Dynamic analysis of a hydrodynamic seal with helical grooves

A ring-type hydrodynamic seal with two lands, one with helical grooves and the other with a wedge, separated by a circumferential oil supply groove was studied. The dynamic performance characteristics in terms of the stiffness and damping coefficients, critical mass and critical inertia were obtained for lateral and skew motions. For the general motion of the seal, stability studies were made by obtaining the roots of the characteristic equation