Damping identification technique for helicopter bearingless rotor blades&rsquo; lead-lag mode#br#

PDF(1160 KB)

Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (19) : 225-230.

Damping identification technique for helicopter bearingless rotor blades’ lead-lag mode#br#

ZHANG Shiming,ZHOU Yun, HU Heping

Author information +

History +

Abstract

Helicopter rotor blades’ first order lead-lag backward type mode is the main mode to affect its ground resonance stability.To identify the damping of this first order lead-lag mode, four different methods including FFT-based moving block (FFT-MB), Fourier series-based moving block (FSMB), Hilbert transform (HT) and Wavelet transform (WT) were proposed.Aiming at measured signals appearing dense frequency components and had signal-noise-ratio (SNR), a digital filter was added.Numerical simulation and recognition results based on test data indicated that both FSMB and WT methods can be used to effectively separate the first order lead-lag mode of helicopter bearingless rotor blades and the digital filter can be used to effectively improve the damping identification accuracy of this lead-lag mode.

Key words

Rotor / Bearingless / Damping Identification / Lead-lag Motion / Filter

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

ZHANG Shiming,ZHOU Yun, HU Heping. Damping identification technique for helicopter bearingless rotor blades’ lead-lag mode#br#[J]. Journal of Vibration and Shock, 2018, 37(19): 225-230

References

[1] Johnston J F, Conner F. The reactionless inplane mode of stiff inplane hingeless rotors [C]. Lockheed-Corporation, December, 1973.
[2] Smith C B. Damping Identification in Helicopter Rotor System [D]. Dissertation submitted to the Graduate School of the University of Maryland, College Park in partial fulfillment of the requirements for the degree of Doctor of Philosophy, 1999:10-12.
[3] Smith C B, Wereley N M. Damping identification in helicopter rotor systems [A]. Proceedings of the American Helicopter Society 54th Annual Forum [C]. 1998.
[4] Ruzzene M, Fasana A, Garibaldi L, er al. Natural frequencies and damping identification using wavelet transform. Application to real data [J]. Experimental Mechanics, 1997, 11(2):207-218.
[5] Heping Hu, Yun Zhou, Wei Meng. Design and Aeroelastic Stability Test of_Five-Blades Froude Scaled Model Rotor. Basic Research More Advance in Rotorcraft Technology, The 2nd Asia/Austrialian Rotorcraft Forum and The 4th Internation Basic Research Conference on Rotorceaft Technology, Tianjin in PRC September, 2013:324-328.
[6] 代煜，孙和义，李慧鹏，等. 基于小波变换的弱非线性阻尼和刚度辨识方法[J]. 振动与冲击，2009, 28(2): 51-55.
DAI Yu, SUN He-yi, LI Hui-Peng,et al. Identification of weak nonlinearities in damping and stiffness based on wavelet transform [J]. Journal of vibration and shock, 2009, 28(2): 51-55.
[7] 杜永峰，赵丽洁，党星海，等.基于最优复Morlet小波的结构密集模态参数识别[J]. 振动与冲击，2015, 34(1): 135-139.
DU Yong-feng, ZHAO Li-jie, DANG Xing-hai,et al. Idetification of structural closely modes parameters based on optimized complex Morlet wavelet [J]. Journal of vibration and shock, 2015, 34(1): 135-139.
[8] 杨卫东，马杰，张呈林.带粘弹减摆器旋翼系统气弹稳定性试验与阻尼识别[J].振动工程学报,2007,120(1):101-106.
YANG Wei-dong, MA Jie, ZHANG Cheng-lin. Model experiment and damping identification for aeroelastic stability of helicopter rotor with elastometric lag damper [J]. Journal of Vibration engineering, 2007, 120(1):101-106.
[9] 胡国才,向锦武，张晓谷.直升机桨叶液压减摆器等效阻尼计算研究.计算力学学报，2003, 20(1):71-75.
HU Guo-cai, XIANG Jin-wu, ZHANG Xiao-gu. Study on equivalent damping calcution for hydraulic damper of helicopter rotor. Chinese Journal of Computational Mechanics, 2003, 20(1):71-75
[10] 李燕秀，胡和平.阻尼识别方法在旋翼系统中的应用[J].直升机技术，2010(3):11-15.
LI Yan-xiu, HU He-ping. The study of damping identification in helicopter rotor system[J], Helicopter Technique, 2010(3):11-15.
[11] 胡广书.数字信号处理理论、算法与实现.清华大学出版社，2003.
HU Guang-shu. Digital signal processing theory, algorism and application. Tsinghua University Press, 2003.
[12] Zhao Y S，Wereley N M．Time domain damping identification in helicopter rotor systems [A]．42nd AIAA/ASME/ASEE/AHS/ASC Structures, Structural Dynamics and Materials Conference and Exhibit [C]． 2001：AIAA-2001-1536．