An integrated trajectory optimization method for strong coupling and multi-constraints vehicle is presented. Based on the characteristics of strong coupling and multi-constraints, considering the change rate of angle of attack and safety margin of scramjet as additional constraint conditions and taking the minimum coupling degree as optimization index, the reference trajectory is adopted, which uses a smoothing method for solving multi-constraint s optimal problems. The reference trajectory can avoid the scramjet being in unsafe working condition to a certain extent, and also can greatly improve the accuracy of reference trajectory tracking. Based on the precise simulation model, the simulation analysis is carried out. The simulation results show that the method is effective and reliable.
There are strong coupling interactions between aerodynamics and scramjet, this kind of aircraft also has multiple restrictions, such as the range and difference of dynamic pressure, airflow, and fuel. On the one hand, we need balance the requirement between maneuverability of vehicle and stabilization of scramjet. On the other hand, we need harmonize the change of altitude and the velocity. By describing aircraft’s index system of climbing capability, acceleration capability, the coupling degree in aerospace, this paper further propose a rapid design method which based on target practice. This method aimed for reducing the coupling degree, it depresses the coupling between aircraft and engine in navigation phase, satisfy multiple restriction conditions to leave some control buffer and create good condition for control implementation. According to the simulation, this method could be used for multiple typical fly commissions such as climbing, acceleration or both.
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