Moohyung Lee, J. Stuart Bolton and Sanghoon Suh, “A procedure for estimating the combustion noise transfer matrix of a diesel engine,” Proceedings of the 15th International Congress on Sound and Vibration, Daejeon, Korea, July 6-10, 2008.


In the present work, a procedure for estimating an engine-platform-dependent transfer matrix that relates cylinder pressures to radiated sound pressures resulting from the combustion process is developed based on multi-input/multi-output (MIMO) system analysis in conjunction with cross-spectral measurements. The measurement scheme comprises a set of pressure transducers flush mounted to the engine cylinders and field microphones at locations of interest. To-date, the empirical prediction of diesel engine combustion noise has usually been achieved by combining a cylinder pressure with a single, smoothed structural attenuation function. In comparison, the proposed procedure provides the structural attenuation characteristics in the form of a transfer matrix specific to a particular engine, thus allowing more accurate prediction by accounting fully for inter-cylinder correlation and cylinder-to-cylinder variation. The procedure is demonstrated by the application to a six-cylinder diesel engine


Diesel engine, Combustion noise, Transfer matrix, Coherence methods


Acoustics and Noise Control

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