A computational fluid dynamics investigation of the segmented integral squeeze film damper

Abstract

Rotor vibration attenuation is achieved with damping devices which work on different, often mutually coupled, physical principles. Squeeze film dampers are damping devices that have been widely used in rotordynamic applications. A new concept of a 5-segmented integral squeeze film damper, in which a flexure pivot tilting pad journal bearing is integrated, was investigated. The damper is studied for the eccentric position between the outer and inner ring of the squeeze film land. The ANSYS CFX software was used for solving the pressure and velocity distribution. The development of the complex three-dimensional computational fluid dynamics model of the squeeze film damper, learning more about the effect of the forces in the damper, and the knowledge about the behaviour of the flow are the principal contributions of this article.

Research on Dynamic Characteristic Coefficients of Integral Squeeze Film Damper

“…where "k" is the stiffness coefficient of the ISFD, "n" is the number of loads, "Fi" is the radial load, and "Di" is the displacement of the ISFD under the load "Fi". Substituting the data in Figure 10 into Equation (17), the numerical analysis value of the ISFD stiffness coefficient is calculated to be 1.99 × 10 6 N/m and the experimental value is 2.01 × 10 6 N/m.…”

“…γ" is the journal feed angular velocity. The numerical analysis value of ISFD damping coefficient can be calculated as 2.31 × 10 5 (N•s)/m by substituting the oil film force in Figure 11 into Equation (17). According to the results of the pressure cloud analysis obtained in Section 3.2, the oil film pressure obtained from the analysis is integrated, and the curve of the oil film force with time can be plotted, as shown in Figure 11.…”

“…The numerical analysis value of ISFD damping coefficient can be calculated as 2.31 × 10 5 (N•s)/m by substituting the oil film force in Figure 11 into Equation (17).…”

“…Despite its widespread use, turbulence modeling has inherent structural deficiencies that prevent it from replicating the underlying turbulence process. Due to the simplification of the model, the turbulence model can only represent certain features of turbulence with limited fidelity [15][16][17]. Zhao et al [18] analyzed the damping coefficients of the SFD based on the assumption of a full-film short bearing.…”

Numerical simulation and influence factors analysis for dynamic characteristics of squeeze film damper

“…The results showed that the temperature of the lubricant was observed to rise with increasing whirl speed and eccentricity ratios in SFD. Ferfecki et al [20] studied the pressure and velocity distribution of the segmented integral SFD. Their results showed that the supply pressure and the inertia of the oil had the influence on the pressure distribution and the hydraulic forces in the segmented integral SFD.…”