发动机排气电控消声实验系统的研究

Research on Electronic Noise Cancellation System of Engine Exhaust

为了提高发动机的动力性、经济性指标，同时改善其排放性能，根据发动机排气噪声的频谱特征，结合有源消声技术的特点，提出并设计了一种可消除低频噪声的发动机排气电控消声实验系统，并对该系统的消声机理进行了理论研究．电控消声实验系统的实验结果表明，在低频段取得了平均降噪３０ ｄＢ以上的效果．

To increase engine' s dynamic performance, economic index and improve its exhaust, an experimental system used to cancel low-frequency noise of engine exhaust was put forward, and the noise cancellation mechanism of the system was also studied. The exprimential results demonstrated that the average noise level was decreased by more than 30 dB in low-frequency band.