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首页> 外文会议>International Congress on Sound and Vibration >EFFICIENT APPROACHES FOR THE ACOUSTIC MODELLING OF AUTOMOTIVE EXHAUST DEVICES. APPLICATION TO CONFIGURATIONS INCORPORATING GRANULAR MATERIALS AND MONOLITHS
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EFFICIENT APPROACHES FOR THE ACOUSTIC MODELLING OF AUTOMOTIVE EXHAUST DEVICES. APPLICATION TO CONFIGURATIONS INCORPORATING GRANULAR MATERIALS AND MONOLITHS

机译：汽车排气装置声学建模的有效方法。应用于包含粒状材料和整料的配置

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The acoustic modelling of automotive exhaust devices, such as silencers and catalytic converters, usually requires the use of multidimensional numerical techniques. The presence of three-dimensional waves can be considered through the finite element method (FEM). With a view to reduce the computational effort of the FEM, efficient modelling techniques based on the numerical version of the mode matching method are presented in the current work to speed up transmission loss calculations in exhaust devices incorporating features such as granular materials and monoliths. Absorbent granular materials are studied here as a potential alternative to the traditional fibrous materials used in dissipative silencers, while monolith capillary ducts are commonly used in catalytic converters. First, the transversal pressure modes are computed for devices with arbitrary but axially uniform cross sections. For silencers with granular material, a number of geometries with different filling configurations are considered taking into account the abrupt transition air/material. Then, the mode matching method is applied to the compatibility conditions of the acoustic fields at all the device interfaces to couple the modal expansions and to obtain the complete solution of the wave equation. As shown in earlier studies, granular materials can be modelled through equivalent complex and frequency dependent density and speed of sound, the porosity playing an important role; regarding the acoustic modelling of monoliths, these can be replaced by a four pole transfer matrix relating the acoustic fields at both sides of the monolithic region. The computational efficiency and accuracy of the results associated with the numerical modelling techniques presented here are assessed for silencers with granular material and catalytic converters with monolith. The numerical mode matching approach provides accurate predictions of the device attenuation performance and outperforms the computational expenditure of FE computations.
机译：汽车排气装置的声学建模，例如消音器和催化转换器，通常需要使用多维数值技术。可以通过有限元方法（FEM）考虑三维波的存在。为了降低FEM的计算工作，在当前工作中提出了基于模式匹配方法的数值匹配方法的高效建模技术，以加速结合粒状材料和甘料的排气装置中的传输损耗计算。这里研究了吸收性粒状材料作为耗散消解器中使用的传统纤维材料的潜在替代品，而整体毛细管管道通常用于催化转化器。首先，为具有任意但轴向均匀的横截面的装置计算横向压力模式。对于具有粒状材料的消声器，考虑到突然的过渡空气/材料，考虑了许多具有不同填充配置的几何形状。然后，将模式匹配方法应用于所有设备接口的声场的兼容条件，以将模态扩展耦合并获得波动方程的完整解决方案。如早期研究所示，颗粒材料可以通过等同的复杂和频率依赖性密度和声音速度建模，孔隙率发挥着重要作用;关于单氧化钛的声学建模，这些可以由四极转移矩阵替换，其在整体区域两侧相关的声场。与此处呈现的数值建模技术相关的结果的计算效率和准确性被评估为具有颗粒材料和催化转化器的沉默物和具有整料的催化转化器。数值模式匹配方法提供了设备衰减性能的准确预测，并且优于FE计算的计算支出。

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