086 - Frequency sinks on transient periodic signals
Alvarenga E.
Abstract
Several industrial equipments radiate noise due to fast periodic transient vibration or gas pulsation, such as hammers, compressors and others. As transient phenomena, the noise spectrum trends to be flat over frequency, but with lobs and sinks. When this transient pulse is also periodic, a spectrum containing harmonics will overlap the transient spectrum. By analyzing these kind of transient signals on time, it is possible generate 'sinks' on specific frequencies. Using a parametric study of a suction pulsation signal, it is possible to point out what variables should be changed to achieve higher attenuation on specific frequencies. An example will be shown on a real transient signal.
Citation
Alvarenga E.: Frequency sinks on transient periodic signals, CD-ROM Proceedings of the Thirtheenth International Congress on Sound and Vibration (ICSV13), July 2-6, 2006, Vienna, Austria, Eds.: Eberhardsteiner, J.; Mang, H.A.; Waubke, H., Publisher: Vienna University of Technology, Austria, ISBN: 3-9501554-5-7
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