边界约束对直升机尾操纵拉杆安装频率影响分析  

Analysis of Boundary Constraints Influence on Mounting Frequency of Helicopter Tail Control Stick

作　　者：沈安澜[1] 侯宝红 陈静[1] 曾曼成[1] 江安[1] SHEN Anlan;HOU Baohong;CHEN Jing;ZENG Mancheng;JIANG An(China Helicopter Research and Development Institute,Jingdezhen 333001,China;Unit No.66350 of PLA,Baoding 071000,China)

机构地区：[1]中国直升机设计研究所,景德镇333001 [2]解放军66350部队,保定071000

出　　处：《南京航空航天大学学报》2021年第2期291-298,共8页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：针对某型直升机在飞行过程中出现脚蹬高频振动问题,通过飞行振动数据分析,确定了故障原因为尾操纵拉杆动特性不佳导致尾操纵拉杆局部共振,从而引起脚蹬高频振动。为了满足装配要求,尾操纵拉杆与安装支座之间为间隙配合,导致尾操纵拉杆边界约束存在不确定性,因此有必要进行边界约束敏感性分析。本文采用弹簧刚度表征尾操纵拉杆边界约束,并基于Ritz法建立尾操纵拉杆理论模型,分析讨论了边界约束对尾斜拉杆安装频率的影响,同时根据计算分析结果提出了相应的解决方案。经地面动特性试验和飞行试验验证,该解决方案可以有效改善该型机脚蹬高频振动问题,同时对后续操纵拉杆设计和分析具有一定的参考意义。Aiming at the high frequency vibration problem of the helicopter pedal,it is determined that the case of the vibration problem is the tail control stick local resonance caused by poor dynamic characteristics of the tail control stick through the flight vibration data analysis.In order to meet the requirements of installation,there is a small gap between the tail control stick and stick support,and this gap leads to the uncertainty of the retraining strength of the tail control stick,so it is necessary to carry out the sensitivity analysis of boundary constraints of the tail control stick.In this paper,the spring stiffness is used to characterize the effect of the small gap between tail control stick and stick support.The influence of boundary constraints on mounting frequency of the tail control stick is analyzed by tail control stick dynamic theoretical model based on Ritz method.Furthermore,the solution method is putted forward.Ground test and flight test show that the solution method can effectively improve the tail control stick high frequency vibration problem,and has a certain reference significance for the subsequent design and analysis of the control stick.

关 键 词：直升机 尾操纵拉杆 高频振动 安装频率 敏感性分析 

分 类 号：V227[航空宇航科学与技术—飞行器设计] TB123[理学—工程力学]