Integrated Virtual-Design Methods for Predicting Radiated Noise of Cylinder Block of a Single Cylinder Diesel Engine

By setting up the flexible assembly of the Cylinder block and cranktrain based on the hybrid mult-body dynamics simulation,this paper obtained dynamical loads,such as the main bearing load and the piston thrust load,applied on the cylinder block of a single cylinder diesel engine whithin two cycles.The finite element analysis model of the cylinder block was validated by modal test.By using the loads distribution obtained from simulating,the frequency response of the cylinder block was calculated by the finite element method(FEM).Finally,the radiated noise of the cylinder block,including sound power level and efficiency,was obtained using the direct boundary element method(BEM).