Modeling and optimization of biodiesel engine performance using kernel-based extreme learning machine and cuckoo search. (February 2015)

• Record Type: Journal Article
• Authors: Wong, Pak Kin; Wong, Ka In; Vong, Chi Man; Cheung, Chun Shun
• Is Part Of: Renewable energy. Volume 74(2015)
• Page Start: 640
• Page End: 647
• Publication Date: 2015-02
• Subjects: Biodiesel -- Engine optimization -- Kernel-based extreme learning machine -- Cuckoo search; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2014.08.075
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: This study presents the optimization of biodiesel engine performance that can achieve the goal of fewer emissions, low fuel cost and wide engine operating range. A new biodiesel engine modeling and optimization framework based on extreme learning machine (ELM) is proposed. As an accurate model is required for effective optimization result, kernel-based ELM (K-ELM) is used instead of basic ELM because K-ELM can provide better generalization performance, and the randomness of basic ELM does not occur in K-ELM. By using K-ELM, a biodiesel engine model is first created based on experimental data. Logarithmic transformation of dependent variables is used to alleviate the problems of data scarcity and data exponentiality simultaneously. With the K-ELM engine model, cuckoo search (CS) is then employed to determine the optimal biodiesel ratio. A flexible objective function is designed so that various user-defined constraints can be applied. As an illustrative study, the fuel price in Macau is used to perform the optimization. To verify the modeling and optimization framework, the K-ELM model is compared with a least-squares support vector machine (LS-SVM) model, and the CS optimization result is compared with particle swarm optimization and experimental results. The evaluation result shows that K-ELM can achieve comparable performance to LS-SVM, resulting in a reliable prediction result for optimization. It also shows that the optimization results based on CS is effective. Highlights: A new modeling framework with optimization of biodiesel ratio for diesel engines. A new application of kernel-based extreme learning machine to biodiesel engine modelling. A first application of cuckoo search to biodiesel engine optimization problem. A flexible objective function for multi-objective optimization of biodiesel ratio. A comparison of various techniques for biodiesel engine modeling and optimization problem.