Nonlinear Dynamic Characteristic Analysis of a Coated Gear Transmission System

Abstract

Coatings can significantly improve the load-carrying performance of a gear surface, but how they affect the vibration characteristic of the system is an urgent issue to be solved. Taking into account the nonlinear factors like the variable mesh stiffness, friction, backlash, and transmission error, a six-degree-of-freedom spur gear transmission system with coatings is presented. Meanwhile, the finite element method is applied to acquire the time-varying mesh stiffness of the coated gear pair in the engagement process. With the support of the time-history curve, phase curve, Poincare map, and fast Fourier transform spectrum, the dynamic characteristics and the effects of the coating elastic modulus on vibration behaviors of a gear transmission system are minutely dissected by using a numerical integration approach. Numerical cases illustrate that the dynamic characteristic of a gear transmission system tends toward a one-period state under the given operating condition. They also indicate that, compared with softer coatings, stiffer ones can properly enhance the transmission performance of the coated gear pair. Numerical results are also compared with previous studies, and can establish a theoretical basis for dynamic design and vibration control of the coated gear transmission system.

Comparative Study on Transmission Performance of Manganese Phosphate Coated Gears

“…On the other hand, the elastic modulus of coated gear is greatly reduced, resulting in the reduction in gear mesh stiffness and damping. According to the conclusion of reference [4], the elastic modulus is reduced, the dynamic meshing force is increased, and the torsional angle vibration acceleration amplitude is reduced in combination with the torsional dynamic equation.…”

“…With the development of new energy vehicles, extra requirements are put forward for the gear transmission systems, such as heavy load, high speed and light weight. The performance of the gear tooth surface has an important influence on the improvement of gear transmission performance [3,4]. The research shows that the tribological properties between gear surfaces can prolong the fatigue life and improve the transmission efficiency of gears.…”

“…The dynamic model of multi degree of freedom (DOF) gear system considering multi factors can effectively reflect the dynamic characteristics of gear. Xiao et al [4] established the dynamic model of 6-DOF coated spur gear, and analyzed the influence of coating on the amplitudes of vibration displacements and velocities of gear transmission system. Wang et al [27] built an 8-DOF spur gear system, and the nonlinear characteristics of the system were characterized by bifurcation diagram, Poincare map and spectrum diagram.…”

Influence of the movement of involute profile gears along the off-line of action on the gear tooth position along the line of action direction

“…Also, if the center distance is changed along LOA, the same displacement is made between the surfaces of the in-volute profile teeth that are in mesh. As far as gear movement along OLOA is concerned, its impact on the meshing tooth surface distance is neglected in most studies [4,6,17,21,24,27]. In this study, the relationship between the varying distance of gears along OLOA and its effect on the distance between the teeth in mesh is established.…”

Wear prediction considering dynamic load for spur gear in mixed elastohydrodynamic lubrication

“…11 The nonlinear dynamic characteristic of spur gear with coating was studied. 12 The tribo-dynamic model of spur gear was proposed by coupling EHL model and dynamic model. 13 Based on the dynamic load, the lubrication performance of involute gear was studied 14 .…”