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Acta Aeronautica et Astronautica Sinica ›› 2025, Vol. 46 ›› Issue (23): 131483.doi: 10.7527/S1000-6893.2025.31483

• Fluid Mechanics and Flight Mechanics •    

Aerodynamic parameter identification of non-stall and near-stall flight data using recurrent neural networks

Zhe HUI1,2,3, Dongyue DU4, Yuting LIU1,2, Min CHANG1,2,3(), Junqiang BAI1,2,3,4   

  1. 1.Unmanned System Research Institute,Northwestern Polytechnical University,Xi’an 710072,China
    2.National Key Laboratory of Unmanned Aerial Vehicle Technology,Northwestern Polytechnical University,Xi’an 710072,China
    3.Integrated Research and Development Platform of Unmanned Aerial Vehicle Technology,Northwestern Polytechnical University,Xi’an 710072,China
    4.School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China
  • Received:2024-11-01 Revised:2024-12-16 Accepted:2025-04-02 Online:2025-04-11 Published:2025-04-10
  • Contact: Min CHANG E-mail:changmin@nwpu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(12402272);Natural Science Basic Research Program of Shaanxi Province(2024JC-YBQN-0024);Fundamental Research Funds for the Central Universities(D5000240030)

Abstract:

This paper proposes a new aerodynamic parameter identification method that combines a Gated Recurrent Unit (GRU) neural network model and the Gauss-Newton (GN) optimization algorithm, aiming to accurately identify the unknown aerodynamic parameters from longitudinal flight data generated by a self-developed small-sized Unmanned Aerial Vehicle (UAV) and ATTAS aircraft. The GRU network model was designed and then trained to characterize the chosen aircraft systems’ dynamics while avoiding numerical integrals of the postulated dynamic models. The GN optimization algorithm incorporates the trained GRU network model to obtain high-confidence identification results by iteratively minimizing a cost function concerning the unknown aerodynamic parameters. The measured flight data used in this study includes non-stall flight data from the self-developed UAV and near-stall flight data from the ATTAS aircraft. The study results demonstrate that the GRU network model can maintain reliable prediction effects for the non-stall and near-stall flight data by adjusting the corresponding network parameters such as the number of hidden layers, number of units in each hidden layer, dropout rate, time-step, and learning rate. Furthermore, the effectiveness of the proposed parameter identification method is confirmed by comparing the identified aerodynamic parameters with the corresponding wind tunnel or reference values.

Key words: aerodynamic parameter identification method, GRU network model, GN optimization algorithm, measured flight data, network parameters

CLC Number: