2014 Vol. 40, No. 7

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Transceiver of underground location system based on visible light color division duplex
DENG Jianzhi, CHENG Xiaohui
2014, 40(7): 1-4. doi: 10.13272/j.issn.1671-251x.2014.07.001
<Abstract>(52) <PDF>(5)
Abstract:
Existing underground transceiver communication of wireless location system adopts radio wave, and its communication distance and quality are effected by small tunnels and rocks with complex composition. In view of the above problems, a transceiver of underground location system based on visible light color division duplex was designed. The transceiver adopts LED to transmit information and uses photodiode to receive light data, so as to realize wireless visible light communication. Color division duplex mode is used in uplink and downlink of the transceiver. The signals in two-direction are modulated in two visible light channels with different colors in order to send and receive data. The experiment results show that the transceiver has low power consumption, good anti-electromagnetic interference performance, stable reception and also can be used for lighting.
Design of mine signal transceiver based on WiFi technology
ZHAO Man, HOU Xiumei
2014, 40(7): 5-8. doi: 10.13272/j.issn.1671-251x.2014.07.002
<Abstract>(71) <PDF>(8)
Abstract:
In view of defaults of short transmission distance, high power consumption and poor anti-interference ability of existing underground wireless signal transceiver, the paper designed an mine signal transceiver based on WiFi technology by use of ARM9 embedded chip and WinCE operating system. The signal transceiver communicates with shearer monitoring module through Modbus protocol and receives running parameters of shearer through RS485 serial ports. Meanwhile, the signal transceiver connects to underground wireless access point based on TCP/IP protocol in WiFi network, and communicates with sever in monitoring center, so as to realize running state monitoring of the shearer. Application shows that the signal transceiver achieves high real-time transmission performance, low power consumption and strong anti-interference ability.
Design of microseism information collection system based on STM32F407
YU Fangfang, GUO Laigong, LI Liangguang
2014, 40(7): 9-12. doi: 10.13272/j.issn.1671-251x.2014.07.003
<Abstract>(78) <PDF>(6)
Abstract:
A microseism information collection system based on STM32F407 was designed in order to accurately collect and transmit microseism monitoring data and real-timely monitor case of coal mine rock burst. The system collects microseism signal by sensors and front-end acquisition and control module FPGA, and transmits the signal to master chip STM32F407, meanwhile, STM32F407 sends gain control signal and synchronization control signal to FPGA, so as to real-timely adjust circuit parameters for site needs. The processed microseism signal was transmitted to ground server by Ethernet, and the server can judge the source location according to analysis and display of the microseism signal. The experiment results show that the system has reliable and high performances, and can meet demands of real-time information collection and transmission.
Signal processing method for dynamic weighing based on wavelet transform
LIU Yafeng, NIU Yuguang, ZHANG Jianyong
2014, 40(7): 13-16. doi: 10.13272/j.issn.1671-251x.2014.07.004
<Abstract>(50) <PDF>(4)
Abstract:
In order to solve problems of abnormal weighing signal and inaccurate weighing caused by truck forced braking on dynamic truck scale, a signal restructuring algorithm of wavelet transform maxima was used to process weighing signal of truck forced braking. The weighing signal is decomposed layer by layer in various frequency and time domain firstly and gradual trend of weighing signals at different levels is obtained by calculating the maxima point under condition of stable frequency. Then the weighing signals at different levels are restructured into relative true value according to original discrete approximation coefficients, so as to get truck weighing information. The field testing shows that the error is less than 1% between weighing value of truck forced braking processed by the signal restructuring algorithm of wavelet transform maxima and normal weighing value.
Design of hardware of terminal of mine-used IP network broadcast
XU Wei
2014, 40(7): 16-18. doi: 10.13272/j.issn.1671-251x.2014.07.005
<Abstract>(72) <PDF>(5)
Abstract:
For problems of short transmission distance, low transmission rate and small capacity existed in current mine-used broadcast system, a design of hardware of terminal of mine-used IP network broadcast based on Ethernet was proposed. Selections of the main controller, voice codecs, Ethernet network interface and audio amplifier, and matters needed attention in their use were focused on. The test results show that the maximum undistorted output voltage of signal of the terminal reaches 5.5-6 V, output power reaches 4 W, and signal distortion is less than 5%, which is fully able to meet the requirements of coal broadcast.
