Technical Brief

Integrated Mechanical and Thermodynamic Optimization of an Engine Linkage Using a Multi-Objective Genetic Algorithm

[+] Author and Article Information
Thomas A. Sullivan, Kieran McCabe

Department of Mechanical Engineering,
University of Minnesota,
Minneapolis, MN 55455

James D. van de ven

Assistant Professor
Department of Mechanical Engineering,
University of Minnesota,
Minneapolis, MN 55455
e-mail: vandeven@umn.edu

William F. Northrop

Assistant Professor
Department of Mechanical Engineering,
University of Minnesota,
Minneapolis, MN 55455

Contributed by the Design Automation Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received January 20, 2014; final manuscript received November 18, 2014; published online December 8, 2014. Assoc. Editor: Gary Wang.

J. Mech. Des 137(2), 024501 (Feb 01, 2015) (4 pages) Paper No: MD-14-1063; doi: 10.1115/1.4029220 History: Received January 20, 2014; Revised November 18, 2014; Online December 08, 2014

In order to improve the thermodynamic efficiency of an internal combustion engine (ICE), a Stephenson-III six-bar linkage is optimized to serve as a replacement for the traditional slider–crank. Novel techniques are presented for formulating the design variables in the kinematic optimization that guarantee satisfaction of the Grashof condition and of transmission angle requirements without the need for an explicit constraint function. Additionally, a nested generalization of the popular NSGA-II algorithm is presented that allows simultaneous optimization of the kinematic, dynamic, and thermodynamic properties of the mechanism. This approach successfully solves the complex six-objective optimization problem, with challenges for future refinement including improvement of the combustion simulation to attain better accuracy without prohibitive computational expense.

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Grahic Jump Location
Fig. 3

Determination of minimum connecting rod length

Grahic Jump Location
Fig. 4

Nested optimization structure

Grahic Jump Location
Fig. 5

Skeleton diagram of typical solution



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