of fractured horizontal well coupling with reservoir was established based on the source function and superposition principle. Calculation results showed that compared to the production only from the hydraulic fractures, the difference of that both from fractures and perforations was great early and decreased slowly later. Take the perforation production for example, because of mutual interference and well bore flow friction, different location perforations with different output and the central-perforation production was lower than that of the outer-position.
Pressure Transient Modeling of Fractured Horizontal Wells in the Closed Tight Gas Reservoir
Authors: Xu Meng Ya , Liao Xin Wei , Zhao Xiao Liang
Published: December 2012

Fractured horizontal well is the important means for the development of tight gas reservoirs. Based on the geologic characteristics of the tight gas reservoir, a pressure transient model for fractured horizontal wells is established by the Green functions and Newman product principle. The model considers the seepage resistances and the inferences from fractures each other. Practical application presents the pressure changes and flow rate distribution of fractures at non-steady state and quasi-steady state, and the suggestions for field operation are given as well.
Study on Liquid Pipeline Water Hammer and Protective Device with Gas Concentration
Authors: Yong Qi Wei , Jiang Ming , Tang Yan
Published: December 2012

When pressure is low enough in pipeline the transported liquid vaporizes, and air can be let into the pipeline for various of reasons. After the pipeline is shut down, the air/vapor will gather and cavitation occurs. The existence of cavity in liquid pipeline is harmful when restarting the pipeline because the downstream equipments may not work properly. When the cavity collapse, the unsteady flow pattern in pipeline may be intensified due to the sudden increase of pressure and temperature, which may cause serious accidents. Analysis and calculation for the hydraulic status in gas concentrated liquid pipeline are presented in this paper using the rigid liquid column theory. A new type of protective device which automatically let in and release gas is designed by the author. The device is awarded the national patent of utility model.
Analysis on Migration Patterns and the Distribution of Oil-Gas Controlling Factors of Yushulin Area
Authors: Zhang Lei , Yang Qian , Zhang Xue Juan , Yang Zhi Ru
Published: December 2012

In order to ascertain the oil and gas migration pattern and its effect on gas/oil distribution of Yushulin area of Sanzhao depression in Northern Songliao Basin, this paper makes a comprehensive analysis of the oil source condition, the source-reservoir-seal assemblage relationship, the oil and gas migration pathway and patterns in Putaohua and Fuyang oil reservoir, summarizes the oil and gas migration patterns of Yushulin area, and analyses different oil and gas migration pattern influence on oil/gas distribution in Yushulin area combined with structural history, hydrocarbon generation and expulsion history, sedimentary microfacies research. The results show that there are mainly four types of oil and gas migration patterns in Yushulin area: indigenous – downward type - vertical migration pattern, indigenous - normal type - vertical migration pattern, proximal - lateral migration pattern and proximal – “U” type - complex migration pattern.
Investigation of Pipe Separation Technology in the Oilfield
Authors: Zhong Xing Fu , Wu Ying Xiang , Li Song Mei , Wei Peng Ju
Published: December 2012

Crude oil separating is an important technological process in the petroleum industry. Pipe separation technology (PST) is a new kind of separating method in oil-water-gas separation. To compare with conventional gravity separators, the new separator based on PST is low weight, low cost, efficient and convenient to maintain. This paper introduces this new compact separator, technological process and performance test. The test results show that the compact separator has good separating effect. When the water-cut inlet is from 50% to 60%, and the mixture flow rate is from 40 t/hr to 100 t/hr, the water-cut in oil outlet is less than 5%, and the oil-cut in water is less than 100 mg/l.
Study on Methods and Application of Energy and Mineral Resources Assessment Based on GIS
Authors: Tian Li Hui , Bai Guo Feng
Published: December 2012

