2016 Vol. 42, No. 8

  Previous Issue | Next Issue 
Display Method:
Cover Catalogue
Design and application of mine integration dispatching communication system
XUE Xiaoyan, HUO Zhenlong, GU Jun
2016, 42(8): 1-5. doi: 10.13272/j.issn.1671-251x.2016.08.001
<Abstract>(53) <HTML> (10) <PDF>(8)
Abstract:
In view of problem that most mine communication systems scattered, and could not cross the others for scheduling command, a mine integration dispatching communication system was designed, and composition and functions of the system were introduced. The practical application results show that the system can be compatible with existing coal mine communication system, provide efficient business platform and bridge to leapfrog communication among each system, and effectively improve mine emergency scheduling disposal ability and management level of coal mine safety production.
Design of an intelligent seperated style gas inspection system for coal mine
CHEN Xiaolin, SUN Jinyu
2016, 42(8): 6-9. doi: 10.13272/j.issn.1671-251x.2016.08.002
<Abstract>(48) <HTML> (9) <PDF>(7)
Abstract:
In view of problems existed in traditional gas inspection system , a new type of intelligent seperated style gas inspection system for coal mine was designed. The system is consisted of intrinsically safe inspection recorder, intrinsically safe portable multi parameter inspection instrument, site card, personal card and inspection server on the ground. The system completes collection of dynamic gas data, data comparison and data analysis on site by inspection recorder, then the processed data is sent to the inspection server on the ground through wireless network. The inspection server on the ground will output dynamic reports according to demands, and sends out early warning automatically.
Roller fault detection of belt conveyor based on φ-OTDR technology
SUN Wei, DIAO Dongmei
2016, 42(8): 9-12. doi: 10.13272/j.issn.1671-251x.2016.08.003
<Abstract>(67) <HTML> (9) <PDF>(11)
Abstract:
For low correctness and efficiency of existing roller fault detection methods of belt conveyor, a roller fault detection method of belt conveyor based on φOTDR technology was proposed. The method uses backward Rayleigh scattering of coherent pulse light to detect vibration signals of roller, so as to identify and locate fault roller. The experimental and test results show the method can realize roller fault detection of belt conveyor with location error of less than 5 m.
A precision control system for train dust suppressant spraying based on ultrasonic space identificatio
LIU Yu
2016, 42(8): 13-16. doi: 10.13272/j.issn.1671-251x.2016.08.004
<Abstract>(30) <HTML> (9) <PDF>(5)
Abstract:
In view of problems that current dust suppressant spraying system of train has low equipment safety and poor quality of dust suppression operation, a precision control system for train dust suppressant spraying based on ultrasonic space identification was designed, and corresponding software control flow of the system was given. The system uses ultrasonic detection device to precisely control coal dust suppression spraying arm of train, which can effectively avoid other locomotive, identify materials or vehicle load conditions, and improve quality of spraying.
Design of underground voice transmission system by visible light
ZHANG Shen, ZHANG Zhen
2016, 42(8): 17-20. doi: 10.13272/j.issn.1671-251x.2016.08.005
<Abstract>(42) <HTML> (8) <PDF>(7)
Abstract:
Based on low communication rate requirement of underground visible light communication, an underground voice transmission system by visible light between mobile caplamp and hydraulic ram LED base station was designed by use of pulse code modulation mode. In the system, voice signal is coded by TP3067, and the coded signal is added direct current signal to drive LED. The received coded signal by receiver is decoded to renew the voice signal after photoelectric detection and amplifying. The experimental results show that the system error rate is 10-83 when receiving power is -9 dB?m under system communication rate of 2.048 Mbit/s, which realizes voice transmission without distortion.
