带粘弹减摆器旋翼系统气弹稳定性试验与阻尼识别  

Model experiment and damping identification for aeroelastic stability of helicopter rotor with elastomeric lag damper

作　　者：杨卫东[1] 马杰[1] 张呈林[1] 

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

出　　处：《振动工程学报》2007年第1期101-106,共6页Journal of Vibration Engineering

摘　　要：针对带粘弹减摆器旋翼系统气弹稳定性试验中测量所得信号可能出现的大阻尼、频率成分密集及信噪比差等情况,采用数值仿真,比较基于傅立叶级数移动矩形窗法(FSMB)、Hilbert法(HT)和传统的基于FFT移动矩形窗法(FFT-MB),从这类信号中识别阻尼的优缺点。在两米量级旋翼台上进行了带粘弹减摆器铰接式动力学相似模型旋翼气弹稳定性试验,采用角位移传感器测量摆振信号,用上述三种方法对试验结果进行稳定性分析。数值仿真和试验结果表明,角位移传感器测量信号有较高的信噪比;在大阻尼、频率成分密集及信噪比差的情况下,FSMB法与HT法较传统的移动矩形窗法有较高的识别精度。Accurate damping identification from the transient time domain test data of an advanced helicopter rotor system with elastomeric dampers is usually difficult, for the problems such as high noise, high damping levels and the close space of modal frequency. The performance of three different methods of damping identification, the method of Fourier Series Base Moving Block （FSMB）, the method of Hilbert Transform（HT） and the FFT Base Moving Block （FFT-MB）, are compared through numerical simulations. An aeroelastic stability experiment is carried out in a 2. 4-diameter articulated rotor with elastomeric dampers. The lag signals of blades measured by sensors of angular displacement are analyzed through FSMB, HT and FFT-MB separately. Numerical and experimental results indicate that the sensor of angular displacement is an effective method to measure the lag of articulated rotor and the FSMB and HT are more effective than the FFT-MB to analyze the damping of rotor with elastomeric damper.

关 键 词：旋翼 粘弹减摆器 气弹稳定性 阻尼识别 

分 类 号：V216.12[航空宇航科学与技术—航空宇航推进理论与工程]