The research of resources potential assessment methods is of important significance for improving economic benefits of mineral exploration. Aiming at the GIS-based assessment approach for mineral resources, the following are analyzed: Introduces superiority and feasibility of resources assessment using GIS, summarizes thinking way and work flow of the GIS-based mineral resources potential assessment, and taking coal resources utilization survey as an example, shows the practical applications of the evaluation of mineral resources using GIS. The results show that GIS-based assessment approach for mineral resources can realize quantitative identification and extraction from mineralization information using a variety of digitized geological information, and finally define locations, reserves and its quality of mineral resources.
Risk Ranking and Well Control Measures of Drilling Blowout in Xinjiang Oilfield
Authors: Du Gang , Ren Mei Peng , Yu Yang Fei , Li Xiang Fang , Zhang Ya Qi , Chen Xiao Liang , Xu Min , Zhang Xiao Lin
Published: December 2012

In order to reduce the chance of wellflow and prevent well blowout accident that gets out of control in Xinjiang oilfield, considering the statistical data of the factors that influence the drilling blowout, a model of evaluating drilling blowout risk to Xinjiang oilfield drilling and geological environment based on fuzzy mathematics is established. The drilling blowout risk of each oilfield area in Xinjiang oilfield area has been ranked, and the result indicates that both the nanyuan piedmont tectonic exploratory development area and the kelameili gas field are the highest drilling blowout risk areas. This paper suggests that the well control ranking management should be implemented in the Xinjiang Oilfield. Various well control measures should be made according to different drilling blowout risk, and the risk ranking of drilling blowout should be included in well control design.
Features on Pressure Drop and Methods to Evaluation Reserves of Commingled Unconsolidated Sand Reservoir
Authors: Zeng Qing Heng , Pang Jin , Yu Xi Nan , Liu Hong , Zeng Qing Ping
Published: December 2012

The static test data of past years the Sebei gas field are classified. The reason why the pressure drop-down curve are straight, or ascends or curves downward are analyzed with the characteristic of water influx, reperforating, transfer layers, sand burial, sand control, layers and wells interference of the typical wells. Then, two revised material balance models based on the deviation of pressure drop curve are introduced to calculate the dynamic reserve of this gas field with different pressure drop curves. It was proved that the method is an effective approach to evaluate precisely dynamic reserves of gas wells.
Petroleum Geologic Elements and Petroleum Systems in the Northern Apennines Basin
Authors: Hu Hai Yan , Lu Song , Xiao Hang Zhou
Published: December 2012

The Northern Apennines lies in the northern Italian Peninsula. The basin has the formation of Mesozoic-Cenozoic depocentries. The source rock is Emma limestone and Late Triassic source rock, which generated at the depth of 5-7 km. The reservoir included the Upper Cretaceous-Eocene Scaglia Formation and Liassic Noriglio Limestone. The seal included Scaglia Cinerea Formation, Cerro Marls Formation and unconformity upper marls. The petroleum systems are The Emma Petroleum System and Marnoso Petroleum System.
The Parameters Optimization that Based on the Finite Element Simulation of Hydraulic Injection Radial Drilling Technology
Authors: Wu Peng
Published: December 2012

Using the technology of hydraulic injection radial drilling can effectively solve the problem of low permeability oilfield development. Aiming at the the problem that reducing the rock fragmentation efficiency because of the recoil force in the process of the construction of hydraulic injection radial drilling, study the velocity distribution under different diameter, calculate the recoil force, rock breaking force and propelling force, and optimize the process parameters of hydraulic injection radial drilling technology by using the numerical simulation method.
The Geometry Research to Oil Tank’s Container Table with Changed Position
Authors: Si Shu Hong , Jiang Yan Mei
Published: December 2012

Aimed problem A of CUMCM in 2010,use geometry method to study height and volume relation in oil tank with changed position. Get function , which was proved to be correct and reliable with numerical method.
A New Unsteady-State Model for Calculating Oil-Water Relative Permeability of Low-Permeability/Ultra-Low Permeability Reservoirs
Authors: Yang Yue , Li Xiang Fang , Wu Ke Liu , Lin Meng Lu , Shi Jun Tai
Published: December 2012

