Optimal design apply to orthogonal test in piston with bionic groove

This paper uses some type engine as the research object. Inspired by soil animal earthworms of the biological world and friction reduction movement of groove shape, we process grooves in the engine piston skirt´s surface. Based on the standard piston´s stress distribution, this paper has made nine test plans with the orthogonal experiment method. The boundary conditions of load are theoretically calculated, which apply to finite-element analysis. Then obtained three indexes, they are maximum distortion, maximum stress and maximum load of piston skirt. Comprehensive balance analysis is used in test indexes of optimization design. Finally primary and secondary factors are got, that rank is hole and groove distribution pattern (A) - groove depth(B) - groove wide(C). Optimal level is A2B3C1.