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GIBBS, B. M. Machines and machine components as structure: borne sound sources. In: CONGRESSO IBEROAMERICANO DE ACÚSTICA, SIMPÓSIO DE METROLOGIA E NORMALIZAÇÃO EM ACÚSTICA E VIBRAÇÕES DO MERCOSUL, 1998, Florianópolis. Anais... Florianópolis, 1998.
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Abstract

The structure-borne sound power delivered by a vibrating machine into a supporting structure or by a machine component into the machine housing is determined by both the activity of the source of vibration and the dynamic structural characteristics at the contacts. It is a relatively simple matter to measure activity in the form of velocity at the contacts of the firee source under normal operating conditions. The structural dynamics are not so easy to calculate or measure. However, visual inspection of the measured point force mobility ai the contact points of the source can give engineering insights on how best to treat multi-point and multi-component sources. Measured mobility data from a range of machine bases is described and à is confirmed that contacts display rigid body, stiffness controlled or resonance controlled characteristics, depending on frequency. The stiffiness controlled region is described in detail in order to confirm the generality of the relationship between point and transfer mobilities and the simplifications which result. The role of other components of excitation, including moments, also is described by considering their contribution to the total emission when the source is assumed attached to idealised plate structures.
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