2016 Vol. 42, No. 10

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Coal mine accident and emergency rescue technology and equipment
SUN Jiping, QIAN Xiaohong
2016, 42(10): 1-5. doi: 10.13272/j.issn.1671—251x.2016.10.001
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Abstract:
The paper analyzed the number of various types of accidents, deaths and their ratios in Chinese coal mines from 2004 to 2015, and analyzed existing problems of coal mine accident emergency rescue technology and equipment. Occurrence of accidents mainly relies on manual discover, and emergency response time is long. Emergency communication and precision personnel positioning systems in underground coal mine are vulnerable to disaster, where disaster location and/or personnel position cannot be determined. Remote sensing range of disaster environment is small, the reliability is poor, and it is difficult to meet needs of disaster relief. Emergency scheme has poor pertinence and applicability. Emergency decision making is mainly depended on experience. Efficiency of manual demolition and support rescue equipment is low. Wind flow after disaster cannot be controlled real-timely and effectively, etc. It put forward emergency rescue technology of coal mine accident and key scientific and technical problems of equipment: ① determination method and technology of identification and spread range of serious accidents in coal mine; ② intelligent emergency scheme and rescue assistant decision making technology based on big data; ③ anti disaster emergency communication technology for coal mine; ④ precision personnel positioning technology in disaster (difficult); ⑤ intelligent control technology of wind flow after fire, gas and coal dust explosion disasters; ⑥ evacuation guidance technology for people in distress; ⑦ flying robot technology for monitoring disaster environment; ⑧ gas remote sensing technology in disaster environment; ⑨ rapid construction technology for rescue channel, etc.
A dynamic load identification method of roadheader
WANG Wei, YAN Lin, JIN Tao, WU Dongxun, LIU Xingting, ZHANG Shifeng, HAN Yu, ZHANG Ying
2016, 42(10): 6-11. doi: 10.13272/j.issn.1671—251x.2016.10.002
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Abstract:
For problems of varied roadheader loads and difficult real-time identification of dynamic load during roadheader working, a dynamic load identification method of roadheader was proposed which was based on multi neural networks and evidence theory. In the method, vertical, horizontal and axial components of vibration signal are analyzed separately by use of RBF neural network, then preliminary results from RBF neural network are fused by use of D-S evidence fusion theory, so as to identify dynamic load of roadheader real-timely. The analysis of actual example show that accuracy rate of dynamic load identification of roadheader achieves 88%.
Design of pipeline leakage monitoring system for coal mine
ZHAO Lin, WANG Jiqiang, HOU Moyu
2016, 42(10): 12-15. doi: 10.13272/j.issn.1671—251x.2016.10.003
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Abstract:
For problems existed in manual inspection method of pipeline running monitoring in coal mine underground such as laborious consumption, time consumption, difficult leak point detection under sudden conditions and so on, a pipeline leak monitoring system for coal mine was designed which was based on optical fiber sensing technology and negative pressure wave signal detection and location principle. Structure of the system was introduced as well as key technologies including enhancement sensitivity structure of fiber pressure sensor and accurate acquisition technology of negative pressure wave falling edge signal. Long-time running test and reliability test of the system were taken out. The test results show that the system can identify normal operation status of valve and pump, and locate pipeline leakage point under sudden condition with location error of less than 1%, which has stable and reliable operation.
Fault tolerant operation method of double winding WFSMs system in high power mine equipment
NIU Bing, ZHANG Hao, GUO Rongming, WU Xiaojie
2016, 42(10): 16-21. doi: 10.13272/j.issn.1671-251x.2016.10.004
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Abstract:
In order to ensure safe and reliable operation of high power mine equipment in fault condition, a fault tolerant operation method of double winding WFSMs system in high power mine equipment was proposed. First, double winding WFSMs mathematical model under two phase rotating coordinate system was set up, and air gap flux was selected as main magnetic field of vector control. Then, mixture gap flux observer of self-switching voltage and current model were built. On this basis, double WFSMs vector control system was designed based on primary and slave parallel drive mechanism, and changing relationship of the WFSMs system models in fault condition was pointed out, then active current correction mechanism was introduced to realize tolerant operation of double winding WFSMs. Finally, 2.5 MW mine hoist industrial field test results show that the proposed method can realize tolerant operation of the system in fault condition, and meanwhile guarantee dynamic and steady state performance of the WFSMs drive system.
