工矿自动化

Research of movement speed control of scanning probe for draw shaft

HU Liangzhi, TU Fuquan, QIAN Feng, LIU Yanzhang, YE Yicheng

2014, 40(10): 1-4. doi: 10.13272/j.issn.1671-251x.2014.10.001

<Abstract>(69) <PDF>(4)

Abstract:
In order to solve image blurring, distortion and discontinuousness caused by unstable movement speed of scanning probe of panoramic scanner for draw shaft, structure of movement device of panoramic scanner was analyzed and relationship model between movement speed of scanning probe and angular speed of rotary drum was established, which was taken as theory evidence for setting angular speed of rotary drum. A closed-loop PI control method with anti-windup for integral was adopted to control movement speed of scanning probe. The experiment and application results show that the movement speed control strategy realizes movement with stable speed of scanning probe, and scanning images are clear and without distortion.

Design of embedded hardware platform of mine dynamic light-rail weighter system

ZHENG Chuanxing

2014, 40(10): 4-7. doi: 10.13272/j.issn.1671-251x.2014.10.002

<Abstract>(166) <PDF>(6)

Abstract:
In view of problems of complex structure and poor performance of existing hardware platform of front-end system for mine dynamic light-rail weighter system, an embedded hardware platform was designed. The hardware structure and working principles of the platform were described in details. The platform adopts multi-station mode and takes ARM microprocessor as core, so as to achieve functions of fast acquisition and processing of weighing data. The practical application shows that the platform has advantages of stable running performance and accurate measurement.

Study of new type of splitter applied in mine-used PON network protectio

SHI Faqiang, QIU Jiacong

2014, 40(10): 8-11. doi: 10.13272/j.issn.1671-251x.2014.10.003

<Abstract>(68) <PDF>(6)

Abstract:
In view of problems of high cost and low reliability of existing protection methods of mine PON network, the paper designed a new type of splitter composed of three beam splitters. The new splitter adds a beam splitter with splitting ratio of 50∶50 to traditional splitting, and uses its characteristics that insertion loss of up and down optical path is consistent to achieve protection of mine PON ring network by optical network units with single PON port. It avoids the use of redundant controllers and optical network units with dual active PON ports, and has high reliability and low cost.

Design of a kind of multiple parameters inspection instrument for gas drainage

XIE Guojun, GAO Fei, FANG Bin, WANG Shufeng, ZHU Chengjia

2014, 40(10): 11-14. doi: 10.13272/j.issn.1671-251x.2014.10.004

<Abstract>(67) <PDF>(4)

Abstract:
A kind of multiple parameters inspection instrument for gas drainage was designed, design and realizations of hardware and software of the instrument were introduced. The inspection instrument uses sensors to collect main performance parameters such as methane concentration, flow and pipe temperature, then the parameters are uploaded to upper computer through RS485 after AD converting, and user can visually analyze parameters of the gas drainage pipeline by the upper computer. The instrument has characteristics of high measurement accuracy and multiple acquisition channels, and improves efficiency of gas extraction and monitoring.

Research of energy efficiency model of mine rescue robot

TIAN Feng, FANG Haifeng, LI Yunwang

2014, 40(10): 15-18. doi: 10.13272/j.issn.1671-251x.2014.10.005

<Abstract>(42) <PDF>(4)

Abstract:
The paper theoretically analyzed energy transfer progress of robot, obtained efficiency equation of every link of energy transfer progress , and established comprehensive energy efficiency model of robot. It also got the relationship among the efficiency, current and battery capacity through Matlab simulation, drew following conclusions: battery capacity has little impact on energy efficiency of robots, output current determines energy efficiency of the robot, when the output current is 20 A, the robot has maximum energy efficiency. The conclusion could provide the theoretical basis for establishment of energy consumption model of robot, battery capacity determination and power management.

