An Improved Nonlinear Aerodynamic Derivative Model of Aircraft at High Angles of Attack
The classical aerodynamic derivative model is widely used in flight dynamics, but its application is extremely limited in cases with complicated nonlinear flows, especially at high angles of attack. A modified nonlinear aerodynamic derivative model for predicting unsteady aerodynamic forces and mome...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | International Journal of Aerospace Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/5815167 |
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| _version_ | 1832560504223039488 |
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| author | Mi Baigang Yu Jingyi |
| author_facet | Mi Baigang Yu Jingyi |
| author_sort | Mi Baigang |
| collection | DOAJ |
| description | The classical aerodynamic derivative model is widely used in flight dynamics, but its application is extremely limited in cases with complicated nonlinear flows, especially at high angles of attack. A modified nonlinear aerodynamic derivative model for predicting unsteady aerodynamic forces and moments at a high angle of attack is developed in this study. We first extend the higher-order terms to describe the nonlinear characteristics and then introduce three more influence parameters, the initial angle of attack, the reduced frequency, and the oscillation amplitude, to correct the constant aerodynamic derivative terms that have higher-order polynomials for these values. The improved nonlinear aerodynamic derivative model was validated by using the NACA 0015 airfoil and the F-18 model. The results show that the improved model has a higher prediction ability at high angles of attack and has the ability to predict the aerodynamic characteristics of other unknown states based on known unsteady aerodynamic data, such as the initial angle of attack, reduced frequency, and oscillation amplitude. |
| format | Article |
| id | doaj-art-132b96f0611b476fa82bc41d6ce9e62a |
| institution | Kabale University |
| issn | 1687-5966 1687-5974 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Aerospace Engineering |
| spelling | doaj-art-132b96f0611b476fa82bc41d6ce9e62a2025-02-03T01:27:20ZengWileyInternational Journal of Aerospace Engineering1687-59661687-59742021-01-01202110.1155/2021/58151675815167An Improved Nonlinear Aerodynamic Derivative Model of Aircraft at High Angles of AttackMi Baigang0Yu Jingyi1School of Aeronautics, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, ChinaThe classical aerodynamic derivative model is widely used in flight dynamics, but its application is extremely limited in cases with complicated nonlinear flows, especially at high angles of attack. A modified nonlinear aerodynamic derivative model for predicting unsteady aerodynamic forces and moments at a high angle of attack is developed in this study. We first extend the higher-order terms to describe the nonlinear characteristics and then introduce three more influence parameters, the initial angle of attack, the reduced frequency, and the oscillation amplitude, to correct the constant aerodynamic derivative terms that have higher-order polynomials for these values. The improved nonlinear aerodynamic derivative model was validated by using the NACA 0015 airfoil and the F-18 model. The results show that the improved model has a higher prediction ability at high angles of attack and has the ability to predict the aerodynamic characteristics of other unknown states based on known unsteady aerodynamic data, such as the initial angle of attack, reduced frequency, and oscillation amplitude.http://dx.doi.org/10.1155/2021/5815167 |
| spellingShingle | Mi Baigang Yu Jingyi An Improved Nonlinear Aerodynamic Derivative Model of Aircraft at High Angles of Attack International Journal of Aerospace Engineering |
| title | An Improved Nonlinear Aerodynamic Derivative Model of Aircraft at High Angles of Attack |
| title_full | An Improved Nonlinear Aerodynamic Derivative Model of Aircraft at High Angles of Attack |
| title_fullStr | An Improved Nonlinear Aerodynamic Derivative Model of Aircraft at High Angles of Attack |
| title_full_unstemmed | An Improved Nonlinear Aerodynamic Derivative Model of Aircraft at High Angles of Attack |
| title_short | An Improved Nonlinear Aerodynamic Derivative Model of Aircraft at High Angles of Attack |
| title_sort | improved nonlinear aerodynamic derivative model of aircraft at high angles of attack |
| url | http://dx.doi.org/10.1155/2021/5815167 |
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