地面颤振模拟试验中加载系统动态特性的影响研究

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.