An algorithm of side information generation of coal mine underground video sequence based on full search

CHENG Deqiang, LIU Jie, GUO Zheng

2014, 40(10): 19-22. doi: 10.13272/j.issn.1671-251x.2014.10.006

<Abstract>(62) <PDF>(4)

Abstract:
In view of characteristics of low illumination and low definition of image in distributed coding of coal mine underground video, an algorithm of side information generation of coal mine underground video sequence based on full search was proposed. The algorithm expanded key frames which have been decoded, analyzed and judged the mean square error function value of corresponding pixel of block of each reference frame during full search by threshold. It reserved motion vector below the threshold, and improved quality of side information generation. The theoretical analysis and simulation results show that the algorithm can realize generation of high-quality side information of coal mine underground video sequence, and provides foundation for distributed coding widely used in coal mine underground video surveillance and communication.

Research of multiplicative noise reduction method for acoustic emission signal

MA Xiaoli, LIU Yancong, LI Chengkai, WANG Wenchao

2014, 40(10): 22-24. doi: 10.13272/j.issn.1671-251x.2014.10.007

<Abstract>(96) <PDF>(5)

Abstract:
Based on the features of acoustic emission signal, the paper researched noise reduction methods of adaptive filters and wavelet decomposition fit acoustic emission signal with multiplicative noise. It compared simulation results of noise reduction of the two methods. The simulation results show that noise reduction method of the adaptive filters is more suitable for noise reduction for the acoustic emission with multiplicative noise.

Application of energy difference spectrum of singular value in signal noise reductio

ZHANG Wenbi

2014, 40(10): 25-28. doi: 10.13272/j.issn.1671-251x.2014.10.008

<Abstract>(133) <PDF>(5)

Abstract:
In view of problem that the order of effective rank of matrix reconstruction is difficult to determine in singular value decomposition for noise reduction, a novel signal noise reduction method based on energy difference spectrum of singular value was proposed in order to improve signal to noise ratio of practical sample signal. According to the energy difference between useful signal and noise, the energy difference spectrum of singular value was constructed. The maximum peak point of energy difference spectrum curve was taken as valid order of the reconstructed signal, so as to realize separation between useful signal and noise, and the order of noise reduction of singular value was determined reasonably, integrity of the useful signal was retained and large signal-to-noise ratio was get, it's very important for signal feature extraction and analysis in next step. The results of simulation and example analysis show the effectiveness of the proposed method.

Inertial navigation positioning method of shearer based on Kalman filtering algorithm

ZHAO Jing

2014, 40(10): 29-32. doi: 10.13272/j.issn.1671-251x.2014.10.009

<Abstract>(102) <PDF>(2)

Abstract:
In view of problems of big error, low accuracy of existed positioning method of shearer, an inertial navigation positioning method of the shearer based on Kalman filtering algorithm was proposed. The method combines inertial navigation positioning results of the shearer with ideal track of the shearer set by central computer of control system of fully mechanized working face, then uses Kalman filtering to obtain the optimal estimation of the shearer position, so as to get final positioning result. The simulation results show that the method can avoid inertial navigation positioning error accumulated over time with high positioning accuracy.

Analysis of influence factors of polarization spectrum method on state detection of transformer oil-paper insulatio

TAO Fengyuan, ZHANG Dong, DONG Xinsheng, WANG Shirong

2014, 40(10): 33-36. doi: 10.13272/j.issn.1671-251x.2014.10.010

<Abstract>(43) <PDF>(2)

Abstract:
Application principle of polarization spectrum method based on recovery voltage method was introduced which was used in state detection of transformer oil-paper insulation, and a viewpoint was pointed out that main time constant of polarization spectrum curve was an important factor for judging state of transformer oil-paper insulation. Influence of charging voltage, residual charge and temperature on measurement result of polarization spectrum curve was analyzed separately with conclusions that charging voltage only influenced the maximal value of recovery voltage but did not influence main time constant of polarization spectrum curve, and residual charge and temperature would influence the main time constant. Matters needed attention were proposed that transformer should be fully discharged firstly, charging voltage should be as high as possible in range of 0-2 000 V and environmental temperature should be stable during actual application of polarization spectrum method based on recovery voltage method in state detection of transformer oil-paper insulation.

