ФЛАТТЕР ПЛОСКИХ ПАНЕЛЕЙ ОБШИВКИ, ИМЕЮЩИХ НЕПРЯМОУГОЛЬНУЮ ФОРМУ

Abstract

In this paper, we investigate a single-mode flutter of panels of different shapes; namely, trapezoidal and parallelogram plates are considered. The panel is modeled as simply supported elastic plate, the air is considered inviscid and perfect. To calculate flutter boundaries in the first two eigenmodes, we use the energy method. First, to verify this method for panel flutter calculations, flutter boundaries of rectangular panels are calculated and compared with the full aeroelastic solution. Excellent correlation between the two methods is obtained. Next, trapezoidal and parallelogram panels with different skew angles are considered. We show that flutter boundaries for trapezoidal plates vary slightly in comparison with the rectangular plates. On the contrary, for parallelogram plates even at a small skew angle the aeroelastic stability increases significantly. The results obtained show that making the aircraft skin panels in the shape of a parallelogram can be an effective method of single-mode flutter suppression at transonic and low supersonic flight speeds.