某集装箱船的振动特性分析

Analysis on Dynamic Characteristics for Container Ship

用有限元法对一艘集装箱船的振动固有特性进行预报,即对船体和上层建筑的固有频率与振型进行数值计算,又用经验公式对局部结构的低阶固有频率进行计算。所有预报的固有频率都与主机和螺旋桨的激振频率进行对比分析,以判断是否满足规范要求的频率余度,避免船体、上层建筑和局部结构发生共振。

The dynamic characteristics of a container ship are calculated by using finite element method, including the prediction of natural frequencies and mode shapes of the hull structure and superstructures. The low-order natural frequencies of some local structures are computed by empirical formulae. All predicted natural frequencies are compared with the excitation frequencies of the main engine and propeller in order to avoid resonances.