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On the effect of the dispersion error when updating acoustic models

机译:关于更新声学模型时色散误差的影响

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摘要

In the frame of predicting acoustic pressure fields by means of numerical simulations, many tools are already available, making mostly use of the finite or boundary element techniques. In order to get simulated acoustic pressure fields closer to the reality, updating techniques can be used. Particularly, one focuses on a validation method based on the constitutive law error (CLE), which was initially proposed by P. Ladeveze [New Advances in Adaptative Computational Methods in Mechanics, Elsevier, 1998, pp. 135-151] in structural dynamics, and was recently applied to acoustics [V. Decouvreur et al., in: H. Mang, F. Rammerstorfer, J. Eberhardsteiner (Eds.), WCCM V Fifth World Congress on Computational Mechanics, Vienna, Austria, Vienna University of Technology, 2002, ISBN 3-9501554-0-6]. These works use the FEM as numerical approximation method. When increasing the frequency, the validation quality decreases, due to the growing discretization error of the linear FEM. Therefore, to diminish the discretization error, another approximation method is used, namely the element-free Galerkin method. A case study is presented where the discretization error is controlled and the effects on the updating parameters (the admittance coefficients) is evaluated. Comparing the results coming from the validation when using both FEM and EFGM shows that a numerical method with robust frequency behaviour is more suited for updating setups with highly frequency dependent parameters.
机译:在通过数值模拟预测声压场的框架中,已经有许多工具可用,主要使用有限或边界元技术。为了使模拟声压场更接近实际,可以使用更新技术。特别是,人们专注于一种基于本构律误差(CLE)的验证方法,该方法最初是由P. Ladeveze提出的[力学适应性计算方法的新进展,Elsevier,1998年,第135-151页],并且最近应用于声学[V. Decouvreur等人:H。Mang,F。Rammerstorfer,J。Eberhardsteiner(编),WCCM V第五届世界计算力学大会,奥地利维也纳,维也纳工业大学,2002年,ISBN 3-9501554-0- 6]。这些工作使用有限元法作为数值逼近方法。当增加频率时,由于线性有限元法离散误差的增加,验证质量下降。因此,为减小离散误差,使用了另一种近似方法,即无元素Galerkin方法。提出了一个案例研究,其中控制离散误差并评估对更新参数(导纳系数)的影响。比较同时使用FEM和EFGM时来自验证的结果,结果表明,具有稳健的频率行为的数值方法更适合于更新具有高度频率相关性参数的设置。

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