Study on Acoustic Radiation Calculation and Far Field Criterion of Oil pan

Abstract

Diesel engine with low vibration and noise characteristics will be a major trend for the future development. As the shell part on the engine, the vibration and noise control of the oil pan is an urgent problem to be solved. It is of practical significance to predict the oil pan vibration and radiation noise during the design phase. An oil pan of diesel engine was taken as the research object, the finite element model of the oil pan was established and the finite element method (FEM) was used to calculate the oil pan vibration response. Three different numerical calculation methods (Finite element-boundary element hybrid method, finite element-infinite element hybrid method, finite element-automatic matching layer technology) were used to calculate radiated sound power level of the oil pan respectively. The calculation accuracy and efficiency of three different calculation methods were compared and analyzed. The results show that the finite element-boundary element method is more suitable for the calculation of the acoustic radiation of the oil pan. Finally, a method based on the directivity of acoustic radiation to determine the far-field acoustic radiation is proposed and verified.