Simulation of aeroelastic limit-cycle oscillations of aircraft wings with stores

Aircraft wings carrying stores are susceptible to nonlinear aeroelastic limit-cycle oscillations, which can lead to reduced flight and mission performance. Limit-cycle-oscillation dynamics and control simulation studies, although of great importance, are often based on simplified typical-section airfoil models. In this work, the more accurate beam- rod representation is used to capture the spanwise varying displacement of a wing with store. The spanwise variation of wing geometry and structural properties, as well as the presence of multiple stores on rigid or flexible mounts, is efficiently modeled by the primitive-modes approach. Aeroelastic limit-cycle oscillation due to structural nonlinearity is demonstrated via time-marching simulations, as well as the computationally more efficient harmonic-balance method. Some novel forms of limit-cycle-oscillation behavior are observed as the model parameters are varied, and these are explained in terms of the flutter/divergence properties of the base linear aeroelastic system. Copyright

Duke Scholars

Author Earl H. Dowell Thomas Lord Department of Mechanical Engineering and Materia ...