摘要
针对海上浮式装置力学分析中选用不同截止频率阈值得到重构的冲击载荷对结构响应结果有较大影响的问题,采用变分模态分解(Variable Mode Decomposition,VMD)方法得到冲击载荷各本征模态函数、对应频谱的特征频率和最大加速度幅值。选取不同的截止因数,重构得到不同的冲击载荷。数值仿真结果表明:当截止因数为0.01时,重构的冲击载荷动力学响应与原始冲击载荷动力学响应基本保持一致;在保证足够的安全裕度的前提下,当截止因数选0.20时,可获得更低的截止频率。
In view of the problem that there is significant impact on the structural response results using different cut-off frequency thresholds to obtain reconstructed impact loads in the mechanical analysis of offshore floating devices,the Variational Mode Decomposition(VMD)method is used to obtain the eigenmode functions of the shock load,the primary peak frequency of the corresponding frequency spectrum and the maximum acceleration amplitude.By selecting different cut-off factors,different impact loads are be obtained by reconstruction.The numerical simulation results show that:when the cut-off factor is 0.01,the dynamic response of the reconstructed shock load is basically consistent with that of the original shock load;on the premise of ensuring sufficient safety margin,the lower cut-off frequency can be obtained when the cut-off factor is selected as 0.20.
作者
帅剑云
刘松
王伟
肖梦凡
张守杰
SHUAI Jianyun;LIU Song;WANG Wei;XIAO Mengfan;ZHANG Shoujie(System Engineering and Transformation Center,China Nuclear Power Technology Research Institute,Shenzhen 518000,Guangdong,China;School of Naval Architecture and Ocean Engineering,Faculty of Vehicle Engineering and Mechanics,Dalian University of Technology,Dalian 116024,Liaoning,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《中国海洋平台》
2023年第3期49-54,共6页
China offshore Platform
基金
国家自然科学基金“基于相位共轭方法的多目标噪声源在复杂声场中分离和识别研究”(编号:51609037)。
关键词
海上浮式装置
变分模态分解
截止频率
冲击载荷
动力响应
offshore floating device
variational mode decomposition
cut-off frequency
impact load
dynamic response