工矿自动化

Research of Fuzzy Control Method for Multi-parameter in Dense-medium Separation Process

GUO Xi-jin, GAO Jing-wei, YUE Guang-li, REN Liang-cai

2012, 38(9): 1-4.

<Abstract>(56) <PDF>(15)

Abstract:
In order to solve problem of poor control effect of artificial or PID method because of coupling of three parameters including suspension density, content of magnetic medium and liquid level in dense-medium separation process, the paper proposed a fuzzy control method for multi-parameter in dense-medium separation process on the basis of analysis of dense-medium separation process. The method uses two fuzzy controllers to control liquid level and suspension density separately, and calculates dividing water quantity and filling water quantity combing with slime content according to defuzzification results of output of the two fuzzy controllers, so as to control opening degrees of dividing box valve and water valve. The industrial testing result showed that the fuzzy control method has higher stability, faster responding and smaller overshoot than traditional PID control method.

Application of SVE Method in Purchase of Coal Mine Safety Equipment

MA Zhong-fei, XIE Hong-ling, YAO Shuai

2012, 38(9): 5-8.

<Abstract>(56) <PDF>(5)

Abstract:
For the problem that it is difficult to get optimum purchase solution of coal mine safety equipment by use of qualitative analysis method, a purchasing method of coal mine safety equipment based on safety value engineering was proposed, and decision-making process of the method was introduced taking purchase of gas pump stations of a coal mine enterprise for example. In the method, the weight of each function index of coal mine safety equipments is scored by 0~4 and each weight coefficient is calculated, then degree of each equipment satisfying the function index is scored by experts by use of ten-point system. Safety value coefficient of each equipment is calculated according to the scoring result and the weight coefficient, and the equipment with the maximum safety value coefficient is the optimum one. The method provides reference for coal mine enterprise in purchasing safety equipment scientifically.

Development of Full-automatic and Intelligent Scheduling and Loading System

GUO Xin, NING Jian-min

2012, 38(9): 9-12.

<Abstract>(62) <PDF>(8)

Abstract:
For problems of slow traffic, large labor strength and low efficiency of existing artificial scheduling, weighting and loading mode of mine vehicle, a full-automatic and intelligent scheduling and loading system was developed which was suitable for multi-point cross working. The whole design scheme of the system was given, key technologies were analyzed including vehicle identification of electronic toll collection, truck scale weighting and rapid quantitative loading, and design schemes of software and hardware of the system were described. The system realizes functions of the whole detection and management, intelligent scheduling, automatic loading and fast passage of transport vehicles of coal mine, and improves management efficiency of coal transport and loading.

Development of Control System for Rapid Quantitative Loading Station of Railway

WANG Jia

2012, 38(9): 12-15.

<Abstract>(261) <PDF>(10)

Abstract:
In order to solve problems of low speed and precision of traditional loading system of coal mine based on weigh bridge and control modes of manpower or single chip microcomputer, the paper introduced composition and process of a rapid quantitative loading station of railway, expounded configuration and control strategies of quantitative loading and automatic feeding of control system of the loading station, and tested the control system. By use of the control system, loading precision of the loading station is less than 0.1% for one carriage and the whole train, and loading time is less than 45 s for one carriage, which realizes quick and accurate loading.

Design of an Analysis and Detection Device for CAN Bus

WANG Xue-ming, XU Juan, WANG Qi-feng

2012, 38(9): 16-19.

<Abstract>(63) <PDF>(6)

Abstract:
For problems that normal CAN adapters used for monitoring CAN bus are expensive or cannot realize accurate and real-time monitoring, an analysis and detection device for CAN bus was designed by use of S3C6410 microprocessor, the whole structure was given and software and hardware design schemes of the device were introduced in details. The device is simple in operation and cheap, and can detect CAN bus equipments with different communication protocols and baud rates, which provides a fast and accurate solution of monitoring and fault detection of CAN bus.

Design of an Online Monitoring Device of Insulator Leakage Current of Medium Voltage Switchgear

KANG An-ming, SHEN Cheng-bing, LIU Qiang, ZENG Qing-jun

2012, 38(9): 19-22.

