Abstract
In the automotive sector, diesel engine becomes common engine as much as gasoline engine due to diesel's enourmous torque outcome with more efficient way of fuel consumption. In contrast to excessive torque and fuel efficiency advantages, diesel engine produces cylinder pressure in order to satisfy higher compression ratio results in noise and vibration problem. Extreme cylinder pressure and generated dynamic forces cause excessive vibration and noise problem specifically as known as combustion noise. Researchers study on combustion noise to understand effective parameters and combustion noise have been associated with two essential parameters which are structural transfer function of the combustion noise and cylinder pressure. This study is performed to obtain structural transfer function of the combustion noise from combustion chamber to microphones. Structural FE model is built for a heavy duty diesel engine and surface velocity of the engine is obtained from nodes of the each element on the outer surface. These results are imported into acoustic analysis in order to collect microphone data as SPL in dB format. Structural attenuation of the diesel engine has been extracted from each microphone results and combustion noise transfer function is plotted in 3rd octave frequency bands from 500 Hz up to 3150 Hz. Parametric study has been performed in order to satisfy correlation between test and CAE results. Study expresses the opportunity of numerical study on the transfer function of combustion noise for a heavy duty diesel engine can be extracted and transfer function plays a fundamental role to improve weak frequency contents of the structure in aspect of NVH.
Original language | English |
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Publication status | Published - 2017 |
Event | 24th International Congress on Sound and Vibration, ICSV 2017 - London, United Kingdom Duration: 23 Jul 2017 → 27 Jul 2017 |
Conference
Conference | 24th International Congress on Sound and Vibration, ICSV 2017 |
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Country/Territory | United Kingdom |
City | London |
Period | 23/07/17 → 27/07/17 |
Keywords
- Acoustic analysis
- Combustion noise
- Diesel engine
- Finite element methods