未知振动对弹性飞机结构有显著的负面影响.因此,有必要对结构的振动响应进行准确的预测。然而,当目标点存在激励载荷时,大多数现有方法的预测效果较差.为了克服这一缺点,我们提出了一种基于全局传递函数(global transfer function,GTF)...未知振动对弹性飞机结构有显著的负面影响.因此,有必要对结构的振动响应进行准确的预测。然而,当目标点存在激励载荷时,大多数现有方法的预测效果较差.为了克服这一缺点,我们提出了一种基于全局传递函数(global transfer function,GTF)的响应预测方法.GTF直接使用参考点的响应预测目标点响应,不需要载荷参与,也不依赖于动力学模型.此外,目标点激励的贡献也可以得到有效的补偿和校正.我们通过有限元模型和实际系统的实验,验证了GTF的有效性和准确性.详细研究了传感器位置、传感器数量、激励类型、激励方式和噪声等因素的影响.并对GTF和基于直接传递函数(direct transfer functio,DTF)的响应预测结果进行了比较.结果表明,GTF能有效预测振动响应,满足工业要求.因此,GTF是一种很有前途的弹性飞机响应预测方法.展开更多
In this paper, Duhamel's integral of the indicial function is used to describe unsteady aerodynamic forces. An identification method to estimate the aerodynamic forces is proposed for elastic aircraft by the maxim...In this paper, Duhamel's integral of the indicial function is used to describe unsteady aerodynamic forces. An identification method to estimate the aerodynamic forces is proposed for elastic aircraft by the maximum likelihood algorithm with estimated sensi tivities. A numerical example is given and the calculated results show the effectiveness of this method.展开更多
基金supported by Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(Grant No.Cx2022002)the National Natural Science Foundation of China(Grant No.11872312).
文摘未知振动对弹性飞机结构有显著的负面影响.因此,有必要对结构的振动响应进行准确的预测。然而,当目标点存在激励载荷时,大多数现有方法的预测效果较差.为了克服这一缺点,我们提出了一种基于全局传递函数(global transfer function,GTF)的响应预测方法.GTF直接使用参考点的响应预测目标点响应,不需要载荷参与,也不依赖于动力学模型.此外,目标点激励的贡献也可以得到有效的补偿和校正.我们通过有限元模型和实际系统的实验,验证了GTF的有效性和准确性.详细研究了传感器位置、传感器数量、激励类型、激励方式和噪声等因素的影响.并对GTF和基于直接传递函数(direct transfer functio,DTF)的响应预测结果进行了比较.结果表明,GTF能有效预测振动响应,满足工业要求.因此,GTF是一种很有前途的弹性飞机响应预测方法.
文摘In this paper, Duhamel's integral of the indicial function is used to describe unsteady aerodynamic forces. An identification method to estimate the aerodynamic forces is proposed for elastic aircraft by the maximum likelihood algorithm with estimated sensi tivities. A numerical example is given and the calculated results show the effectiveness of this method.