Path planning of shearer up-drum based on virtual coal-rock interface
DONG Gang, MA Hongwei, NIE Zhen
2016, 42(10): 22-26. doi: 10.13272/j.issn.1671-251x.2016.10.005
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Abstract:
For the problem of shearer up-drum cutting rock in roof in the region where coal-rock interface is bended, a path planning method of shearer up-drum based on virtual coal-rock interface was proposed. The method defines virtual coal-rock interface which has repulsion to up-drum and virtual gravitational field, simulates moving process of shearer up-drum along the virtual coal-rock interface, calculates discrete points of cutting path through simulating the motion of shearer up-drum, and obtains a smooth cutting path of up-drum based on regression method of Gaussian kernel model and l2 constraint least square by training the discrete points. The simulation results show that cutting path of shearer up-drum planned by the method can avoid up-drum to cu rock in the region where coal-rock interface is bend effectively.
Influence analysis of coal and rock properties on roadheader cutting head load
LI Yuanyuan, WANG Haiyan, ZHU Qingqing, DONG Li, ZHONG Peisi
2016, 42(10): 26-29. doi: 10.13272/j.issn.1671-251x.2016.10.006
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Abstract:
roadheader; cutting head; coal and rock property; load analysis; firmness coefficient
Fault diagnosis research for full hydraulic braking system of trackless tyred vehicle
LIU Zhihai, YANG Kaidi, ZHANG Ronghua, LI Xiangqian, LI Jianzhong
2016, 42(10): 30-34. doi: 10.13272/j.issn.1671-251x.2016.10.007
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Abstract:
To solve problem that full hydraulic braking system of trackless tyred vehicle was prone to failure in harsh environment of coal mine, a fault diagnosis method based on support vector machine was proposed. The support vector machine regression estimate algorithm was applied to establish fault prediction model of the full hydraulic braking system, while pattern classification algorithm was used to isolate fault, and fault diagnosis tests and isolation experiments were carried out in Matlab environment. The experiment results show that it is entirely feasible to use fault diagnosis method based on support vector machine to diagnose fault of full hydraulic braking system of trackless tyred vehicle, which can improve fault detection efficiency and diagnostic accuracy.
Denoising method of vibration signal of roadheader based on the optimal wavelet basis selectio
LI Dongyu, TIAN Muqin, SONG Jiancheng, BAO Wenliang, MA Zhao
2016, 42(10): 35-39. doi: 10.13272/j.issn.1671-251x.2016.10.008
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Abstract:
In order to improve wavelet packet denoising effect for vibration signal of roadheader and avoid influence of noise on signal feature extraction mostly, the paper proposed a denoising method of vibration signal of roadheader based on the optimal wavelet basis selection. The method takes signal frequency spectrum as analysis basis, firstly determines the optimal decomposition layer number of wavelet packet, then selects the optimal wavelet basis function, so as to realize real-time processing of the vibration signal of roadheader with the best denoising effect. The field test results verify effectiveness of the method.
A novel line selection method of single phase grounding fault suitable for coal mine power network
WANG Qingliang, ZHAO Dongqiang, SHAO Lei, LI Zhong
2016, 42(10): 40-44. doi: 10.13272/j.issn.1671-251x.2016.10.009
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Abstract:
For problems that existing fault line selection methods for coal mine power network had low detecting sensitivity and were easily influenced by neutral point operation mode and electric arc at grounding point, characteristics of sequence current and harmonic current of single phase grounding fault were analyzed, and conclusions were gotten including that the fundamental negative sequence current was allotted to distribution system from grounding line head, and no fundamental negative sequence current flowed through health line head. According above conclusions, a novel line selection method of single phase grounding fault was proposed which took fundamental negative sequence current as the first criteria and harmonic current as the second criteria, and reliability analysis and simulation calculation about the method were taken out. The simulation results show that there is little influence on the method by neutral point operation mode and fault type, and the method has better reliability and adaptability compared with traditional methods.
