Shimmy Simulation and Virtual Verification for Civil Aircraft Landing Gear Airworthiness Certification

doi:10.3901/JME.2018.14.179

Abstract

Abstract: Landing gear shimmy is an important issue in modern civil aircraft development and airworthiness certification. For the complex nose landing gear of a civil aircraft, the three-dimensional(3D) simplified dynamic model is developed and shimmy characteristic parameters of the rigid-flexible coupling structures are obtained under different simulated shimmy flight test scenarios-typical taxing speed, weight/center of gravity and runway plank excitation. The landing gear stability in normal configuration is validated. The influence of the shimmy damping, tire relaxation length and cornering stiffness on the stability is analyzed respectively. Interpretation and induction of applicable Chinese Civil Aviation Regulations for shimmy, besides landing gear shimmy airworthiness certification practice are illustrated. A reasonable airworthiness verification and certification "Building Block Model", which includes airworthiness requirements capture, simulation, virtual test and test (equipment qualification test, landing gear system laboratory test and shimmy flight test), is proposed. The civil aircraft shimmy case study demonstrates the feasibility of virtual verification technology to assist the shimmy compliance finding.

Key words: airworthiness certification, landing gear, shimmy, structural dynamics, virtual test

CLC Number:

V216

HE Xufei, AI Jianliang, SONG Zhitao. Shimmy Simulation and Virtual Verification for Civil Aircraft Landing Gear Airworthiness Certification[J]. Journal of Mechanical Engineering, 2018, 54(14): 179-184.

References

[1] YUAN L,CHRIS H,SIMON A N,et al. Using continuation analysis to identify shimmy-suppression devices for an aircraft main landing gear[J]. Journal of Sound and Vibration,2017(408):234-251.
[2] THOTA P,KRAUSKOPF B,LOWENBERG M. Multi-parameter bifurcation study of shimmy oscillations in a dual-wheel aircraft nose landing gear[J]. Nonlinear Dynamics,2014,70(2):1675-1688.
[3] 张宁,殷国栋,陈南,等. 车辆动力学中的摆振问题研究现状综述[J]. 机械工程学报,2017,53(14):16-28. ZHANG Ning,YIN Guodong,CHEN Nan,et al. A state-of-the-art survey on shimmy problem in vehicle dynamics[J]. Journal of Mechanical Engineering,2017,53(14):16-28.
[4] KHAPANE P D. Gear walk instability studies using flexible multibody dynamics simulation methods in SIMPACK[J]. Aerospace Science and Technology,2006,40(1):19-25.
[5] TOURAJIZADEH H,ZARE S. Robust and optimal control of shimmy vibration in aircraft nose landing gear[J]. Aerospace Science and Technology,2016(50):1-14.
[6] TIAN M,GABOR S,DENES T,et al. Model establishment and parameter analysis on shimmy of electric vehicle with independent suspensions[J]. Procedia IUTAM,2017(22):259-266.
[7] PRITCHARD J. Overview of landing gear dynamics[J]. Journal of Aircraft,2001,38(1):130-137.
[8] CHEN Dawei,GU Hongbin. A summary of landing gear shimmy control and experimental study[J]. Aircraft Design,2011(2):38-41.
[9] FENG Fei,NIE Hong,ZHANG Ming,et al. Effect of torsional damping on aircraft nose landing-gear shimmy[J]. Journal of Aircraft,2015,52(2):561-568.
[10] SURA N K,SURYANARAYAN S. Lateral stability of aircraft nose-wheel landing gear with closed-loop shimmy damper[J]. Journal of Aircraft,2009,46(2):505-509.
[11] ATABAY E, OZKOL I. Application of a magnetorheological damper modeled using the current-dependent Bouc-Wen model for shimmy suppression in a torsional nose landing gear with and without freeplay[J]. Journal of Vibration and Control,2014,20(11):1622-1644.
[12] ZHANG Ming,NIE Hong,ZHU Rupeng. Design and dynamics analysis of anti-skid braking system for aircraft with four-wheel bogie landing gears[J]. Chinese Journal of Mechanical Engineering,2011,24(2):277-283.
[13] HOWCROFT C,LOWENBERG M,NEILD S,et al. Shimmy of an aircraft main landing gear with geometric coupling and mechanical freeplay[J]. Journal of Computational and Nonlinear Dynamics,2015,10(5):051011.
[14] THOTA P,KRAUSKOPF B,LOWENBERG M,et al. Influence of tire inflation pressure on nose landing gear shimmy[J]. Journal of Aircraft,2010,47(5):1697-1706.
[15] 中国民用航空局. CCAR-25-R4,运输类飞机适航标准[S]. 北京:中国民用航空局,2011. Civil Aviation Administration of China. CCAR-25-R4,Airworthiness standards for transport aircraft[S]. Beijing:CAAC,2011.