Can I read Nonlinear Dynamic Analysis of a Hybrid Squeeze-film Damper-mounted Rigid Rotor Lubricated with Couple Stress Fluid and Active Control on EtoBox?

Nonlinear Dynamic Analysis of a Hybrid Squeeze-film Damper-mounted Rigid Rotor Lubricated with Couple Stress Fluid and Active Control by Cai-Wan Chang-Jian; Her-Terng Yau; Jiann-Lin Chen is a Engineering article available to read on EtoBox.

What is Nonlinear Dynamic Analysis of a Hybrid Squeeze-film Damper-mounted Rigid Rotor Lubricated with Couple Stress Fluid and Active Control about?

The hybrid squeeze-film damper bearing with active control is proposed in this paper and the lubricating with couple stress fluid is also taken into consideration. The pressure distribution and the dynamics of a rigid rotor supported by such bearing are studied. A PD (proportional-plus-derivative) controller is used to stabilize the rotor-bearing system. Numerical results show that, due to the nonlinear factors of oil film force, the trajectory of the rotor demonstrates a complex dynamics with rotational speed ratio s. Poincaré maps, bifurcation diagrams, and power spectra are used to analyze the behavior of the rotor trajectory in the horizontal and vertical directions under different operating conditions. The maximum Lyapunov exponent and fractal dimension concepts are used to determine if the system is in a state of chaotic motion. Numerical results show that the maximum Lyapunov exponent of this system is positive and the dimension of the rotor trajectory is fractal at the non-dimensional speed ratio s = 3.0, which indicate that the rotor trajectory is chaotic under such operation condition. In order to avoid the nonsynchronous chaotic vibrations, an increased proportional gain

Who reads Nonlinear Dynamic Analysis of a Hybrid Squeeze-film Damper-mounted Rigid Rotor Lubricated with Couple Stress Fluid and Active Control?

Author

Cai-Wan Chang-Jian; Her-Terng Yau; Jiann-Lin Chen

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0307-904X)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)