摘要
以有限长加肋圆柱壳为研究对象,获取不等间距加肋圆柱壳的局域化系数,并验证局域化系数理论公式的有效性。采用通频带近似法及等效参数识别技术,利用弹簧振子链系统的局域化理论公式预报不等间距加肋圆柱壳的局域化系数。基于不规则系统的波传递矩阵具有各态历经性,通过建立多个具有相同不规则程度的非等间距有限元模型获得振动场,分析振动能量在轴向位置的平均变化曲线获取衰减系数,与预报的结果进行对比,得到不等间距加肋圆柱壳的局域化系数,验证局域化系数理论公式作为统计平均的结果,当单元数量足够多时与预报结果比较吻合。研究表明,根据数值解析得到的通频带可以给出用于振动局域化系数计算的结构参数,基于各态历经性的模型验证方法可以很好地与理论结果拟合。局域化系数公式可以作为实际结构的定量化使用。
The finite-length stiffened cylindrical shell is taken as the research object to obtain localization factor of unequal-spaced stiffened cylindrical shell and verify the validity of theoretical formula. The passband approximation method and equivalent parameter identification technology are used to predict the localization factor of unequal-spaced ribbed cylindrical shell by theoretical formula of spring-mass chain system. In view of wave transfer matrix of an irregular system has ergonomics, the vibration field is obtained by establishing multiple unequal spacing finite element models with the same degree of irregularity and the average change curve of vibration energy of axial position is analyzed to obtain attenuation coefficient so as to compare with the forecast results. The localization factor of unequally spaced ribbed cylindrical shell is obtained, and the theoretical formula of localization factor is verified as the result of statistical average. When the number of elements is large enough, it will be more consistent with the predicted result. The findings show that structural parameters for localization coefficient can be given from numerical analysis of passband. The model validation method based on the ergonomics can be well fitted to theoretical results. The theoretical formula of localization factor can be used as a quantification in actual structure.
作者
赵鹏
纪刚
李宗威
ZHAO Peng;JI Gang;LI Zongwei(College of Naval Architecture and Ocean Engineering,Naval University of Engineering,Wuhan 430033,China)
出处
《船舶工程》
CSCD
北大核心
2023年第1期71-76,共6页
Ship Engineering
基金
国防预研基金资助项目(9950204010404)。
关键词
圆柱壳
不等间距
局域化系数
预报
仿真验证
cylindrical shell
unequal spacing
localization coefficient
prediction
simulation verification
