【摘 要】
：
In order to predict the danger of coal and gas outburst in mine coal layer correctly,on the basis of the VLBP and LMBP algorithm in Matlab neural network toolbox.one kind of modified BP neural network was put forth to speed up the network convergence spee
【机 构】
：
College of Energy and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,
论文部分内容阅读
In order to predict the danger of coal and gas outburst in mine coal layer correctly,on the basis of the VLBP and LMBP algorithm in Matlab neural network toolbox.one kind of modified BP neural network was put forth to speed up the network convergence speed in this paper.Firstly,according to the characteristics of coal and gas outburst.five key influencing factors such as excavation depth,pressure of gas,and geologic destroy degree were selected as the judging indexes of coal and gas outburst.Secondly,the prediction model for coal and gas outburst was built.Finally,it was verified by practical examples.Practical application demonstrates that,on the one hand,the modified BP prediction model based on the Matlab neural network toolbox can overcome the disadvantages of constringency and,on the other hand,it has fast convergence speed and good prediction accuracy.The analysis and computing results show that the computing speed by LMBP algorithm is faster than by VLBP algonthm but needs more memory.And the resuits show that the prediction results are identical with actual results and this model is a very efficient prediction method for mine coal and gas outburst,and has an important practical meaning for the mine production safety.So we conclude that it can be used to predict coal and gas outburst precisely in actual engineering.
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