SMALL TRANSIENT AND PERIODIC SQUEEZE MTIONS IN PARALLEL GAS FILMS,

A perturbation analysis is employed t find pressure in a thin gas film contained between two nearly parallel surfaces. The method is sufficiently general to allow small but otherwise quite arbitrary time-dependent variations in the separation of the surfaces. Thus film forces and moments may be obtained for periodic or non-periodic motions of either rigid or flexible surfaces. No tangential motion is permitted, however. Special cases treated in detail are several different motions of finite rectangular and infinite gas bearings. Time constants for transient effects are estimated. Author