Design of mine-used intrinsically safe wireless through-the-earth communication system
TIAN Xifang, LI Yunbo, XIAO Yong, HAN Chaochao
2016, 42(10): 44-47. doi: 10.13272/j.issn.1671-251x.2016.10.010
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Abstract:
The paper introduced structure and key technologies of mine-used intrinsically safe wireless through-the-earth communication system，and analyzed working principle of the system. The system uses low-frequency electromagnetic radiation technology, digital communication technology and intrinsically safe power supply technology, which has characteristics of smaller volume, lighter weight and easy operation. The test results of prototype show that the system has realized two-way through-the-earth communication for 50 m with communication rate of about 150 bit/s and bit error rate of no larger than 0.2 %, and has a certain practical value
Design of heat dissipation structure of host computer of mine through-the-earth communication based on heat pipe technology
WANG Kan
2016, 42(10): 48-51. doi: 10.13272/j.issn.1671-251x.2016.10.011
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Abstract:
In order to solve problem of heat dissipation of host computer of mine through-the-earth communication system, a heat dissipation structure of host computer of mine through-the-earth communication based on heat technology was designed. Transfer thermal resistance of dissipation structure of heat pipe is researched by numerical calculation method, and the calculation result is verified that the heat dissipation structure meets requirement of heat dissipation performance of the host computer. Finally temperature field cloud of the dissipation structure of heat pipe is obtained by numerical simulation method, and the simulation result coincides with the numerical result. Correctness of the design is verified by temperature monitoring test of a prototype.
Simulation experiment study on flame propagation regulation of gas explosion with roadway bend angle varying
ZHANG Weiguang, REN Xiaodong, CAI Changxuan
2016, 42(10): 52-56. doi: 10.13272/j.issn.1671-251x.2016.10.012
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Abstract:
In order to study flame propagation regulation after gas explosion accidents in coal mine, a gas explosion experiment system was designed and pipelines with different bend angles were used to simulate underground roadway varying. Relationship between flame propagation velocity in pipelines and pipeline bend angle or gas filling length was researched by experimental method. The experimental results show that the longer gas filling length is, the larger flame propagation velocity is; flame propagation velocity increases in horizontal section, quickly decreases at bend point and increases after bend point; with the same gas filling length, the larger turning angle is, the larger flame propagation velocity is; flame propagation velocity varying coefficient decreases firstly and then increases with pipeline bend angle increases, and gas filling length has no significant influence on the flame propagation velocity varying coefficient.
Design of fault isolation device of distribution networ
JING Dong, ZHANG Xiuhua, SUN Hongliang
2016, 42(10): 56-60. doi: 10.13272/j.issn.1671-251x.2016.10.013
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Abstract:
In view of shortages of refuse action or delay of traditional leakage protection device under fault of power distribution network, a fault isolation device of distribution network was designed. Inductance and adjustable capacitor in parallel are used to design impeder of the device, and coupling voltage generated by additional winding of the impeder to drive control system to switch adjustable capacitance rapidly, so as to realize on-line adjustment of isolation parameters accurately in fault condition. The simulation and experimental results show that the isolation device can offer high impedance, isolate fault point effectively, and guarantee safe and reliable operation of the distribution network when the power distribution network occur single-phase fault.
Application research of improved K-means leave one out method in rejecting of abnormal samples of coal near infrared spectrum
WANG Mi
2016, 42(10): 60-64. doi: 10.13272/j.issn.1671-251x.2016.10.014
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Abstract:
In view of problems of time-consuming, misjudgment of rejecting abnormal sample existed in current leave one out method, an improved K-means leave one out method was put forward for detecting and eliminating abnormal sample in coal quality analysis. Firstly, the method uses K-means clustering method to cluster samples, and gets suspicious samples; then it takes suspicious samples as a validation set, adopts leave one out method to do quadratic distinguishing, so as to eliminate abnormal samples. The experimental results show that the K-means leave one out method can eliminate abnormal samples quickly and accurately, and improves prediction accuracy of models.
Design of mine-used intrinsic safety ultrasonic ranging circuit system
KONG Weizheng, JIN Baoquan, WANG Yu, WANG Dong, ZHANG Hongjuan, GAO Yan
2016, 42(10): 65-69. doi: 10.13272/j.issn.1671-251x.2016.10.015
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Abstract:
The paper introduced composition and working mechanism of driving circuit and echo processing circuit of mine-used intrinsic safety ultrasonic ranging circuit system. By analyzing output voltage waveform, it calculated the maximum energy storage of each energy storage element in ranging circuit system. The experimental results show that the largest energy storage of each energy storage element is less than minimum ignition energy in ranging circuit system, which reaches stipulated intrinsic safety request of national standards.