Oil and water relative permeabilities are main coefficients in describing the fluid flow in porous media; however, oil and water relative permeability for low - ultra low perm oil reservoir can not be obtained from present correlations. Based on the characteristics of oil and water flow in porous media, the model for calculating the oil and water relative permeability of low and ultra-low perm oil reservoirs, which considering effects of threshold pressure gradient and capillary pressure, has been established. Through conducting the non-steady oil and water relative permeability experiments, oil and water relative permeability curves influenced by different factors have been calculated. Results show that: the threshold pressure gradient more prominently affects the oil and water relative permeability; capillary pressure cannot influence the water relative permeability but only the oil relative permeability. Considering effects of threshold pressure gradient and capillary pressure yields the best development result, and more accordant with the flow process of oil and water in low – ultra low perm oil reservoirs.
A New Resistivity Logging Method in Production Well
Authors: Ren Zhi Ping , Dang Rui Rong
Published: December 2012

This paper presents a new method for resistivity logging in production well. Based on electromagnetic theory, an electromagnetic response model is established for multi-cylindrical-layer, and the general expressions for through casing electromagnetic logging are deduced. We further calculate and simulate the effects of casing permeability on electromagnetic response and demonstrate the necessity of casing magnetization. Finally, the effectiveness of casing magnetization is validated by the magnetization experiment. The result shows signal penetration capability is significantly enhanced after casing magnetization. It demonstrates that casing magnetization is an effective method for resistivity logging in production well.
Research of Optical Fiber Fluid Flow Monitoring System Using Flow-Induced Pipe Vibration in the Oil Production
Authors: Shang Ying , Liu Xiao Hui , Wang Chang , Sun Bao Quan , Li Gan , Zhao Wen An , Zhang Guo Yu , Lv Jing Sheng , Zhao Wei Song
Published: December 2012

In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed, then the fixed relationship between standard deviation of pipe wall’s vibration induced by fully developed turbulence and mean flow rate is determined.The advantage of this method is applicable to small flow measurement with non-intrusively.
Finite Element Analysis of the Pillar of Serf-Motion Assistanced Powered Support Equipment for Tunneling Machine Based on ANSYS
Authors: Luan Li Jun , Ma Mu Jia , Gu Xin Yue , Qi Jian Feng , Xu Hai Long , Yao Li Ze
Published: December 2012

Serf-motion Assistanced Powered Support Equipment for Tunneling Machine is a new underground temporary support equipment .It's using with tunneling machine, whose main aim is to supply temporary support for the heading face, so ensures continuous working of tunneling machine，To ensure continuous operation of the boring machine, To ensure Mechanized operations of the temporary support of machine digging tunnel. Establish the pillar model by using PRO /E, then Import into ANSYS. Doing The stress analysis for the pillar of Serf-motion Assistanced Powered Support Equipment for Tunneling Machine，and then it could verify that Equipment analysis is correct by ANSYS .
Transient Dynamics Analysis of Hammer Rod Impact Based on ANSYS
Authors: Wang Jing Jing , Cui Xu Hong , Xu Wen Xin , Xie Miao , Meng Jun
Published: December 2012

Regarding the liquid-air hammer rod as the research object, the equivalent stress contour of the hammer rod has been obtained through transient dynamics simulation analysis of the hammer rod impact process by using finite element method. This paper has studied node rate response in different positions of the hammer rod to provide evidence for structure design of this kind of impact members.
Optimal Operational Planning of Utility Systems of Petrochemical Industry
Authors: Dai Wen Zhi , Liu Yang , Yang Xin Le
Published: December 2012

In order to meet varied requirements of gas and electricity in petrochemical enterprises, as well as reducing the operation cost and minimizing energy use, optimal operation of utility systems is a must. This paper establishes a model, which accounts for expenses of operation, maintenance, depreciation, and changeover cost. The model is validated against operative data. The results show optimal control strategy can be quickly obtained with improved PSO algorithm, accompanied with considerable cost saving.
Study on the New SVPWM Method for Three-Level Inverter of Brushless Doubly-Fed Machine
Authors: Liu Yan , Wang Xu , Xing Yan , Yang Dan
Published: December 2012

