燃烧噪声一级影响模型的多元回归分析

研究了直喷式柴油机燃烧噪声与一级影响因素的关系。通过多元统计分析法，建立了动力载荷、压力高频振荡与燃烧噪声的一级影响模型，并对回归的方程进行了检验。通过求取燃烧噪声传递函数，对燃烧噪声一级影响模型进行的研究表明：该模型与燃烧压力最大值无关，与压力升高率最大值和高频压力振荡最大值及发动机结构因素有关；模型方程有一定的适用价值；压力升高率和压力高频振荡频率是影响燃烧噪声的重要因素。

Multi-Regression Analysis of the First-Level Influence Model of Combustion Noise

The effect of the first-level influence factors on combustion noise of DI diesel engines was studied.By using the method of multi-regression analysis,the first-level influence model of combustion noise sound pressure level was established.The first-level influence model was proved.By using the transfer func- tion of combustion noise,the first-level influence model of combustion noise was discussed.The results show that the first-level influence model of combustion noise doesn't relate to the maximum cylinder pressure,but relates to the maximum rate of pressure rise,maximum amplitude of high-frequency oscillation of combustion pressure and structure factors of an engine;the equation of the first-level influence model of combustion noise has some practical value;the rate of pressure rise and the frequency of high-frequency oscillation of combus- tion pressure are important factors of to influence the combustion noise.