After carrying out a theoretical analysis of vibration and sound radiation of mill cylinder, simulation for acoustic field has been preceded by boundary element method.

本文对球磨机筒体的振动和声辐射进行了理论分析，然后结合边界元方法对筒体辐射声场进行了仿真分析。

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Gm also says the mill will be "one of the quietest and most refined engines in the segment" because of an acoustic intake manifold cover and inverted-tooth camshaft chains.

另外，GM表示新引擎将是“同级之中其中一款最宁静及最精细引擎”，因为新引擎采用一个静音进气歧管盖及倒齿式凸轮轴链条。

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