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Unsteady Aerodynamic Modeling Based on POD-ARX
Joint Authors
Wang, Xiaopeng
Zhang, Chen’an
Liu, Wen
Wang, Famin
Ye, Zhengyin
Source
International Journal of Aerospace Engineering
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-09-20
Country of Publication
Egypt
No. of Pages
14
Abstract EN
The lack of stability is a problem encountered when applying the classical POD-Galerkin method to problems of unsteady compressible flows around a moving structure.
To solve this problem, a hybrid reduced-order model named POD-ARX is constructed in this paper.
The construction of this model involves two steps, including first extracting the fluid modes with the POD technique and then identifying the modal coefficients with the ARX model.
The POD modes with the block of all modified primitive variables are extracted from the system response to the training signal.
Once the POD modes are obtained, the snapshots are projected on these modes to determine the time history of modal coefficients and the resulting modal coefficients are used to identify the parameters of ARX model.
Then, the ARX model is used to predict the modal coefficients of the system response to the validation signal.
Sample two-dimensional aerodynamic force calculations are conducted to demonstrate this method.
Results show that this method can produce a stable and accurate prediction to the aerodynamic response with significant improvement of computational efficiency for linear and even some nonlinear aerodynamic problems.
In addition, this method also shows good wide-band characteristics by using the “3211” multistep signal as the training signal.
American Psychological Association (APA)
Wang, Xiaopeng& Zhang, Chen’an& Liu, Wen& Wang, Famin& Ye, Zhengyin. 2018. Unsteady Aerodynamic Modeling Based on POD-ARX. International Journal of Aerospace Engineering،Vol. 2018, no. 2018, pp.1-14.
https://search.emarefa.net/detail/BIM-1167419
Modern Language Association (MLA)
Wang, Xiaopeng…[et al.]. Unsteady Aerodynamic Modeling Based on POD-ARX. International Journal of Aerospace Engineering No. 2018 (2018), pp.1-14.
https://search.emarefa.net/detail/BIM-1167419
American Medical Association (AMA)
Wang, Xiaopeng& Zhang, Chen’an& Liu, Wen& Wang, Famin& Ye, Zhengyin. Unsteady Aerodynamic Modeling Based on POD-ARX. International Journal of Aerospace Engineering. 2018. Vol. 2018, no. 2018, pp.1-14.
https://search.emarefa.net/detail/BIM-1167419
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1167419