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颤振模型设计时难以实现完全的动力学相似,需要对颤振主要模态进行合理选择。采用数值分析方法,对颤振模型设计时主要模态的选取问题进行研究。通过各阶模态振型下气动刚度系数的比较、指定运动形式下广义非定常气动力的计算和不同模态截断下颤振结果的收敛特性分析,研究了颤振分析时不同模态运动之间的相互影响,对模态运动引起的气动力和颤振特性变化进行评估。以高超翼面模型为研究对象的数值算例结果表明,几种分析方法所判断的颤振主要模态基本一致。其中基于振型的广义气动刚度系数参数,避免了非定常气动力的计算,可作为颤振模型设计或颤振分析时主要模态选取的快速判断方法。
It is difficult to achieve complete dynamic similarity in the design of the flutter model, which requires a reasonable choice of the main mode of flutter. The numerical analysis method is used to study the selection of the main modes in the design of the flutter model. Through the comparison of the aerodynamic stiffness coefficients under different modal vibration modes, the calculation of the generalized unsteady aerodynamics under the specified motion form and the convergence characteristics of the flutter results under different modal truncations, the effects of different modes of motion The interaction between the aerodynamic and flutter characteristics caused by modal motion is evaluated. Numerical examples of the super high airfoil model show that the main modes of flutter determined by several analytical methods are basically the same. Which based on the vibration mode of generalized pneumatic stiffness coefficient parameters, to avoid the calculation of unsteady aerodynamic, flutter model can be used as the analysis or chatter analysis of the main modal selection of fast judgment method.