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A Study on the Decay Process in the Time-Frequency-Dependent Combustion-Noise-Generation Model for Diesel Engines
Published January 24, 2020 by Society of Automotive Engineers of Japan in Japan
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We experimentally investigated the process of decay of engine noise from a single-cylinder diesel engine considering the time-frequency-dependent combustion-noise-generation model. In this model, the vibration energy of each frequency component is assumed to accumulate in the engine structure excited by the combustion impact during the combustion period in a cycle and decay over time, and the combustion noise is assumed to radiate from the engine surface. We used wavelet transform analysis as a time-frequency analysis of the sound pressure to obtain the decay rate, c, of the engine noise power. In order to investigate the dependence of the decay rate, c, on the sound-source location, we placed eight microphones in different positions near the engine. In order to investigate the dependence of the decay rate on the maximum in-cylinder pressure rise, we conducted experiments under three different operating conditions. The shape of the temporal variation of the engine-noise power depended on the sound-source location while the value of the engine noise power depended on the maximum in-cylinder pressure rise. Based on the time-frequency-dependent combustion-noise-generation model, we obtained the engine-noise decay rate, c, as the absolute value of the time differentials of the natural logarithm of the combustion noise power by line approximation. The results show that the decay rate, c, depends on the sound source location while it is almost independent of the maximum in-cylinder pressure rise.
CitationOguchi, H. and Mikami, M., "A Study on the Decay Process in the Time-Frequency-Dependent Combustion-Noise-Generation Model for Diesel Engines," SAE Technical Paper 2019-32-0512, 2020.
Data Sets - Support Documents
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- Inagaki, K., Mizuta, J., Fuyuto, T., Hashizume, T., and Ito, H. , “Low Emissions and High-Efficiency Diesel Combustion Using Highly Dispersed Spray with Restricted In-Cylinder Swirl and Squish Flows,” SAE International Journal of Engines, Volume 4, Issue 1, 2011, Pages 2065-2079
- Horibe, N., Takahashi, K., Harada, S., Kee, S.S. Ishiyama, T., and Shioji, M. , “Study on Selection of Combustion Chamber Geometry Suitable to PCCI Operation of a Diesel Engine,” JSME Technical paper (B) Vol. 74, No. 739, p. 223-231, 2008 (in Japanese).
- Hatano, J., Harada, T., Matsui, K., Kobayashi, H., and Matsui, R. , “Research on Expansion of Premixed Charge Compression Ignition (PCCI) Diesel Combustion Operation Range,” Honda R&D Technical Review, Vol. 22, No. 2, p. 119-125 (in Japanese).
- Nguyen, T. A., Kai, Y., and Mikami, M. , “Study on Combustion Noise from a Running Diesel Engine Based on Transient Combustion Noise Generation Model,” Int. J. Automotive Engineering, 3, pp. 131-140, 2012.
- Minato, K., Oguchi, H., Seo, T. and Mikami, M. , “A study of sound source location of radiated noise in a single-cylinder diesel engine with two-stage combustion,” JSME Annual Congress Proceedings, 2018 (in Japanese)