Research on interference mechanism between microwave power transmission and data communication in co-channel
MAN Zhongcheng, LIU Xiaoming, ZHAO Duan
2016, 42(8): 21-24. doi: 10.13272/j.issn.1671-251x.2016.08.006
<Abstract>(61) <HTML> (9) <PDF>(6)
Abstract:
Influence relationship between microwave power transmission and sensor node communication was researched in intermittent co-channel mechanism. A frame loss rate model was established, and the relationship among frame loss rate, power transmission time, power suspension time and data transmission rate was analyzed. The simulation results show that the frame loss rate raises along with the ratio of power transmission time and power suspension time; when the data transmission rate is below 100 kbit/s, the frame loss rate declines with decreasing of the data transmission rate. The real measurement result proves the validity of the frame loss rate model.
Research on spectrum sensing algorithm of coal mine based on Strackelberg game theory
ZHANG Ping, ZHOU Qiong, SUN Qian
2016, 42(8): 25-28. doi: 10.13272/j.issn.1671-251x.2016.08.007
<Abstract>(42) <HTML> (16) <PDF>(5)
Abstract:
In view of problem of low accuracy of spectrum sensing technology of coal mine, a spectrum sensing algorithm of coal mine based on Strackelberg game theory was proposed. The algorithm divides cognitive nodes into leading nodes and following nodes according to good or poor sensing performance of cognitive nodes, and following nodes with poor sensing performance take the decision of leading nodes which have good sensing performance. The Matlab simulation results show that the algorithm improves spectrum sensing performance of coal mine.
Pre-evalution research of using coal seam water injection to control strong pressure in Zhaozhuang Coal Mine
QIAN Jifa, LIU Xiaofei, LIU Zhentang, LIN Song
2016, 42(8): 29-32. doi: 10.13272/j.issn.1671-251x.2016.08.008
<Abstract>(83) <HTML> (10) <PDF>(4)
Abstract:
In order to assess effect of using coal seam water injection to control strong pressure of No.3 coal seam of Zhaozhuang Coal Mine, pre-evaluation research of using coal seam water injection to control strong pressure was carried out. Water injection parameters including moisture content, water absorption, firmness coefficient of coal sample and so on were tested to analyze feasibility of water injection of No.3 coal seam. Absolute variation and change rate of compressive strength of test sample before and after soaking were test to analyze expected pressure-relief effect of water injection and propose injection project. The analysis result shows that No.3 coal seam can meet the conditions of water injection, and after soaking, physical properties of coal and rock samples are changed, compressive strength is reduced greatly, which indicates water injection has desired expected pressure-relief effect.
Detection and early warning of coal mine underground safety event based on event drive
WANG Liang
2016, 42(8): 33-37. doi: 10.13272/j.issn.1671-251x.2016.08.009
<Abstract>(87) <HTML> (9) <PDF>(6)
Abstract:
A detection and early warning trigger mode of coal mine underground safety event based on event driven was constructed by using complex event processing technology. By adopting underground RFID personnel positioning data and environmental monitoring data as application data, a largescale underground safety flow data processing framework based on complex event processing technology was built. And then a double layer parallel mechanism for self learning of offline data association rule and self matching of online data matching tree structure was designed, so as to achieve high efficiency detection and early warning trigger for early warning of underground safety event. The test results show that the detection and early warning trigger mode of coal mine underground safety event based on event driven has significant advantages in abnormal event detection and detection efficiency compared with safety monitoring model based on relational database.
Fault location method for distribution network based on Petri net and double criterions
GAO Zhengzhong, XU Huanqi, LEI Qian, LI Shiguang, WANG Qingli
2016, 42(8): 37-42. doi: 10.13272/j.issn.1671-251x.2016.08.010
<Abstract>(58) <HTML> (10) <PDF>(6)
Abstract:
In order to improve operation speed and fault tolerance capability of fault location system of distribution network, a fault location method for distribution network based on Petri net and double criterion was proposed. Fault diagnosis was done according to voltage criterion and current criterion, and error correction of redundancy information was achieved through double criterions and probability information. Structure and the definition of Petri net combined with probabilistic information was introduced firstly, and then general Petri net model of fault location was established, finally, validity and feasibility of the proposed method were validated by simulation of fault localization procedure of distribution network with two standard wiring modes.
