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将贮箱箱底建模为环段,采用递推公式将推进剂纵向质量分散到环段,代替目前广泛应用的柱段底点纵向耦合质量单元方法,建立了运载火箭动特性模型。分析表明各环段分散量均匀并呈单调递减趋势。计算结果和试验对比表明该建模方法能获取更为精确的模态计算结果。
The tank bottom is modeled as a ring segment, and the longitudinal mass of the propellant is dispersed to the ring segment by using the recursion formula. Instead of the longitudinally coupled mass element method of the bottom point of the column, a dynamic model of the launch vehicle is established. Analysis shows that the ring segments dispersed evenly and monotonically decreasing trend. Comparing the calculated results with the experimental results shows that the modeling method can obtain more accurate modal calculation results.