Abstract
Multi-objective optimization simulation to improve combustion noise, fuel consumption and exhaust emission was proposed. The simulation verified sound level improvement, however improvement of the combustion sound quality remained an issue. To improve diesel engine sound quality induced by combustion, investigations for a combustion chamber resonance was carried out. As a result, an acoustic characteristic of actual combustion chamber was acknowledged with an acoustic excitation test for in-cylinder and a pressure distribution measurement under operating condition. This report shows the results following the investigation focusing on the relationship between the combustion process and the resonance phenomenon.