Brushless doubly-fed machine (BDFM) is a new type of AC induction motor.It has a good applicable prospect as the variable frequency motors or the variable speed constant frequency generators. Although the advantage of the three-level inverter, there are also some problems of neutral point voltage balance in this method such as the unbalance of neutral point voltage. And the traditional principle of Three-level inverter space vector pulse width modulation method is to estimate the sectors and calculating a lot of trigonometric functions. To solve these problems, a novel method for the virtual space vector concept in G-H coordinate system is presented in this paper. The method proposed can omit the judging process of the sectors, reduce the calculating burden, and maintain the balance of neutral-point voltage between capacitances within a certain index modulation. The results of simulation are given to validate the improved virtual space vector modulation.
Analysis of the Strength and Reliability of Hydraulic Support with Finite Element Method
Authors: Hu Deng Gao , Fan Xun
Published: December 2012

Hydraulic support is one of the most important equipments of coal mine exploration， this thesis is to analyse hydraulic support strength and reliability with finite element method. With the example of ZF8000/22/35 hydraulic support, this paper uses the HyperWorks finite element software to analyse the strength of the hydraulic support, and then, with the ANSYS, this paper calculates the reliability of the hydraulic support and figures out the sensitivity of the hydraulic support. Finally, some methods of reliability analysis with finite element method are summarized,these methods can give reference to the design of hydraulic support.
Floor Destruction Characteristic Study of Confined Water Effected by Mining Conditions
Authors: He Lu Bin , Hou Bo
Published: December 2012

Combined with Huaibei Mining Group 1028 Face of the Sun Tong mine site conditions,elasticity in the plane semi-infinite body established by the base plate of a mechanical model in the triangle strip load was used. The bottom plate of arbitrary point in the state of stress was analysised,and calculation formula of the horizontal stress,vertical stress and shear stress.was deduced.Based on elastic-plastic theory for solving the floor failure depth calculation of the floor limit conflict, the size of the water inrush combined with the Sun Tong mine 10 coal aquifer water inrush stress was analysised.The results of theoretical analysis of this article has some guidance, for the site management of the Sun Tong mine and has some reference for similar conditions.
Fault Diagnostic of Electro-Hydraulic Servo Valve
Authors: Pan Hai Yang , Liu Shu Nan , Yao Yong Ming , Jiang Yi Lin
Published: December 2012

In order to achieve the fault diagnostic and degradation assessment of the electro-hydraulic servo valve, a system of prognostic and health management based on the data-driven approach for the electro-hydraulic servo valve is presented. FMMEA performed in this study considered the degree of sub-components in electro-hydraulic servo valve. In order to use only five parameters to assess the cause of degradation, a physical model of the EH servo valve was built up to simulate the failure modes. The simulation results are very useful because the methods can be applied to assess the cause of degradation such as leakage, jamming, clogging and so on.
Simulation on Slinging and Reshipment System in Mine
Authors: Li Jun Xia , Jin Zhi Qiang , Wang Rong Quan , Kou Zi Ming
Published: December 2012

Aiming at the problenm of transportation to underground, and slinging, reshipment, assembly in underworkings for mining lage equipment , a set of slinging and reshipment system in the underground is developed. This system is a steel-frame structure consisted of multi-unit bridged structure junction,in which the double T-iron is taken as main load-bearing beam,and U-steel unit welded by back-to-back method is as a slanted prop triangle secondary beam.This system adoptes the three-dimensional modeling software Solidworks2007, and its COSMOS/Works modules, for the three-dimensional modeling and finite element analysis to this system. Through the finite element analysis, verified the correctness of the component design.
Study of a New High Frequency Moving Coil Linear Force Motor for Electro Hydraulic Servo Valve
Authors: Chen Jun Hui , Yang Feng Yu
Published: December 2012

