【摘要】 为研究导弹潜航时的自振特性,采用通用有限元软件ANSYS建立了适合浸没圆柱壳的有限元模型,用ANSYS结构模态分析的非对称法分析了导弹结构的静水模态。结果显示静水模态的固有频率比干模态有较大下降,振型类似;尾舵和水深对模态的影响不大。更多还原

【Abstract】 To study submerging missile’s free-vibration characteristic,an FEM model adapting to submeerged cylindrical shell was built with general FEM software-ANSYS, and the missile’s calm-water modes were analyzed using the unsymmetrical method in ANSYS structural modal analysis. Results demonstrate that the natural frequency of calm-water modes is much lower than dry modes’, but the mode shape is similar. And the influence of controlpiston and depth on modes is very little. In contrast to wet-mode method based on finite-element added-mass of liquid, this skill is more competent for complicated submerged structure’s modal analysis.更多还原