关键词: 弹性飞机, 飞行仿真, 飞行力学, 气动弹性, 刚弹耦合, 非线性气动力

Abstract:

Modern aircrafts increasingly exhibit characteristics of light structure， large flexibility， and low damping， while the aeroelastic effect has become an important factor， enabling significantly different motion responses of flexible aircraft from those of rigid aircraft. However， the demand to solve rigid-elastic coupling equations increases the difficulty in modeling and validation of flexible aircraft. This paper proposes a patch module method suitable for flight simulations of flexible aircraft. This "patch module" consists of decomposition of generalized aerodynamic forces and superposition of incremental measurement signals of elastic vibrations. Then it is embedded into flight simulations of six-degree-of-freedom full equations of rigid aircraft to transform them into those of flexible aircraft. This method fully utilizes the original model of rigid aircraft， simplifies the modeling process of flexible aircraft， and contributes to the development of subsequent projects. Numerical results of an unmanned aerial vehicle with a large aspect ratio are obtained through flight simulations of flexible aircraft based on the patch module method， and the corresponding trim methods are introduced. The feasibility and accuracy of the flight simulation method are validated during the study of maneuvering response， aerodynamic nonlinearity and aeroservoelastic stability.

Key words: flexible aircraft, flight simulation, flight dynamics, aeroelasticity, rigid-elastic coupling, nonlinear aerodynamics