Noise and vibration prediction is the ideal control, requiring an analytical model of the entire system of gear transmission as the links and all connected structures, because each component can have a significant effect on the dynamics of transmission. Gears and shafts vibration produce reaction forces to the bearings which are responsible for the transfer of excitations moving from gear to the housing. Knowing the nature of these forces and their transfers can certainly control and predict the vibration and noise of transmission boxes. The technique used for the calculation of acoustic radiation transmission by cylindrical spur gears, considered closed and open is based on the model of C. Marquis. We proceed to the construction of its vibroacoustic transfer function, the Green function is built digitally from the experimental data obtained in some potential point sources distributed over the transmission giving the complex vibratory velocities and points of space surrounding the transmission characterizing the radiated field given by the complex acoustic pressure. This method has the advantage of not requiring exact knowledge of the gear transmission geometry. But we are faced with solving the inverse problem, so the regularization is required to meet the solution, which will be introduced by the singular value decomposition (SVD) and regularization parameters. The experimental application of the chosen technique for studying the radiation gear transmission was made in the LVA at INSA Lyon and placed in a semi-anechoic room. The acoustic radiation prediction will be made for the same vibratory state represented by the rotation speed. The results will be presented in the form of spectra giving the pressure and power sound levels, as well as maps distribution. These results will be compared with the experimental measures. Vibroacoustic transfer function constructed by the proposed approach will be used in the monitoring, the gear defaults diagnosis etc.
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