Abstract
In view of the large maneuvering overload of the rotor system in Unmanned Aerial Vehicle (UAV), the dynamic characteristics of rotor system under large maneuvering overload conditions were analyzed in this paper. The finite element model of rotor system under large maneuvering overload was first established by Timoshenko beam element theory and finite element method. The motion differential equations of the rotor system were derived by Lagrange equation, and the additional damping matrix, stiffness matrix and excitation force were obtained. Critical speeds and unbalance response were calculated by characteristic equation method and Newmark-β numerical integration method respectively. The calculation results showed that the additional damping and stiffness leaded the critical speeds of the rotor system to change under large maneuvering flight, and the additional excitation force resulted in a certain static displacement of the whirling orbits.
Highlights
The maneuvering overload of mainstream fighters is generally less than 9 g because of the pilot's tolerance ability
The motion differential equations of the rotor system under arbitrary maneuvering conditions were first derived by beam element theory, finite element method and Lagrange equation, and the critical speeds and unbalance response were calculated by characteristic equation method and Newmark-β numerical integration method in this paper
The simulation results showed that the maneuvering flight of the aircraft will have an important impact on the dynamic characteristics of the rotor system
Summary
The maneuvering overload of mainstream fighters is generally less than 9 g because of the pilot's tolerance ability. Compared with the traditional fighters, the UAV does not need to consider the tolerance ability limit of the human body. In order to improve the maneuverability greatly, the maneuvering overload of the UAV will far surpass 9 g in the future, and higher requirements are needed for the rotor system in the UAV’s engine than in traditional fighters, it is necessary to study the dynamic characteristics of the rotor system under large overload conditions (10 g-30 g). A lot of research has been done on dynamic characteristics of rotor system under maneuvering flight by many scholars. The dynamic characteristics of rotor system were analyzed in this paper
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