Design of auxiliary parking device of mine-used trackless rubber-tyred vehicle
CHENG Liusheng, LYU Xiaoqiang, CHEN Ya, SHAN Chengwei, LIU Dong
2014, 40(7): 19-21. doi: 10.13272/j.issn.1671-251x.2014.07.006
<Abstract>(53) <PDF>(6)
Abstract:
In view of hidden security trouble in astern running for trackless rubber-tyred vehicle, an auxiliary parking device of mine-used trackless rubber-tyred vehicle was designed, and acquisition principle of signals of astern running distance, image, running direction of the vehicle and input signal of switchover of the device were introduced. The practical application result shows that the device has stable and reliable performance, and can effectively monitor 400-2 000 mm astern running distance and clearly display video image of astern running under low illumination environment, which solves security problem of astern running in unsighted area.
Construction of 3D coal seam model based on improved triangular prism element
ZHU Defu, XING Cu'en, QIAO Gangjie
2014, 40(7): 22-24. doi: 10.13272/j.issn.1671-251x.2014.07.007
<Abstract>(78) <PDF>(5)
Abstract:
Existing 3D modeling methods of coal seam use twice interpolation algorithms and traditional triangular prism to construct coal seam model, which lead to bigger error. Delaunay triangle subdivision algorithm and Kriging interpolation algorithm were adopted to establish 2D curved surface data model of coal seam according to drilling data of coal mine in a database, so as to form upper and lower surfaces of 3D coal seam model. An improved triangular prism element was taken as basic element to construct 3D coal seam model combined with 3D drilling model, so as to realize 3D visualization of coal seam and automatic calculation of coal reserve. According to original drilling data of a coal mine, 3D coal seam model in a working face was constructed by use of 3D modeling method of coal seam based on the improved triangular prism element and coal reserve was calculated with a more accurate result of 4.82% than traditional segment method.
Design of attitude sensing system of hoister container based on ADXL345
ZHANG Qunying
2014, 40(7): 25-28. doi: 10.13272/j.issn.1671-251x.2014.07.008
<Abstract>(53) <PDF>(6)
Abstract:
For real-time monitoring vertical posture of hoister containers, an attitude sensing system of hoister container based on ADXL345 was designed in order to ensure timely alarm when the hoister container is inclined. The system determines current attitude of hoister container by monitoring its inclination angle in perpendicular direction. The inclination angle is compared with alarm threshold, if it goes beyond alarm threshold, makes alarming. The alarming information can be uploaded to the hoister monitoring center via RS485, so as to achieve early warning operation.
Design of a novel transmission circuit of transient electromagnetic instrument
XU Yakun , LI Guocai, ZHAO Zhenting, LIAN Kun
2014, 40(7): 28-31. doi: 10.13272/j.issn.1671-251x.2014.07.009
<Abstract>(56) <PDF>(6)
Abstract:
A transmission circuit of transient electromagnetic instrument based on FPGA was designed in order to improve measurement accuracy of transient electromagnetic instrument. Drive circuit of the transmission circuit was designed with module EXB841 to drive MOSFET located at up-down side of H-bridge, innovative H-bridge and control strategy realized very short turn-off time for MOSFET, and peak voltage interference was reduced by use of RCD protect circuit to improve output signal waves of the transmission circuit. The experiment results show that overvoltage of emission signal of the transient electromagnetic transmission circuit is only 1.33 times of the normal voltage, and the time for oscillating and falling edge are 500 ns and 700 ns, separately, which can realize fast turn-off and has good stability.
