两种舰船—飞机耦合系统的降阶建模方法

TWO REDUCED MODELING METHODS FOR COUPLED SYSTEM OF AIRCRAFT AND FLIGHT DECK OF SHIPS

舰船的运动和甲板的变形，对着舰飞机的冲击载荷会产生影响，而该冲击载荷又会直接影响飞行甲板的变形，因此两者的运动是耦合的，需要把它们作为一耦合系统进行分析。本文对该耦合系统提出了两种降阶建模方法。该方法首先对飞行甲板进行动力缩聚，使其只包含在整个降落过程中会与飞机起落架的运动发生耦合的所有自由度，然后把降阶了的模型与飞机一起建工耦合动力学方程。运用该方法建立起来的动力学方程规模将大大减小。通过对某型号飞机及舰船计算表明，本文提出的方法是可行的。

The shock loads of a landing aircraft will be affected by the movements and deformations of a ship and deck. On the other hand, the deformation of the deck will also be affectby the shock loads directly. The aircraft and the deck should be treated as a coupled system since the two movements affect each other. Two reduced modeling rnethods are presented. In these approaches, the finite elernent model of flight deck is condensed at firstand the condensed model only consists all the degrees of freedom which will couple withthe deformation of landing gears of aircraft during the landing. Then the coupled dynamicequation is formulated using the condensed model and the aircraft. The order of tht coupled dynamic equation will reduce much by using the proposed methods. Practical numerical example for a certain type of aircraft and ship demostrates that the proposed approaches are efficient.