scholarly journals Dynamic Analysis of Helical Gears With Sliding Friction and Gear Errors

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 60467-60477 ◽  
Author(s):  
Wenchao Mo ◽  
Yinghou Jiao ◽  
Zhaobo Chen
Keyword(s):  
Dynamic Analysis ◽  
Sliding Friction ◽  
Helical Gears

The influence of mesh misalignment on the dynamic characteristics of helical gears including sliding friction

2015 ◽  
Vol 29 (11) ◽  
pp. 4563-4573 ◽  
Author(s):  
Hanjun Jiang ◽  
Yimin Shao ◽  
Chris K. Mechefske ◽  
Xiaohui Chen
Keyword(s):  
Dynamic Characteristics ◽  
Sliding Friction ◽  
Helical Gears

Time-Domain Dynamic Analysis of Helical Gears with Reduced Housing Model

2013 ◽  
Vol 6 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Vijaya Kumar Ambarisha ◽  
Shih-Emn Chen ◽  
Sandeep Vijayakar ◽  
Jeff Mendoza
Keyword(s):  
Dynamic Analysis ◽  
Time Domain ◽  
Helical Gears

Analysis of time-varying friction excitations in helical gears with refined general formulation

2015 ◽  
Vol 229 (13) ◽  
pp. 2467-2483 ◽  
Author(s):  
Hanjun Jiang
Keyword(s):  
Friction Force ◽  
Contact Line ◽  
Sliding Friction ◽  
Helix Angle ◽  
Universal Method ◽  
Time Varying ◽  
Contact Ratio ◽  
Friction Forces ◽  
Helical Gears ◽  
Face Width

Time-varying sliding friction force and friction torque are regarded as non-negligible excitation sources of vibration and noise in gears. The sliding friction force primarily excites the motion along the off-line-of-action direction, which transmits vibration to the housing through shafts and bearings and then radiates noise. Since the contact line intersects with the pitch line, and the directions of the friction forces are opposite on both sides of the pitch line, the calculation of the friction excitations in helical gears becomes more difficult, especially in the high contact ratio helical gears. However, there is no universal method for calculating the friction excitations in helical gears with different range of contact ratio. The changes of friction excitations in helical gears are highly dependent on the geometric parameters such as helix angle and face width among others. Yet, there exist very limited studies on these topics. In this study, a refined general formulation for the calculation of time-varying contact line and friction excitations is proposed by assuming uniform load distribution along the contact lines with time-varying normal force and friction coefficient. Key gear parameters such as modification coefficient, helix angle, and face width are analyzed to illustrate their effects on the time-varying contact line and friction excitations. The results demonstrate that the refined general formulation is effective for the calculation of the friction excitations in helical gears with different range of contact ratio, and the parametric analysis could supply some guidance for choosing gear parameters in the design of helical gears to reduce the friction excitations.

On the Dynamics of Bull-Nose Plane Six-Rod Mechanism Considering some Practical Factor

2010 ◽  
Vol 426-427 ◽  
pp. 65-69 ◽  
Author(s):  
C.M. Li
Keyword(s):  
Dynamic Analysis ◽  
Friction Force ◽  
Sliding Friction ◽  
Periodic Change ◽  
Actual Movement ◽  
Force Direction ◽  
Mechanics Characteristic ◽  
Speed Fluctuation ◽  
Flexible Component ◽  
Computing Simulation

Taking the mechanics characteristic of electromotor, the mass of slide and the sliding friction into account, the resolving calculating formulae for the kinematics and dynamic analysis of bull-nose plane six-rod mechanism is educed based on the dynamics principle. The disposing method of friction force operation direction is proposed. The computing simulation of this mechanism shows that the speed fluctuation would be aggrandized with the friction considered and the periodic change of friction force direction would be presented in the periodic change of acceleration. At last, the adding flexible component for the computing simulation near to actual movement is pointed out.

An approach of calculation on sliding friction power losses in involute helical gears with modification

2015 ◽  
Vol 230 (9) ◽  
pp. 1521-1531 ◽  
Author(s):  
Cheng Wang ◽  
Huan Yong Cui ◽  
Qing Ping Zhang ◽  
Wen Ming Wang
Keyword(s):  
Sliding Friction ◽  
Tooth Surface ◽  
Surface Load ◽  
Power Losses ◽  
Tooth Contact Analysis ◽  
Helical Gears ◽  
Friction Power ◽  
Transmission Errors ◽  
Normal Forces ◽  
Load Distributions

Sliding friction between the teeth is recognized as one of the main reasons of power losses in transmission as well as a potential reason of vibration and noise. A new approach is proposed to accurately calculate the sliding friction power losses in involute helical gears considered modification and geometric deviations resulting from the manufacturing processes, assembly errors, and deflections of support structures based on the simulation of gear mesh under light and significant load. Firstly, the paths of contact points on the pinion tooth surface are obtained from tooth contact analysis. Tooth surface load distributions and loaded transmission errors in one mesh period are obtained from loaded tooth contact analysis. Secondly, tooth surface load distributions are converted into the normal forces of tooth surface points of contact, loaded transmission errors are brought to the calculation formulas of sliding velocity, and the sliding friction coefficients of tooth surface points of contact are calculated by a non-Newtonian thermal elastohydrodynamic lubrication model. Substituting the sliding velocities, the normal forces, and the sliding friction coefficients into the power calculation formulas gives the sliding friction power losses of tooth surface points of contact. By the soft MATLAB, the values of the sliding friction power losses are integrated and the sliding friction power loss in helical gears from engagement to disengagement is obtained. Finally, an example of this approach is shown in the end. The results indicate that it is very necessary to consider the influence of loaded transmission errors for calculation of sliding friction power losses.

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