<Abstract>(55) <PDF>(5)

Abstract:
The paper introduced a design scheme of online monitoring device of insulator leakage current of medium voltage switchgear, gave whole design scheme of the device, introduced designs of amplifying circuit, filtering circuit, signal processing circuit and electromagnetic compatibility in details, and tested performances of the device by use of equivalent resistance-capacitance network under low voltage. When sine wave of 4 V is as input of the device, the output voltage is 2.2~3.8 V and the output current is 10~14 mA, which both meet design requirement and match pretty well in waveform. Besides，the output wave of the device is as the same as the measured wave under condition of certain phase shift, which shows that the device can realize function of online monitoring of insulator leakage current of medium voltage switchgear.

Design of a Novel Phase-sensitive Protector

LI Si-guang

2012, 38(9): 23-26.

<Abstract>(34) <PDF>(5)

Abstract:
For problem of low measuring sensitivity of existing phase-sensitive protectors used in low-middle voltage network caused by simple wave logic processing circuit, the paper proposed a design scheme of a novel phase-sensitive protector, and introduced working principle and designs of software and hardware of the protector in details. The protector uses an integrated measuring chip of power-energy parameters named CS5463 to read power factor directly for correct and reliable measurement. The experimental result showed that the protector can act reliably at the short-current moment in 80 ms and the action time of starting and over-loading is more than 8 s, which all meet design requirements.

Design of Intrinsically Safe Electrical System of Coal Mine Underground and Its Technology Development

ZHANG Gang

2012, 38(9): 26-34.

<Abstract>(53) <PDF>(7)

Abstract:
There is no standard for intrinsically safe electrical system of coal mine underground internally, and technique rules for I type intrinsically safe system are uncompleted in the new IEC 60079-25. The paper gave the concept of intrinsically safe electrical system and analyzed particularity of explosive environment of coal mine underground. For intrinsically safe electrical system whose whole or some parts are needed to reach protection level of I type EPL Ma or EPL Mb and explosion-proof type is intrinsic safety type “i” when used in explosive environment of coal mine underground, it expounded keys of system structure design and explosion-proof parameter evaluation and proposed some practicable methods. It also proposed fault analysis methods for system equipments and cable. Finally, it analyzed current status and development trend of intrinsic safety technology internally and overseas.

Optimization Method of Coal Sample in Ash Prediction Model Based on Near Infrared Spectroscopy

ZHAO Kai, LEI Meng

2012, 38(9): 35-38.

<Abstract>(41) <PDF>(9)

Abstract:
According to the unique problem of sample data in ash prediction model based on near infrared spectroscopy, an optimization method was proposed. Principal component analysis method is used for eliminating abnormal samples in coal sample set and extracting feature information of coal spectrum. A double-level clustering method is presented which integrates self-organize map neural network and fuzzy C-means clustering algorithm. The method classifies original sample set into 5 subsets and filtered dispute points. At last, prediction sub-models of coal ash are built for each subset based on GA-BP neural network to analyze testing samples of each subsets separately. The experimental results showed that the optimization method based on principal component analysis and the double-level clustering method can check and remove abnormal and suspicious samples exactly, compress sample data effectively, and improve learning precision and calculating speed of sub-models dramatically. The optimization method was a new effective method for development and application of near infrared spectroscopy in coal quality analysis.

Optimization Method of Coal Sample in Ash Prediction Model Based on Near Infrared Spectroscopy

ZHAO Kai, LEI Meng

2012, 38(9): 39-42.

<Abstract>(24) <PDF>(6)

Abstract:
According to the unique problem of sample data in ash prediction model based on near infrared spectroscopy, an optimization method was proposed. Principal component analysis method is used for eliminating abnormal samples in coal sample set and extracting feature information of coal spectrum. A double-level clustering method is presented which integrates self-organize map neural network and fuzzy C-means clustering algorithm. The method classifies original sample set into 5 subsets and filtered dispute points. At last, prediction sub-models of coal ash are built for each subset based on GA-BP neural network to analyze testing samples of each subsets separately. The experimental results showed that the optimization method based on principal component analysis and the double-level clustering method can check and remove abnormal and suspicious samples exactly, compress sample data effectively, and improve learning precision and calculating speed of sub-models dramatically. The optimization method was a new effective method for development and application of near infrared spectroscopy in coal quality analysis.

Modeling Simulation of Variable Frequency Transformer and Its Analysis

YANG Wen-gang, HE Cheng, WANG Fu-liang

2012, 38(9): 43-46.

