Research of the Possibilities of Predicting the Structure-Borne Noise of a Diesel Engine when Changing its Design Using Modeling in the AVL EXCITE Software

Modern software systems for modeling noise and vibrations of an internal combustion engine allow us to take into account the design features of its body parts, which improves the quality of vibroacoustic studies. The article presents the methodology and results of modeling the noise of a 4-cylinder diesel engine when changing the design of its oil pan using the AVL EXCITE software package. The difference between the contributions of the surfaces of individual engine parts to the overall level of its sound power for the investigated variants of the oil pan design is shown. Analysis of the results of calculating the structure-borne noise of diesel in nominal mode showed that the change in the design of the oil pan led to a redistribution of the frequency composition of the sound power spectrum: the amplitudes of harmonics in the high frequency range increased, and the overall level increased by 2 dBA.