Prediction of field intensity in mine tunnel based on LS-SVM

WANG Anyi, GUO Shiku

2014, 40(10): 36-40. doi: 10.13272/j.issn.1671-251x.2014.10.011

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

Abstract:
For problem of low accuracy of current prediction of field intensity in mine tunnel, a prediction model based on the least squares support vector machine method was proposed to predict the field intensity in mine tunnel by taking measured data of a tunnel as training sample. Influence of training set construction and parameters selection on prediction effect were analyzed in details. The simulation results show that the LS-SVM prediction model has higher prediction accuracy than dual-slope model and logarithmic correction model.

Comparison of two solution algorithms of selected harmonics elimination pulse width modulation with multi-band for multi-level inverter

PAN Hongying, LI Song

2014, 40(10): 41-47. doi: 10.13272/j.issn.1671-251x.2014.10.012

<Abstract>(24) <PDF>(3)

Abstract:
For lack of research of nonlinear and linear solution algorithms of selected harmonics elimination pulse width modulation used in the same level topology of inverter, a nonlinear solution equation based on homotopy algorithm and a linear solution model based on Walsh function were established for a cascade multilevel inverter. Under several topology conditions, trajectory, upper limit and harmonic elimination effect of switching angles solved by the two algorithms were compared, and setting of initial solution conditions of the two algorithms were analyzed based on multi-band modulation mode. Solving characteristics, advantages, disadvantages and applicability under different control conditions of homotopy algorithm and Walsh function were summarized. It was pointed out that applying the two algorithms in the same level topology of inverter could reduce solution amount and improve control flexibility.

Sensorless control of switched reluctance motor based on full-cycle inductance space vector

ZHANG Xulong, WANG Feng, CAO Yanjing, SHAO Xiaogen

2014, 40(10): 48-51. doi: 10.13272/j.issn.1671-251x.2014.10.013

<Abstract>(59) <PDF>(1)

Abstract:
In view of problems of less reliability and more complexity of switched reluctance motor caused by rotor position sensor, a sensorless control method of switched reluctance motor based on full-cycle inductance space vector was proposed. In the method, each phase is injected with drive pulse at starting stage of the motor, non-conducting phase is injected with driving pulse and conducting phase uses energy returnable current chop control at running stage of the motor, so as to identify full-cycle inductance by calculating current slope difference. Then, the rotor position is estimated through relationship between full-cycle inductance space vector and its angle. The simulation and experimental results show that the maximum estimation errors of the rotor position at starting and steady running stage of the motor are 0.8° and 0.5° respectively, which meet accuracy requirement of sensorless control of switched reluctance motor.

A switching method of winding series-parallel of high-performance permanent magnet synchronous motor and its simulation study

BAO Xiping, JI Zhi

2014, 40(10): 52-56. doi: 10.13272/j.issn.1671-251x.2014.10.014

<Abstract>(42) <PDF>(2)

Abstract:
In order to expand running speed scope of permanent magnet synchronous servo motor, a switching method of winding series-parallel was proposed in this paper, the implementation of the method was also described in details, and the static and dynamic simulation of the method was also realized. The simulation results show that switching method of winding series-parallel can greatly expand running speed scope of the permanent magnet synchronous servo motor on the premise of the motor at low speed and high speed performance, and can solve the contradiction about high torque at low speed and high speed large power of the same motor.

Research of partial discharge detection for XLPE cable

TANG Zhongyu, CHU Xin, HAN Gang, YU Yuese

2014, 40(10): 57-60. doi: 10.13272/j.issn.1671-251x.2014.10.015

<Abstract>(38) <PDF>(2)

Abstract:
In order to extract characteristics of partial discharge signals, the paper proposed an adaptive threshold algorithm for processing partial discharge data by using ensemble empirical mode decomposition method for analysis of XLPE cable partial discharge signals. Firstly, partial discharge signals containing noise are decomposed into a number of independent mode function components by ensemble empirical mode decomposition method, and then adaptive threshold processing and reconstruction of the resulting mode function component were carried out to suppress noise. The algorithm overcomes mode mixing problem of empirical mode decomposition method, and simulation and measuring data verify its correctness and feasibility.