Wireless power transmission technology and its application in mine safety monitoring system
TIAN Zijian, LIN Yue, CHEN Jian, LI Weixiang, LIN Peng, WANG Wenqing
2014, 40(7): 32-36. doi: 10.13272/j.issn.1671-251x.2014.07.010
<Abstract>(45) <PDF>(5)
Abstract:
The paper introduced concept and development history of wireless power transmission technology, expounded three kinds of wireless power transmission modes of electromagnetic induction mode, radio waves and electromagnetic resonance mode according to existing wireless power transmission standards, and thought that the magnetic coupled resonant wireless power transmission mode is the most promising research area in the future. It analyzed application prospect of the wireless power transmission technology in coal mine according to characteristics of the coal mine working environment and explosion-proof requirements, and pointed out that the mine safety monitoring system is the priority development areas of wireless power transmission technology. It analyzed requirements and significance of application of the wireless power transmission technology in mine safety monitoring system by use of an example and according to Coal Mine Safety Regulation and relevant industry standards, put forward key problems which need to be solved of mine wireless power transmission technology.
Research of automatic drawing technique of mine ventilation network graph
CHENG Lei, LI Jianlei
2014, 40(7): 36-40. doi: 10.13272/j.issn.1671-251x.2014.07.011
<Abstract>(116) <PDF>(10)
Abstract:
In order to grasp current research status of automatic drawing technique of mine ventilation network graph for further study, the paper analyzed from three aspects of information collection of network architecture, generation of network path and drawing of network graph in details. It expounded research contents, research results and existing problems of the three aspects, and finally pointed out the future research directions: the introduction of artificial intelligence, research more efficient network path generation algorithms and how to make network graph simpler and more beautiful.
Application of fiber gratting sensing technology in mine safety monitoring system
TANG Shucheng, ZHANG Jie, ZHANG Heng, ZHOU Feng, YU Shangqi
2014, 40(7): 41-44. doi: 10.13272/j.issn.1671-251x.2014.07.012
<Abstract>(102) <PDF>(18)
Abstract:
The paper analyzed principle of fiber gratting sensing technology and its advantages, and described its typical application in coal mine safety monitoring system. Various types of mine-used sensors based on sensing principle of fiber gratting can achieve monitoring of physical quantity including roof pressure, roof separation, leakage, temperature of worked out section, safety degree of vertical shaft, landslide displacement, and so on.
Application research of two-stage method in evaluation of mine ventilation system
LI Jilong, LIU Bingfeng, LIN Jifei, DONG Juan, XIA Jianbo
2014, 40(7): 45-47. doi: 10.13272/j.issn.1671-251x.2014.07.013
<Abstract>(35) <PDF>(2)
Abstract:
The paper analyzed principle of two-stage method, and took index system optimizing of a mine ventilation system as study object, used two-stage method to calculate its index weights. It did contrastive analysis of two-stage method and analytic hierarchy process, and the results showed that the two methods got the same sequence of importance of the index weights, and the two-stage method has high reliability and simple calculation process.
Research of robust repetitive current control strategy of active power filter
RONG Xiang
2014, 40(7): 48-51. doi: 10.13272/j.issn.1671-251x.2014.07.014
<Abstract>(45) <PDF>(4)
Abstract:
In view of problems of steady-state error and phase offset of traditional current loop PI control of active power filter, a robust repetitive current control strategy of active power filter was proposed, and concrete implementation method of robust repetitive control strategy was analyzed in details.The simulation and experimental results verify that the control strategy can achieve tracking of output compensation current with instruction current and improve anti-interference performance at the same time, which improves dynamic and static performance of active power filter significantly.
Research of control algorithm of active disturbance rejection for permanent magnet linear synchronous motor
BAO Guangqing, DANG Chaoliang
2014, 40(7): 52-56. doi: 10.13272/j.issn.1671-251x.2014.07.015
<Abstract>(31) <PDF>(2)
Abstract:
For characteristics of permanent magnet linear synchronous motor that it is sensitive to external disturbance and parameter variation, an improved active disturbance rejection control algorithm was proposed based on traditional active disturbance rejection technique and in combination with feedforward and feedback control. Using the improved active disturbance rejection control algorithm can effectively observe and compensate dynamic coupling disturbance in speed and position control system of permanent magnet linear synchronous motor. The simulation results show that the improved algorithm has better dynamic and static performance than classical PID and traditional active disturbance rejection control algorithm.
