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• W2013621791 abstract "The knowledge of the particle velocity fluctuations associated with acoustic pressure oscillation in the exhaust system of internal combustion engines may represent a powerful aid in the design of such systems, from the point of view of both engine performance improvement and exhaust noise abatement. However, usual velocity measurement techniques, even if applicable, are not well suited to the aggressive environment existing in exhaust systems. In this paper, a method to obtain a suitable estimate of velocity fluctuations is proposed, which is based on the application of spatial filtering (beamforming) techniques to instantaneous pressure measurements. Making use of simulated pressure-time histories, several algorithms have been checked by comparison between the simulated and the estimated velocity fluctuations. Then, problems related to the experimental procedure and associated with the proposed methodology are addressed, making application to measurements made in a real exhaust system. The results indicate that, if proper care is taken when performing the measurements, the application of beamforming techniques gives a reasonable estimate of the velocity fluctuations." @default.
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• W2013621791 date "2000-10-26" @default.
• W2013621791 modified "2023-10-14" @default.
• W2013621791 title "Estimation of velocity fluctuation in internal combustion engine exhaust systems through beamforming techniques" @default.
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• W2013621791 doi "https://doi.org/10.1088/0957-0233/11/11/307" @default.
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