Design of start-up power supply system of lithium-ion battery of mine-used explosion-proof diesel locomotive

XIAO Linjing, CHANG Long, ZHANG Ruixue, WENG Feng

2014, 40(10): 61-64. doi: 10.13272/j.issn.1671-251x.2014.10.016

<Abstract>(46) <PDF>(5)

Abstract:
In view of requirement of GB 3836.2-2010 that battery with precipitated combustible mixture cannot be used in flameproof shell, a start-up power supply system of lithium-ion battery of mine-used explosion-proof diesel locomotive was designed with serial lithium-ion batteries. Design requirements and structure of the system were analyzed, and design of battery management unit of the system was introduced in details. The battery management unit combines LTC6803 with microcontroller to realize voltage detection and equalization control of single battery, uses DS18B20 temperature sensor to collect temperature of single battery and employs double current hall sensors to collect start-up current and charging current of the batteries. The test results show that the system runs stably, and measuring errors of voltage and current are far less than specified value of coal mine safety standards.

Early warning system of shaft wall deformation based on optimization GM(1, 1)

QU Peng

2014, 40(10): 64-67. doi: 10.13272/j.issn.1671-251x.2014.10.017

<Abstract>(39) <PDF>(19)

Abstract:
In view of problems that existing monitoring and warning system of coal mine shaft wall deformation has single detecting method and has no on-line monitoring function, an early warning system of shaft wall deformation based on optimization GM(1, 1) was designed. The system uses stress, displacement and temperature sensor to collect deformation data of shaft compression section, adopts optimization GM(1, 1) model to realize analysis and fitting of the data, and uses industrial Ethernet to transmit the temperature and displacement data to the computer monitoring system, so as to realize real-time data display, analysis and early warning. The application results show that the system has stable performance, precise measurement and reliable early warning.

Design of real-time monitoring system of auxiliary transportation vehicle in coal mine

LIU Wentao

2014, 40(10): 68-71. doi: 10.13272/j.issn.1671-251x.2014.10.018

<Abstract>(50) <PDF>(8)

Abstract:
For problems of difficult dispatching management and slow response of after-sale service of auxiliary transportation vehicle in coal mine, a real-time monitoring system of auxiliary transportation vehicle in coal mine was designed. The system uses explosion-proof on-vehicle terminal to collect parameters of running state and location information of underground auxiliary transportation vehicle in real time. Monitoring center receives data through wireless communication link, then displays and analyzes the data, so as to realize dispatching management and after-sale service of the vehicle. The test results show that the system has stable operation and can realize real-time comprehensive monitoring of auxiliary transportation vehicle in coal mine.

Design of comprehensive running state evaluation system for equipment in coal preparation plant

ZHANG Haijun, HU Chenjun, FAN Na

2014, 40(10): 72-74. doi: 10.13272/j.issn.1671-251x.2014.10.019

<Abstract>(35) <PDF>(2)

Abstract:
For problem that it cannot real-timely judge running state of equipment in coal preparation plant by use of parameter threshold method, a comprehensive running state evaluation system for equipment in coal preparation plant was designed. The system selects evaluation indexes and describes state of the evaluation indexes, then establishes membership function and determines weight of each evaluation index, finally calculates running state value of equipment through fuzzy comprehensive evaluation, so as to predict development trend of running state of equipment according to the state value, and provide countermeasure support for maintenance work.

Testing method of performance of coal mine safety monitoring and control system based on LoadRunner

WANG Sheji, ZHANG Haimei

2014, 40(10): 75-77. doi: 10.13272/j.issn.1671-251x.2014.10.020

<Abstract>(42) <PDF>(2)

Abstract:
For problems that current testing methods of performance of coal mine safety monitoring and control system cannot meet testing requirements under conditions of large data and concurrent operation of multi-users, a testing method of performance of coal mine safety monitoring and control system was proposed based on automatic testing tool LoadRunner. Testing processes were introduced in details including testing planning, testing script creating, scenario designing, scenario running and monitoring and testing result analyzing combined with specific implementation of concurrency testing and stability testing. The method can improve efficiency and accuracy of testing.

