Dynamic features of non-return mechanism in hatch door of amphibious aircraft

Abstract

Non-return mechanism is the key device that plays the role of braking in the opening and closing electric actuator of amphibious aircraft hatch door, in which there are two core components, namely ball-and-socket contact pair and multi-disc friction pair. The braking response characteristics of non-return mechanism directly determine the performance and operation safety of the hatch door. In this paper, the dynamic model of non-return mechanism is established considering the freedom of rotation-translation. Based on MATLAB/Simulink, the solution framework of the overall dynamic model is built. The dynamic response characteristics of non-return mechanism in the process of reverse load braking, forward load braking and continuous closing are analyzed. The braking time and the angular displacement of the output shaft in the braking phase have been presented. The simulation demonstrates that three pairs of friction pairs can realize effective braking under the given working conditions. Compared with the forward load braking, the reverse load braking has longer braking time and smaller angular displacement of the output shaft. This study provides a theoretical basis for the design and optimization of non-return mechanism.