Dynamic Characteristics Analysis of Spiral Groove Liquid Lubricated Seal Considering Centrifugal Inertia

A three degree of freedom model of spiral groove liquid lubricated seal was established for studying the effects of centrifugal inertia on dynamic characteristics. The dynamic stiffness and damping coefficients of liquid lubricated seal with centrifugal inertia and those without centrifugal inertia were obtained by means of finite element method, and then comparative analysis was carried out. Results indicate that dynamic stiffness and damping coefficients are increased linearly with the increase of rotating speed. Dynamic stiffness and damping coefficients decrease with the increasing film thickness. The effects of centrifugal inertia on axial stiffness coefficient and angular coupling stiffness coefficient can be neglected under different rotating speed and different film thickness. When the values of rotating speed and film thickness are large, the effect of centrifugal inertia on angle stiffness coefficient cannot be ignored. Centrifugal inertia has no effects on dynamic damping coefficients with the variation of rotating speed and film thickness. (paper)