scholarly journals On thermal calculation for helical gear transmission system

2020 ◽  
Vol 724 ◽  
pp. 012007
Author(s):  
I S Gabroveanu ◽  
S Cananau ◽  
R F Mirica ◽  
A A Ilies
Keyword(s):  
Helical Gear ◽  
Transmission System ◽  
Gear Transmission ◽  
Thermal Calculation ◽  
Gear Transmission System

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.

Dynamic Analysis on the Bend-Torsion-Shaft-Pendulum Coupling Vibration Model of Helical Gear

2016 ◽  
Vol 851 ◽  
pp. 273-278
Author(s):  
Bao Sen Yan ◽  
Rui Yang Li ◽  
Chao Hong Liu
Keyword(s):  
Nonlinear Dynamic ◽  
Piecewise Linear ◽  
Helical Gear ◽  
Transmission System ◽  
Gear Transmission ◽  
Production Operation ◽  
Coupling Vibration ◽  
Nonlinear Dynamic Equations ◽  
Gear Transmission System ◽  
Meshing Characteristics

Based on the condition of comprehensively considering the nonlinear factors, such as backlash helical gear transmission, time-varying meshing stiffness and composition error, a coupled nonlinear dynamics model of the multi-DOF bending - torsion - axis - pendulum helical gear is built in this paper, and on the basis of the "piecewise linear" backlash function, getting backlash function that is fitting for helical gear transmission system meshing characteristics through high order fitting. The Runge-Kutta method of the variable step is used to solve the nonlinear dynamic equations of the helical gear transmission system which is deduced and non-dimensional, and the result of the nonlinear dynamic response of the helical gear transmission system is obtained. After comparison, the response results are consistent with the actual situation, which can provide reference for the production operation, etc in the actual conditions, there is practical guiding significance.

Rotordynamics analysis of a double-helical gear transmission system

Meccanica ◽  
2015 ◽  
Vol 51 (1) ◽  
pp. 251-268 ◽  
Author(s):  
Siyu Chen ◽  
Jinyuan Tang ◽  
Yuanping Li ◽  
Zehua Hu
Keyword(s):  
Helical Gear ◽  
Transmission System ◽  
Gear Transmission ◽  
Gear Transmission System

The Vibration Model Establishment and Solution of Bending-Torsion-Axial-Swing Coupled the Helical Gear Transmission System Based on Lumped Parameter Approximation Method

2014 ◽  
Vol 1061-1062 ◽  
pp. 743-747
Author(s):  
Chang Li ◽  
Bing Chen Wang ◽  
Jun Feng Li
Keyword(s):  
Helical Gear ◽  
Transmission System ◽  
Gear Transmission ◽  
Impact Excitation ◽  
Tooth Surface ◽  
Lumped Mass ◽  
Lumped Parameter ◽  
Vibration Model ◽  
Gear Transmission System ◽  
The Time Domain

Based on comprehensive considerations the influences of stiffness excitation, deviation excitation, meshing impact excitation, friction of tooth surface, and other kinds of nonlinear factors, it established a nonlinear coupled vibration model of bending-torsion-axial-swing coupled helical gear transmission system by applying the Lumped Mass Method. After transformed the model to dimensionless form, it used Runge-Kutta method to solve the nonlinear vibration model of the system, and then the time domain chart, spectrum chart, phase chart, Poincare chart, and FFT chart were obtained; it discussed the influence of system parameters on its dynamic characteristics.

scholarly journals Dynamic characteristics analysis of planetary gear system with internal and external excitation under turbulent wind load

2021 ◽  
Vol 104 (3) ◽  
pp. 003685042110356
Author(s):  
Hexu Yang ◽  
Xiaopeng Li ◽  
Jinchi Xu ◽  
Zemin Yang ◽  
Renzhen Chen
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Nonlinear Dynamic ◽  
Planetary Gear ◽  
Wind Load ◽  
Transmission System ◽  
Gear Transmission ◽  
Stiffness Ratio ◽  
Gear Transmission System ◽  
Planetary Gear System

According to the working characteristics of a 1.5 MW wind turbine planetary gear system under complex and random wind load, a two-parameter Weibull distribution model is used to describe the distribution of random wind speed, and the time-varying load caused by random wind speed is obtained. The nonlinear dynamic model of planetary gear transmission system is established by using the lumped parameter method, and the relative relations among various components are derived by using Lagrange method. Then, the relative relationship between the components is solved by Runge Kutta method. Considering the influence of random load and stiffness ratio on the planetary gear transmission system, the nonlinear dynamic response of cyclic load and random wind load on the transmission system is analyzed. The analysis results show that the variation of the stiffness ratio makes the planetary gear have abundant nonlinear dynamics behavior and the planetary gear can get rid of chaos and enter into stable periodic motion by changing the stiffness ratio properly on the premise of ensuring transmission efficiency. For the variable pitch wind turbine, the random change of external load increases the instability of the system.

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