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本文对某大柔度民用飞机的机翼颤振特性进行了研究。通过建立梁架式机翼有限元模型,分析了各颤振型的相互作用关系。结果表明,机翼面内弯曲模态会与扭转模态相耦合,出现一种面内弯曲模态引起的、小翼参与的、与弯曲模态耦合的低速度小阻尼颤振型,对机翼颤振特性产生不利的影响。针对机翼面内刚度、扭转刚度、小翼重量的变参分析结果表明,考虑结构阻尼,或者减小小翼重量后,可显著提高面内小阻尼颤振型的颤振速度。
In this paper, the flutter characteristics of a large flexible civil aircraft wing were studied. By establishing the finite element model of the beam wing, the interaction between the flutter modes is analyzed. The results show that the in-plane flexural modes are coupled with the torsional modes, and a low-damping, low-damping flutter mode, which is caused by in-plane flexural modes and is involved with the winglets, is presented. Wing flutter characteristics have an adverse effect. Variable parameter analysis of the in-plane stiffness, torsional stiffness and winglet weight shows that the flutter speed of the in-plane small damping flutter can be significantly improved by considering the structural damping, or reducing the winglets weight.