摘要
采用薄壁梁理论将非对称变截面船体梁离散为n段均质有限梁,针对其自由振动为垂向弯曲、水平弯曲及扭转耦合振动的特点,应用迁移矩阵法推导出船体结构的固有频率和固有振型求解公式.把公式系统编制成计算机程序,并通过实船算例及开口薄壁直梁模型计算了其固有频率及固有振型,分析了翘曲变形对其固有特性的影响.计算结果表明:考虑翘曲刚度后,结构的固有频率比同尺寸不计翘曲时有所升高,尤其在扭转振型为主要振型时,频率升高得更多.
The unsymmetrical hull is dispersed into some uniform units applying the thin-walled beam theory. Based on the analysis of flexural-torsion coupling vibration, the natural frequencies and principal modes are calculated by the transfer matrix method, then the influence of warping on dynamic characteristics of ship structures is analysed by computation examples. The results show that warping would have a significant effect on the torsion-dominated modes by raising the resonant frequency.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2003年第8期992-995,共4页
Journal of Harbin Institute of Technology
