论文部分内容阅读
建立了一个新的非线性气动弹性模型,对低速流场中柔性悬臂板的后颤振响应特性进行了分析。建模中考虑了结构几何非线性、气动力非线性以及两者之间的强耦合效应。通过实验数据对所建立的气动弹性模型进行了验证。发现在低速流场中柔性悬臂板可能会以周期加倍的方式进入混沌运动。结构几何非线性效应和翼尖涡引起的非定常气动力效应对柔性悬臂板的结构响应有显著影响,而尾涡变形引起的非定常气动力对结构运动的影响较小。还研究了不同耦合算法的差异,给出了小展弦比大柔性结构非线性气动弹性数值仿真时耦合策略的选择依据。
A new nonlinear aeroelastic model is established to analyze the post-chatter response of flexible cantilever plate in low-velocity flow field. The structural geometry nonlinearity, aerodynamic nonlinearity and the strong coupling effect between the two are considered in the modeling. The aeroelastic model was established by experimental data. It is found that the flexible cantilever plate may enter the chaotic motion in a doubled cycle in a low velocity flow field. The geometric nonlinear effect of structure and unsteady aerodynamic effect caused by wingtip vortex have a significant effect on the structural response of flexible cantilever plate, while the unsteady aerodynamic forces induced by wake vortex deformation have less influence on the structural motion. The differences of different coupling algorithms are also studied, and the selection criteria of the coupling strategy for nonlinear aerodynamic elastic numerical simulation with large aspect ratio and small flexibility are given.