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Material anisotropy and sweep effects on the hydroelastic response of lifting surfaces

机译：材料各向异性和扫掠效应升降表面的液体响应

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摘要

The objective is to study the hydroelastic response of composite cantilevered plates as a combined function of the material anisotropy and geometric sweep angle. For plates with a positive incidence angle, if the fibers are aligned towards the leading edge, nose-down deformations occur, which reduces lift and delays static divergence. If the fibers are aligned towards the aft, nose-up deformations occur, and the deformations increase (decrease) with forward (backward) sweep. For the cases examined, coupled-mode flutter was observed for plates in air. In water, however, flutter was caused by the emergence of a new low-frequency mode at high flow speeds. Backward sweep accelerates flutter in air, but delays flutter in water. The effect of the sweep angle was found to be secondary in contrast to the effective fiber angle. For the plates in air, the highest critical speed corresponds to a foil with a slight forward sweep with fibers aligned along the spanwise direction. For the same plate in water, a backward swept hydrofoil with fibers aligned toward the inflow was found to be the best combination to avoid divergence and flutter.
机译：目的是研究复合悬臂板的水力弹性响应，作为材料各向异性和几何扫描角度的组合作用。对于具有正入射角的平板，如果纤维朝向前缘对齐，则发生下压变形，从而减少升力并延迟静态发散。如果纤维朝向AFT对齐，则发生鼻升变形，并且变形增加（减小）向前（向后）扫描。对于所检查的情况，在空气中观察到耦合模式颤动。然而，在水中，通过高流速的新低频率模式的出现引起了颤动。向后扫描加速空气中的颤动，但在水中延迟颤动。发现扫描角度的效果与有效纤维角形成次级。对于空气中的板，最高临界速度对应于箔，沿沿南部方向对准的纤维略微扫描。对于在水中的相同板，发现朝向流入的纤维的侧向扫掠水力是最好的组合，以避免发散和颤动。

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