Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/9951
Title: Modeling and optimization of biodiesel engine performance using advanced machine learning methods
Authors: Wong, KI
Wong, PK
Cheung, CS 
Vong, CM
Keywords: Biodiesel
Engine modeling
Engine optimization
Engine performance
Machine learning
Issue Date: 2013
Publisher: Pergamon Press
Source: Energy, 2013, v. 55, p. 519-528 How to cite?
Journal: Energy 
Abstract: This study aims to determine optimal biodiesel ratio that can achieve the goals of fewer emissions, reasonable fuel economy and wide engine operating range. Different advanced machine learning techniques, namely ELM (extreme learning machine), LS-SVM (least-squares support vector machine) and RBFNN (radial-basis function neural network), are used to create engine models based on experimental data. Logarithmic transformation of dependent variables is used to alleviate the problems of data scarcity and data exponentiality simultaneously. Based on the engine models, two optimization methods, namely SA (simulated annealing) and PSO (particle swarm optimization), are employed and a flexible objective function is designed to determine the optimal biodiesel ratio subject to various user-defined constraints. A case study is presented to verify the modeling and optimization framework. Moreover, two comparisons are conducted, where one is among the modeling techniques and the other is among the optimization techniques. Experimental results show that, in terms of the model accuracy and training time, ELM with the logarithmic transformation is better than LS-SVM and RBFNN with/without the logarithmic transformation. The results also show that PSO outperforms SA in terms of fitness and standard deviation, with an acceptable computational time.
URI: http://hdl.handle.net/10397/9951
ISSN: 0360-5442
EISSN: 1873-6785
DOI: 10.1016/j.energy.2013.03.057
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