外挂物对大展弦比直机翼颤振特性的影响  

Effects of external stores on flutter characteristics of a straight wing with high aspect ratio

作　　者：祁武超[1] 张贺铭 田素梅[1] 许卫锴[1] QI Wu-chao;ZHANG He-ming;TIAN Su-mei;XU Wei-kai(Key Laboratory of Liaoning Province for Aircraft Composite Structural Analysis and Simulation,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学辽宁省飞行器复合材料结构分析与仿真重点实验室,沈阳110136

出　　处：《计算力学学报》2022年第5期598-607,共10页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(11502149);辽宁省自然科学基金(2019-ZD-0228);辽宁省教育厅系列项目(JYT2020029,JYT2020034)资助项目。

摘　　要：为提高带外挂物大展弦比直机翼的颤振速度,基于假设模态法提出一种带集中质量弯扭组合梁模态分析手段,结合片条理论考察外挂物不同质量及布置形式对机翼颤振特性的影响。首先,基于弯扭组合梁建立带外挂物大展弦比直机翼的结构动力学模型,并利用假设模态法得到其弯曲和扭转模态。其次,引入片条理论近似计算有限翼展升力面的气动力,调整外挂物的质量、数目及其在机翼展向和弦向的相对位置,得到外挂物对机翼颤振特性的影响规律。最后,利用在机翼前缘附近悬吊小质量外挂物可提高机翼颤振速度的优势,探究颤振速度恢复方法并提出颤振速度恢复的优化问题,使得携带外挂物的机翼与不携带外挂物的机翼颤振速度基本相同。研究结果表明,外挂物的不同悬挂方式可引起机翼颤振模态的跳转,在以俯仰为颤振主模态的机翼上可调整外挂物位置以恢复原机翼的颤振速度。A modal analysis strategy of bending and torsion of a composite beam with concentrated masses based on the assumed mode method is proposed to improve the flutter speed of a straight and high aspect ratio wing with external stores.Combined with the strip theory,the effects of external stores’different mass and layout on the flutter characteristics of the wing are investigated.Firstly,the structural dynamic model of a high aspect ratio wing with external stores is constructed based on the bending and torsion theroy of composite beams.Its bending and torsion modes are obtained by using the assumed mode method.Secondly,the finite strip theory are introduced to approximately calculate the aerodynamic force of the wing with finite span.Then the influence laws of external stores on flutter characteristics of the wing are obtained by adjusting the mass,the numbers and the relative positions of these external stores.Finally,a flutter speed recovery method is explored and an optimization problem is proposed.This method takes advantage of a way to increase flutter speed by suspending a small-mass external store near the leading edge of the wing so that the flutter speed of the wing with external stores is basically the same as that of the wing without the stores.The results show that the flutter mode can jump from one mode to others owing to different ways of external store suspension.When the main flutter mode is about pitch the original flutter speed can be recovered by adjusting the position of the external stores.

关 键 词：颤振 外挂物 大展弦比 直机翼 

分 类 号：V214.1[航空宇航科学与技术—航空宇航推进理论与工程] O327[理学—一般力学与力学基础]