<Abstract>(52) <PDF>(4)

Abstract:
Connecting two asynchronous power networks by use of high voltage DC method has problems of harmonic interference, commutation failure, difficult implement of smooth power regulation and so on at present. The paper introduced basic structure and principle of variable frequency transformer, researched mathematic model and control model of the variable frequency transformer, and gave mathematic formula of transmission power of the variable frequency transformer and driving torque generated by DC driving motor. Then it built simulation model of the variable frequency transformer by use of PSCAD software and did simulation research. The simulation result showed that the variable frequency transformer can connect two asynchronous power networks and realize smooth bidirectional power transmission with quick response. Meanwhile, controlling speed of DC driving motor by control speed controller can make speed of rotate transformer constant, so as to compensate frequency difference of the two power networks and keep system balanced.

Application of Improved Grey GM(1, m) Model in Fault Prediction of Transformer

LI Ping, HU Xin-ming, CHEN Guo-ping, LI Jian-hong, LUO Piao-yang

2012, 38(9): 47-51.

<Abstract>(68) <PDF>(12)

Abstract:
In order to solve problem of big error in predicting data sequence with fluctuation while using grey model to predict transformer fault, an improvement scheme of gray GM(1, m) predicting model was proposed. In the scheme, original data sequence is processed for better exponential rule to meet smoothness requirement of the predicting model, and the processed data sequence is analyzed by grey relational degree method to get relationship between variables. Background value of the predicting model is optimized and used for establishing the model, and equal-dimension new-information model is used to predict data. The improved GM(1, m) model was used to predict volume fraction of seven kinds of characteristic gases in some transformer oil and both average differences and posteriori relative error of predicted data were smaller than the ones of GM(1, 1) model and traditional GM(1, m) model, which showed the improved grey GM(1, m) has better prediction accuracy.

Sample Time Staggered One-cycle Control Strategy of Three-phase H-bridge Cascaded Inverter

FU Lan-fang, SUN He-xu, DONG Yan

2012, 38(9): 51-54.

<Abstract>(46) <PDF>(3)

Abstract:
An one-cycle control strategy was proposed for three-phase H-bridge cascaded inverter. The formula of switch duty ratio of each inverter unit was derived. It was pointed out that the average value of the switch variables in each switching cycle can be made equal or proportional to the control reference by controlling the switch duty ratio. In order to increase level number of output voltage of the cascaded inverter, a scheme was proposed of applying sample time staggered technique in the one-cycle control strategy of cascaded inverter, namely staggering the sampling time of each inverter unit. The simulation result verified fesibility of the sample time staggered one-cycle control strategy applied in three-phase H-bridge cascaded inverter, and the strategy can make output voltage of the inverter have small harmonic content with quick response and strong robustness.

Forecasting of Short-term Power Load Based on Improved PSO Algorithm and LS-SVM

PAN Lei, LI Li-juan, DING Ting-ting, LIU Dui

2012, 38(9): 55-59.

<Abstract>(51) <PDF>(3)

Abstract:
For problems of small samples, nonlinear, high dimensions and the local minimum of electric power load, a modeling method based on the least square support vector machine was proposed to forecast short-term power load by taking historical load, temperature and humidity data as inputs. For parameter selection problem of the least square support vector machine in modeling, an improved particle swarm optimization algorithm was used to optimize two parameters of penalty factor and kernel function of the least square support vector machine model, which guides initial population selection and avoids premature convergence of the particle according to diverse information of population. The simulation results showed that the method based on the improved particle swarm optimization algorithm and the least square support vector machine model has higher accuracy for predicting short-term load in comparison with method of the least square support vector machine model and method of the particle swarm optimization algorithm and the least square support vector machine model.

Internal Condensation Mechanism of Explosion-proof Water-cooling Frequency Converter and Its Experimental Research

GAO Gui-jun, KOU Zi-ming, ZHANG Jun, WU Huai-liang

2012, 38(9): 59-62.

