MODELING OF SHAKER-STRUCTURE COUPLING SYSTEM AND ITS APPLICATION IN GROUND FLUTTER SIMULATION TEST

Ground flutter simulation test (GFST) is an experimental method in the aerospace field that employs shakers to apply real-time condensed aerodynamic force to an actual structure to predict its flutter. While the controller plays an essential role in GFST, studying the mechanism of the controller can help us better design controllers. This paper proposed a modeling method of shaker-structure coupling system (SSCS)for the controllers. The proposed method is specifically suitable for linear elastic structures that follow the principle of mode superposition, and where the power amplifier of the shaker works in current mode. Ground tests of a cantilever beam and a trapezoidal elastic aluminum plate were conducted to validate the feasibility and accuracy of the method. The modeling of SSCS was utilized into the numerical simulation of GFST of the plate. And the results show that for the simple bending-torsion coupled flutter model, if the bandwidth of the controller covers the flutter frequency of the model, the controller can be used in GFST.