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基于弹簧—质量简化模型进行液体运载火箭充液贮箱纵向结构动力学建模分析时,需要考虑贮箱箱底的刚度影响,Larry D.Pinson基于线性薄膜理论推导了充液贮箱椭球箱底的纵向刚度模型,本文基于有限元方法进行了贮箱箱底刚度的数值求解,计算结果与文献方法进行了比较,计算结果一致,同时数值求解方法可以较好地解决厚度不均匀以及异型的贮箱箱底的刚度求解。
Based on the spring-mass simplified model, the dynamics of the longitudinal structure of the liquid-filled rocket liquid-filled tank needs to be considered when considering the stiffness of the tank bottom. Based on the linear thin-film theory, Larry D. Pinson deduces the bottom of the ellipsoidal tank Longitudinal stiffness model, this paper based on the finite element method for tank bottom rigidity numerical solution, the calculation results and the literature methods are compared, the calculated results are consistent, and numerical solution method can better solve the uneven thickness and shaped tank bottom The stiffness of solution.