Browse Publications Technical Papers 2018-01-1505
2018-06-13

Reducing of airborne noise by using friction induced damping 2018-01-1505

The acoustical optimization of airborne noise inherently involves the reduction of radiating surfaces and an increase of damping. Concerning noise radiation a fixed disk was investigated by means of calculations. From a theoretical point of view these effects are uncoupled. Hence the influence on sound radiation caused by geometrical properties (e.g. size/position of holes) and the link to the effects damping and radiation surface as well as their mutual influence were investigated. At a first step, an optimization was performed. This optimization was followed by the consideration of airborne noise. Damping as a dissipative process may be caused by friction. To take account of this fact the contact was modeled by a Kelvin-Voigt-model. Modeling was followed by complex modal analysis to obtain representative dynamic behavior (e.g. modal damping). Optimization were processed by direct/surface processes in order to evaluate the influence of geometrical alterations on the radiated noise. The size of the holes were used as optimization parameter, while the surface and damping are selected as response. As experimental result variations of the geometry lead to different damping parameters although the contact was defined as constant. This effect can be attributed to differences of the wave propagation. Computational optimizations show a significant reduction. By computational examinations potential of optimization could be identified for a disk-shaped component. To enhance the meaning of these proceeding further tasks may be the adjustment of the objective function as well as the optimization bandwidth.

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