GDN-22 EXPERIMENTAL VIBRATION ANALYSIS OF GEAR-SHAFT-BEARING SYSTEM ON AUTOMATIC TRANSMISSION (EXPERIMENTAL RESULT BY TORSIONAL EXCITATION USING ELECTRIC EXCITER)(GEAR DYNAMICS AND NOISE)

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Recently, going with interior noise reduction in a vehicle, gear noise which is of pure frequency has been becoming a great influence on the comfortable driving. For the purpose of reducing the gear noise, (1) the source of gear noise (the transmission error of gears) and (2) the dynamic characteristics of gear-shaft-bearing system (the transfer of vibration) must be clarified and those influences should be taken into the account in design process. In this paper, the procedure which coped with the gear noise peak coming up during the development period of automatic transmission is introduced. The procedure could clarify the influence of the transfer characteristics analytically and experimentally as well. The vibration analysis with the gear-shaft-bearing system model was carried out to estimate the resonance of the gear noise peak which was remarkable in the vehicle. In order to confirm the analytical preciseness the torsional excitation experiments with the actual automatic transmission were carried out. At the first, for the sake of simplicity of the experiments and analysis, the automatic transmission remaining the dominant parts for the gear meshing and transferring its vibration to the case was prepared. Necessary accelerometers were set up in the gear-shaft-bearing system. The input-shaft was excited in torsional direction by electric exciter while applying the static torque to the drive train, then the vibration characteristics of gear-shaft-bearing system were obtained. As a result, it was found by the simulation and experiments that some gear noise peaks were recognized as resonances, and could be reduced by modifying bearing stiffness and its damping characteristics.
一般社団法人日本機械学会の論文
2001-11-15

GDN-22 EXPERIMENTAL VIBRATION ANALYSIS OF GEAR-SHAFT-BEARING SYSTEM ON AUTOMATIC TRANSMISSION (EXPERIMENTAL RESULT BY TORSIONAL EXCITATION USING ELECTRIC EXCITER)(GEAR DYNAMICS AND NOISE)

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