In this paper, the two main acoustic sources of a gear pair radiating in free space are investigated. First, a model of the fluid-pumping noise source is proposed, which takes into account the effects of the meshing frequency and of some geometrical parameters of the gear. Then, analytical and numerical results regarding the vibroacoustic behaviour of the gear wheels are exposed. It is found that harmonic excitation in the region of tooth contact leads to a non-harmonic vibratory response of the wheels due to their rotation, but that the noise heard in a global coordinate system is harmonic. The influence of the rotation speed on the acoustic properties of the wheels is described. [References: 20]
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