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Extraction du bruit de combustion d'un moteur Diesel. Développement et application d'un spectrofiltre.

Abstract : This PhD dissertation tackles the validation and application of a spectrofilter to separate the combustion and mechanical noises of a diesel engine. The spectrofilter is a transfer function estimate. In the present study's context, it estimates the vibroacoustic transfers of the combustion forces from the engine's cylinders to the listening spot. The spectrofilter is computed upon the in-cylinder pressure and engine noise signals. The method under study is an application of the cyclostationnarity theory. It consists in computing the spectrofilter upon the non-deterministic part of the signals. The point of this method is to reduce the error stemming from the correlation between combustion and mechanical sources. First, this method is argued on a theoretical basis and formalized so as to underline its advantages and drawbacks. Then, it is validated by various experimental results. Finally, the method is applied to estimate both the vibroacoustic transfers of combustion forces and the composition of the engine noise, as well as their variations with running condition (running speed, load and fuel's GTL content).
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Contributor : Quentin Leclere <>
Submitted on : Thursday, November 5, 2009 - 2:30:59 PM
Last modification on : Monday, January 4, 2021 - 11:12:03 AM
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  • HAL Id : tel-00429987, version 1


L. Pruvost. Extraction du bruit de combustion d'un moteur Diesel. Développement et application d'un spectrofiltre.. Sciences de l'ingénieur [physics]. INSA de Lyon, 2009. Français. ⟨tel-00429987⟩



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