Bending Deformation Of Shaft Research Articles

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.

Mixed-lubrication analysis of marine stern tube bearing considering bending deformation of stern shaft and cavitation

A mixed-lubrication model has been developed to study tribological characteristics of a marine stern tube bearing. The finite difference method is employed to obtain numerical solutions of the Reynolds equation using combined Newton–Raphson and iterative relaxation methods. The differential equation of deflection curve of the propeller shaft is used to describe the bending deformation of propeller shaft. The displacement superposition method is used to solve the differential equation of deflection. The influences of cavitation and different boundary conditions, the Reynolds boundary condition and Jacobsson–Floberg and Olsson (JFO) boundary condition, as well as the bending deformation of shaft, on the Stribeck Curves are discussed in this paper.

Natural mode of vibration of circular plate with solid shaft. (1st report. Correction of natural frequency under consideration of elastic deformation on boundary between circular plate and solid shaft, and bending deformation of shaft).

The authors used Mindlin's equation, and calculated the circular plate natural mode with a solid shaft under the boundary condition of a fixed inner diameter. As the result, the caclulated natural frequency of the low mode of the thick circular plate differed greatly from the one measured by model analysis. The causes were analyzed on the (1, 0) mode of vibration, which had the biggest error of 78 percent. It was revealed that the elastic deformation on the boundary between the circular plate and the solid shaft, and the bending deformation of the had a strong influence on the natural frequency. By taking both influences into account, the natural frequency of the (1, 0) mode was corrected to within a 5 percent error.