FEA-based methods for optimising structure-borne sound radiation
FEA-based methods for optimising structure-borne sound radiation
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DOI：
10.1016/j.ymssp.2016.07.019
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发表时间：
2017-05
影响因子：
8.4
通讯作者：
M. Klaerner;M. Wuehrl;Lothar Kroll;S. Marburg
中科院分区：
文献类型：
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作者：
M. Klaerner;M. Wuehrl;Lothar Kroll;S. Marburg
轻质部件通常坚硬且壁薄，因此往往具有显着的声辐射。此外，使用纤维增强塑料可以通过操纵铺层、纤维和基体材料或纤维体积含量来广泛调整材料特性，例如刚度甚至阻尼。由于复合材料中存在大量自由参数，因此在设计和优化中需要有效的模拟方法。相比之下，声学测量需要具有流固耦合的复杂多物理模型，并且通常无法在标准 FEA 软件中实现。基于组件表面速度的不同方法填补了这一空白。即，假定整个表面具有单位辐射效率并忽略局部效应作为结构噪声的上限，则存在等效辐射功率。此外，体积速度为较低频率范围提供了良好的结果，频率相关的辐射效率以及偶极子模式的集总参数模型预测也是准确的。最后，动能在稳态 FEA 解决方案中隐式给出，因此无需任何额外的努力即可提供有关动态行为的信息。通过这些方法估计辐射声功率的可能性和局限性将通过对复合部件的数值研究来证明。此外，总功率作为频率积分用于证明此类优化目标的可行性和准确性。
Lightweight components are typically stiff and thin-walled and thus tend to have significant sound radiation. Moreover using fibre reinforced plastics offers a wide range of adjusting the material properties such as stiffness and even damping by manipulating layup, fibre and matrix material or fibre volume content. With numerous free parameters within the composites, there is a need of efficient simulation methods in design and optimisation. In contrast, acoustic measures require complex multi-physical models with fluid–structure interaction and are commonly not implemented in standard FEA software.Different approaches based on the surface velocity of the component fill the gap. Namely, there is the equivalent radiated power, assuming a unit radiation efficiency all over the surface and neglecting local effects as an upper bound of structure-borne noise. In addition, the volume velocity provides good results for the lower frequency range with the frequency-dependent radiation efficiency as well as the lumped parameter model predictions being exact for dipole modes, too. Last, the kinetic energy is implicitly given in steady state FEA solutions and thus provides information about the dynamic behaviour without any additional efforts. Possibilities and limits of estimating the radiated sound power by these methods will be shown by numerical studies on a composite component. Moreover, the total power as an integral over frequency is used to demonstrate the feasibility and accuracy of such optimisation objectives.