上面级载荷与力学环境精细化设计技术

Refined Design Technology of Upper-stage Loads and Mechanical Environments

为适应不同基础级火箭飞行过程中的激励特性、不同发射任务中卫星质量和动力学特性差异、解决对空间复杂结构的精细模拟等问题,远征系列上面级开展了一系列适应性分析和精细化设计工作,并通过仿真和试验对设计正确性、合理性进行闭环验证。提出上升到单机界面的精细化力学试验条件制定、液体晃动参数仿真及计算方法修正、多分支结构的完整性设计准则、力学环境减缓等关键技术,介绍其在远征系列液体上面级中的工程应用实例,并给出后续工作展望。

Mechanical adaptability analysis and refined design are carried out in the development of Yuan Zheng upper-stage series,in order to satisfy the mechanical excitations from different launch vehicles,variant mass and dynamical characteristics of spacecrafts in multi-mission,and to obtain precise finite element(FE)modeling for the complex structures simulation.The correctness and validity of mechanical environments and loads design have been verified by combination simulations and ground tests.The engineering practices are shown,including determination of the refined test condition on unit interfaces,liquid tank sloshing parameter simulation and verification,loads design method based on strength and stiffness,vibration attenuation and so on.Finally,feasible future work has been prospected,such as flight loads telemetry and equivalent test conditions of random vibration.