在对船舶进行有限元分析时重心的调整费时费力，因此基于有限元法研究整船重心对固有频率结果的影响程度，对比不同重心高度下固有频率的变化趋势，通过有限元法和经验公式法对比验证结果的正确性。通过圆柱算例的对比，得出基本规律，然后对全船固有频率进行计算，得出如下结论：一定范围内固有频率会随着重心高度的增加而减小，并在急剧变化之后趋于平缓。因此可根据有限元计算全船重心对固有频率的关系，指导全船重心的调整幅度。
The adjustment of the center of gravity in the finite element analysis of the ship is time-consuming and laboring, so this paper studies the influence degree of the whole ship's center of gravity on the natural frequency results based on the finite element method, by comparing the variation trend of natural frequency at different height of center of gravity, the correctness of the results was verified by finite element method and empirical formula method. Through the comparison of the cylindrical example, the basic law is obtained, and then the natural frequency of the whole ship is calculated, and the following conclusions are drawn: In a certain range, the natural frequency will decrease with the increase of the height of the center of gravity, and tends to be flat after a sharp change. Therefore, the relation between the result of the center of gravity of the whole ship and the natural frequency can be used to guide the adjustment range of the center of gravity of the whole ship in the calculation according to the finite element.
2023,45(1): 14-17 收稿日期：2021-08-09
DOI：10.3404/j.issn.1672-7649.2023.01.003
分类号：U661
基金项目：国家自然科学基金资助项目(52001145)
作者简介：张志浩(1996-),男,硕士研究生,研究方向为结构振动与冲击
