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首页> 外文期刊>The Journal of the Acoustical Society of America >Modeling sound propagation in acoustic waveguides using a hybrid numerical method
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Modeling sound propagation in acoustic waveguides using a hybrid numerical method

机译：使用混合数值方法模拟声波导中的声音传播

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摘要

Sound propagation in an acoustic waveguide is examined using a hybrid numerical technique. Here, the waveguide is assumed to be infinite in length with an arbitrary but uniform cross section. Placed centrally within the guide is a short component section with an irregular nonuniform shape. The hybrid method utilizes a wave based modal solution for a uniform section of the guide and, using either a mode matching or point collocation approach, matches this to a standard finite element based solution for the component section. Thus, one needs only to generate a transverse finite element mesh in uniform sections of the waveguide and this significantly reduces the number of degrees of freedom required. Moreover, utilizing a wave based solution removes the need to numerically enforce a nonreflecting boundary condition at infinity using a necessarily finite mesh, which is often encountered in studies that use only the standard finite element method. Accordingly, the component transmission loss may readily be computed and predictions are, presented here for three examples: an expansion chamber, a con verging-diverging duct, and a circular cylinder. Good agreement with analytic models is observed, and transmission loss predictions are also presented for multimode incident and transmitted sound fields. (C) 2008 Acoustical Society of America. [DOI: 10.1121/1.2967837]
机译：使用混合数值技术检查声波导中的声音传播。在此，假定波导的长度是无限的，具有任意但均匀的横截面。放置在导向器中央的是一个短的部件部分，具有不规则的不均匀形状。混合方法对导向的均匀截面使用基于波的模态解决方案，并使用模式匹配或点配置方法，将其与组件截面的基于标准有限元的解决方案相匹配。因此，仅需在波导的均匀部分中产生横向有限元网格，并且这大大减少了所需的自由度的数量。而且，利用基于波的解决方案消除了使用必要的有限网格在无穷大处强制实施无反射边界条件的需求，这在仅使用标准有限元方法的研究中经常遇到。因此，可以容易地计算出部件的传输损耗，并在此处给出了三个示例的预测：膨胀室，会聚歧管和圆柱体。观察到与分析模型的良好一致性，并且还给出了多模入射和透射声场的传输损耗预测。 （C）2008年美国声学学会。 [DOI：10.1121 / 1.2967837]

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