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飞机进行货物空投是进行飞行载荷设计时所需考虑的机动之一,现有的空投载荷设计方法主要是基于刚体飞机运动方程建立的,尚不能解决弹性飞机遭遇阵风时的货物空投载荷设计问题。为了提高空投载荷设计精度,考虑了飞机的弹性振动自由度,提出了弹性飞机遭遇阵风时的货物空投动响应和结构载荷分析方法。对弹性飞机空投动响应分析的主要难点为线性时变系统的动力学建模:基于稳定基底法,推导了弹性飞机货物空投动响应一般运动方程;采用最小状态(MS)法对频域气动力进行有理函数拟合;利用混合建模方法对时域离散阵风激励进行计算。对弹性飞机单件重装货物空投进行了仿真,重点分析了货物对载机地板的作用力和机翼的受载。仿真结果表明,本文提出的弹性飞机货物空投动响应分析方法可以很好地反映飞机的空投受载情况,能够作为弹性飞机空投载荷设计的手段。
It is one of the maneuvers to be considered in the design of flight loads. The existing design method of airdrop loads is mainly based on the equations of motion of rigid-body aircraft. It still can not solve the problem of the design of the air-drop loads of the flexible aircraft in the event of gusts. In order to improve the accuracy of the design of the airdrop payload, the degree of freedom of the elastic vibration of the aircraft is taken into account. The airborne response of the flexible aircraft to the gust and the structural load analysis method are proposed. The main difficulty in the analysis of response to the empty aircraft launch is the dynamic modeling of the linear time-varying system. Based on the stable basement method, the general equation of motion for the response of the empty aircraft to the aircraft is deduced. The minimum state (MS) The rational function fitting is carried out; and the hybrid modeling method is used to calculate the discrete-time gust excitation in the time domain. The simulation of single-unit reloading of flexible aircraft was carried out. Emphasis was placed on the force acting on the floor of the aircraft and the load on the wing. The simulation results show that the method proposed in this paper can effectively reflect the loading and unloading conditions of the aircraft and can be used as a means of designing the payload of the flexible aircraft.