吊挂飞行对重型直升机空中共振稳定性的影响机理分析  

Effects of slung load on heavy lift helicopter air resonance stability

作　　者：王洛烽 陈仁良[1] WANG Luofeng;CHEN Renliang(National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics,College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学航空学院直升机旋翼动力学国家级重点实验室,南京210016

出　　处：《航空学报》2023年第16期147-157,共11页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(11672128);江苏高校优势学科建设工程资助项目。

摘　　要：飞行员驾驶重型直升机完成飞行任务时,可能出现与机体弹性变形有关的空中共振问题,且在吊挂飞行时会加剧,因此通过刚弹耦合建模与分析指出了重型直升机吊挂飞行时可能导致空中共振的3个耦合模态:旋翼摆振前进型-机体垂向弯曲耦合模态;旋翼-机体-吊索耦合模态;摆振后退型-机体滚转耦合模态。研究了这3个耦合模态对重型直升机空中共振稳定性的影响机理。分析结果表明:第1个耦合模态在重载吊挂悬停时最容易导致空中共振,而第2个耦合模态在轻载吊挂飞行时对空中共振稳定性影响最大,它们都会涉及旋翼摆振运动与机体垂向弯曲变形的耦合,但第2种会出现明显的吊索伸缩运动;第3个耦合模态会导致空中共振稳定裕度在重载吊挂时降低18%。Piloted heavy lift helicopters are faced with air resonance problems related to fuselage elasticity,which de⁃teriorate when carrying a slung load.This paper points out three coupled modes that may lead to air resonance through heavy lift helicopters with slung load through rigid-elastic coupled modeling and analysis.The first is rotor pro⁃gressive lag and fuselage vertical bending coupled mode,the second rotor-body-sling coupled mode,and the third re⁃gressive lag and fuselage rolling coupled air resonance.Their mechanisms and effects of slung load on air resonance stability were investigated.The results show that the first coupled mode is most likely to cause air resonance while hovering with heavy slung load,and that the second coupled mode has the largest impact on the air resonance stabil⁃ity when flying with light slung load.They are both related to rotor lagging motion and fuselage vertical bending,but the second involves significant sling extending-retracting.The third coupled mode causes an 18%reduction in air reso⁃nance stability margin when carrying a heavy slung load.

关 键 词：重型直升机 直升机吊挂系统 直升机飞行动力学 空中共振 刚弹耦合 稳定性 

分 类 号：V212.6[航空宇航科学与技术—航空宇航推进理论与工程]