There are some problems in moving coil linear motor for Electro-hydraulic servo valve, such as big weight, small electromagnetic force, long response time and small bandwidth. After simulation analysis on permanent magnet placement and permanent magnet magnetization direction, it is found that distribution of magnetic field lines is uneven, magnetic flux density is low, and magnetic field lines are not vertical with the coil current direction. To solve these problems, a new type of linear force motor with 5 rings stack Halbach permanent magnet array structure is put forward. Through using the new structure, the weight and volume of motor can be reduced, and the electromagnetic force can be increased. Simulation results show that for the new structure, under the coil displacement change, the output electromagnetic force changes little and can maintain good linearity. Using permanent magnet with same volume, the electromagnetic force produced by new force motor is 2.5 times as it is produced by current motor. If the electromagnetic forces produced by two structures are same, the step response time of new type can be decreased of 14.3%, and the bandwidth can be improved to 2 times.
Design of Remote Control Robot System
Authors: Huang You Jun , Li Ze Lun , Huang Zhi Cheng
Published: December 2012

A remote control robot system is designed, and the operator uses the remote control radio transmitter module for remote operation, and after the radio receiver module receiving the signal, it can control the movements of the robot by the PLC instructions. The software system used STEP 7 Micro WIN SP6 as development platform to prepare the software program, and designed the robot hardware with the use of electronic circuit knowledge. The results show that the remote robot system is successful, and it can complete a variety of actions according to requires.
Experimental Study on Mechanical Characteristics of the End Plates of Lebus Drum
Authors: Hu Yong , Tang Jing , Hu Ji Quan
Published: December 2012

The mechanical characteristics of the end plates of Lebus drum were investigated by an experimental approach. Strain-electricity method was used to test the stress of the end plates of the drum. Experimental results show that the equivalent stress exerted on the end plate is 3 time higher than the stress obtained by the conventional calculation method. The stress exerted on the end plate of one side of Lebus drum grows one time as the wire rope adds two layers according to the winding process and the increment of the stress becomes larger and larger with the wire rope layer number increasing. When the wire rope rise from the 10th layer to 11th layer, the increment of the stress in radial direction on the end plate of the entry side reaches up to 54.9 [Mpa].
Study on Life and Efficiency of Bearing of Planetary Gear Reducer of Less Tooth Difference with Biasing Crankshaft
Authors: Xu Qiang , Xu Qi Sheng , Xu Dao Yi
Published: December 2012

Transmission principle of a planetary gear reducer of less tooth difference with biasing crankshaft was analyzed. Through force analysis of crank tumbler bearing and crank block bearing, the mathematic model was deduced, and influence factor of forces was ascertained. The even absolute value of supporting force of crankshaft tumbler bearing and block bearing is taken as their equivalent load, the life and efficiency model of tumbler bearing was deduced, and their enhancement measure was put forwarded and tested and verified by example.
Design of a Welding Robot Based on Fischertechnik Combination Model Platform
Authors: Peng Hao , Huang Zhi Cheng
Published: December 2012

Based on Fischertechnik combination model platform, A type of welding robot is designed and developed. Firstly analyzed the overall structure of the robot to determine the driver program and drive programs, and then assembled and establishment the robot structure in accordance with the modular design finally studied the robot control system. This paper focuses on the hardware design of the robot and control system. Practice has proved that the teaching robot we designed has good promotion and application prospects in the field of teaching.
Simulation Experiment of Roll Bending Machine in Valveless Servo System
Authors: Cao Yang , Tian Xiao Yan , Wu Guo Qing , Li Qiao Mei , Wu Yan Hua
Published: December 2012

