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Separation of Combustion and Mechanical Noise Using Wiener Filter
Technical Paper
2017-01-1870
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The objective of this paper is to develop a robust methodology to study internal combustion (IC) engine block vibrations and to quantify the contribution of combustion pressure loads and inertial loads (mechanical loads) in overall vibration levels. An established technique for noise separation that, until recently, has not been applied to engine noise is Wiener filtering. In this paper, the harmonic part of the overall vibration response of the IC engine block is removed, resulting in a residual broadband response which is uncorrelated to the source signal. This residue of the response signal and the similarly calculated residue of the combustion pressure represent the dynamic portion of their respective raw signals for that specific operating condition (engine speed and load). The dynamic portion of the combustion pressure is assumed to be correlated only to the combustion event. A relation (frequency response function) between the source signal and residual broadband response of the block is developed for each cylinder pressure source signal. This relation is defined as the Wiener filter. The Wiener filter is then multiplied by the raw cylinder pressure signals to obtain the vibration of the engine block due to the combustion contribution. Finally, the engine vibration due to the mechanical sources is obtained using the difference of the raw block vibration and the combustion contribution. It is imperative that a condition-specific filter is computed in order to analyze the response signal at a specific operating condition.
This paper successfully demonstrates the process of developing a Wiener filter for a three-cylinder IC engine and identifying the partial contribution of combustion and mechanical excitation in the overall vibration response of the IC engine block. This study is not extended to the contribution analysis for the response due to the sound pressure generated by the engine although it is conceptually possible.
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Citation
Siavoshani, S., Vesikar, P., Pentis, D., and Ippili, R., "Separation of Combustion and Mechanical Noise Using Wiener Filter," SAE Technical Paper 2017-01-1870, 2017, https://doi.org/10.4271/2017-01-1870.Also In
References
- Austen , A. and Priede , T. Origins of Diesel Engine Noise SAE Technical Paper 590127 1959 10.4271/590127
- Priede , T. In Search of Origins of Engine Noise - an Historical Review SAE Technical Paper 800534 1980 10.4271/800534
- Tung , V. and Crocker , M. Diesel Engine Noise and Relationship to Cylinder Pressure SAE Technical Paper 820237 1982 10.4271/820237
- Russell , M. and Haworth , R. Combustion Noise from High Speed Direct Injection Diesel Engines SAE Technical Paper 850973 1985 10.4271/850973
- Schaberg , P. , Priede , T. , and Dutkiewicz , R. Effects of a Rapid Pressure Rise on Engine Vibration and Noise SAE Technical Paper 900013 1990 10.4271/900013
- El Badaoui , M. , Danière , J. , Guillet , F. , and Servière , C. Separation of Combustion Noise and Piston-Slap in Diesel Engine-Part I: Separation of Combustion Noise and Piston-Slap in Diesel Engine by Cyclic Wiener Filtering Mechanical Systems and Signal Processing 19 6 1209 1217 2005 10.1016/j.ymssp.2005.08.010
- Wang , S. , Chalu , C. , and Gautier , F. Optimization of Combustion Noise of Modern Diesel Engines for Passenger Cars SAE Technical Paper 2007-01-2379 2007 10.4271/2007-01-2379
- Pruvost , L. , Leclère , Q. , and Parizet , E. Diesel Engine Combustion and Mechanical Noise Separation Using an Improved Spectrofilter Mechanical Systems and Signal Processing 23 7 2072 2087 2009 10.1016/j.ymssp.2009.04.001
- Braun , S. and Seth , B. Analysis of Repetitive Mechanism Signatures Journal of Sound and Vibration 70 4 513 522 1980 10.1016/0022-460X(80)90321-1
- Antoni , J. Cyclostationarity by Examples Mechanical Systems and Signal Processing 23 4 987 1036 2009 10.1016/j.ymssp.2008.10.010
- Leclère , Q. , Hamzaoui , N. Using the Moving Synchronous Average to Analyze Fuzzy Cyclostationary Signals Mechanical Systems and Signal Processing 44 1-2 149 159 2014 10.1016/j.ymssp.2013.01.005
- Drouet , J. , Leclère , Q. , and Parizet , E. Experimental Modeling of Wiener Filters Estimated on an Operating Diesel Engine Proceedings of Surveillance 6 2011 Compiègne, France 2011