scholarly journals Investigation of Load Sharing and Dynamic Load Characteristics of a Split Torque Transmission System with Double-Helical Gear Modification

2021 ◽  
Vol 2021 ◽  
pp. 1-22
Author(s):  
Xuan Liu ◽  
Zongde Fang ◽  
Haitao Jia ◽  
Ning Zhao ◽  
Yunbo Shen ◽  
...  
Keyword(s):  
Dynamic Load ◽  
Load Sharing ◽  
Helical Gear ◽  
Transmission System ◽  
Time Varying ◽  
Tooth Contact Analysis ◽  
Meshing Stiffness ◽  
Torque Transmission ◽  
Load Characteristics ◽  
Split Torque

A new dynamic model for a two-input two-path split torque transmission system which considers meshing error, time-varying meshing stiffness, and meshing-in impact is proposed. Time-varying meshing stiffness and meshing-in impact of each gear pair are accurately calculated based on tooth contact analysis and loaded tooth contact analysis. Equivalent displacements of eccentricity error and installation error along the meshing line of second- and third-stages gears are derived. The modified tooth surface of a third-stage double-helical gear is obtained by optimizing the amplitude of static loaded transmission error and meshing-in impact via nondominated sorting genetic algorithm-II (NSGA-II). Influence of modification on load sharing and dynamic load characteristics of split torque transmission system is investigated. The results indicate that the system’s dynamic meshing force increases when meshing-in impact is accounted for, which is unfavorable for the transmission. Following the modification of a double-helical gear, the dynamic load characteristics of the split torque transmission system are significantly improved, while its load sharing characteristics are improved to a certain extent.

scholarly journals Study on the load-sharing characteristics of face-gear four-branching split-torque transmission system

2021 ◽  
Vol 13 (4) ◽  
pp. 168781402110099
Author(s):  
Dong Hao ◽  
Zhang Hao-qin ◽  
Zhao Xiao-long ◽  
Duan Ling-ling
Keyword(s):  
Load Sharing ◽  
Transmission System ◽  
Torsional Angle ◽  
Analysis Model ◽  
Radial Limit ◽  
Face Gear ◽  
Tooth Contact Analysis ◽  
Torque Transmission ◽  
Manufacturing Errors ◽  
Split Torque

In order to solve the load-sharing characteristics of face-gear four-branching split-torque transmission system (FGFBSTTS), the static load-sharing mechanical analysis model was established. In the model, the deformation coordination conditions of torsional angle and torque balance condition were considered. By using Loaded Tooth Contact Analysis (LTCA) technology of face gear and herringbone gear, the time-varying meshing stiffness was calculated. The influences of manufacturing errors, installation errors, I-stage pinion floating, II-stage pinion spline clearance floating, and radial limit ring clearance floating on the load-sharing characteristics are analyzed. The results show that the LTCA technology is more accurate to reflect the load-sharing characteristics of each meshing position. When the I-stage pinion and the II-stage pinion floated at the same time, the best load-sharing characteristics can be obtained. The load-sharing characteristics affected by manufacturing errors showed obvious periodic change. The radial limit ring plays a better auxiliary role in load-sharing characteristics. The theoretical results were compared with the experiments to verify the correctness of the theoretical analysis. The research results can provide a theoretical basis for the optimal design of the load-sharing structure, error control, and assembly of the face gear four branch transmission system.

scholarly journals Study on dynamic load-sharing characteristics of face gear dual-power split transmission system with backlash, support and spline clearance

2021 ◽  
Vol 12 (1) ◽  
pp. 573-587
Author(s):  
Hao Dong ◽  
Hao Qin Zhang ◽  
Xiao Long Zhao ◽  
Ling Ling Duan
Keyword(s):  
Dynamic Load ◽  
Load Sharing ◽  
Transmission System ◽  
Torsional Stiffness ◽  
Time Varying ◽  
Face Gear ◽  
Two Stage ◽  
Meshing Stiffness ◽  
Power Split ◽  
Dynamic Load Sharing