<Abstract>(23) <PDF>(4)

Abstract:
Damp atmosphere in explosion-proof enclosure of explosion-proof water-cooling frequency converter could lead to condensation during hot and cold variation, worse still, the condensed water may cause short circuit and destroy the converter. The condensation mechanism was qualitatively analyzed, and the relationship model was established about air temperature, air humidity and dew-point temperature, which was applied to determine whether there was condensation in the cavity. The correctness of the relationship model was verified by simulation test. The influence of flow and temperature of cooling water on condensation was analyzed, and a conclusion was gotten that the bigger difference between atmosphere temperature and dew-point temperature, the more serious condensation. It was pointed out that condensation in the explosion-proof enclosure can be controlled by means of cooling or heating.

Application Research of Static Var Generator in Wind Power System

WANG Gang, ZHAO Li-jun, LI Jie, YU Ya-bing

2012, 38(9): 63-66.

<Abstract>(48) <PDF>(4)

Abstract:
The paper analyzed and compared dynamic response time and harmonic characteristics of thyristor controlled reactor type static var compensator and static var generator, and got a conclusion that static var generator has quicker dynamic response speed and lower harmonic content. It did simulation research of static var generator applied in wind power system at normally running time and three-phase grounding short-current fault time separately. The simulation results showed that static var generator can reduce transmission line loss and restrain voltage fluctuation and flicker of the coupling when wind power system runs normally and enhance low voltage ride through ability when short-current fault happens. It also simulated three-phase grounding short-current fault by cutting off 330 kV PT air switch of terminal board of static var generator in a wind power system, and got a result that the static var generator can achieve the maximum capacitive reactive output in a short time so as to improve stability of power grid.

Induction Motor Speed Control Based on Inverse System Theory and Sliding Mode Method

NIU Chao, ZHU Zhen-wei, CAO Ling-zhi

2012, 38(9): 67-70.

<Abstract>(49) <PDF>(3)

Abstract:
For the problem that parameter uncertainty was usually neglected when inverse system theory was used in speed regulation system of induction motor, on the basis of non-linear model of induction motor, a pseudo-linear control system model of induction motor with uncertain rotor resistance and load was established by use of inverse system theory. A dithering-prevented and adaptive sliding mode variable-structure control method was proposed which was realized by use of variable exponential reaching law, and the control method was used in the pseudo-linear control system of induction motor. The simulation result showed that the control method can restrain uncertainty of system parameters and improve system stability and control accuracy.

Fire Pre-warning Algorithm of Belt Conveyor Based on Neural Network

FAN Rong, HOU Yuan-bin, ZHANG Dai, LIU Hai-yang

2012, 38(9): 70-74.

<Abstract>(36) <PDF>(4)

Abstract:
In order to solve the problem of high alarming error rate of traditional fire pre-warning algorithms of belt conveyor which alarm according to single characteristic signal, a fire pre-warning algorithm of belt conveyor was proposed which combines the traditional fire alarming algorithms with neural network. The individual characteristic variables extracted by the traditional algorithms are used as inputs of neural network, and the neural network is trained by use of sample data measured in laboratory. The output of the neural network is the final output of the fire pre-warning algorithm. The experimental result showed that the algorithm can effectively identify fire pre-alarming status of the sample data with low error rate.

Research of Integrated Congestion Control Mechanism

LAI Cheng-yu

2012, 38(9): 75-78.

<Abstract>(49) <PDF>(3)

Abstract:
In order to solve the problem that classifying mechanism of SFB congestion control algorithm for wireless sensor network could be influenced to cause transmission performance degradation of TCP flow under large network flow, the paper introduced algorithm implementation of an integrated congestion control mechanism, and did simulation research of performance of the mechanism by use of NS-2 platform. The mechanism solves congestion by establishing a new path to distributing data packets. When the new path is not established successfully, the mechanism uses fair aggregate algorithm to limit sending rate of source node proportionably so as to ensure each source node to send data fairly. For light congestion, the mechanism uses an energy-saving algorithm, namely setting a threshold value of congestion time and starting the new path searching mechanism when congestion time is over the threshold value. The simulation result showed that the mechanism can reduce packet loss rate, relieve congestion effectively, and send importance data according to data weight.

Design of Wireless Strain Sensor with Low Power Consumptio

LIN Fu-yan, FU Chao-ying

2012, 38(9): 79-82.

