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首页> 外文期刊>Advances in Acoustics and Vibration >A Nonlinear Quasi-3D Approach for the Modeling of Mufflers with Perforated Elements and Sound-Absorbing Material
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A Nonlinear Quasi-3D Approach for the Modeling of Mufflers with Perforated Elements and Sound-Absorbing Material

机译：带有穿孔元件和吸声材料的消声器的非线性拟3D建模方法

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Increasing demands on the capabilities of engine thermo-fluid dynamic simulation and the ability to accurately predict both performance and acoustics have led to the development of several approaches, ranging from fully 3D to simplified 1D models. The quasi-3D approach is proposed as a compromise between the time-demanding 3D CFD analysis and the fast 1D approach; it allows to model the acoustics of intake and exhaust system components, used in internal combustion engines, resorting to a 3D network of OD cells. Due to its 3D nature, the model predicts high-order modes, improving the accuracy at high frequencies with respect to conventional plane-wave approaches. The conservation equations of mass and energy are solved at cell centers, whereas the momentum equation is applied to cell connections including specific source term to account for the of sound-absorbing materials and perforated elements. The quasi-3D approach has been validated by comparing the predicted transmission loss to measured data for a number of standard configurations typical of internal combustion engine exhaust systems: a reverse-flow chamber and series chambers with perforates and resistive material.
机译：对发动机热流体动态仿真功能以及准确预测性能和声学性能的需求日益增长，导致了从完全3D到简化1D模型的几种方法的发展。拟准3D方法是要求时间的3D CFD分析和快速1D方法之间的折衷方案。借助OD单元的3D网络，它可以对用于内燃机的进气和排气系统组件的声学建模。由于其3D性质，该模型可以预测高阶模，相对于传统的平面波方法，可以提高高频下的精度。质量和能量守恒方程在单元中心求解，而动量方程则应用于包括特定源项在内的单元连接，以考虑吸声材料和穿孔元件的影响。准3D方法已通过将预测的传输损耗与测量数据进行了比较，这些测量结果是针对多种典型的内燃机排气系统标准配置进行测量的：逆流室和带有穿孔和电阻材料的串联室。

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