Valveless servo system is a new technology which is widely used in recent years. Compared to the traditional hydraulic system, valveless servo system has a lot of advantages such as high efficiency, less pollution and saving energy, which will be the main research direction of the hydraulic control in the future. Roll bending machine is a large industrial machine, but the efficiency of existing hydraulic system of roll bending machine is low and the cost of maintenance management is high. Applying valveless system on roll bending machine can overcome these defects. This paper made a study of the control strategies which were about valveless servo system on roll bending machine. And software MATLAB was used to do simulation experiment on valveless servo system. This paper summarized the steady-state error and dynamic characteristics according to output signals in different input signals.
Coordinate Analysis of the Characteristics of the New Servo Valve and its Work Condition
Authors: Liu Ting Ting , Wang Hui , Wang Geng
Published: December 2012

The paper gives an introduction of the structure and working principles of the new gap-type electro-hydraulic servo valve and advances the performance law of throttle by a comparative analysis of the performance of gap-type electro-hydraulic servo valve and the traditional rectangular orifice. In the meanwhile, combined with the introduction of the coordinate of working state, this paper aims to solve such complex problems as the design parameters of hydraulic components and provide a basis for the visual design of the performance of hydraulic components and cavity control parameters of servo valve and the main valve.
Stability of Velocity-Loop-Based Hydraulic Control Loading System
Authors: Qi Pan Guo , Zhao Li Wei , Cong Pei Chao , Wang Hui
Published: December 2012

A hydraulic Control Loading System (CLS) based on velocity-loop was developed and installed on our flight simulator earlier days, but the CLS cannot keep stable in some conditions. This problem is discussed in this paper. The mathematical model of velocity-loop-based CLS is firstly developed with the method of transfer function block diagram. Then, system’s stability conditions are put forward using Roth criterion based on the system model developed. At last, the experiments proves the stability
Research on Hydraulic Cylinder Fault Diagnosis System Based on ARM
Authors: Zhao Xiu Xu , Hu Zhe Min , Shang Yan Chen
Published: December 2012

Hydraulic cylinder is an important actuator in hydraulic system, affecting the system running correctly and effectively. It’s closed and difficult to observe the failure symptoms, and result the difficulties of fault diagnosis and elimination for hydraulic cylinder. In this paper, a fault detection instrument and system for hydraulic cylinder are developed to diagnose the fault mode through position and pressure signals and infer decision based on FMEA base.
Design and Simulation of an Energy-Saving Hydraulic Oil Production System
Authors: Song Jin Chun , Ren Guan Gan , Yang Lin
Published: December 2012

The study on an advanced equipment of a new pumping unit is presented to satisfy the mining technology demands of large load, long stroke and low pumping speed during petroleum exploitation process. The method of using a full hydraulic system drive rather than the traditional way is adopted to overcome the disadvantages in a traditional oil production equipment such as complex mechanical structure, large volume,many transmissions, low efficiency and high manufacturing cost. In addition, the hydraulic circuit which is made up of an accumulator, a hydraulic motor and two hydraulic pumps is used to realize power recovery for energy saving. The mechanical mathematical model and the hydraulic one of a novel hydraulic oil production mechanism were established and analyzed. Good results are eventually obtained. This equipment has been the national patent.
Dynamic Simulation Research on Three-Position Four-Way Reversing Valve
Authors: Li Yu Lan , An Xiang Bi , Zhu Dao Wei
Published: December 2012

The reversing valve is a vital servo component in the hydraulic system, which reversing the movement of the execute component by the movement of the valve core to change on-off of the hydraulic channels. The model for a three-position four-way electromagnetic reversing valve used in some hydraulic system was established based on AMESim. The simulation operation results showed that the model had realized the same function with that of the actual valve, and had been consistent with the actual one on dynamic characteristics. The established of the model and the dynamic simulation analysis laid foundation for the hydraulic system operation reliably and effectively.
Design and Theoretical Studies of Pulsatile Hydraulic Vertical Isolation Device
Authors: Zeng Hui , Zhao Jing Yi , Wang Kai
Published: December 2012