Coal piling detection of coal transport belt of power plant based on vision measurement
WANG Jiansheng, GUO Peng, HAO Zhen, GUO Lu
2016, 42(8): 43-47. doi: 10.13272/j.issn.1671-251x.2016.08.011
<Abstract>(34) <HTML> (9) <PDF>(4)
Abstract:
In view of problems of false alarming and triboelectrification existed in existing coal conveying belt system with coal piling sensor to detect state of coal piling of belt, a non-contact detection method of coal piling of belt based on vision measurement was proposed. The method uses monocular vision technology in visual inspection to construct small hole imaging model, and can measure coal piling of belt. The experimental results show that the method has advantages of high real-time property and good detection effect with detection accuracy of about 95%, which complies with design requirements.
Gear box fault diagnosis based on Elman neural networ
LIU Jingyan, LI Yudong, GUO Shunjing
2016, 42(8): 47-51. doi: 10.13272/j.issn.1671-251x.2016.08.012
<Abstract>(34) <HTML> (8) <PDF>(3)
Abstract:
For problems of slow convergence speed and low precision existing in gear box fault diagnosis method based on traditional BP neural network, a gearbox fault diagnosis model based on Elman neural network was proposed. In the model, feature vectors are taken as input information and fault types as output information. An improved genetic algorithm is used to optimize weights and thresholds of Elman neural network, and the optimized Elman neural network is used for gear box fault diagnosis. The simulation results show that the model accelerates network convergence speed and improves accuracy and precision of gear box fault diagnosis.
Fault diagnosis of circuit breaker based on improved dynamic time warping algorithm
JIANG Zhihao, YU Qun, DONG Li
2016, 42(8): 52-55. doi: 10.13272/j.issn.1671-251x.2016.08.013
<Abstract>(44) <HTML> (11) <PDF>(4)
Abstract:
In order to accurately diagnose the fault of circuit breaker according to its condition monitoring data, a fault diagnosis method of circuit breaker based on improved dynamic time warping algorithm was proposed. The method combines Sakoe-Chiba window with traditional dynamic time warping algorithm, takes opening/closing coil current as analysis object, and extracts potential fault information of the circuit breaker opening/closing mechanism, provides basis for condition maintenance of circuit breaker. Current acquisition circuit of opening/closing coil of breaker was designed, and the effectiveness of the proposed method was verified through actual current signal sampling and analysis.
Research of risk assessment reliability of relay protection based on Three-parameter Weibull distributio
ZHOU Peiqiang, ZHOU Mengran, XIEYing, WANG Pingping, CAO Zhenguan, LUO Qian
2016, 42(8): 56-61. doi: 10.13272/j.issn.1671251x.2016.08.014
<Abstract>(42) <HTML> (11) <PDF>(5)
Abstract:
In view of problems that traditional risk assessment and reliability analysis methods of power grid focused on relay protection reliability indicators and did not involve change of reliability and actual risk in operation of relay protection device, the paper put forward a method that used three-parameter Weibull distribution to estimate time-varying failure rate, and established Markov model with 10 state based on multiple factors. It obtained time-varying failure rate function model through analyzing and processing data of power grid operation and management by Matlab simulation software; in combination with software and hardware and management factors, it also built process hidden risk assessment system of relay protection device based on Markov model by PSS/E software. The experimental results show that the system can early find and rectify hidden danger in power grid, which improves management level of the power grid, and realizes safe and stable operation of the power grid.
Research of single-phase fault line selection of power distribution network based on fifth harmonics energy and LM-Elman neural network
SUN Qidong, ZHANG Kairu, SONG Xiangmin, LI Liming, MA Hui, WANG Yi
2016, 42(8): 61-64. doi: 10.13272/j.issn.1671-251x.2016.08.015
<Abstract>(39) <HTML> (12) <PDF>(7)
Abstract:
In view of the problem of low accuracy of amplitude comparing line selection method based on traditional fifth harmonic, a single-phase fault line selection method of power distribution network based on fifth harmonics energy and LM-Elman neural network was proposed. Firstly, wavelet packet was used for three-layer decomposition and reconstruction of fifth harmonics in zero-sequence current, and the total energy of the third layer reconstructed wavelet coefficients was obtained; then normalized energy values were used as input of Elman neural network, LM algorithm was used for training and testing. The simulation results show that the method can accurately select fault line in distribution network.
