Theoretical and experimental study on the dynamic behavior of spur gear transmission system during hovering maneuver flights

Gear transmission systems, a crucial component of aircraft power transmission, are subjected to time-varying additional inertial forces and gyroscopic moments in noninertial frame environments when the aircraft performs maneuvering flight actions. In this study, a noninertial frame dynamic model of the gear transmission system during hovering maneuver flights was established, and the accuracy of the theoretical model was verified through conducting hovering maneuver flight simulation experiments. The dynamic behavior of the gear transmission system housing, bearings, and shafts under different hovering maneuver flight parameters was studied. The findings reveal that the maneuvering acceleration of the carrier causes varying degrees of change in the vibration acceleration of the housing, the center distance of the gear pair, the bearing force, and the bending deformation of the shafts, among which the magnitude and direction of the radial bearing force and shaft bending deformation are significantly affected by the maneuvering acceleration. Moreover, the risk of failure can be mitigated through the adjustment of the inclination angle to minimize the bending deformation of the fragile shaft resulting from maneuvering acceleration.