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Acoustic modelling and analyses of geometrically complex systems with Micro-perforated panels
Journal of Sound and Vibration ( IF 4.7 ) Pub Date : 2021-02-02 , DOI: 10.1016/j.jsv.2021.115995
Xiaoqi Zhang , Li Cheng , Yang Liu , Jingtao Du

Modeling of vibro/acoustic systems with embedded acoustic components of complex geometries is a challenging task. In particular, the presence of irregular-shaped acoustic modules, which are usually treated by finite element (FE) method, increases system complexities and makes the use of existing sub-structuring modeling techniques cumbersome. To tackle the problem, an efficient three-dimensional sub-structuring modeling method is proposed in this paper. As an important sub-structural module, a dedicated coordinate transformation technique is established to cope with polygon acoustic components. The embodiment of the technique into the existing sub-structuring framework avoids the use of conventional FE modules, thus increasing the flexibility and the efficiency of the simulation, conducive to system optimization. As an example, noise reduction in a duct, comprising a Micro-Perforated Panel (MPP) liner and a trapezoidal expansion chamber, is examined. The accuracy of the proposed model is firstly validated against both FE simulations and experiments. Numerical results uncover a dual hybrid sound reduction process, namely sound absorption of the MPP and wave reflection due to the geometry changes of the duct. Optimizations based on the proposed sub-structuring technique allow one to balance the hybrid reflective-absorptive effects through proper parameter tuning to maximize the sound attenuation within a prescribed frequency range.



中文翻译:

带有微孔板的几何复杂系统的声学建模和分析

具有复杂几何形状的嵌入式声学组件的振动/声学系统的建模是一项艰巨的任务。尤其是,通常通过有限元(FE)方法处理的不规则形状的声学模块的存在会增加系统的复杂性,并使现有子结构建模技术的使用变得麻烦。针对这一问题,本文提出了一种有效的三维子结构建模方法。作为重要的子结构模块,建立了专用的坐标转换技术来处理多边形声学分量。该技术在现有子结构框架中的实施方式避免了使用传统的有限元模块,从而增加了仿真的灵活性和效率,有利于系统优化。举个例子,检查了包括微孔板(MPP)衬里和梯形膨胀室的管道中的噪音降低情况。首先通过有限元仿真和实验验证了所提模型的准确性。数值结果揭示了双重混合降声过程,即MPP的吸声和导管几何形状变化引起的波反射。基于所提出的子构造技术的优化使人们可以通过适当的参数调整来平衡混合反射吸收效果,以在规定的频率范围内使声音衰减最大化。数值结果揭示了双重混合降声过程,即MPP的吸声和导管几何形状变化引起的波反射。基于所提出的子构造技术的优化使人们可以通过适当的参数调整来平衡混合反射吸收效果,以在规定的频率范围内使声音衰减最大化。数值结果揭示了双重混合降声过程,即MPP的吸声和导管几何形状变化引起的波反射。基于所提出的子构造技术的优化使人们可以通过适当的参数调整来平衡混合反射吸收效果,以在规定的频率范围内使声音衰减最大化。

更新日期:2021-02-10
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