Design of wireless monitoring system of shearer

WU Huailu, LI Zhenbi, ZHU Yankai, HUANG Da

2014, 40(10): 78-80. doi: 10.13272/j.issn.1671-251x.2014.10.021

<Abstract>(48) <PDF>(3)

Abstract:
In view of problems of complex wiring, aging wires and inability to extend function existed in underground wired monitoring system of shearer, a wireless monitoring system of shearer was designed by use of ZigBee technology, and software and hardware design schemes of wireless sensor node, router node and coordinator node were focused on. The system uses wireless sensor node to collect running status parameters of shearer. Router node receives and transmits the collected data to coordinator node for analysis and processing through ZigBee network. The coordinator node sends the processed data to upper computer through RS485 bus, so as to realize remote monitoring of running status of shearer.

Underground personnel positioning system based on ultra wideband technology

LIU Shulun, WANG Shuse

2014, 40(10): 81-83. doi: 10.13272/j.issn.1671-251x.2014.10.022

<Abstract>(67) <PDF>(5)

Abstract:
In view of problems of short transmission distance, poor anti-multipath effect and low positioning accuracy existed in current underground personnel positioning technologies, an underground personnel positioning system was proposed by use of ultra wideband positioning technology based on time difference of arrival. The system sends ranging signal through multiple positioning sensors, target node carried by underground personnel receives the signal and returns it back to the positioning sensors after processing, then main positioning sensor receives ranging information sent by the positioning sensors through WiFi network and uploads it to positioning server through wired Ethernet, so as to realize real-time positioning of underground personnel, which effectively improves accuracy of underground personnel positioning.

Monitoring system of mine hydrological information based on ZigBee

BO Yingqiang, OUYANG Mingsan, LI Yeliang, SHI Tailu, WANG Man, DENG Jinwei

2014, 40(10): 84-87. doi: 10.13272/j.issn.1671-251x.2014.10.023

<Abstract>(39) <PDF>(2)

Abstract:
In view of problems of large volume, high cost and inconvenient installation of existing monitoring system of mine hydrological information, the paper proposed a design scheme of monitoring system of mine hydrological information based on ZigBee. The system uses low-power chip CC2530 as transmitting and receiving equipment, and achieves ZigBee networking and application development by use of Z-stack protocol stack software. It uploads real-timely collected hydrological information to the host to achieve monitoring of underground hydrological information, which solves the cost and installation issues. Meanwhile system devices are safe and reliable with small volume and low power consumption.

Underground fingerprint module positioning algorithm based on WiFi

DONG Jianping, YANG Cheng, LU Xiaoli

2014, 40(10): 87-89. doi: 10.13272/j.issn.1671-251x.2014.10.024

<Abstract>(35) <PDF>(2)

Abstract:
In order to improve positioning accuracy of underground personnel, an underground fingerprint module positioning algorithm based on WiFi was proposed. The algorithm saves measured signal strength from sampling point and its location information to form fingerprint database. WiFi terminal compares real-timely measured signal strength from wireless access point with information in the fingerprint database by use of matching algorithm, and calculates location of terminal by use of Euclidean distance formula. The test results show that the algorithm can realize accurate underground positioning.

Research of construction method of geological spatial database for CO2-ECBM

ZHANG Yan, ZHANG Shaoliang, ZHANG Dongqing

2014, 40(10): 90-93. doi: 10.13272/j.issn.1671-251x.2014.10.025

<Abstract>(26) <PDF>(2)

Abstract:
In view of problems of management and analysis of data with multi-source, multi-scale and multi-type existed in implementation of CO2-ECBM coal bed methane development technology, a construction method of geological spatial database for CO2-ECBM based on GIS was proposed. Firstly, data is obtained through geological survey of area and mine and drilling industrial testing analysis according to demand of CO2-ECBM technology. Then, the data is refined, shared in spatial reference, classified and coded. Finally, the data is stored according to Geodatabase data model, so as to realize sharing, management and visualization and application analysis of the data, and provide decision support for implementation of CO2-ECBM technology.