Vertical seism has the same damage to the structure as the horizontal earthquake did. But vertical seism has not been taken seriously as it should be because its acceleration is smaller than that of horizontal earthquake. This paper describes the characteristics of vertical seism and a kind of vertical isolation device is designed based on the application of pulsating hydraulic theory. Moreover, it also states theoretical analysis and experimental study about properties of the device.
Hydraulic Test Bench Design on Travel Drive System of Platform Lorry
Authors: Song En Zhe , Yin Mei Liang , Ji Chang Xi , Sun Jun , Yin Cheng Shun
Published: December 2012

In order to study the platform lorry’s travel and drive system, based on the prototype of real platform lorry，the system was properly simplified in engineering application under the circumstance of fully satisfication for control strategy. A method of test-bench contruction based on three variables of engine, pump and motor was provided, furthermore, detailed analysis and calculation for the selection and matching of system major parts was carried out, and the test-bench of the platform lorry’s travel and drive system was established. The test-bench mentioned above could also be used for the hydraulic system laboratory research of platform lorry or other similar models.
Design and Realization of Durability Test-Bed for New Developed Hydraulic Pump
Authors: Wang Cheng Long , Zeng Qing Liang , Liu Zhi Hai , Kang Hong Xi
Published: December 2012

In order to satisfy the practical requirement, Durability test-bed for new developed hydraulic pump is designed which mainly includes design of hydraulic systems, design of data acquisition and processing system and design of test bench and electronic control system. According to application, it shows that the Durability test-bed is effective for durability test of new developed hydraulic pump and it can help to improve the design of hydraulic pump
Effects of Water-Borne Polyurethane on Calcium Silicate Hydrate and Toughness of Properties of Cementitious Composites
Authors: Ding Bei , Zhang Xia , Zhou Dong Liang , Miao Chan Wen
Published: December 2012

A novel kind of block polymer with characteristics of rod-like chain conformations-water-borne polyurethane (PUA) was synthesized by incorporate polyacrylate (PA) into the PU chain to prepare an aqueous polyurethane-polyacrylate (PUA) hybrid emulsion with core-shell structure. The interactions between Water-borne PUA and C-S-H nanostructure, which include intercalation and the polymerization degree of C-S-H silicate chains, were studied by small angle X-ray diffraction spectra and 29Si NMR spectra, respectly. The influences of water-borne PUA on mechanical performance of C-S-H were investigated experimentally. The small XRD results show that no evidence is observed for any fundamental size change in the C-S-H particles that have been formed in the presence of polymer. The NMR results indicate that there is a significant increase in the Q2/Q1 ratio ranging from 0.5 for pure C-S-H to 2.2 for PUA-C-S-H, respectively. The degree of silicate polymerization increases from 3.0 for pure C-S-H to 6.4 for PUA-C-S-H by calculation. PUA had minimal harmful effect on the compressive strength whereas the flexural strength was increased by 23.2% with dosage of 0.5% and 23.3% with dosage of 1.0%, respectively.The fracture energy ratios of concrete with a dosage of PUA less than 1% are greatly improved more than double with the decreasing of concrete strength less than 10%. The water-borne PUA also enhances the impact resistance of concrete. The impact energy consumption of samples with PUA increase nearly three times more than reference samples, also better than samples with PP fiber.
Research on the Properties of Grind-Hardening and Abrasion of 42CrMo Steel in Agricultural Diesel Engine Crankshaft
Authors: Liu Ke Ming , Zhang Lian Yong , Ma Zhuang , Liu Bo
Published: December 2012

In order to improve the strength and wear-resistance of agricultural diesel engine crankshaft, the grinding-hardening experiment of crankshaft material 42CrMo steel was carried out on MM7132 surface grinder. Microstructure of the specimens was observed with SSX-550 scanning electron microscope (SEM) and the abrasion experiment was carried out on ML -100 abrasive wear testing machine. The results showed that the maximum mircrohardness of 42CrMo steel after grind hardening was 850HV and the maximum depth of grind hardening layer was 1.25mm. The hardened layer was fully occupied by lath martensite; a little of martensite and much tempered sorbite appeared in the transitional region. The wear-resistance of the specimens after grind hardening was improved by three times.