Nonlinear numerical analysis of a flexible rotor equipped with squeeze couple stress fluid film journal bearings

Abstract

This study performs a dynamic analysis of a rotor supported by two squeeze couple stress fluid film journal bearings with nonlinear suspension. The numerical results show that the stability of the system varies with the non-dimensional speed ratios and the dimensionless parameter l * . It is found that the system is more stable with higher dimensionless parameter l * . Thus it can conclude that the rotor-bearing system lubricated with the couple stress fluid is more stable than that with the conventional Newtonian fluid. The modeling results thus obtained by using the method proposed in this paper can be used to predict the stability of the rotor-bearing system and the undesirable behavior of the rotor and bearing center can be avoided.

Bifuraction Analysis of Hydrodynamic Plain Journal Bearing Lubricated With Couple Stress Fluid

“…In 2006, C. K. Chen et al [18] proposed a non-linear model to study the dynamic behaviour of the rotor centre and bearing centre and explained that the dynamic behaviour of the system includes 2T-periodic, quasi-periodic and chaotic motions. In 2007, C. W. Chang-Jian et al [19] investigated the dynamic analysis of a rotor supported by two couple stress fluid film journal bearings with non-linear suspension. It was concluded that rotor bearing system lubricated with couple stress fluid is more stable than that with the conventional Newtonian fluid.…”

Non-linear dynamic analysis of a HSFD mounted gear-bearing system

“…The occurrence of periodic, quasi-periodic and chaotic motions was predicted for various ranges of rotor speeds. Chang-Jian and Chen [12][13][14][15][16] presented a series of papers discussing about flexible rotor supported by journal bearings under non-linear suspension and also combined with rub-impact effect, turbulent effect and micropolar lubricant into consideration. They found very bountiful non-periodic responses occurring in rotor-bearing systems and the studies would help engineers or scientists escape undesired motions in either designing or operating rotorbearing systems.…”