<Abstract>(62) <PDF>(7)

Abstract:
A design scheme of wireless strain sensor with low power consumption was proposed, which takes MSP430F149 as main controller, nRF24L01 as wireless transmission chip and AD627 as preamplifier. Whole structure of the sensor was given and design methods of software and hardware of data acquisition and sending subsystem of the sensor were introduced in details. Power consumption of the sensor was analyzed and tested and the formula of power consumption was gotten. The calculated average current consumption of the sensor is 32 μA, which is lower than consumption of existing wireless strain sensors. The testing result is the same as the theoretical analysis result, and life-span of the battery is over 70 h.

Construction Conception of Intelligent Safety Analysis Platform of Shenhua Ningxia Coal Industry Group

ZHANG Jie

2012, 38(9): 83-86.

<Abstract>(60) <PDF>(4)

Abstract:
Construction conception of intelligent safety analysis platform of Shenhua Ningxia Coal Industry Group was proposed combining with practice of digital mine of the group. The construction target of the platform was pointed out, namely complete sensing, reliable transmission, data integration, intelligent analysis and scientific decision for data of safe production and safety management. Five-layer framework of the platform was introduced and the research contents were expounded. At last, technique route and functions of the platform were given and it was pointed out that the construction of the platform would realize complete management and control of human, equipment, environment and management and improve safety management level of the group.

Probe on Problems of Combined Overvoltage Protector in Lightning Protectio

YI Xiao-fei, KANG Xiang, TENG Jin-zuo, LI Shan-shan

2012, 38(9): 87-90.

<Abstract>(62) <PDF>(3)

Abstract:
The paper analyzed accidents in application of combined overvoltage protector in a substation in Yangquan mining area of Shanxi province and a pumped storage power station in Hubei province. It introduced principle and working characteristics of combined overvoltage protector, discussed problems of combined overvoltage protector, and pointed out that the structure of upper and lower ZnO elements of combined overvoltage protector could lead combined overvoltage protector no action at acting moment and accidents because of its own damage when lightning overvoltage happens. It also proposed points for attention in application of combined overvoltage protector, namely combined overvoltage protector cannot take the place of important lightning protection device and be used for lightning protection for important device.

Application Idea of Information Integration System with Multi-network in Coal Mine

TIAN Da-bing

2012, 38(9): 91-93.

<Abstract>(41) <PDF>(5)

Abstract:
For problems of independence and incorrect data assessment of monitoring systems of coal mine, the paper proposed a scheme of information integration system with multi-network of coal mine, gave structure and working principle, discussed key technologies, and imagined application of the system in coal mine. The system can integrate personnel location system, wireless communication system, environment monitoring system, video monitoring system, locomotive management system, etc., which is important for safety production and management of coal mine.

Design of Automatic Sign-in System for Dispatch Room Staff of Coal Mine

YUAN Xiao-ping, CHEN Xi-mei, ZHANG Ming-tao, YAO Wan-hua

2012, 38(9): 94-97.

<Abstract>(56) <PDF>(3)

Abstract:
For the problem of attendance information inaccuracy of regular attendance methods in coal mine like card punching method, an automatic sign-in system for dispatch room staff of coal mine was designed by use of face recognition technology, and the whole design scheme and face recognition algorithm of the system were introduced. The system firstly collects and pre-processes the face image, then detects face by use of Adaboost algorithm, and lastly recognizes the detected face through POEM + block PCA algorithm and nearest neighbor classifier. The system realizes functions of automatic sigh-in and attendance record of dispatch room staff of coal mine, which provides basis information for staff appraisal.

Mobile Digital Office Platform of Mine Based on REST Architecture

LAN Wei, DI Ming, WANG Feng

2012, 38(9): 97-100.

<Abstract>(33) <PDF>(3)

Abstract:
The concept of mine abstract resource layer was proposed for the first time based on resource-oriented idea and REST architecture. Function, document, interface and work flow of each heterogeneous network are abstracted as metadata of abstract resource which are marked by standard URI in the mine abstract resource layer, and the metadata are analyzed and processed in decision layer or intelligent analysis layer for correspond operation and analysis results. A design scheme of mobile digital office platform of mine based on REST architecture was proposed and implementing method was introduced that quickly integrated multi heterogeneous networks at a mobile terminal through an example of establishment of mobile office platform of Shenmu Zhangjiamao Coal Mining Co., Ltd.. The application showed that the mobile office platform runs stably with smooth operation, which improves working flexibility and efficiency greatly.

