Research on dynamic load sharing characteristics of double input face gear split-parallel transmission system

Abstract

The face gear power-split system has huge superiorities over the traditional transmission form in the application of modern rotorcraft, and it has become the research trend of the industry in recent years. Thus this paper took the double input face gear split-parallel transmission system used in the rotorcraft as the research target, and established its dynamics model through the lumped parameter theory. Based on the Newtonian second law, the dynamics equations were built and solved to gain the meshing forces and load sharing coefficients of the transmission system. Simultaneously, the impacts of the eccentric errors, support stiffness, and torsional stiffness on the load sharing characteristics were studied. The results show that the meshing forces and load sharing coefficients of each gear pair have periodic changes; the eccentric errors of each drive stage gear have only a significant effect on the corresponding drive stage. Moreover, the changes in the support stiffness of the split-torque shafts and double gear shafts mainly affect the load distribution of the parallel stage, and the shaft torsional stiffness is less sensitively to maintain load balance. In addition, the increment of the shaft stiffness increases the load sharing coefficients of the corresponding gear pairs.

A function method for static load-sharing analysis of multiple-branch power-split gearing system

“…Because when the error values are equal, the maximum influence of one gear installation eccentricity error does not exceed the maximum influence of its manufacturing eccentricity error; and the eccentricity error of the sun gear has an influence on the load-sharing of each branch, but the star gear eccentricity error only has a larger influence on its corresponding branch. 18…”

“…Iglesias 16 investigated the effect of eccentricity and planet pin positioning errors on the quasi-static load-sharing of a planetary transmission under two different configurations. Mo 17,18 studied the load-sharing characteristics of the face gear power-split system in consideration of the error in gear manufacturing and installation. Nevertheless, for the power-split gearing system with multiple branches, it is complex to acquire the comprehensive effect of multiple-errors on the load-sharing characteristic of the system.…”

Improvement of action recognition based on ANN-BP algorithm for auto driving cars

“…In this process, the study uses stochastic gradient descent to update the model parameters. Also the study provides technical support to the AD automotive field by monitoring the real-time motion video through the deployed model (Song et al, 2022). In this, the parameter optimization process of the ANN-BP model is shown in Figure 3.…”

Machining principle and cutter design of face gear skiving

“…Because of the advantages of high bearing capacity, and low sensitivity to installation error, face gear is used in various fields. [1][2][3][4][5][6][7] Due to the complex structure, the processing methods of face gear are mainly limited to gear shaping, gear hobbing, etc. Many scholars have carried out a lot of research on face gear, especially in processing.…”

“…1,2 Zschippang analyzed the tooth surface generation and contact characteristics of face gear. 3 Mo et al 4–7 systematically studied the gear design theory and the load distribution uniformity mechanism of the gear transmission system. Based on the principle of meshing, Tang and Yang 8 proposed a planning method for machining spur gears with a four-axis CNC planer and used simulation software to verify the feasibility of the method.…”