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工程力学  2015 

基于特征正交分解的三维壁板非线性颤振分析

DOI: 10.6052/j.issn.1000-4750.2013.07.0667, PP. 1-9

Keywords: 壁板,非线性颤振,特征正交分解,降阶模型,von,Karman板,Galerkin法

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Abstract:

基于vonKarman大变形理论及活塞理论建立超音速流中壁板的气动弹性方程。采用特征正交分解法(POD)结合向伽辽金法(Galerkin)的映射这样一种半解析法建立降阶模型(ROM)求解三维壁板的非线性气动弹性问题,并与传统的Galerkin法对比。发现并证明了POD数值模态与伽辽金法简谐基函数之间转换矩阵的正交性,从而简化了POD降阶模型的建立过程。通过数值算例考察了POD法的准确性、收敛性及高效性。结果表明POD降阶模型能够以更少的模态,更高的计算效率达到与Galerkin法同样的精度。以长宽比4为例,POD法以2个模态,3s的时间计算了壁板的振动响应;而Galerkin法需要16个模态,900s的时间。

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