A fault-tolerance topology of three-level four-leg NPC inverter
QIU Shiguang, LI Siguang
2016, 42(10): 70-73. doi: 10.13272/j.issn.1671-251x.2016.10.016
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In view of problem that it is difficult to accurately locate device failure of inverter, a fault tolerance topology of three-level four-leg NPC inverter was proposed. In the topology, short-circuit fault and open-circuit fault can be located accurately by switching device used when topology changes, so as to provide a basis for fault-tolerant control of inverter. The topology enables half-leg replacement, and can achieve fault-tolerant control of up to three inverter legs at the same time.
Study on internal strain and acoustic emission characteristics of loaded concrete
WANG Hao, WANG Xiaoran, LIU Xiaofei, LI Xuelong, ZHAN Tangqi
2016, 42(10): 74-78. doi: 10.13272/j.issn.1671-251x.2016.10.017
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Abstract:
order to study interior crack evolution rules in rupture and instability process of concrete specimen, uniaxial compression experiment of concrete specimen embedded with strain brick was conducted, variation rule of internal strain of the concrete specimen with time was studied, and acoustic emission signal characteristics of the samples in the evolution process of loading and fracture were measured and analyzed. The following conclusions are obtained: in the compaction stage, variables in different directions are small and acoustic emission count is low; in the stable crack propagation stage, the internal strain of samples increase stably, local strains in different directions are significantly different and acoustic emission signals also show a steady growth trend; when local fast rupture of concrete appears, strain and acoustic emission signal both increase suddenly; before the critical instability, local deformation increases rapidly and the acoustic emission signals increase dramatically; when fracture appears, local strains and acoustic emission pulse number in all directions reaches the peak.
Multi-channel digital audio communication system based on visible light transmissio
WU Yan, BEI Lulu, ZHANG Shen, LI Yi, SUN Wenda
2016, 42(10): 79-81. doi: 10.13272/j.issn.1671-251x.2016.10.018
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In view of problem of short transmission distance and high cost of existing point to point digital communications system, multi-channel digital audio communication system based on visible light transmission was designed and implemented by use of white LED. The system combines audio codec chip of TP3067 to implement multiplexing transmission of multi-channel audio signals, and uses FPGA as the main controller to control time slot of encoder signals. Experimental results show that the system can achieve transfer rate of up to 2.048 Mbit/s, and audio signal of up to 32-channels can be transmitted stably.
Dynamic discrimination method of gas security situation of stope face
LIU Yabing
2016, 42(10): 82-85. doi: 10.13272/j.issn.1671-251x.2016.10.019
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Dynamic discrimination method of gas security situation of stope face and six kinds of diversified evaluation indexes were proposed started from two major gas discharge forms of gas drainage and underground ventilation, and combining three major methane sources of adjacent layers gas emission, coal tunnel wall gas emission, and gas emission caused by coal drop. Dynamic discrimination method of gas security situation of stope face based on BP neural network was put forward too. Matlab validation results show that the method will follow the index to find the most optimized sequence when it discriminates relative changes of gas security situation of stope face, on the basis of given indicators, the method can accurately discriminates relative changes of gas security situation, but absolute discrimination results need to be judged specifically combined with sub-index values.
Research on predictive control for mine high-pressure three-level ANPC inverter
YU Jing, MO Xiuquan, XU Na
2016, 42(10): 85-90. doi: 10.13272/j.issn.1671-251x.2016.10.020
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A predictive control program for mine high-pressure three-level ANPC inverter based on predictive model control was proposed. The program uses current predictive control to achieve three-level ANPC high dynamic performance and unity power factor control, selects switching state corresponding to voltage vector according to switching device loss. For problem of intensive calculated amount, delay compensation control was adopted. The simulation and experimental results show that three-level ANPC rectifier adopting the proposed control scheme has fast dynamic response, good static and dynamic characteristics.
Unipolar deviation control algorithm and its application in mine hoist mechanical braking system
DENG Shijian, NING Ting, LIU Jie, GONG Weidong, PEI Jicheng
2016, 42(10): 91-94. doi: 10.13272/j.issn.1671-251x.2016.10.021
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A kind of unipolar deviation control algorithm was proposed and applied to mine hoist mechanical braking system. The algorithm can change a feedback control system from no error system to error system, which is beneficial to improve system stability and simplify system design; it can improve system dynamic property without changing system structure. In mine hoist mechanical brake system, the algorithm can be achieved by changing preset form, and was simple and practical.

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