【摘要】 根据RBCC动力系统工作原理,分析了RBCC运载器上升段轨迹特点和设计矛盾。针对此类飞行器工作模态多、冲压模态约束条件复杂、传统优化模型无法求解其全局最优解的问题,以Radau伪谱法为基础,建立了基于混合积分变量的全程最优轨迹求解模型,并引入连接条件模型。该模型可以有效处理RBCC运载器多段飞行轨迹约束条件,克服了传统建模方法的不足。采用50km、Ma8运载任务算例校验优化模型,优化结果显示,所研究模型符合RBCC运载器工作特点和任务需要,可快速求解此类运载器上升段最优轨迹。更多还原

【Abstract】 According to the principle of operation of RBCC,the characteristics and design problems of ascent trajectory of the RBCC-Powered RLV are analyzed. Because of multi-working-mode and the ramjet / scramjet mode limited by complicated constraints,the current optimization model can’t be used to obtain the global optimum trajectory of the sort of RLVs,a new model based on mixed integration variable for trajectory optimization is built based upon Radau pseudospectral method( RPM) and the linkage condition is imposed. All the constraints in different modes can be imposed in the new model,and the shortcoming of current models is overcome. The case with terminal conditions of 50km-Ma8 is set to verify the optimization model. The result shows that the model accords with the characteristics of RBCC-powered RLV and meets all requirements,the new model can be used in trajectory optimization of this sort of RLVs.更多还原