Simulation of vibroacoustic gear noise transfer with FEM
* Präsentierender Autor
Zusammenfassung:Tonal sound is a critical issue in various mechanical systems, e.g. wind turbines and one major source are gearbox vibrations. These originates at mating gears and are transmitted via a complex system of vibro-acoustic transfer paths and radiated into the far-field by vibrating surfaces. A numerical investigation of the vibro-acoustic transfer can help to evaluate the acoustic effects, identify dominant transfer paths and indicate efficient design changes. Our approach is to determine the vibro-acoustic transfer at operating conditions with the following hybrid multi-stage approach: - Determine significant gear vibration source, e.g. varying mesh stiffness - Spare modeling of transient gear dynamics to obtain the excitation spectrum of thetransmission error TE(f), which is considered to be the dominant gear noise mechanism - Dynamic FE analysis with detailed models of the vibro-acoustic transfer paths (TP), to obtain relevant transfer properties in form of transfer functions - Calculation of the operational response spectrum from excitation spectrum and transfer functions, using linear combination and superposition.The model results for the radiated sound power level are compared with experimental test rig results. The main focus is on the mesh frequency of the high speed stage and its first two harmonics.