在研究内燃机噪声的激发、辐射和传播过程中,一定的条件下内燃机可简化为常系数线性系统。内燃机的各激振力均可视为系统输入的时序函数。系统的输出则可通过描述系统动态特性的三个主要函数(传递函数、频率响应函数和脉冲响应函数)直接求得。基于上述分析,本文写出内燃机各类噪声的数学模型,便于采用现代计算工具对内燃机噪声进行计算。 In the study of internal combustion engine noise excitation, radiation and propagation process, under certain conditions internal combustion engine can be simplified as a constant coefficient linear system. The exciting force of the internal combustion engine can be regarded as the system input timing function. The output of the system is obtained directly from the three main functions describing the system dynamics (transfer function, frequency response function and impulse response function). Based on the above analysis, this paper presents a mathematical model of various types of internal combustion engine noise, so that the use of modern computing tools to calculate the internal combustion engine noise.