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Dispersion-Relation-Preserving (DRP) numerical schemes have been used to simulate the acoustic field in long enclosures by modifying the source conditions. The high spectral resolution of the used numerical schemes helps to investigate and assess the variations in the acoustic field created due to different sources. The investigated source characteristics include static point source, moving point source with constant and varying velocity and a moving line source with a Gaussian distribution. The presence of multiple frequencies has also been addressed, considering both monotone and poly-tonal sources. This investigation paves way for the frequency manipulation of unwanted signals in enclosures. The noise levels are mapped at various receiver locations to demonstrate the dependence of the formed acoustic field nature on the dimensional parameters of long enclosures, and the possibility of orchestrating the dimensional attributes of the enclosure for optimum noise performance in presence of varying source characteristics has been addressed.
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