Abstract. The dynamic load-sharing characteristics of aircraft face gear dual-power split transmission system (FGDPSTS) are taken as the research object. Considering the factors of time-varying meshing stiffness, comprehensive error, backlash, support clearance, spline clearance, torsional stiffness, and support stiffness, the dynamic load-sharing model was constructed based on the lumped-parameter method. The loaded tooth contact analysis (LTCA) simulation method was used to calculate the time-varying meshing stiffness. The dynamic load-sharing coefficient (DLSC) is obtained by using Runge–Kutta method. The influences of errors, backlash, support clearance, spline clearance, torsional stiffness and support stiffness on DLSC were analyzed, and the biggest factors affecting dynamic load-sharing performance were found out. The results show that the influence of the backlash of the two-stage herringbone gear pair on the DLSC is more sensitive. The influence of support clearance on the DLSC is less. The load-sharing coefficient increases with the increase of the installation error and eccentricity error, and the influence of the error of the two-stage gears on the system load-sharing performance is the most sensitive. The torsional stiffness has little effect on the load-sharing coefficient of one stage but has great effect on the two-stage load-sharing coefficient. The influence of support stiffness on the DLSC of two-stage is stronger. It provided a theoretical basis for the dynamic stability optimization design of the system.

scholarly journals Floating Shaft Load Sharing Method for Face Gear Split Torque Transmission System

2013 ◽  
Vol 5 (12) ◽  
pp. 3386-3392 ◽  
Author(s):  
Ruifeng Wang ◽  
Ning Zhao ◽  
Li Tao ◽  
Qingjian Jia ◽  
Hui Guo
Keyword(s):  
Load Sharing ◽  
Transmission System ◽  
Face Gear ◽  
Torque Transmission ◽  
Split Torque

Nonlinear Dynamic Analysis of Helical Gear Considering Meshing Impact

2012 ◽  
Vol 201-202 ◽  
pp. 135-138 ◽  
Author(s):  
Feng Wang ◽  
Zong De Fang ◽  
Sheng Jin Li
Keyword(s):  
Dynamic System ◽  
Nonlinear Dynamic ◽  
Helical Gear ◽  
Transmission System ◽  
Contact Analysis ◽  
Gear Transmission ◽  
Impact Excitation ◽  
Tooth Contact Analysis ◽  
Meshing Stiffness ◽  
Gear Transmission System

Comprehensive meshing stiffness and single tooth meshing stiffness are calculated by tooth contact analysis and load tooth contact analysis program. The corner meshing impact model is proposed. Nonlinear dynamic model of helical gear transmission system is established in this paper considering time-varying meshing stiffness excitation, transmission error excitation, corner meshing impact excitation, and the backlash excitation. Take the ship’s helical gear transmission system as an example, the mesh impact force is derived and the primary factors that produce noises are discussed. The effects which the mesh impact brings to vibration characteristics of the gear dynamic system are concluded. Meshing impact has an inevitable effect on the vibration of the dynamic system. Impact excitation costs 8.5% in maximum of vibration acceleration response, 31% in maximum of instantaneous acceleration, and 4.9% in maximum of spectral component amplitude.

Load Sharing of Parallel Shaft Split Torque Transmission System

2012 ◽  
Vol 490-495 ◽  
pp. 2231-2235 ◽  
Author(s):  
Ning Zhao ◽  
Rui Feng Wang ◽  
Li Tao ◽  
Qing Jian Jia
Keyword(s):  
Equations Of Motion ◽  
Load Sharing ◽  
Transmission System ◽  
Variable Step Size ◽  
Step Size ◽  
Runge Kutta Method ◽  
Torque Transmission ◽  
Torque Load ◽  
Fifth Order ◽  
Split Torque

Parallel shaft split torque Transmission system Split torque Load sharing Abstract: The Newton method was applied to develop a system of equations of motion, the mathematical model includes stiffness of shaft supporting, position of gears, backlashes, time-varying stiffness, composite transmission errors, damping. The model was solved by variable step size forth/fifth-order Runge-Kutta method. The load sharing was affected obviously by asymmetry of gear backlashes, stiffness of shaft supporting and gear position

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