Study on the nonlinear transient response for the non-contact mechanical face seal

• Main Authors: Yao Chen, Guoyuan Zhang, Weigang Zhao, Feng Ji
• Format: Article
• Language: English
• Published: JVE International 2017-03-01
• Series: Journal of Vibroengineering
• Subjects: mechanical seal; transient; non-linear vibration; response
• Online Access: https://www.jvejournals.com/article/16906
• ISSN: 1392-8716; 2538-8460

Considering the tilt of the seal ring, the transient vibration response analysis model of the non-contact mechanical seal is presented. The model is consisted of the transient Reynolds equation, the equation of motion and the equation for solving the high order nonlinear dynamic coefficients of seal. The relative error of the high order nonlinear film force to the linear film force is also obtained. With Euler method, the characteristic parameters of the transient vibration response are obtained, which include the axial vibration displacements and the angle-swing of the static ring. The 14 nonlinear force and 14 nonlinear overturning moment dynamic coefficients for the non-contact mechanical seal are calculated. The results show that the influence of the damping effects of the sealed fluid between the seal gap on the axial vibration displacements and the angle-swing is linear. The film thickness distribution changes with the axial vibration of seal, which will lead to static ring swing, and the swing also can cause the axial vibration of the seal. With the increase of the nonlinear order, the relative error of the nonlinear film force decreases. All of the nonlinear film forces, the non-linear stiffness coefficient and damping coefficient decrease with the seal film thickness increases.