Comparative study on static and dynamic characteristics of pumping-out and pumping-in herringbone grooved journal bearings

The aim of this paper is to compare the static and dynamic performances two types herringbone grooved journal bearings (HGJBs), that is, pumping-out HGJB pumping-in HGJB. Firstly, based on finite control volume method principle flow balance, an equivalent Reynolds equation considering turbulence effect derived. Then, motion angular displacement analyzed with linear perturbation method. linearized into static-form one perturbed-form ones. These equations are solved by difference their solutions integrated bearing surface determinate characteristics coefficients Additionally, critical mass whirl frequency defined for evaluating stability rigidity solving a four degree freedoms (DOFs). Finally, HGJBS compared symmetrically in consideration effects eccentricity ratio, length diameter groove angle, depth, width sealing damp, tilting journal, rotation speed. results show that, within interested range investigated parameters, superior generally. Stability better than but inferior