摘要
基于模态叠加法理论,采用l1范数稀疏解方法,实现了水下双层圆柱壳由内壳有限测点振速值重构得到内、外壳振速空间分布,进而基于边界元理论对结构水下辐射声场进行预报。通过数值计算,分析了模态数目、测点数目和模态振型误差等因素对振动声辐射预报结果的影响,为指导速度场重构时模态数目、测点数目的选取提供了一定的理论依据;结果表明基于l1范数稀疏解声学预报方法对模态振型误差有一定的鲁棒性。最后开展了水下典型双层圆柱壳结构振动声辐射预报的试验研究,可为工程领域结构的声振预报提供一定的指导思路。
Based on the theory of mode superposition,this paper proposes the l1-norm sparse solution which achieves the aim of vibration field reconstruction accurately through a few measuring points on the inner shell.Furthermore,the sound radiation field can be predicted through the analysis of relationship between vibration and sound field based on the theory of BEM.And the various influence on reconstruction results is discussed,such as the number of measurements,the number of modes,the error of modes,and so on,through numerical simulation research,which provides some theoretical guidance for reconstructing the velocity field,choosing the number of measurements and modes.The results show that the l1-norm sparse solution has the robustness to the error of structure modes.Finally,the experimental research is carried out on the reconstruction of vibration and sound field of a double cylindrical shell underwater,which can provide some guidance for prediction of structural vibration and sound in engineering field.
作者
叶海林
陈美霞
陶襄樊
YE Hai-lin;CHEN Mei-xia;TAO Xiang-fan(College of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;The Second Ship Design Research Institute of Wuhan,Wuhan 430064,China)
出处
《船舶力学》
EI
CSCD
北大核心
2019年第2期234-244,共11页
Journal of Ship Mechanics
基金
国家自然科学基金资助项目(51779098)
关键词
l1范数稀疏解
振动声辐射预报
水下圆柱壳
鲁棒性
l1-norm sparse solution
reconstruction of vibration and sound field
double cylindrical shell underwater
robustness
