Identification of an Airfoil-Store System with Cubic Nonlinearity via Enhanced Response Sensitivity Approach
Identification of an Airfoil-Store System with Cubic Nonlinearity via Enhanced Response Sensitivity Approach
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DOI：
10.2514/1.j057195
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发表时间：
2018-08
期刊：
影响因子：
2.5
通讯作者：
Guang Liu;L. Wang;J. Liu;Y. Chen;Zhengqi Lu
中科院分区：
文献类型：
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作者：
Guang Liu;L. Wang;J. Liu;Y. Chen;Zhengqi Lu
本文研究了具有三次非线性的机翼-外挂物系统的参数辨识问题。非线性翼型系统的非线性气动弹性行为依赖于翼型的参数，因此在进行气动弹性分析之前，必须准确识别翼型的结构参数。机翼-外挂物系统的辨识问题被建模为一个非线性最小二乘优化问题。增强的响应灵敏度方法已被公认为参数识别与时域响应数据，并将在本工作中跟进。为此，通过数值积分获得非线性运动方程的自主振动响应，然后同样计算响应相对于未知参数的灵敏度。数值试验表明了该方法的有效性、收敛性、对初始参数的敏感性以及测量噪声的影响。
This paper presents an investigation on parameters identification of an airfoil-store system with cubic nonlinearity via enhanced response sensitivity approach. The nonlinear aeroelastic behavior of the nonlinear airfoil system depends on the airfoil’s parameters, and thus the structural parameters of the airfoil should be identified accurately before aeroelastic analysis. The identification problem of the airfoil-store system is modeled as a nonlinear least-squares optimization problem. The enhanced response sensitivity approach has been recognized for parameter identification with time domain response data and is to be followed up in the present work. To do so, the autonomous vibration response of the nonlinear motion equation is obtained by the numerical integration, and then the response sensitivity with respect to the unknown parameters is calculated likewise. Numerical tests are performed to show the effectiveness, the convergence, the sensitivity to initial parameter values, and measurement noises ...