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Vibration, performance, flutter and forced response characteristics of a large-scale propfan and its aeroelastic model

机译:大型螺旋桨的振动,​​性能,颤振和强迫响应特性及其气动弹性模型

摘要

An investigation of the vibration, performance, flutter, and forced response of the large-scale propfan, SR7L, and its aeroelastic model, SR7A, has been performed by applying available structural and aeroelastic analytical codes and then correlating measured and calculated results. Finite element models of the blades were used to obtain modal frequencies, displacements, stresses and strains. These values were then used in conjunction with a 3-D, unsteady, lifting surface aerodynamic theory for the subsequent aeroelastic analyses of the blades. The agreement between measured and calculated frequencies and mode shapes for both models is very good. Calculated power coefficients correlate well with those measured for low advance ratios. Flutter results show that both propfans are stable at their respective design points. There is also good agreement between calculated and measured blade vibratory strains due to excitation resulting from yawed flow for the SR7A propfan. The similarity of structural and aeroelastic results show that the SR7A propfan simulates the SR7L characteristics.
机译:通过应用可用的结构和气弹分析代码,然后关联测量和计算的结果,对大型螺旋桨SR7L及其气弹模型SR7A的振动,性能,颤振和强制响应进行了研究。叶片的有限元模型用于获得模态频率,位移,应力和应变。然后,将这些值与3-D非稳态提升表面空气动力学理论结合起来用于随后的叶片空气弹性分析。两种模型的测量频率和计算频率以及模式形状之间的一致性非常好。计算出的功率系数与低推进比下测得的功率系数具有很好的相关性。颤振结果表明,两个螺旋桨在各自的设计点都稳定。由于SR7A螺旋桨偏航流引起的激振,计算出的叶片振动应变与测量出的叶片振动应变之间也有很好的一致性。结构和气动弹性结果的相似性表明,SR7A螺旋桨模拟了SR7L特性。

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