helicopter ground resonance analysis
The paper does numerical simulations of different simplified models of coupled-rotor-fuselage systems used in the past by researchers and show that the nonlinear behavior is fundamental to the system. JASCAR 0095-9812 LinkGoogle Scholar, [5] Johnson W., Helicopter Theory, Princeton Univ. Helicopter ground resonance is a highly non-linear dynamic problem involving complex interactions between the various parts of a helicopter and constituting a major design consideration. As an addition to slope landing studies in the past and investigations of non-linear landing gear effects, this work focuses on a . The text begins with a unique technical history of helicopter flight, and then covers basic methods of rotor aerodynamic analysis, and related issues associated with the performance of the helicopter and its aerodynamic design. 1 Aeromechanical stability analysis of a hybrid heavy lift multirotor vehicle in hover In this paper results of numerical analysis of the ground resonance are shown. Sources of nonlinearity can be geometrical (finite blade lead-lag motion) and . When ground resonance occurs, a helicopter becomes unbalanced when its skids or wheels touch the ground, according to a 2012 Federal Aviation Administration handbook for helicopter instructor pilots. Ground resonance occurs when the low frequency lag mode of the rotor (in the non-rotating frame) coalesces with a fuselage or body frequency. 19, No. PLEASE NOTE: We are currently experiencing issues with articles from the AIAA Journal not adding to our shopping cart (for transactional sales of individual articles only). : i j; • ! This paper presents a stability robustness analysis of the helicopter ground-resonance phenomenon. CrossrefGoogle Scholar, [8] Friedland B., Control System Design. Ground resonance is a dynamic instability caused by the interaction between the rotor and the airframe of a helicopter. 177.1–177.12. Keywords: Helicopter dynamics, Modeling, Ground Resonance, Nonlinear analysis, Co-ordinate transformations 1. Published under licence by IOP Publishing Ltd IOP Conference Series: Materials Science and Engineering, Volume 224, 4th International Conference on Mechanics and Mechatronics Research (ICMMR 2017)20-24 June 2017, Xi'an, China Helicopter Ground Resonance is a dynamic instability involving the coupling of the blades motion in the rotational plane (i.e. 24, No. Guo-cai, H, Jin-wu, X, Xiao-gu, Z. Ground esonancre monitoring 3 1 Introduction Ground resonance is an instability that may develop on helicopters when the rotor is spinning on or near the ground, and that may result in the destruction of the structure. helicopter rotor systems. ground resonance. In helicopter with hinged rotor, an unstable dynamic phenomenon known as ground resonance may occur, leading to the total destruction of the aircraft. doi:https://doi.org/10.4050/JAHS.14.33 JHESAK 0002-8711 CrossrefGoogle Scholar, [21] Masarati P., Muscarello V. and Quaranta G., “Linearized Aeroservoelastic Analysis of Rotary-Wing Aircraft,” 36th European Rotorcraft Forum, 2010. Fellow, Dipartimento di Ingegneria Aerospaziale, via La Masa 34. Simulation Analysis of Helicopter Ground Resonance Nonlinear Dynamics. NON-LINEAR GROUND RESONANCE OF A HELICOPTER DZYGADLO Zbigniew, KOWALECZKO Grzegorz Military University of Technology ul.
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