2015 Vol. 41, No. 10

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Cover Catalogue
Design of distributed coal-rock stress monitoring system
MU Dengcong, MENG Lei, DING Enjie, ZHANG Shen, DENG Yuanfang
2015, 41(10): 1-4. doi: 10.13272/j.issn.1671-251x.2015.10.001
<Abstract>(18) <PDF>(3)
Abstract:
In view of problems of complex wiring, bad extensibility and low real-time performance of data transmission existed in coal-rock stress monitoring, a distributed coal-rock stress monitoring system based on wireless sensor network was designed. The system takes CC2530 as core, collects drilling coal-rock stress through sensor node. Routing node receives and transmits the collected data to sink node through ZigBee network. The sink node sends the data to upper computer for display, storage and analysis through industrial Ethernet. The test results show that the system can realize real-time and accurate monitoring of coal-rock stress with the maximum communication distance between sensor node and sink node is 50 m and has advantages of convenient operation, flexible deployment and easily to expand.
PLC centralized control system of coal preparation plant based on wireless communicatio
ZHANG Chuanwei, ZHANG Peng
2015, 41(10): 5-8. doi: 10.13272/j.issn.1671-251x.2015.10.002
<Abstract>(45) <PDF>(3)
Abstract:
In view of problems of complex wiring and high damage rate of communication cable existed in cable communication mode between PLC centralized control system of coal preparation plant and field equipment, a design scheme of PLC centralized control system of coal preparation plant based on wireless communication was proposed. The system uses CP340 communication module and data radio station to realize wireless communication between lower computer control station S7-300 PLC and ET200M distributed I/O substation, solves problems of complex cable wiring, high cable damage rate and inconvenient maintenance of coal preparation plant communication, and realizes data wireless communication of centralized control system of coal preparation plant.
Design of control system of underground unmanned transportation locomotive based on fuzzy control
SONG Liude, YIN Zhu, YAO Shanhua
2015, 41(10): 8-11. doi: 10.13272/j.issn.1671-251x.2015.10.003
<Abstract>(57) <PDF>(3)
Abstract:
In view of problems of big error and easy to fall into danger that control of existing underground transportation locomotive adopted manual correction method by driver, a control system of underground unmanned transportation locomotive based on fuzzy control was designed. The system uses fuzzy control technology, adopts STM32F10 single-chip microcomputer as main control module, frequency converter as actuators, so as to control motor speed, and achieves the goal of rate control, brake and obstacle avoidance. Meanwhile, the system can use the upper monitoring system to real-timely monitor transportation locomotive, implements unmanned and intelligentialize for the underground transportation locomotive, and improves the safety of mine production.
Design of microseism signal collection system with high dynamic range
ZHANG Faquan, LI Zongmin, WANG Guofu, YE Jincai
2015, 41(10): 12-15. doi: 10.13272/j.issn.1671-251x.2015.10.004
<Abstract>(53) <PDF>(3)
Abstract:
In order to improve collection range and signal noise ratio, a microseism signal collection system with high dynamic range was designed. The system selects amplifier gain according to magnitude of collected signal, and adjusts the signal to suitable A/D sampling range. The adjusted data is processed through digital filter and transmitted to upper computer by RS422 interface. The test results show that the system can accurately collect microseism signals of different strength with 136 dB dynamic range.
Experimental research of variation characteristics of electromagnetic radiation, acoustic emission and surface electric potential during water inrush in mine floor
LYU Ganggang, SHEN Rongxi, QIU Liming, ZHAO Cong, QI Jinxing, WANG Jinghao
2015, 41(10): 16-19. doi: 10.13272/j.issn.1671-251x.2015.10.005
<Abstract>(25) <PDF>(2)
Abstract:
A simulation experiment system of mine water inrush was built, and variation characteristics of electromagnetic radiation, acoustic emission and surface electric potential signals were researched during mine water inrushing process. The research results show that variation trend of the three signals is generally described as a stable initial stage, a fluctuant middle stage and a fast-descending ending stage during mine water inrushing process. The three signals has positive correlation with rupture of floor strata, so as to illustrate rupture situation inside coal rock during mine water inrushing process. Fast increasing trend of these signals can be regarded as a forecast of rock rupture, while sudden drop after a significant rise of the electromagnetic radiation signal can be a harbinger of water inrush.
Research of oxygen concentration and temperature detection system
GONG Zhongqiang, LI Jun, ZHANG Shulin, GUO Qinghua
2015, 41(10): 20-23. doi: 10.13272/j.issn.1671-251x.2015.10.006
<Abstract>(68) <PDF>(4)
Abstract:
For problems that long response time, low precision and poor reliability of existing coal mine fire monitoring technologies, a oxygen concentration and temperature detection system was designed based on tunable laser absorption spectroscopy detecting technology. The system has been tested in laboratory. The test results show that the measurement error of the system is less than 1% when oxygen concentration is 0-100.0%, and the one is less than 2% when gas temperature is 253-1 000 K.
