Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education

Fuxin, China

Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education

Fuxin, China
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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.


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.


Li Z.-X.,LIAONING Technical University | Li Z.-X.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Wang T.-M.,LIAONING Technical University | Jia J.-Z.,LIAONING Technical University | Jia J.-Z.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2013

A mathematical model was established based on numerical simulation of one-dimensional finite element method. The computer simulation program was designed. Analysis of the propagation progress of exogenous gas in ventilating roadways was done by computer simulation system. The calculation shows that if the concentration gradient of exogenous gas is too huge, the convection item becomes too strong, and the discretization time and the scale of space subdivision are too large, which leads to "cloud" distortion in the gas dispersion of front airflow. The distortion phenomenon tends to disappear after improving the algorithm, namely adopting a format of upwind finite element, adjusting upwind factor by the computer program automatically, and decreasing the subdivision scale of "time-space discretization". After these treatments, a good convergence effect is obtained when the airflow velocity is 2.252 m/s and division scale less than 2.5 m. We bring the algorithm of single branch into network solver of mine ventilation, and the simulation expression of the spreading and diffusion of exogenous gas in a network is achieved.


Li Z.-X.,LIAONING Technical University | Li Z.-X.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Wang S.-Y.,LIAONING Technical University | Wang S.-Y.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

Aiming at the problem of the computation of ventilation heat resistance in a roadway during mine fire, to the ventilation roadways with airflow temperature and density variation, a normative computing formula was deduced. It was pointed out that according to generalized ventilation principle, the ventilation resistance during mine fire includes frictional resistance and local resistance, as well as an additional resistance caused by the external ventilation source, namely fire smoke. In the new formula, the computation of ventilation resistance is expressed from two media, namely fluid and roadway, and the conception of roadway geometry air resistance were introduced. Geometry air resistance is the resistance characteristic of roadway itself, and it has nothing to do with fluid. Geometry air resistance includes frictional resistance and local resistance too. Conceptually, the new formula has a clear discrimination to the essence of heat resistance, so the mistakes easily appear during computation and analysis will be avoided. The conclusion that the ventilation resistance of high temperature smoke flow is in direct proportion to fire temperature was drawn. To verify the heat flow resistance effect, an experimental pipeline facility was designed to determine the variation of heat resistance with temperature. The experimental results are identical to the conclusion drawn from theoretical derivation. The additional resistance of exogenous smoke flow was extracted successfully by using the experimental facility. Experimental results show that exogenous resistance is the physical image of combustion process. A practical method for computing the heat resistance with the participation of exogenous gas is provided.


Chen X.,LIAONING Technical University | Chen X.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Ge S.-C.,LIAONING Technical University | Ge S.-C.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

In order to study the spray characteristics affected by induced airflow on the transshipment point, the discrete phase particle tracking technology based on the CFD theory was used to investigate the distribution characteristics of droplets in different induced airflow conditions. The results show that with the influence of induced airflow, the phenomenon of droplets drifting to guide chute exit is obvious. The two widely used statistics items D[3, 2] and D[4, 3] decrease with the increase of velocity of induced airflow, and the average decreases are 17.17% and 16.19% respectively. At the same time, with the increase of atomization pressure, the strength of secondary breaking is enhanced, which leads to the decrease of the atomized particle size. According to the above conclusions, the high-pressure spray system on the transshipment point can be improved. The spray pressure was increased from 1.5 MPa to 6.2 MPa, and the angle between the axial cross section of atomization field and induced airflow was adjusted to the degree of 30°. The experiment results show that the total dust concentration and respirable dust concentration are reduced by 88.60% and 78.96% respectively on the transshipment point after the improvement of the spray system. ©, 2015, Meitan Xuebao/Journal of the China Coal Society. All right reserved.


Li Z.-X.,LIAONING Technical University | Li Z.-X.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | Wang Y.-D.,LIAONING Technical University | Wang Y.-D.,Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

The mathematical model of disaster process in mine ventilation system during mine fire period was built based on source-containing ventilation network and previous fire studies, and the software TF1M(3D) was developed based on MATLAB. Combined with the typical mine ascensional airflow fire example, the airflow movement during fire period, the distribution of fume concentration and temperature, the ventilation system variations were simulated in a whole mine scale. Simulation results show that the air quantity in main airway increases with fire when ascensional airflow fire occurred in mine, while the airflow in the side branch of fire source decreases, stagnate and reverse; driven by fire burning power (fire ventilation pressure), overflowing quantity and reverse air quantity have consistent symmetry; and in complex ventilation network, reverse airflow in side branch orderly occurs. A series of changes of ventilation system during fire period are all produced by the interaction of ventilation power and fire ventilation pressure, which also lead to the dynamic drift of mine system total wind drag. This paper provides the relationship between fire severity and wind drag drift value. The software TF1M(3D) offers a good platform for analyzing mine fire because of its large amount of information, good animation and intuitive phenomenon. ©, 2015, China Coal Society. All right reserved.


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
Yingyong Lixue Xuebao/Chinese Journal of Applied Mechanics | Year: 2016

In order to investigate the influence of the vibration produced by running high-speed trains on the structural reliability degradation of reinforced concrete bridge, to analyze the age, availability, and probability of ultimate failure of the bridge, the Renewal Theory-based Life-cycle Analysis is adopted to simulate the bridge structural reliability degradation process. In the simulation of the deteriorating process the bridge is considered to be maintainable and deteriorating is assumed to be produced by vibration only from the running trains. The results show that the failure probability values affect the system availability, life, the limit of system failure probability, with the same trend as reported in existing literatures. For the bridge analyzed with mentioned parameters in the article, the limit of system failure probability reaches the stabilization in about 120 years, the smaller system failure probability is advantageous to the long-term use of bridge structure, the fluctuation period of obvious deteriorating can be expected to be 30 to 40 years. © 2016, Editorial Department of CJAM. All right reserved.


Li Y.C.,LIAONING Technical University | Li Y.C.,Key Laboratory of Mine Thermodynamic disasters and Control of Ministry of Education | Yang Y.M.,LIAONING Technical University | Yang Y.M.,Key Laboratory of Mine Thermodynamic disasters and Control of Ministry of Education
Applied Mechanics and Materials | Year: 2014

This study analyses the Fushun oil shale semi-coke samples prepared in 450°C, 550°C and 650°C by using STA449 TGA. The experiment studied their ignition points, concluded that with the ascent of the char-making-temperature the semi-coke’s ignition point is getting higher. The test used Coats-Redfern way to study the semi-coke’s activation energy. The result shows the semi-coke’s thermal dynamic model needs two different reaction orders in different temperature. In low temperature the reaction order is n=1; in high temperature it is n=3. When the temperature is low (n=1), the activation energy doesn’t influenced by the heating rate. In high temperature condition the activation energy is getting bigger with the ascent of the heating rate. © (2014) Trans Tech Publications, Switzerland.


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.


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 research the mean failure times of repairable systems in imperfect repair state, Kijima's virtual age model based on the generalized renewal process (GRP) is improved to describe imperfect repair model. The correlative parameters of the process are estimated with maximum likelihood estimation. First failure time and subsequent failures times are obtained by Monte Carlo (MC) simulation. The mean failure times of system is calculated in imperfect repair state and different time. The data follows the Weibull distribution and literatures are combined to simulate according to the model. The mean failure times from that imperfect repair model, perfect repair model and general repair model are compared in different respectively. The results show that before 7000 h, the mean failure times of system is determined with imperfect repair model; after 7000 h, the mean failure times of system is determined with the mean value of imperfect repair model and general repair model. © 2016, Systems Engineering Society of China. All right reserved.

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