【摘要】 针对柴油机 (4 85 )低频排气噪声 ,对其产生机理、规律及其影响因素等作了理论计算、分析及实验。对低频排气噪声信号进行频域分析后可知 ,其主要由一系列离散的谐波组成 ,是以柴油机点火频率为基频的一种类周期性噪声 ,有可能应用有源噪声控制技术。更多还原

【Abstract】 The low frequency exhaust noise of a diesel(4 85),its generation,frequency characteristics and influencing factors have been studied through theoretic calculation,analysis and experiment.After the analysis of the low frequency exhaust noise,we can conclude that it is mainly composed of a series of discrete humorous waves,and it is a quasi periodic noise that its fundamental frequency is the fire frequency of a diesel,hence it can be attenuated by use of active noise control technique.更多还原