基于颤振试飞数字孪生扫频数据重构的模态参数估计

doi:10.7527/S1000-6893.2025.31602

Abstract

Abstract:

During the digital twinning flight test， high-quality flight test data is used to fuse the digital model with the actual flight test data. In order to eliminate the effect of turbulence excitation and improve the accuracy of subsequent signal processing conclusions， a new method for estimating swept frequency response modal parameters is proposed based on the reconstruction of flutter flight test digital twinning data. First， the measured response is reconstructed in the time domain， and it is separated into two parts： the structural response caused purely by the swept and the structural response excited by turbulence. Then， the subspace algorithm is used to identify the modal parameters of the two separated response data respectively. Finally， the proposed method is verified by simulation and measured data. The results show that the proposed method can obtain high-quality test flight data that meets the requirements of virtual-real fusion in digital twins， after data reconstruction， more accurate and reliable identification results can be obtained； at the same time， due to the separation of turbulent response and the unique broadband characteristics of turbulence， the method can also effectively identify modes outside the swept frequency range.

Key words: digital twin flight test, swept excitation, turbulence excitation, signal reconstruction, modal parameter identification

CLC Number:

V217⁺.33

Jialiang HU, Jiangpeng WU, Sixu HUO, Yidi GAO, Hua ZHENG. Modal parameter estimation based on reconstruction of digital twin sweep data in flutter flight test[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(19): 531602.

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References 22

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模态参数	模态1	模态2	模态3
特征频率/Hz	9	19	40
阻尼比/%	4	6	9

应用的方法	应用的数据	特征频率/Hz			阻尼比/%
应用的方法	应用的数据	模态1	模态2	模态3	模态1	模态2	模态3
SSI	原始响应信号	9.071	18.976		3.722	4.889
误差/%		0.79	0.13		6.95	18.52
SSI	重构的紊流响应	9.007	18.979	40.060	3.891	5.607	8.920
误差/%		0.08	0.11	0.15	2.73	6.55	0.89
DSI	原始激励与响应信号	9.044	19.121		3.725	6.110
误差/%		0.49	0.64		6.88	1.83
DSI	原始激励信号及重构的扫频响应	8.987	19.017		3.945	5.951
误差/%		0.14	0.09		1.38	0.82
真值		9	19	40	4	6	9

数据	子空间算法	特征频率/Hz			阻尼比/%
数据	子空间算法	模态1	模态2	模态3	模态1	模态2	模态3
截断的试飞数据	不考虑扫频	3.713	8.834		3.77	0.504	1.122
截断的试飞数据	不考虑紊流	4.110	8.759		2.708	1.011
重构的紊流响应	不考虑扫频	4.021	8.786	10.353	2.193	0.958
重构的扫频响应	不考虑紊流	3.954	8.776		1.625	0.994

Modal parameter estimation based on reconstruction of digital twin sweep data in flutter flight test

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