An improved WSNs time synchronization algorithm adapted to vibration monitoring of mine equipment
LI Feifei, ZHANG Ran, ZHANG Shen, HAN Lina
2014, 40(7): 56-60. doi: 10.13272/j.issn.1671-251x.2014.07.016
<Abstract>(35) <PDF>(3)
Abstract:
A WSNs model of vibration monitoring of mine equipment was given combined with actual situation of vibration monitoring of mine equipment. In order to solve problems of large energy consumption of TPSN algorithm and low precision of DMTS algorithm, an improved WSNs time synchronization algorithm named TPDM algorithm was proposed. In TPDM algorithm, cluster head nodes are selected by use of dynamic selection algorithm of cluster head. TPSN algorithm is used for time synchronization among the cluster head nodes to improve synchronization precision and DMTS algorithm is used among nodes in a cluster to reduce energy consumption. Meanwhile, synchronous clock is compensated by use of clock skew compensation algorithm based on the minimum square linear regression. The simulation results show that TPDM algorithm gets a compromise between precision and energy consumption compared with TPSN algorithm and DMTS algorithm, which can meet with requirements of vibration monitoring of mine equipment preferably.
Research of characteristics of transient pulse in coal mine resonant grounding system
WANG Jinhong
2014, 40(7): 61-67. doi: 10.13272/j.issn.1671-251x.2014.07.017
<Abstract>(26) <PDF>(2)
Abstract:
By means of deduction of zero-sequence current expressions when single-phase grounding fault occurs in single substation mode and multi-substation mode of coal mine resonant grounding system, polarity relationship between transient pulse of fault line and normal line, and relationships among amplitude or width of transient pulse, grounding resistance, shunt capacitance and fault time were analyzed, and corresponding expressions were given. Polarity of transient pulse of fault line is opposite to the ones of normal lines, and amplitude of the transient pulse of fault line is the largest among all lines. The amplitude of transient pulse at the fault time is inversely proportional to grounding resistance and proportional to sin of angle of fault phase. All the normal lines have the same width of transient pulse, which is smaller than the one of the fault line, and the width of transient pulse is proportional to the grounding resistance. The Matlab/Simulink simulation proves correctness of above theoretical conclusions.
Improved hysteresis circle current control method for active power filter
YANG Lingxiao, HE Zhiwei
2014, 40(7): 67-71. doi: 10.13272/j.issn.1671-251x.2014.07.018
<Abstract>(53) <PDF>(2)
Abstract:
Hysteresis circle current control method with variable circle width of shunt active power filter not only ensures tracking accuracy of reference current, but controls switching frequency of inverter effectively through adjusting hysteresis circle width real-timely according to current amplitude. Traditional hysteresis circle current control method with variable circle width was improved through adding a fine-tuning link of circle width. When switching frequency of the inverter is low, calculated circle width value is reduced by adding a negative fine-tuning value. The Matlab simulation results show that total harmoic distortion of the system is 1.80% when harmonic current is tracked and compensated by use of the improved method, which is less than the value by use of the traditional method, and actual switching frequency of the inverter is more close to set value.
A kind of digital single-cycle control method of active power filter
ZHENG Feng, LI La
2014, 40(7): 72-75. doi: 10.13272/j.issn.1671-251x.2014.07.019
<Abstract>(37) <PDF>(2)
Abstract:
The paper analyzed working principle of active power filter, derived mathematical model of single-cycle control of three-phase three-wire active power filter. It combined digital single-cycle control and ip-iq harmonic current detection method to realize control of active power filter. Compared with traditional single-cycle control method, the proposed method retains advantages of good real-time performance and robustness, meanwhile cancels the integrator, and reduces complexity of the single-cycle control circuit. The proposed method was simulated using Matlab/Simulink software and validated by experiment platform with DSP as the core, and the results of simulation and experiment prove feasibility and effectiveness of the method.
