提出了有限元-模态匹配混合方法用于计算消声器中高频传递损失，将消声器进出口面上的节点声学量展开为模态叠加的形式并代入有限元方程，以本征函数为权系数对进出口面上的声压进行积分，从而建立起以内部节点声学量和进出口模态幅值系数为未知量的线性方程组。结合边界条件计算得到消声器进出口面上的各阶模态幅值系数，进而得到进出口声功率用于传递损失的计算。分别对抗性和阻性消声器的传递损失进行了计算，验证了有限元-模态匹配混合方法在全频段范围的有效性。
Abstract
A FE-mode matching hybrid method was proposed to evaluate the transmission loss of silencers in mid-high frequency range. The acoustic variables at the inlet and outlet were expressed in terms of modal superposition form and then substituted into the FE equation of a silencer. The intrinsic functions of the system were adopted as weight functions, the sound pressures at the inlet and outlet area were integrated. Therefore, the linear equations with internal nodal acoustic variables and modal amplitude coefficients at the inlet and outlet as the unknown variables were established. The modal amplitude coefficients at the inlet and outlet were then obtained by solving the linear equations combining the corresponding boundary conditions. Furthermore, the sound powers at the inlet and outlet were gained to calculate the transmission loss of a silencer. The transmission losses of reactive and dissipative silencers were calculated, respectively to verify the effectiveness of the proposed approach in the whole frequency domain.
关键词
消声器 /
传递损失 /
中高频 /
有限元 /
模态匹配
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Key words
silencer /
transmission loss /
mid-high frequency /
finite element (FE) /
mode matching
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参考文献
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