Characteristic time scale as optimal input in Machine Learning algorithms:Homogeneous autoignition  

作　　者：Mohammed I.Radaideh Stelios Rigopoulos Dimitris A.Goussis 

机构地区：[1]Department of Mechanical Engineering,Khalifa University of Science and Technology,Abu Dhabi 127788,United Arab Emirates [2]Imperial College London Mechanical Engineering South Kensington Campus London,SW72AZ,United Kingdom [3]Research and Innovation Center on CO_(2)and H_(2),Khalifa University of Science and Technology,Abu Dhabip,127788,United Arab Emirates

出　　处：《Energy and AI》2023年第4期238-252,共15页能源与人工智能（英文）

摘　　要：Considering temporally evolving processes,the search for optimal input selection in Machine Learning(ML)algorithms is extended here beyond(i)the readily available independent variables defining the process and(ii)the dependent variables suggested by feature extraction methods,by considering the time scale that characterizes the process.The analysis is based on the process of homogeneous autoignition,which is fully determined by the initial temperature T(0)and pressure p(0)of the mixture and the equivalence ratio𝜙that specifies the initial mixture composition.The aim is to seek the optimal input for the prediction of the time at which the mixture ignites.The Multilayer Perceptron(MLP)and Principal Component Analysis(PCA)algorithms are employed for prediction and feature extraction,respectively.It is demonstrated that the time scale that characterizes the initiation of the process𝜐𝑓(0),provides much better accuracy as input to MLP than any pair of the three independent parameters T(0),p(0)and𝜙or their two principal components.Indicatively,it is shown that using𝜐𝑓(0)as input results in a coefficient of determination R 2 in the range of 0.953 to 0.982,while the maximum value of R 2 when using the independent parameters or principal components is 0.660.The physical grounds,on which the success of𝜐𝑓(0)is based,are discussed.The results suggest the need for further research in order to develop selection methodologies of optimal inputs among those that characterize the process.

关 键 词：Machine Learning Feature selection AUTOIGNITION 

分 类 号：O17[理学—数学]