基于Volterra级数的非定常气动力降阶模型

为了满足气动伺服弹性分析与综合的需要,优化了一种基于Volterra级数的非线性非定常气动力降阶模型。通过CFD技术计算出的广义非定常气动力阶跃响应辨识出Volterra核,应用特征系统实现算法建立非定常气动力的状态空间模型,并将该模型应用于气动弹性计算。用气动弹性标准模型AGARD 445.6机翼对该降阶模型做了验证,结果表明这种方法可以快速准确地求解气动弹性问题。

Volterra-series-based reduced-order model for unsteady aerodynamics

In order to meet the demand of aeroservoelastic analysis and synthesis,a reduced-order model based on Volterra series for nonlinear unsteady aerodynamics is optimized.The volterra kernels are identified from the step response of generalized unsteady aerodynamics which is calculated by CFD(computational fluid dynamics).The unsteady aerodynamics space-state model is constructed by means of feature system realization algorithm and applied to aeroelastic calculation.The reduced-order model is validated on AGARD 445.6 wing which is a standard aeroelastic configuration.The results demonstrate that the method can solve aeroelastic problem rapidly and accurately.