火箭结构估重与总体优化设计的数字化实现及应用

Digital Implementation and Application for Structural WeightEstimation and General Optimization of Launch Vehicles

火箭新型号总体方案论证时,一般借鉴国内外相近规模和相同推进剂火箭的结构系数进行类比确定子级结构系数,按照比例系数分配贮箱和壳段等部段的质量,但该质量分配不能反映载荷对结构设计的影响,在细化迭代设计中易造成方案无法闭环,导致设计工作反复。为了加快总体方案论证,提出一种基于载荷的箭体结构快速估重方法,开发形成结构估重数字化模块并嵌入总体设计平台。应用案例表明,提出的数字化估重平台能够有效提高估重精度,同时显著缩短论证周期,兼具总体方案比较和优化、全箭质量管理等功能,能有效降低方案推翻重新设计的风险,在新型号总体方案论证中发挥了重要作用。

During the overall scheme argumentation of new launch vehicles,structural coefficients of those with similar scale or same propellants are used for reference and then structural weight of launch vehicle segments are calculated.As the weight of tanks,shells and other segments is given according to proportionality coefficients,it is irrelevant with the loads on the structure,which can cause large differences in detailed iterative design,so that the scheme cannot be self-consistent and has to be done repeatedly.In order to expedite the overall design process,method of fast structural weight estimation is studied.A structural weight estimation digital module is build and embedded into the overall design platform,which estimate structural weight based on the loads and in the loop,so that the precision is much better and the required time is much fewer.By this method,the risk of redesign is smaller and the efficiency of overall argumentation is greatly improved.The structural weight estimation digital module also provides the function of overall scheme comparison and optimization and weight management of launch vehicles.It played a great role in scheme argumentation of new launch vehicles,and extended its application to other type of launch vehicles and other research phases.