. .. Conclusion,

, Les mesures réalisées avec le microphone ne permettent pas d'évaluer correctement la pression acoustique induite par le balai, en raison des nombreuses sources acoustiques secondaires liés au fonctionnement du banc d'essais qui parasitent le signal (moteur, roulements

, Evolution temporelle de la pression acoustique au cours d'un cycle à 6000 tr/min -Nuance J, vol.25

. Néanmoins,

, Densité spectrale de puissance de la vitesse vibratoire au cours d'un cycle à 6000 tr/min. Mesure sur balai (rouge) -Mesure sur le, vol.29

, Si on suppose que le balai se comporte comme un piston vibrant rayonnant à l'intérieur du carter, l'équation 3.32 du chapitre 3 permet d'estimer la puissance acoustique émise directement par le balai, au facteur de rayonnement près

, Pour une vitesse de rotation du motoréducteur de 6000 tr/min, on obtient une puissance émise par balai égale à 68 dB. L'application d'un filtre A permet d'atténuer l'impact des fréquences très faibles

. Néanmoins,

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