A study on the impact of dynamic characteristics of a loading system in ground flutter simulation

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (16) : 214-221.

ZHANG Guiwei1,TAN Guanghui2,XU Qinwei2,GU Yingsong1, YANG Zhichun1

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Abstract

Ground flutter simulation test is a semi-physical simulation test technique that obtains the flutter characteristics of the aircraft structure on the ground.Exciters are used to simulate the distributed aerodynamic loads on the structure.In this paper, the scale model of an all-moving fin was studied.The time-domain reduced order model of unsteady aerodynamics was obtained by optimizing the positions of a given number of sensors and shakers.Considering the dynamic characteristics of the exciter loading system, the ground flutter simulation and semi-physical simulation tests were carried out.An H-infinity robust controller was used to decouple the interaction between exciters and structure in semi-physical simulation experiments.The results show that the prediction of flutter boundary is underestimated when ignoring the dynamic characteristics of the exciter loading system.The flutter boundary obtained by the simulation agrees well with the semi-physical simulation test results, when taking the dynamic characteristics of the exciter loading system into account.It is indicated that the characteristics of the loading system should be included in ground flutter simulation.

Key words

aeroelasticity / ground flutter simulation / characteristics of the loading system / reduced order model / multi-exciters force control

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ZHANG Guiwei1,TAN Guanghui2,XU Qinwei2,GU Yingsong1, YANG Zhichun1. A study on the impact of dynamic characteristics of a loading system in ground flutter simulation[J]. Journal of Vibration and Shock, 2020, 39(16): 214-221

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