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Jia B.-S.,LIAONING Technical University | Jia B.-S.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Wen H.-Y.,LIAONING Technical University | Wen H.-Y.,Urban Institute | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

In order to determine the effect of inert gas (N2 and CO2) on the process of methane premixed explosion in coal mine roadways, the detailed reaction mechanisms (include 53 mixtures, and 325 reactions) were investigated in this study. The mathematical model of methane explosion in the coal mine roadway was developed using the PREMIX code of CHEMKIN 3.7 chemical kinetics packages. Through numerical computation, the change currents of reactant and free radical concentration, catastrophic gases generated from methane explosion and total consumption rate of methane were compared, due to the effect of N2 and CO2 on methane explosions, and the similarities and differences were also analyzed. The results show that CO2 is more effective than N2 in lowering the concentration of activation center during the reaction system and main catastrophic gases of CO and NO resulting from methane explosion. Therefore, it concludes that: CO2 is more effective than N2 in inhibiting methane explosion. Source


Cui T.,LIAONING Technical University | Cui T.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Cui T.,Dalian Jiaotong University | Ma Y.,Dalian Jiaotong University
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2016

In order to understand the bigger difference reason between the failure probability spatial distribution by factors projection fitting method in DSFT and relatively accurate result by CSFT, the calculating process of this method is analyzed again to understand the reasons of the imprecision. It is found that the determination of the characteristic functions Pt i (t) and Pc i (c) of working time t and working temperature c is not accurate. To rebuild these two functions, the new expressions of the characteristic functions were obtained through a series of derivation. Contrast analysis shows that the function linear of the method is the same as the real result, except degree of scaling and translation quantity, so there is still practical significance. c0 and t0 as independent variables to form a group of family function, but because of the lack of constraints, c0 and t0 are still unable to determine the specific numerical value. © 2016, Editorial Board of Journal of Systems Engineering Society of China. All right reserved. Source


Cui T.,LIAONING Technical University | Cui T.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Cui T.,Dalian Jiaotong University | Ma Y.,Dalian Jiaotong University
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2016

In order to make full use of existing long-term monitoring of component fault recording data, in the production process of industry and mining, the discrete space fault tree (DSFT) is put forward for processing the data. The method for failure probability space distribution is proposed based on DSFT, namely the factors projection fitting method and ANN method. Implementations of the two methods are put forward. Considering the component failure impact because of the working time t and working temperature c, on a range of c: 0~40℃ and t: 0~50 day, the failure probability space distributions are studied. The results are compared with that of CSFT. Comparative analysis shows that: using ANN in DSFT, the prediction results are more close to the relatively real results with CSFT than using DSFT factors projection fitting method. In the case of only the monitoring data without clear system structure, these two methods can be used, but the ANN method is more accurate. © 2016, Editorial Board of Journal of Systems Engineering Society of China. All right reserved. Source


Cui T.-J.,LIAONING Technical University | Cui T.-J.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Cui T.-J.,Dalian Jiaotong University | Ma Y.-D.,Dalian Jiaotong University
Jisuan Lixue Xuebao/Chinese Journal of Computational Mechanics | Year: 2016

To understand the process of discontinuity collapse of high-rise buildings and its characteristics, induced by the impact of large high-speed object, the process of collapse is simulated based on PFC3D as a platform. The high-rise building of the frame-core tube is considered model. The object is composed of three particles, the impact speed of 720 km/h, height of 250 m and 100 m building side. The characteristics of the movement of the object into the interlayer are studied, and the collapse of the process with two kinds of impacted high. The simulation results show that the overall destruction of building would not happen when the object not directly impact the core tube, the core tube damage is the key to building collapse. The collapse impact of building heights can be divided into two stages; their phenomenon and reason are not identical. The three differences in the process of collapse between building heights and building lower are put forward. In the final, the ground influences the scope and characteristics after © 2016, Editorial Office of Chinese Journal of Computational Mechanics. All right reserved. Source


Cui T.-J.,LIAONING Technical University | Cui T.-J.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Cui T.-J.,Dalian Jiaotong University | Ma Y.-D.,Dalian Jiaotong University
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2015

In order to apply the factor spaces and factor data-bases from Peizhuang WANG to the actual research, according to the characteristics of the theory, the conceptual analysis and reasoning ability of the theory are employed to deal with the status that safety analysis of coal mine is mostly qualitative discussion. The coal mine safety situation is reasoned and reduced with the conceptual analysis table. The above method is used to reduce the influence on the safety assessment of qualitative from redundant information. The concise and accurate safety concept is obtained to distinguish between different safe situations of coal mine. The results show that under the invariable of the research object set U and factor set F, the divided concept lattice is not the same by different factors sorted. Under the initial safety description, the more simplified concept lattice can be get through reasonable arrangement of factors and remove the imaginary part. With factor spaces and factor data-bases, the reasoning and reduction of the safety concept is feasible, it can be used to distinguish the difference of multiple mining safety situation, the classification and comparison. © 2015, Systems Engineering Society of China. All right reserved. Source

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