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Mechanism and optimization of fuel injection parameters on combustion noise of DI diesel engine 被引量:7
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作者 张庆辉 郝志勇 +2 位作者 郑旭 杨文英 毛杰 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第2期379-393,共15页
Combustion noise takes large proportion in diesel engine noise and the studies of its influence factors play an important role in noise reduction. Engine noise and cylinder pressure measurement experiments were carrie... Combustion noise takes large proportion in diesel engine noise and the studies of its influence factors play an important role in noise reduction. Engine noise and cylinder pressure measurement experiments were carried out. And the improved attenuation curves were obtained, by which the engine noise was predicted. The effect of fuel injection parameters in combustion noise was investigated during the combustion process. At last, the method combining single variable optimization and multivariate combination was introduced to online optimize the combustion noise. The results show that injection parameters can affect the cylinder pressure rise rate and heat release rate, and consequently affect the cylinder pressure load and pressure oscillation to influence the combustion noise. Among these parameters, main injection advance angle has the greatest influence on the combustion noise, while the pilot injection interval time takes the second place, and the pilot injection quantity is of minimal impact. After the optimal design of the combustion noise, the average sound pressure level of the engine is distinctly reduced by 1.0 d B(A) generally. Meanwhile, the power, emission and economy performances are ensured. 展开更多
关键词 diesel engine injection parameters pilot injection combustion noise online optimization
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Engine Noise Prediction by Using Multi-body Simulation
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作者 Siano Daniela 《Journal of Environmental Science and Engineering(B)》 2012年第10期1146-1161,共16页
Abstract: This paper presents a coupled multi-body and FEM (finite element method)-BEM (boundary element method) methodology used to carry out a comprehensive NVH (noise, vibration and harshness) investigation ... Abstract: This paper presents a coupled multi-body and FEM (finite element method)-BEM (boundary element method) methodology used to carry out a comprehensive NVH (noise, vibration and harshness) investigation of a four-cylinder internal combustion engine prototype. Firstly, a MBDS (multi-body dynamic simulation) of the internal combustion engine has been carried out, at a defined operating condition, in order to determine the excitation force of the powertrain exciting the cylinder block. In this way, the dynamics of the engine powertrain have been described taking into account both the effects of the gas forces of the combustion process and the inertia forces of the moving parts. Afterwards, the cylinder block excitation forces have been used to evaluate the engine block vibrations and to predict the external noise radiated with both the well-known ATV (acoustic transfer vectors) and MATV (modal acoustic transfer vectors) methodologies at a distance of 1 m from the engine, according to the standard ISO 3744. The dynamics of the engine powertrain and its vibro-acoustic behaviour have been described using LMS (learning management system) Engineering Innovation Virtual.Lab tools. 展开更多
关键词 FEM BEM multi-body dynamic ENGINE combustion noise.
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