Research of control method of reactive power optimization for power grid of domestic industrial and mine enterprises

ZHAO Chenyang, SONG Dunwen, WEN Boying

2014, 40(10): 93-97. doi: 10.13272/j.issn.1671-251x.2014.10.026

<Abstract>(37) <PDF>(2)

Abstract:
The paper summarized current status of development and research of power grid of domestic industrial and mine enterprises, analyzed various types of reactive power optimization equipments, optimization methods, commonly used mathematical models and algorithms; Taking a typical enterprise as case analysis, analyzed approach and steps of reactive power optimization using tabu search algorithm, and conducted benefit analysis; Finally, gave development recommendations for reactive power optimization of industrial and mine enterprises.

Cooling system of electromechanical chamber based on improved PID algorithm

LI Hao

2014, 40(10): 98-101. doi: 10.13272/j.issn.1671-251x.2014.10.027

<Abstract>(28) <PDF>(2)

Abstract:
In view of problem of high temperature thermal damage of electromechanical chamber of deep mining mines, the paper designed a set of cooling system for electromechanical chamber with low wind speed and humidity, which can realize automatic adjustment of cooling capacity. It introduced hardware design and PC software design of the system, and described dead zone incremental digital PID algorithm embedded in PLC in details. The application results show that the system can effectively reduce indoor temperature of electromechanical chamber, and achieves functions of automatic control of cooling capacity, ground monitoring, alarming and warning.

Improvement of magnetic barriers structure of permanent magnet synchronous motor based on ANSYS

QI Dexin, ZHANG Baogang, LI Dongxiao

2014, 40(10): 102-105. doi: 10.13272/j.issn.1671-251x.2014.10.028

<Abstract>(115) <PDF>(12)

Abstract:
Stiffness and strength simulation calculation for magnetic barriers of rotor punching of 200 kW permanent magnet synchronous motor were conducted by use of finite element software ANSYS Workbench, and initial design structure were improved according to the calculation results, that is, a set of magnetic barriers with 1.5 mm width are added in radial magnetic path of hybrid magnetic structure of rotor core, and fit tolerance between the rotor core and shaft is optimized. The simulation results show that the improved structure obviously improves stress distribution of magnetic barriers of the rotor punching and reliability of the permanent magnet synchronous motor. It provides design basis for rotor punching of permanent magnet synchronous motor.

A logic programming technology for mine-used water pump controller based on control sequence

LIU Huiju

2014, 40(10): 106-108. doi: 10.13272/j.issn.1671-251x.2014.10.029

<Abstract>(25) <PDF>(3)

Abstract:
A control process programming technology based on control sequence configuration was presented, the implementation methods of configuration, encoding and decoding of the technology were introduced in details. Applying the technique to mine-used water pump controller of monitoring system, user can efficiently configurate and maintain various control logic of controlled object through the configuration software and according to water pump control process and requirements in field, so as to realize complex functions such as linkage of multiple water pumps, unattended, a peak valley, and effectively improve usability and maintainability of the mine-used water pump controller.

Application of random access instruction strategy in electrotechnics course teaching

WU Yunxia, ZHAO Qingqing, SUN Guishuang

2014, 40(10): 109-111. doi: 10.13272/j.issn.1671-251x.2014.10.030

<Abstract>(57) <PDF>(3)

Abstract:
In order to solve problems of weak basis of student and less teaching hours but more teaching content in electrotechnics course teaching, random access instruction strategy based on cognitive flexibility theory was adopted in the electrotechnics course teaching. On the one hand, concept and related case are characterized with hypertext structure of multidimensional and nonlinear cross-shape, so as to raise multiple representations ability for cognition of student and enhance transfer and coverage of knowledge. On the other hand, mnemonic method which is applicable to low-level learning is attached to multi-knowledge representation, so as to form star-shape, which has strong adaptability for the electrotechnics course teaching at present stage.

2014 Vol. 40, No. 10

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