Modeling of shaker-structure coupling system and its application in ground aeroelastic stability test

ifasd2024 Tracking Number 102

Ground Aeroelastic Stability Test (GAST) is an experimental method in the field of aerospace engineering that employs shakers to apply real-time condensed unsteady aerodynamic forces to an actual structure, evaluating its aeroelastic stability. GAST includes the ground flutter test and the ground aeroservoelastic test . However, existing work in this area lacks in-depth research on the underlying mechanism, particularly the force controller design problem arising from the coupling of the shaker and structure. This paper aims to address this gap by studying the modeling method of shaker-structure coupling system. The proposed method is specifically suitable for linear elastic structures that adhere to the principle of mode superposition, and where the power amplifier of the shaker works in current mode. To validate the feasibility and accuracy of this modeling method, ground tests of a cantilever beam and a wing were conducted. Applying this modeling method to the simulation of the GAST facilitates further research on force controller design methods, shaker-structure coupling interference, and system delay. In this paper, we integrate the shaker-structure coupling model into the simulation of a wing flutter ground test, conducting a study on the factors influencing the accuracy of flutter results.