【摘要】 应用有限元法分析进出口管同轴扩张室式消声器的声学性能,计算其传递损失并与一维平面波理论计算对比,分析一维平面波理论的适用范围。通过分析出口管偏置消声器,双出口管消声器和两腔消声器的声学性能表明:出口管位置和数量影响消声器中高频消声性能,而两腔消声器则能明显改善消声器中低频的消声效果。更多还原

【Abstract】 The finite element method is used to analyze the acoustic characteristics of an expansion-chamber muffler with its inlet and outlet pipes being co-axial.Its transmission loss(TL) is calculated.The result is compared with that of the one-dimensional solutions based on planar wave theory.The limitation of one-dimensional planar wave theory is discussed.The acoustic characteristics of eccentric outlet muffler,double-outlet muffler and double-cavity muffler are analyzed.The result indicates that the position and the number of outlet can affect the acoustic characteristic of a muffler for higher and medium frequencies;while the double-cavity muffler has high noise-elimination efficiency for lower and medium frequencies.更多还原