Effects of Aircraft Aeroelastic Deformations on External Store Separation Dynamics
Effects of Aircraft Aeroelastic Deformations on External Store Separation Dynamics
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DOI：
10.1115/imece2013-63772
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
M. Kozak;E. N. Yildiz;Y. Yazıcıoğlu;E. Cigeroglu
中科院分区：
文献类型：
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作者：
M. Kozak;E. N. Yildiz;Y. Yazıcıoğlu;E. Cigeroglu
进行外挂物分离分析是为了通过改变飞行/弹射条件来估算军用飞机上外挂物的安全分离包线。典型的分离分析要么只考虑悬挂物在行程末端（EoS）以外的运动，要么用预定义的弹射力求解EoS条件，假定弹射力相对于飞行/弹射条件是不变的。在模拟EoS条件和精确的弹射载荷方面，文献中存在着差距。地面和飞行试验数据表明，悬挂物的动态响应差异超过可接受的极限，其中空气动力学和飞机弹性是这种不相关的两个主要来源。为了建立可靠的数学模型，使地面试验数据与真实的弹射情况有合理的相关性，不仅要考虑弹射器和外挂物动力学，而且要考虑外挂物空气动力学、飞机空气动力学、飞机刚体动力学、飞机弹性。为了说明飞机变形对外挂物EoS条件的影响，首先提出了一种能更精确地估算外挂物弹射载荷和EoS条件的方法。为了使气动弹性对外挂物弹射动力学的影响可视化，通过改变机翼扭转刚度值和外挂物安装位置沿沿着飞机纵轴的位置来处理各种虚拟试验情况。外挂物的加速度响应（包括和不包括气动弹性效应）用于强调气动弹性对弹射的影响。版权所有© 2013，ASME
Store separation analyses are carried out in order to estimate the safe separation envelope for external stores carried on military aircrafts by varying the flight/ejection conditions. Typical separation analysis considers either only the store motion beyond the end-of-stroke (EoS), or solves the EoS conditions with predefined ejection forcing that are assumed to be unaltered with respect to flight/ejection conditions. There exists a gap in the literature in modeling the EoS conditions and precise ejection loads. Data from ground and flight tests show that, dynamic responses of a store differ beyond acceptable limits where aerodynamics and aircraft elasticity are the two main sources of this miscorrelation. In order to have a reliable mathematical model that modifies the ground test data to have a reasonable correlation with the real ejection case, not only ejector and store dynamics but also store aerodynamics, aircraft aerodynamics, aircraft rigid body dynamics, aircraft elasticity should be considered. To show the effects of aircraft deformation on the EoS store conditions, first of all, a methodology that can be used to estimate the ejection loads and EoS conditions of the store more precisely is presented. For the purpose of visualizing the aeroelastic effects on store ejection dynamics, various virtual test cases are handled by changing wing torsional stiffness values and store mounting station positions along aircraft longitudinal axis. The acceleration responses of the store, obtained with and without the inclusion of aeroelastic effects, are used to emphasize the effects of aeroelasticity on ejection.Copyright © 2013 by ASME