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首页> 外文期刊>SAE International Journal of Passenger Cars - Mechanical Systems >Discrete Flow Mapping - A Mesh Based Simulation Tool for Mid-to-High Frequency Vibro-Acoustic Excitation of Complex Automotive Structures
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Discrete Flow Mapping - A Mesh Based Simulation Tool for Mid-to-High Frequency Vibro-Acoustic Excitation of Complex Automotive Structures

机译：离散流映射-基于网格的复杂汽车结构中高频振动声激励仿真工具

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摘要

Modelling the vibro-acoustic properties of mechanical built-up structures is a challenging task, especially in the mid to high frequency regime, even with the computational resources available today. Standard modelling tools for complex vehicle parts include finite and boundary element methods (FEM and BEM), as well as Multi-Body Simulations (MBS). These methods are, however, robust only in the low frequency regime. In particular, FEM is not scalable to higher frequencies due to the prohibitive increase in model size. We have recently developed a new method called Discrete Flow Mapping (DFM), which extends existing high frequency methods, such as Statistical Energy Analysis or the so-called Dynamical Energy Analysis (DEA), to work on meshed structures. It provides for the first time detailed spatial information about the vibrational energy of a whole built-up structure of arbitrary complexity in this frequency range. The response of small-scale features and coupling coefficients between sub-components are obtained through local FEM models integrated in the global DFM treatment. The computational cost of DFM is largely frequency independent making it possible to get results from the mid-to-high frequency regime. This tool will be important when considering the vibrational response of a structure as a whole moving away from modelling vibrations only in sub-parts of the mechanical body.
机译：对机械组合结构的振动声特性进行建模是一项艰巨的任务，特别是在中高频范围内，即使有当今可用的计算资源也是如此。用于复杂车辆部件的标准建模工具包括有限元和边界元方法（FEM和BEM）以及多体仿真（MBS）。然而，这些方法仅在低频范围内才是鲁棒的。特别是，由于模型尺寸的过大增加，FEM无法扩展到更高的频率。最近，我们开发了一种称为离散流映射（DFM）的新方法，该方法将现有的高频方法（例如统计能量分析或所谓的动态能量分析（DEA））扩展到了网格结构上。它首次提供了有关此频率范围内任意复杂性的整个建筑物结构振动能量的详细空间信息。通过集成在全局DFM处理中的局部FEM模型可以获得小尺度特征的响应以及子组件之间的耦合系数。 DFM的计算成本在很大程度上与频率无关，从而可以从中高频方式获得结果。当考虑整个结构的振动响应而不是仅对机械主体的子部分建模振动时，此工具将非常重要。

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