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Gearbox as an important source of noise and vibration, its structure-borne nois e has drawn more and more attentions and has become an important investigation t opic. The gearbox is extremely complicated mechanical equipment. In general, the profiles of gear teeth are not perfect. Together with the time-varying stiffne ss during tooth mesh, an in-plane force will be induced at the rim of a rotatin g gearwheel, which creates the vibration. These vibrations are transmitted throu gh the shafts, the bearings, and finally to the gearbox. At the same time, they will produce air-borne noise during tooth mesh, which radiate directly to the g earbox and through the gearbox radiate to the neighboring environment. In this paper, the overall dynamics of a gear system that includes a spur gear p air, shafts, bearings and a flexible gearbox is investigated. At first, the gear ed rotor system comprising gears, shafts, bearings and gearbox is set up and sim plified into a Source-Path-Receiver (SPR) model. Here, the rotating system inc luding the gears, shafts, primer mover and load is considered as the Source whil e the gearbox is regarded as the receiver and the bearings are treated as the Pa th. The dynamics of the SPR model is analyzed and the power flow transmitted fro m the source to the receiver is derived. Then the geared motor system is studied by finite element method (FEM), and corresponding mobility matrices are built b y choosing proper FEM model. Based on these data and the bearing’s mobility mat rix, the overall model of gearbox is developed using the component mobility meth od. At last the power flow transmission properties between substructures or subs ystem of gearbox are studied from the viewpoint of energy. The result will provi de the reliable computational foundation for improving the gearbox’s dynamical performance.
Gearbox as an important source of noise and vibration, its structure-borne nois e has been drawn more and more attentions and has become an important investigation t opic. In general, the profiles of gear teeth are not perfect Together with the time-varying stiffne ss during tooth mesh, an in-plane force will be induced at the rim of a rotatin g gearwheel, which creates the vibration. These vibrations are transmitted throu gh the shafts, the bearings, and finally to the gearbox. At the same time, they will produce air-borne noise during tooth mesh, which radiate directly to the g earbox and through the gearbox radiate to the neighboring environment. The first gear the rotor system includes gears, shafts, bearings and gearbox is set up and sim plified into a Source-Path-Receiver (SPR) model. Here, the rotating system inc luding the gears, shafts, primer mover and load is considered as the Source whil e the gearbox is considered as the receiver and the bearings are treated as the Pa th. The dynamics of the SPR model is analyzed and the power flow transmitted fro m the source to the receiver is derived. [0013] The geared motor system is studied by finite element method (FEM), and the corresponding mobility matrices are built by choosing proper FEM model. Based on these data and the bearing’s mobility mat last, the overall model of gearbox is developed from the component mobility meth od. at last the power flow transmission properties between substructures or subs ystem of gearbox are studied from the viewpoint of energy. The result will provi de the reliable computational foundation for improving the gearbox’s dynamical performance.