【摘要】 气动导数识别目前在识别算法、试验技术等方面均有诸多进展,但有关气动导数之间的关系则很少涉及。在国内外文献中总结气动导数之间关系的理论依据的基础上,根据Theodorsen薄机翼理论推导出了以无量纲折减频率为参量的气动导数之间的关系,在紊流风场中完成了薄平板节段模型的风洞试验,采用随机子空间法进行气动导数识别,获得相应的气动导数之间的关系。最后,基于前人和笔者的试验结果,定义了气动导数之间关系的适用范围,给出了一些可供有关研究和设计人员参考的有意义的结论。更多还原

【Abstract】 Accurate determination of flutter derivatives for large-span bridges is of critical importance to ensure the reliability of the flutter analysis.Although much progress has been achieved both in the identification and testing methodologies of flutter derivatives,inadequate attention has been paid to the relationships among the flutter derivatives.In the paper,after introducing a brief summary of the researches on this aspect,new relationships among flutter derivatives for the thin flat plate model were proposed based on Theodorsen’s aerodynamic force theory.The results from the analytical formulas considering the influence of reduced frequency,were compared with the wind tunnel test results,determined by the covariance-driven stochastic subspace identification method.The validation of the relationships among flutter derivatives was experimentally verified and the possible application of them was discussed.更多还原