平板的颤振参数研究

基于平板颤振理论 ,建立了颤振双参数优化模型 ;提出了搜索该优化模型最优解的混沌新方法 ,该方法利用混沌的内在随机性和遍历性来获得全局最优解 ;并详细给出了图解法和迫近法搜索优化模型最优解的步骤 .经算例验证 ,上述 3种方法计算简便 ,精度高 ,为平板颤振频率、颤振风速和折算风速等颤振参数的确定提供了新的有效途径 .混沌方法人为参与程度低 ,稳定性强 ,可以方便准确地绘出平板各种颤振参数的诺模图

Research on Flutter Parameters of Flat Plate

Based on the flutter theory of flat plate,a new optimization model that involving twin undetermined flutter parameters is proposed.A new chaotic search method for acquiring the optimal solution in the global space is also developed by taking advantage of its intrinsic ergodicity and randomicity.The steps of diagrammatical method and approximation method for the optimization model are presented in details.An example shows that the three methods are valid for attaining satisfactory computational precision with convenience,and proves that they are new effective approaches for searching such flutter parameters as critical oscillation frequency,wind velocity and reduced wind velocity of flat plate.The chaotic search method needs little manipulation and possesses superior robustness and the nomograms of various flutter parameters of flat plate can be plotted conveniently and accurately.