Simulation analysis on engine radiated noise

In this paper, in order to analyze and predict surface radiated noise, an engine with 6 cylinders is studied by advanced methods. The loads that the engine block is subjected and the modal participation factors can be obtained through multi-body dynamics calculation; by the finite element method, structural modes of the engine can be gotten; by the acoustic boundary element method and the modal acoustic transfer vector method, the acoustic responses on field points can be obtained. According to the simulation results, the acoustic power and the acoustic pressure distributions on field points and noise frequency characteristic can be identified when the engine is operating at different speeds, and the main noise source can be located. These results provide a reference for noise reduction and amelioration of the engine.