曲轴是大型船用发动机的重要部件，大型船用组合式曲轴的曲柄是组成大型曲轴的关键零件。
Crankshaft is a very important component of large Marine engine and its key component is crank.
根据特种发动机排气噪声的特性和消声器的安装要求，设计了一个组合式排气消声器。
According to the exhaust noise characteristics of special engine and the installation request of exhaust muffler, the exhaust muffler for special engine was designed.
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