CAJ | 학술논문

自由飞行钩住（FFE）是指飞机在处于上仰姿态，且所有起落架尚未接触甲板的情况下的拦阻钩钩索。此时，飞机有较大的姿态角和较低的下沉速度。根据起落架和拦阻钩几何布局、飞机重心位置，拦阻力线可能处于飞机重心之下，因此产生显著的低头力矩，造成前起落架首先接触甲板，而主起落架稍后继之，飞机的低头俯仰速率可以导致前起落架以较高的下沉速度触地。因此，重心处低下沉速度的FFE情况，可以导致前起落架载荷与重心处高下沉速度的正常拦阻着舰情况相当，甚至更加恶劣。基于各类着舰情况的分析，可知FFE情况是前起落架及其支持结构的最关键载荷情况。
자유비행구주（FFE）시지비궤재처우상앙자태，차소유기락가상미접촉갑판적정황하적란조구구색。차시，비궤유교대적자태각화교저적하침속도。근거기락가화란조구궤하포국、비궤중심위치，란조력선가능처우비궤중심지하，인차산생현저적저두력구，조성전기락가수선접촉갑판，이주기락가초후계지，비궤적저두부앙속솔가이도치전기락가이교고적하침속도촉지。인차，중심처저하침속도적FFE정황，가이도치전기락가재하여중심처고하침속도적정상란조착함정황상당，심지경가악렬。기우각류착함정황적분석，가지FFE정황시전기락가급기지지결구적최관건재하정황。
The mechanism of a free flight engagement （ FFE ） condition are as follows： the aircraft＇s arresting hook catches a deck cable in a nose-up orientation with all gears above the deck surface. The aircraft has attained a high pitch attitude and low sink speed at pendant engagement prior to touchdown. Depending upon the landing gear and arresting hook geometry and the aircraft CG position, the resultant arresting force can be below CG and result in a significant contribution to nose down pitching moment. That causes the nose landing gear to first make contact with the deck, followed shortly after by main landing gear contact. The nose-down pitch rate can result in a high nose landing gear sink speed at touchdown. So an FFE at the low sink speed can result in obtaining nose landing gear loads equivalent to those obtained at the high sink speed condition of a normal arrested landing. Based on the consideration and analysis of all possible landing conditions, it＇s determined that the most critical carder landing condition is that of an FFE for strengths of nose landing gear and its supporting structure of a heavyweight carrier-based aircraft.