Aeroelastic Instability of Cantilever Wing with Added Engine Mass and Thrust Loads Under the Gust Envelope

Abstract

Dynamic analysis and instability prediction of immersed bodies under variable loading conditions is an important issue in fluid dynamics. This work presents the dynamic analysis of a wing section by considering the engine mass and the resulting thrust effect using a distributed parameter model. The equations of motion of cantilever wing are obtained using the extended Hamilton’s principle by accommodating the engine mass and the follower force terms. Initially, the stability regions of the clean wing without engine are identified using modal reduction scheme. The critical frequencies and flutter speed obtained from the model are validated with available results. In order to study the influence of other parameters such as position of engine mass, number of store masses and the generated thrust, a series of parametric studies are conducted. To make the study more realistic, the cantilever wing with engine mass is further subjected to a vertical discrete gust loading. It is found that the model is reliable and interactive in further analysis.