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This paper presents an active bearing for reducing the radiated structure borne noise of rotating machinery.
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The basic idea behind this new technology is to modify or reduce the vibration of a radiating structure to diminish the radiated sound.
The results presented show that significant progress has been made towards controlling structurally radiated noise by active/adaptive means applied directly to the structure.
Through these displacements the radiated power by the structure as well as the energy stored are quantified.
Experimental results show that the method accurately predicts the effect of design changes on the structure's radiated sound power.
To calculate the radiated noise from vibrated structure including thin bodies, the conventional boundary element method (BEM) using the Helmholtz integral equation is not an effective resolution.
Internal resonances within vibration isolators have been shown to increase force transmission and consequently radiated noise from supporting structures.
Structurally radiated sound power is a critical design parameter.
Projections of total wayside noise are obtained by combining the structure-radiated and direct train noise.
Results confirm that both the direct and the structure-radiated noise must be adequately attenuated to conform to the NCO.
Since the use of concrete viaducts is predominant in railway construction due to scarce land resources, low-frequency (20 200 Hz) structure-radiated noise from concrete bridges is a principal concern.
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