Thermal Stress Analysis of Ceramic-Coated Diesel Engine Pistons Based on the Wavelet Finite-Element Method

Abstract

To analyze the thermal stress distribution of ceramic-coated pistons, the wavelet finite-element was constructed by using the Daubechies wavelet scale function as the interpolating function. The thermal stress distributions of the conventional and ceramic-coated diesel engine pistons were obtained, respectively. The calculated results obtained by wavelet finite-element method were compared with test results and the simulation results gained by ANSYS software. Through analyzing the calculation results, the wavelet finite-element method was convergent and had higher analysis precision than the traditional finite-element method. The wavelet finite-element method avoids the numerical oscillation during analysis of the transient-state thermal stress fields of the piston. The wavelet finite-element method showed advantages for analyzing the high gradient problems. The wavelet finite-element method provides a preferable theoretical basis for optimizing the design of the ceramic-coated diesel piston.