【摘要】 首先概述了闭式柴油发电机组的结构形式,然后针对某380kW闭式柴油发电机组噪声过大的问题,按国际标准对机组噪声进行了测试,结合柴油发电机组的声源特性和传播特点,通过频谱分析和声源分离方法,确定了发电机组的主要噪声源和声源贡献量。从噪声源本身和噪声传递路径两方面对噪声进行控制,采取降低风扇转速、更换减振垫、增加吸音棉厚度和改善消声器性能等降噪措施,使机组噪声下降显著,声功率级降低至98分贝,最终满足欧盟法规要求。更多还原

【Abstract】 It described the structure of enclosed diesel generator set firstly,and then focused on the problem that the noise level of 380 kW enclosed diesel generator was too high.According to the national standard,we tested the noise level of genset.Combining with sound source characteristics and tansmission characteristics of diesel genset and using the spectrum analysis and source separation method,we determined the main noise sources of genset and each source’s contribution.We used the methods of focusing on noise source and noise tansfer path to control the noise,such as reducing the cooling fan speed,changing the damping pad,increasing the thickness of sound-aborbing cotton and improving muffler performance etc.Finally,the noise level of generator sets reduced significantly and the sound power level decreased to 98 dB,which meets the requirements of EU regulations.更多还原