Abstract:

Exhaust noise of marines diesel engines is strongly related to rotating speed. Thus, the active noise control can be realized by composing secondary sound sources with the rotating speed signals as the base frequencies. But the difficulty lies on the determination of the weights of different sound sources. An arithmetic based on calculating the best errorweights is presented to overcome the difficulty. The results indicate that the method can effectively control exhausting noise and trace the change of diesel engines rotating speed. It adapts to the working conditions of marine propelling engines, whose rotating speeds are changing frequently.

Key words: acoustics, marines diesel engine, exhausting noise, active control, selfadapting

摘要：

船艇柴油机排气噪声具有与转速强烈相关的特点，可采用以转速信号为基频合成次级声源进行噪声主动控制的方法，难点在于确定各级声源的权值。本文提出了一种计算最佳的误差权值的方法解决这一问题，并进行了实验研究。结果表明该方法可有效地控制排气噪声，并能跟踪柴油机转速变化，适合于船艇推进柴油机转速经常变化的工况。

关键词: 声学, 船艇柴油机, 排气噪声, 主动控制, 自适应