An identification method for UPS rapid switching
FANG Xupeng, LI Hui, ZHUANG Jianwei, CHEN Zhiqiao
2016, 42(8): 65-69. doi: 10.13272/j.issn.1671-251x.2016.08.016
<Abstract>(63) <HTML> (15) <PDF>(4)
Abstract:
For incorrect operation of existing identification methods for UPS switching, an identification method for UPS rapid switching was designed by use of DSP technology. The method uses software lock mode, and adopts AC voltage amplitude and phase signals colleted and processed by DSP to measure power fail and voltage drop. When the measured value exceeds the setting one, USP would be switched. The experimental result shows the method can determine AC power fail and voltage drop, and achieve UPS switching in about 1 ms.
An improved id-iq harmonic current detection algorithm for three-phase voltage asymmetry
ZHOU Zhaoxian, CHEN Yonggang
2016, 42(8): 69-73. doi: 10.13272/j.issn.1671-251x.2016.08.017
<Abstract>(40) <HTML> (11) <PDF>(3)
Abstract:
Due to phase angle measured by phase locked loop has phase difference with grid positive sequence fundamental voltage of traditional id-iq harmonic detection method in grid voltage asymmetry and distortion phase, at the same time, low pass filter performance used in traditional id-iq harmonic detection method will influence accuracy and real-time performance, an improved id-iq harmonic detection algorithm was proposed, namely using of fundamental positive sequence current with good symmetry to instead of instantaneous voltage to lock phase, so as to eliminate measured phase difference of phase angle of power grid, and using of average value theory to replace function of the low pass filter，in order to reduce time delay and improve real-time performance and detection accuracy of the algorithm. The Matlab/Simulink simulation result proves that the algorithm is correctness.
Design of a new mine-used part-turn electric valve controller
WANG Xueming
2016, 42(8): 74-76. doi: 10.13272/j.issn.1671-251x.2016.08.018
<Abstract>(26) <HTML> (6) <PDF>(4)
Abstract:
In order to improve intelligent level of electric valve controller, a new mine-used part-turn electric valve controller was designed. The controller uses absolute digital encoding technology to achieve high precision valve position detection, and uses current detection to achieve highly reliable function of over-torque protection of motor. Compared to conventional mine-used valve controller, the interface and control mode of the new controller are more flexible and intelligent level is higher.
Research and application of SVG technology in coal mine monitoring and control system
CHEN Yunqi
2016, 42(8): 77-79. doi: 10.13272/j.issn.1671-251x.2016.08.019
<Abstract>(38) <HTML> (7) <PDF>(3)
Abstract:
In order to release coal mine real-time data with high efficiency and in the form of graphic image, the paper proposed to apply SVG technology in coal mine monitoring system, and introduced real-time data release scheme based on SVG technology. The scheme uses Ajax technology to obtain real-time data in database server, and uses SVG technology to build intuitive and realtime vector graphics page of remote monitoring, which achieves loading and display of real-time data.
Design of online monitoring system of coal mine voltage quality based on LabVIEW
LI Jinxi, CHEN Jiyong
2016, 42(8): 80-84. doi: 10.13272/j.issn.1671-251x.2016.08.020
<Abstract>(33) <HTML> (11) <PDF>(3)
Abstract:
In view of increasingly serious problem of power supply quality of coal mine power grid, an online monitoring system of coal mine voltage quality was designed by use of signal processing circuit, data acquisition unit and technology of virtual instrument of LabVIEW. Simulation and test results show that the system realizes online monitoring of power supply voltage quality of underground power grid, has functions of wave display in real time, measurement of parameters of voltage, frequency, harmonics, three-phase voltage unbalance factor, voltage fluctuation and flicker, data storage and data analysis, and is good in measurement accuracy and high in reliability with practice.

苏ICP备 05016349号-2

Supported by: Beijing Renhe Information Technology Co. Ltd.  Visits：