Aeroelastic analysis of flexible large aspect ratio wing
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摘要: 高空长航时飞机普遍具有大展弦比机翼,其气动弹性问题尤为突出.考虑机翼结构的几何非线性对结构刚度的影响和机翼平面变形对非定常气动力的影响,采用准模态的思想进行大变形下的振动工程分析,并利用片条理论计算变形机翼的非定常气动力,然后进行颤振计算.以某型飞机机翼为例的计算表明,随变形幅度增大,机翼的颤振速度有明显的下降.Abstract: Aeroelastic phenomena are significant for high-altitude long-endurance aircrafts for the large aspect ratio wing. The effect of structural geometric-nonlinear on wing dynamic characteristics and the changes of unsteady aerodynamics due to the large static deformation of wing were studied. The wing flutter was carried out based on the result of large deflected wing vibration analysis using quasi-linear method and its unsteady aerodynamics by strip theory. Through the calculation of the wing, it can be concluded that the flutter speed decreases significantly under large deformation.
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Key words:
- flutter /
- aeroelasticity /
- geometric-nonlinear /
- large aspect ratio wing /
- unsteady aerodynamics
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