At low flow attenuation performance of semi-active muffler was computed respectively by using theoretical formula and three-dimension finite element method.
低速气流时，分别进行了半主动消声器的消声性能理论计算和三维有限元法数值计算。
At low flow attenuation performance of semi-active muffler was computed respectively by using theoretical formula and three-dimension finite element method.
低速气流时，分别进行了半主动消声器的消声性能理论计算和三维有限元法数值计算。
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