Title: Multi-objective optimisation of the engine connecting rod based on the response surface methodology

Authors: Bin Zheng; LinFei Zhou

Addresses: School of Intelligent Manufacturing, Panzhihua University, Panzhihua, 617000, China ' School of Intelligent Manufacturing, Panzhihua University, Panzhihua, 617000, China

Abstract: Aiming at the low efficiency and limitation of traditional methods in the optimisation design, an optimisation design method of the connecting rod is proposed. The static and dynamic are researched under typical working conditions. The five dimensional parameters of the connecting rod, namely, the small end depth, the shank depth, the arc length, the arc between the large end and shank, and the shank groove depth are chosen as design variables by using sensitivity analysis. The deformation, equivalent stress, and the natural frequencies are taken as target variables. Using Latin hypercube sampling, the sample points are obtained, and the mathematical model is fitted. The relationship is discussed through three-dimensional response surfaces. The solution is obtained by using a genetic algorithm. The results of optimisation show that without increasing the mass, the deformation, and equivalent stress decrease by 23.81% and 6.23%, respectively. In the meantime, the natural frequency increases by 6.79%, 3.14%, and 23.31%, respectively.

Keywords: connecting rod; finite element analysis; experimental design; numerical simulations; sensitivity analysis; response surface methodology; multi-objective optimisation.

DOI: 10.1504/IJCMSSE.2024.139009

International Journal of Computational Materials Science and Surface Engineering, 2024 Vol.12 No.1, pp.14 - 35

Received: 10 May 2023
Accepted: 20 Sep 2023
Published online: 07 Jun 2024 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article