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圆柱壳体作为航空航天工程中的主要结构构形,对其在空气中运动的阻尼特性进行研究具有重要意义。首先运用有限元软件LS-DYNA的任意拉格朗日欧拉算法(Arbitrary Lagrangian-Eulerian,简称ALE)模块对不同几何尺寸的圆柱壳体在空气中的运动历程进行动响应计算分析,并通过不同尺度大小空气域对数值计算的准确性进行验证;然后采用粘性阻尼模型模拟空气作用,用Isight优化软件进行最佳逼近,反演出与空气对圆柱壳体作用等效的质量阻尼系数和刚度阻尼系数,并应用于加筋模型和缩小尺寸模型进行验算。结果表明:用反演系数计算的结果和ALE结果吻合良好,质量和刚度的改变对阻尼系数没有明显影响。
Cylindrical shell, as the main structure in aerospace engineering, is of great significance to study its damping characteristics in air movement. First, the dynamic response of cylindrical shells with different geometries in air is calculated and analyzed by using the arbitrary Arbitrary Lagrangian-Eulerian (LS-DYNA) finite element software LS-DYNA. Then the viscous damping model was used to simulate the air effect and the best approximation was performed with Isight optimization software. The equivalent mass damping coefficient and stiffness damping coefficient of the air acting on the cylindrical shell were obtained. , And applied to reinforced models and reduced size models for checking. The results show that the results calculated by inversion coefficients are in good agreement with the ALE results. The change of mass and stiffness has no significant effect on the damping coefficient.