Synchronous collection protocol of seismic wave based on wireless sensor networks
TIAN Chuangeng, XU Zhao, TANG Lu
2015, 41(10): 23-27. doi: 10.13272/j.issn.1671-251x.2015.10.007
<Abstract>(79) <PDF>(2)
Abstract:
For the problem that oscillator frequency offset of collecting nodes of wireless sensor networks would cause sampling time error during seismic wave collection of advanced probing system of coal mine seismic wave, quantization relation between oscillator frequency offset of collecting nodes and the maximum sampling times was analyzed by modeling, and a continuous synchronization protocol of wireless sensor networks node was proposed. In the protocol, sink node sends broadcast twice to collecting nodes, and collecting nodes achieve time synchronization with high precision by counting interval of the broadcast. The experimental result shows that the protocol guarantees the maximum sampling time error between the nodes is less than 2 μs during seismic wave collection with sampling frequency of 5 kHz for 3 s.
Characteristic analysis of different periodic arrangement ways of low-frequency metamaterial structure
ZHU Yuanzhong, LI Weixiang, MA Fengzhen, ZHANG Xiangyang, TIAN Zijian
2015, 41(10): 27-31. doi: 10.13272/j.issn.1671-251x.2015.10.008
<Abstract>(64) <PDF>(3)
Abstract:
S parameters of three periodic arrangement ways of low-frequency metamaterials structure were simulated by HFSS software based on square dual-layer planar spiral structure model, including periodic tiling arrangement structure, periodic parallel arrangement structure and periodic cross arrangement structure. Effective electromagnetic parameters were extracted from the S parameters to analyze metamaterial characteristic of the three arrangement ways in low-frequency range. The simulation results show that the incident wave can be completely reflected back by the periodic tiling arrangement structure, the periodic parallel arrangement structure is a kind of low-frequency magnetic negative metamaterial and the periodic cross arrangement structure is a kind of low-frequency left-handed material.
Fault line selection method based on local global consistency learning algorithm
MA Caoyuan, LUO Yanfang, LI Chunxiao, CUI Lianhua
2015, 41(10): 32-36. doi: 10.13272/j.issn.1671-251x.2015.10.009
<Abstract>(30) <PDF>(2)
Abstract:
For inaccurate line selection problem of existing fault line selection methods used in power system connected to earth through an arc suppression coil or fault selection for phase voltage zero-crossing point, a kind of small current line selection method was proposed which was based on local global consistency learning algorithm. In the method, primary grounding fault signals are processed by Fourier transform firstly, then characteristic value of each fault signal is processed by local global consistency learning algorithm, and fault characteristic signals are judged through cyclical transmitting labels at last, so as to select fault line. The Matlab simulation and laboratory testing results verify that the method has higher reliability and accuracy of fault line selection.
Improvement research of line selection criterion of direction protection based on data mining
LI Pengju, JIANG Xiaoping, GUO Jingyu, HUANG Chaojie, SHI Xuan, LI Jia
2015, 41(10): 36-39. doi: 10.13272/j.issn.1671-251x.2015.10.010
<Abstract>(6) <PDF>(2)
Abstract:
In view of the problem that traditional line selection criterion can not accurately identify interfering signal and may cause frequent mistrip, improvement was carried out to traditional line selection method, namely using K-means algorithm of data mining for clustering analysis, and identifying true zero-sequence current of leakage and interfering signal according to historical data of a branch, so as to improve accuracy of line selection criterion.
Study of synchronous stability of power grid based on complex network theory
XU Yanqing, ZHU Lijun, LYU Yanan, REN Jianping
2015, 41(10): 40-45. doi: 10.13272/j.issn.1671-251x.2015.10.011
<Abstract>(23) <PDF>(3)
Abstract:
Weighted dynamic model of power grid was built, and network topology and intrinsic link between characteristics of the networks were in-depth researched based on IEEE14 nodes standard test system. The capacity of self synchronization of system was studied from aspects of coupling strength, power disturbances and different ways of generator accessing into power grid, and factors affecting the stability of the system were analyzed.
Fatigue life prediction method of hydraulic support front link
YAO Lingling, HE Naibao, GAO Qian, SONG Wei
2015, 41(10): 46-48. doi: 10.13272/j.issn.1671-251x.2015.10.012
<Abstract>(21) <PDF>(2)
Abstract:
For theseover-elaborate calculation of fatigue life of hydraulic support front link, a method of fatigue life prediction method of hydraulic support front link was proposed which adopted BP neural network optimized by genetic algorithm. Design parameters under 40 level are selected by use of Latin Hypercube. Fatigue life value under each parameter level is calculated through ANYSY finite element analysis software. A neural network model between design parameters and fatigue life is established by BP neural network optimized by genetic algorithm learning the first 30 groups of data, and the rest of 10 groups of data is used to verify prediction accuracy of the model. The prediction result shows that the method has small prediction error.
