Nonlinear dynamic analysis of gear-rotor-bearing system equipped with HSFD under hydraulic actuator active control

Abstract

In this study, the nonlinear dynamic analysis of the hybrid squeeze film damper mounted on a gear-rotor-bearing system is presented. The strong nonlinear oil film force, nonlinear rub-impact force between the rotor and stator, and the gear meshing force are considered in this study. The bifurcation diagrams are plotted using a dimensionless imbalance factor, damping coefficient, and speed ratio as control parameters in this study. The beginning of chaotic motion is identified by phase diagrams, power spectrum, Poincaré maps, bifurcation diagrams, maximum Lyapunov exponent, and the fractal dimension of the system. The numerical results provide useful insights into the design and development of a gear-rotorbearing system for rotating machinery that operates at high speeds and highly nonlinear conditions. Hybrid squeeze film damper is used to suppress irregular dynamic behaviors and reduce greater amplitude, even if the rotational speed of the rotating machine is higher, which is also confirmed in this study. IntroductionGears play an important role in the transmission system, especially for rotor bearing systems and turbomachinery, therefore, the consideration of gears transmission in rotor-bearing systems is needed. The rub-impact effect is a common and important phenomenon that occurs between the rotor and the stator. These effects may cause the rotating system to become instable. The dynamic analysis of the gear-rotor-bearing system with rub-impact effect is therefore important for analyzing rotating machinery. In order to control the dynamic stability of the gearrotor-bearing system with the shock effect, we take the hybrid squeeze film damper (HSFD) to control this kind of system. The HSFD is actually a useful tool, and has been well developed and used in many fields. A squeeze-film damper bearing is actually a special type of journal bearing with its journal mechanically prevented from rotating, but it is free to vibrate within the clearance space. The squeezing action produces hydrodynamic forces in the fluid film. A squeeze-film damper bearing can be designed such that the journal can statically find its own position within the clearance, or be held centrally within the clearance, by retaining the springs. If the retaining springs are

Dynamic responses and control of geared transmission system based on multibody modeling methodology

“…Based on the application of hybrid squeeze film damper in mechanical system, Chang- Jian (2015) researched the active chaos control of a damping controller mounted on geared system. Jian et al (2019) confirmed that the active hybrid squeeze film damper could suppress the chaotic behaviors and reduce vibratory magnitude in a gear-rotor-bearing system.…”

Research on Dynamic Characteristic Coefficients of Integral Squeeze Film Damper

“…SFD generates damping effects through the compression of the inner and outer rings. However, the traditional type of SFD has nonlinear coefficient of dynamic characteristics [3,4]. Wang et al [5] developed a set-mass dynamic model of aero-engine high pressure rotor system and introduced the nonlinear stiffness and damping equations of the SFD into the above model.…”