Multibody Dynamic Approach of Flight Dynamics and Nonlinear Aeroelasticity of Flexible Aircraft

作者：Zhao Zhenjun^*; Ren Gexue

来源：AIAA Journal, 2011, 49(1): 41-54.

DOI：10.2514/1.45334

The flight and structural dynamics of a very flexible aircraft, especially while maneuvering, are more tied together than those of conventional aircraft. Hence, it is necessary to study the coupled effects of flight dynamics, aeroelasticity, and control. This paper presents a multibody dynamic approach in which the flexible aircraft is modeled as a feedback-controlled multibody system under aerodynamic forces. The governing equations of the system are established by combining the equations of a multibody system, the ONERA aerodynamic model, and that of controls. The trim state of the flexible aircraft is solved using a dynamic relaxation method around which the perturbation equation is derived and solved for system stability. To demonstrate the advantage of multibody dynamics in modeling the constrained system undergoing large displacements and rotations, the proposed approach is applied to the flexible aircraft in level flight and in the circling and dive loop climb maneuvers. Beyond the flutter boundary, the limit cycle oscillations response is solved, in which several interesting aspects of flexible aircraft flutter are revealed. In the end, the joint flutter and attitude control is used to suppress flutter response and stabilize attitude.

• 出版日期2011-1
• 单位清华大学