声诊断内燃机燃烧过程的研究(一)——燃烧噪声识别的数学模型

Engine Combustion Process Study Using Sound Diagnosis——The Mathematical Model for Discerning Combustion Noise(Part 1)

燃烧噪声识别是声诊断燃烧过程的关键.本文在分析现有燃烧噪声分离技术的基础上,提出用"相干输出功率谱函数法"识别燃烧噪声.本法是从总噪声中直接识别燃烧噪声,无须求取机械噪声,从而消除了由于燃烧压力引起附加机械噪声增量的影响.

The discernment of combustion noise is the key to diagnosing combustion process. This paper presents coherence Spectral function as a method to discern combustion noise on the basis of analyzing the existing technique for separating combustion noise. With this method the combustion noise can be directly discerned from engine noise without discerning the mechanical noise. This method can eliminate the effect of additional mechanical noise due to combustion pressure.