弹性飞机空投载荷设计技术
收稿日期: 2013-12-02
修回日期: 2014-04-21
网络出版日期: 2014-05-09
基金资助
国家"863"计划 (2012AA7022020)
Flight Loads Design Technique for Flexible Aircraft Airdrop
Received date: 2013-12-02
Revised date: 2014-04-21
Online published: 2014-05-09
Supported by
National High-tech Research and Development Program of China (2012AA7022020)
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.
荆志伟 , 侯宗团 , 郭兆电 . 弹性飞机空投载荷设计技术[J]. 航空学报, 2014 , 35(11) : 3037 -3045 . DOI: 10.7527/S1000-6893.2014.0068
Airdrop analysis is one of the maneuvers concerned by flight loads design. The state of the art in the airdrop load design mainly applies to the rigid aircraft, and it cannot solve the airdrop load design for the flexible aircraft encountering gust. In order to improve the precision of airdrop load design, dynamic response and structural load analysis approach considering the elastic vibration modes of the flexible aircraft encountering gust is presented. The key challenge of dynamic response analysis for flexible aircraft airdrop is the modeling method for linear time-variant system. Employing the stationary-basis method, dynamic response equations for flexible aircraft airdrop are established. The minimum-state (MS) method is employed to carry out rational aerodynamic approximation. A hybrid approach is employed to obtain the discrete gust load in time domain. The single heavy cargo airdrop is simulated numerically, focusing on the force from cargo to aircraft and the wing's load. Simulation results demonstrate that the dynamic response analysis method for flexible aircraft proposed in this paper can represent the airdrop load of aircraft and supply a technique to airdrop load for flexible aircraft.
Key words： flexible aircraft; airdrop; cargo moving; gust; flight loads
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