Design of Distributed Structure of Transportation Signal System for Mine Rubber-tyred Locomotive

ZHAO Li-chang

2012, 38(9): 101-103.

<Abstract>(46) <PDF>(4)

Abstract:
The paper analyzed structure design of transportation signal system for mine rubber-tyred locomotive and pointed out that distributed structure should be used for higher reliability and real-time performance. It introduced structure of distributed control system and proposed taking CAN bus as main transmission method after comparing RS485 with CAN bus. It also introduced the distributed structure and working flow of transportation signal system for mine rubber-tyred locomotive. The application showed that the transportation signal system for mine rubber-tyred locomotive based on distributed structure has higher reliability and real-time performance than the system based on traditional master-slave structure.

Application of AC Frequency-conversion Feedback Loading Technology in Reducer with High Power of Coal Mine

LI Sheng-ju

2012, 38(9): 104-106.

<Abstract>(41) <PDF>(4)

Abstract:
Potential quality problems of standby reducer used in coal mine cannot be found because there is no loading test mean for high power reducer and only no-load test method. The paper introduced loading technologies used in mine machine field and analyzed advantages of AC frequency-conversion feedback loading technology. Then it described composition and working principle of an AC frequency-conversion feedback loading test system and gave main indexes of the system. The system can test working performances of the reducer with high power of coal mine under loading status, which has high testing efficiency and precision and perfect energy-saving effect.

Design of Automatic Control Center of Chemical Mine

YANG Xiao-yong, TAN Jun, LI Xian-ju

2012, 38(9): 107-109.

<Abstract>(50) <PDF>(4)

Abstract:
The paper expounded main functions of automatic control center of chemical mine, introduced design of physical platform of the automatic control center including software and hardware of control systems and industrial television, and discussed forms of management-control integration in the automatic control center. It finally proposed points for attention about designing the automatic control center, namely model selection of UPS and anti-interference measures of control systems and industrial television system. The application showed that the automatic control center can realize functions of remote monitoring and control of production equipments and telemetry of safety monitoring meters, and greatly reduce labor intensity of managers and workers.

Design of a Crossing Alarming System

WU Chang-dong

2012, 38(9): 110-112.

<Abstract>(29) <PDF>(3)

Abstract:
For improving security of traffic and pedestrian, the paper introduced a design scheme of crossing alarming system, gave overall structure, selection of single chip microcomputer, sensor detecting circuit, active shield driving circuit, signal processing circuit and software design method of the system. The system can alarm after detecting train signal and display the train rate and approaching direction in order to alert pedestrians. The testing result showed the system can alarm for 1 min accurately when the train is less than 1 km away from crossing with high anti-interference ability and stability.

Design of Communication Card Based on HART Protocol

TONG Shi-hua

2012, 38(9): 112-115.

<Abstract>(54) <PDF>(4)

Abstract:
A design scheme of communication card based on HART protocol was proposed for traditional meters without remote communication function, and circuit design of the communication card was introduced in details. A HART communication system was established by use of the communication card and tested on NCS4000 configuration software platform. The testing result showed that the communication card combined with a port card can reform a traditional meter into an intelligent meter which has functions of remote communication and control.

Application of Visualized and Normally Closed Automatic Anti-slipping Device in Coal Mine

LI Guo-feng, ZHOU Xin-lei

2012, 38(9): 116-118.

<Abstract>(34) <PDF>(3)

Abstract:
For problems of large labor intensity and low automation degree of traditional safe protectors such as car stop rollers, car stops and so on in district rise and district dip of coal mine, the paper introduced composition, working principle, design scheme of PLC control system and selection of distance sensor and arrester of a visualized and normally closed automatic anti-slipping device. The device has been applied in mine winch conveying and gotten a good effect, which improves informatization and automation level of safety devices in inclined drift.

Application of Monitoring and Control System for Transportation of Rubber-tyred Locomotive in Coal Mine

TIAN Hua

2012, 38(9): 119-120.

<Abstract>(56) <PDF>(6)

Abstract:
The paper introduced arranging rules, establishing aim, system structure, main functions and application effect of a transportation monitoring and control system of underground rubber-tyred locomotive. The system solves safe transportation problem of underground rubber-tyred locomotive and provides an information platform for safety management of rubber-tyred locomotive

2012 Vol. 38, No. 9

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