| Citation: | CAI Yuhong, LIU Gang, HONG Guanxinet al. Aerodynamic and flight dynamic iterative simulation method of a joined wing aircraft[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(4): 779-791. doi: 10.13700/j.bh.1001-5965.2020.0022(in Chinese)
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An aerodynamic component-oriented flight dynamic model of joined wing aircraft was established based on the joined wing aircraft aerodynamic force and moment distribution characteristic, and a simulation platform is established by combining the computational fluid dynamics and flight dynamic simulation method. The entire simulation is spatially discretized with time steps, and is executed by iterating Computational Fluid Dynamics (CFD) calculation along with the above joined wing aircraft flight dynamic model at each time step. Moreover, the platform is able to output the change of variables of interest, such as aerodynamics, mechanics, attitude and the space track of all components throughout the entire simulation process. Based on the dynamic response of the platform to different input signals, the longitudinal and lateral dynamic characteristics of the joined wing aircraft are analyzed. The simulation results show that the joined wing aircraft is longitudinally stable, but is not laterally stable. Lateral and directional motion couple clearly, and the yaw and side slip motion oscillations are in line with the main characteristics of the Dutch roll. The developed platform can provide a useful guideline for investigating the ontology system model, flight quality, flight safety analysis and flight dynamic response characteristics of the joined wing aircraft.
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