Multi-Objective Emergency Landing Trajectory Design Based on Motion Primitives

Document Type : Original Article

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Abstract

This paper presents an efficient approach to determine cost criteria weights in multi-objective optimization (MOO) problem of a left wing damaged airplane trajectory generation in proximity to local terrain. Different cost criteria including terrain avoidance, Safety Value Index (SVI), and safe landing requirements such as touchdown heading and position, airspeed, and glide slope are defined.  A potential field strategy is utilized to rapidly generate emergency landing trajectories based on a library of the damaged airplane motion primitives including trim states and transition maneuvers between the trim conditions. For multiple-objective problems, the objectives are generally conflicting, preventing simultaneous optimization of each objective. Considering multiple objectives in trajectory planning in this paper, the optimum weights of each cost function is derived using Pareto analysis and pairwise comparison of normalized costs and the total cost is defined based on weighted sum method. Simulation results demonstrate the effectiveness of weight selection based on the proposed method to autonomously plan safe landing trajectories.

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