基于人工神经网络的气体泄爆最大超压预测研究

Study on prediction of maximum overpressure in gas explosion venting based on artificial neural network

为解决传统经验公式在预测气体泄爆中最大超压出现时的较大偏差或过于保守的问题,提出使用人工神经网络预测气体泄爆最大超压。基于124组实验数据,采用BP与RBF神经网络,通过优化算法计算与迭代循环对泄爆样本中的影响因素进行降维与选择,并确定2类神经网络本身在学习与计算气体泄爆样本时的相关参数。结果表明:PCA(主成分分析法)在当前样本条件下的降维效果较差,而通过迭代对比确认气体泄爆样本中的5类特征全部保留时神经网络的训练模拟效果最好;通过对124组实验数据进行随机挑选训练集与测试集的训练模拟结果发现,神经网络对气体泄爆中最大超压的预测效果较好;通过对比Molkov提出的和经Fakandu等改进的NFPA 68经验公式以及2类神经网络的预测结果表明,神经网络相比于传统气体泄爆经验公式具有明显优势。

In order to solve the problem of large deviation or too conservative results when predicting the maximum overpressure in gas explosion venting by using the traditional empirical formulas,it was proposed to predict the maximum overpressure in gas explosion venting by using the artificial neural network.Based on 124 groups of experimental data,the BP and RBF neural network were adopted to carry out the dimensionality reduction and selection on the influence factors of explosion venting samples through the optimization algorithm calculation and iteration loop,then the relevant parameters of two kinds of neural networks when learning and calculating the gas explosion venting samples were determined.The results showed that the effect of dimensionality reduction by PCA under the current sample conditions was poor,while through the iterative comparison,it was determined that the training simulation effect of neural network was the best when all the five kinds of features in the gas explosion venting samples were preserved.According to the training simulation results of training sets and testing sets randomly selected from 124 groups of experimental data,it was found that the neural network had good prediction effect on the maximum overpressure in the gas explosion venting.After comparing the prediction results of two empirical formulas,one was proposed by Molkov,the other was proposed in NFPA 68 and improved by Fakandu et al.,as well as the prediction results of two kinds of neural network,it showed that the neural network had obvious advantage compared with the traditional empirical formulas of gas explosion venting.