Control strategy for DC capacitance of mine-used cascaded high voltage inverter
GUO Ruidong, ZHANG Jingjing, XIONG Wanqi, JIN Lei, ZHENG Jie
2014, 40(7): 76-79. doi: 10.13272/j.issn.1671-251x.2014.07.020
<Abstract>(34) <PDF>(4)
Abstract:
In view of problem of large volume of DC capacitor of high voltage inverter cascaded in H-bridge type, a kind of control strategy to minimize DC capacitance by injecting the third-order harmonic into fundamental modulation signal was proposed. The DC capacitor voltage ripple was reduced because part of the low-order harmonic of DC capacitor current was equivalently converted to high-order harmonic when the total modulation index remained the same. The relationship of harmonic content of DC capacitor current and the third-order harmonic injection amount was derived, and the expression of the maximum third-order harmonic injection amount under different power factors was presented. Matlab/Simulink simulation results show that the DC capacitance achieves 24.2% reduction under typical load with 0.85 power factor, which verifies feasibility and effectiveness of the control strategy.
Research of collision avoidance and ranging system of mine locomotive based on laser ranging
WANG Denggui, YANG Ya
2014, 40(7): 80-83. doi: 10.13272/j.issn.1671-251x.2014.07.021
<Abstract>(30) <PDF>(3)
Abstract:
For problems of incorrect ranging caused by interference and high cost of existing collision avoidance system of mine locomotive, a collision avoidance and ranging system of mine locomotive based on laser ranging was designed by use of STC90C516RD+ single chip microcomputer and TDC-GP1 timing chip with high precision. Ranging principle of the system and design schemes of software and hardware were introduced. Ranging test was done for the system in range of 20-100 m with the max original ranging error of 0.22 m. After being linearly fitted and corrected in Matlab by use of the least square method, ranging errors were less than 0.03 m and satisfied ranging requirement at locomotive running.
Design and application of equipment spot-inspection management system of coal mine enterprise
TAN Zhanglu, HAN Qia
2014, 40(7): 84-87. doi: 10.13272/j.issn.1671-251x.2014.07.022
<Abstract>(45) <PDF>(3)
Abstract:
In view of problems of imperfect equipment spot-inspection management system, backward recording tools and no real-time spot-inspection information existed in equipment management of coal mine enterprises, an equipment spot-inspection management system of coal mine enterprise was designed combining with the practical situation of a coal mine. Overall application architecture model and business process of the system were introduced in details, and effect of every business function module of the system was expounded. The implementation of the system completes equipment spot-inspection management institution, regulates the spot-inspection business process and improves the level of equipment management.
Intelligent dispatching and command system of underground transport
WANG Baode
2014, 40(7): 87-89. doi: 10.13272/j.issn.1671-251x.2014.07.023
<Abstract>(46) <PDF>(4)
Abstract:
Components and working principle of an intelligent dispatching and command system of underground transport were introduced. The system realizes functions of position monitoring of locomotive, identification of travel direction, switch control, signal indication, voice communication, safety prewarning, mobile video monitoring, management of transport dispatching, etc. The application shows that the system prevents underground transport accidents effectively, improves management level of underground track transport and reduces labour intensity of workers.
Design of dynamic supervision system of major hazard source and its implementatio
XU Ji
2014, 40(7): 90-93. doi: 10.13272/j.issn.1671-251x.2014.07.024
<Abstract>(49) <PDF>(3)
Abstract:
For lack of classified evaluation, disaster evaluation and emergency plan management of existing hazard source management system, a new dynamic supervision system of major hazard source was designed and realized by taking management requirements of hazard source of safety bureau in a city as background. The system uses layered architecture based on .NET platform and supports many data sources like Microsoft Message Queue and relational database. The system can connect heterogeneous system through Web Service and also simulate disaster coverage area by use of GIS technology. The system provides sufficient functions such as online declaration management of major hazard source, effective recognition, hazard source classification, evaluation of controlling level, disaster simulation and analysis, emergency rescue and so on. The industrial test shows that the system can realize on line management and dynamic supervision of various hazard sources completely.
Design of an embedded share serial server
XIE Guoju
2014, 40(7): 93-95. doi: 10.13272/j.issn.1671-251x.2014.07.025
<Abstract>(30) <PDF>(5)
Abstract:
In view of problems that most serial servers only support main and sub machines but not support multiple main machines and Modbus TCP converting to Modbus RTU at present, an embedded share serial server was designed. The share serial server uses LM3S9B92 chip based on Cortex-M3 and realizes conversion function of a single-chip Ethernet to 3 serial ports. The test results show that the share serial server can send-receive data correctly with high communication rate and realizes function of converting Modbus TCP to Modbus RTU.
