Finite element analysis of internal excitation and structure borne noise in geared system

The internal excitation of geared system, included the excitation of time-variable stiffness, gear error and meshing impact. The excitation of time-variable stiffness and meshing impact were studied by using 3D static and dynamic contact finite element method respectively. The excitation of gear error was simplified into half sine function curve. Using I-Deas software, the solid model of total geared system including gear, shaft and housing is constructed, the finite element dynamic analysis model with 63180 nodes and 202488 elements of the total geared system is also established. Teen the curve of dynamic response in time domain, frequency-response curve and third octave reduction structure home noise based on acceleration of geared systems were studied with the theoretical modal analysis method combined with dynamic test technique.