Resonance mechanism analysis of flexible shaft transmission system

In modern aircraft, the deployment and retraction of thrust reverser cowls are facilitated by multiple linear actuators operating in concert. This configuration, while effective, introduces synchronization challenges due to the simultaneous action of the actuators. To address this issue, flexible steel shafts are incorporated to interconnect the actuators, and a closed-loop control system is implemented to manage their operation. The inherent low stiffness non-linearity of the flexible shafts, combined with the system's multiple inertias, significantly increases the susceptibility of motor speed and load speed to resonance. This paper introduces a prototypical transmission system to elucidate these dynamics. It constructs a dual-inertia servo system model, investigates the principal factors contributing to system resonance, and extends this to a more comprehensive three-inertia model. Through rigorous simulation experiments, the paper validates the developed model, thereby laying a theoretical foundation for the design of more robust control strategies.