Research of coal mine safety management platform based on Internet of Things
ZHANG Qi, PAN Tao, WANG Hao
2015, 41(10): 49-52. doi: 10.13272/j.issn.1671-251x.2015.10.013
<Abstract>(19) <PDF>(4)
Abstract:
For problems that existing coal mine safety management systems focused on data monitoring and analysis based on a single object without comprehensive analysis, and there was no effective integration among the systems, a new coal mine safety management platform was proposed which was based on Internet of things technology, and design schemes of the whole structure and each layer of the platform were introduced. The platform can realize functions of illegal behavior monitoring, disaster warning and risk analysis through integrating related safety management systems and comprehensive analysis of all kinds of coal mine data.
Design of mine equipment management system based on Internet of Things
ZHONG Yuan, WEI Guobin, LI Cuiping, RUAN Zhuen
2015, 41(10): 52-55. doi: 10.13272/j.issn.1671-251x.2015.10.014
<Abstract>(19) <PDF>(5)
Abstract:
In view of problem of low efficiency of existing mine equipment management, mine equipment management system based on Internet of Things was designed, architecture of Internet of Things of the system was introduced, the design of function module of the system was expounded. The system can dynamically track and collect information of mine equipment, and implements dynamic management of mine equipment from the whole working process of procurement, acceptance check, inbound, outbound, operation, maintenance and scrap, improves efficiency of equipment management.
Study on coordination of coal mine emergency rescue system
WU Baolei, ZHANG Junbo, WANG Enyuan
2015, 41(10): 56-60. doi: 10.13272/j.issn.1671-251x.2015.10.015
<Abstract>(20) <PDF>(3)
Abstract:
A coordination model of coal mine emergency rescue system was established by use of social network theory based on analysis of coordination features of coal mine emergency rescue system, and coordination status was acquired by calculating point centrality, network density, unit coordination entropy and system coordination entropy. The application results show that quantitative analysis and evaluation of coordination status of coal mine emergency rescue system can be realized with application of social network analysis method in coal mine emergency rescue system, which has guiding significance for promoting efficiency of coal mine emergency rescue system.
Implementation methods of Modbus protocol
JIA Yunhong
2015, 41(10): 61-65. doi: 10.13272/j.issn.1671-251x.2015.10.016
<Abstract>(20) <PDF>(3)
Abstract:
Implementation methods of Modbus protocol in different controllers were introduced. The communication failure of Modbus protocol in practical application was analyzed and solution was proposed. The key problems of Modbus protocol in actual use were expounded. The application results show that using the methods in this paper can design reliable, stable and simple Modbus network system and improve the performance of electrical control system of mining equipments.
Design and implementation of multi-protocol gateway of coal mine
XIN Yongxiang, ZHANG Xiaobo, LIU Jingwei
2015, 41(10): 65-67. doi: 10.13272/j.issn.1671-251x.2015.10.017
<Abstract>(24) <PDF>(3)
Abstract:
For low real-time performance of traditional serial data processing mode, a design scheme of multi-protocol gateway based on FPGA was proposed, and the overall architecture, key hardware circuit design and software design were given. The gateway takes advantage of parallel execution of FPGA, and can access 485 bus signal, CAN bus signal, frequency signal, digital signal, ZigBee wireless signal and Ethernet signal. It achieves simultaneous acquisition and real-time transmission of sensor signals with different rates and interfaces.
Research of position detection method of cutting head of boom-type roadheader
GAO Be
2015, 41(10): 68-71. doi: 10.13272/j.issn.1671-251x.2015.10.018
<Abstract>(10) <PDF>(4)
Abstract:
The paper analyzed and compared several common position detection methods of cutting head of boom-type roadheader, and obtained following conclusions: the position detection method based on rotation encoder is easy to install on existing structure of roadheader, it is a mature detection method, but it is difficult to protect on-site; the position detection method based on oil cylinder stroke has small space, less maintenance quantity, but it needs redesign existing driving oil cylinder, and has high reliability requirements on the oil cylinder. The conclusion has certain reference significance to position detection of slewing mechanism of mining equipment.
Application of SDS-TWR technology in coal mine personnel positioning system
CHANG Li
2015, 41(10): 71-73. doi: 10.13272/j.issn.1671-251x.2015.10.019
<Abstract>(20) <PDF>(2)
Abstract:
For problem that most coal mine personnel positioning system can only get area of underground personnel without accurate positioning function, principle of SDS-TWR technology was introduced and the technology was applied into coal mine personnel positioning system. The test results show that ranging error of coal mine personnel positioning system based on SDS-TWR technology is less than 2 m, which can meet accuracy requirement of underground personnel positioning.
Design of energy management system of mine electrical equipment
YANG Wanqing, ZHAO Bingqing, TIAN Jinzhao, MENG Xiangzhong, YIN Tao
2015, 41(10): 73-76. doi: 10.13272/j.issn.1671-251x.2015.10.020
<Abstract>(20) <PDF>(3)
Abstract:
In view of problem of scattered and difficult management of coal mine electrical equipment, an energy management system of mine electrical equipment based on MCGS configuration software was designed. The system uses three layers structure of intelligent instruments-substation-upper computer to realize on-line monitoring of electric power data, which can store, process, count, inquire and analyze the energy consumption data of electrical equipment through the configuration software. The system can provide effective basis for improving level of energy efficiency and realization of energy saving efficiency of enterprises.

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