Design of embedded monitoring and control platform of conveyor equipment of fully mechanized coal face of coal mine
DU Yan, MENG Guoying, ZHANG Hanwen, ZHANG Miaotian, FENG Yu
2014, 40(7): 96-98. doi: 10.13272/j.issn.1671-251x.2014.07.026
<Abstract>(42) <PDF>(2)
Abstract:
For problems of complex hardware structure, high cost, oversized and non-ideal heat dissipation existed in current domestic monitoring and control system of conveyor equipment of fully mechanized coal face of coal mine, a design scheme of monitoring and control platform of conveyor equipment of fully mechanized coal face based on embedded technology was proposed. The embedded micro-controller STM32 is taken as core of hardware of the platform, and transmission of monitoring data is realized via integrated RS485, Ethernet and other interface. Multitasking application software of the platform is developed based on embedded real-time operating system μC/OS-II, and the human machine interaction is designed with embedded graphical user interface software μC/GUI. The platform can realize centralized monitoring and control of working condition and stopping and starting state of each equipment, and has advantages of high cost performance, high integration and low power consumption.
A method of precise measurement of air speed in mine ventilatio
SA Xianchun, CAO Juan, WANG Ning
2014, 40(7): 99-103. doi: 10.13272/j.issn.1671-251x.2014.07.027
<Abstract>(64) <PDF>(2)
Abstract:
In view of problem that it is hard to precisely measure time of pulse arriving at receiving sensor due to presence of start-up process when ultrasonic sensor receives ultrasonic pulse signal, the paper proposed a method of precise measurement of air speed in mine ventilation. The method fits the curve and envelope curve of sinusoidal signals received by receiving sensor, and calculates time of the ultrasonic pulse signal arriving at the sensor. The results of calculation and analysis of simulate sampling data show that the method can achieve high measuring precision, which can improve measurement accuracy of mine tunnel air speed.
Research of remote intelligent control system of mine hoist group
FU Guixiang, ZHOU Hongjun, HE Li
2014, 40(7): 103-105. doi: 10.13272/j.issn.1671-251x.2014.07.028
<Abstract>(44) <PDF>(6)
Abstract:
The paper introduced overall design, hardware structure design and main functions of remote intelligent control system of mine hoist group. The system combines Internet of Things and communication technology, uses M2M gateway technology to complete conversion of heterogeneous data, and achieves functions of remote monitoring and system maintenance, fault diagnosing and so on. It improves mine hoisting capacity and reduces production cost.
Design of intelligent control system for continuous gangue discharging of whole rock roadway based on PLC
FU Rukang
2014, 40(7): 106-108. doi: 10.13272/j.issn.1671-251x.2014.07.029
<Abstract>(34) <PDF>(2)
Abstract:
In order to improve gangue discharging efficiency, an intelligent control system for continuous gangue discharging of whole rock roadway based on PLC was designed according to gangue discharging technics consisting of excavator, belt conveyor, continuous gangue seperator and tramcar. Functional requirements of the system were introduced, and overall control scheme and control flow of the system were analyzed in details. The industrial application results show that the system has safe and stable operation, and gangue discharging efficiency increases 20%.
Research of project portfolio information management platform of coal enterprise based on multi-Agent and grid technology
YANG Bin, LI Mo
2014, 40(7): 109-112. doi: 10.13272/j.issn.1671-251x.2014.07.030
<Abstract>(47) <PDF>(2)
Abstract:
In order to solve heterogeneous problem of information platforms developed by participants of project portfolio of coal enterprise, a project portfolio information management platform of coal enterprise based on multi-Agent and grid technology was proposed, and framework of the platform, function design scheme of each Agent entity and running process of the platform were introduced. The platform utilizes grid technology to realize integration of heterogeneous platforms, so as to make participants of project portfolio achieve collaborative work. The platform also uses multi-Agent system to integrate grid environment into heterogeneous platforms, so as to realize unified configuration and management for all information platforms of participants. Validity of the platform is verified through application in a coal enterprise.

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