The stability of a gas bearing is treated by a new procedure in which the bearing film is characterised by its responses to step-jump displacements. Duhamel’s theorem is invoked to generalize these step responses in a system of dynamical equations. Stability is determined by calculation of a “growth factor” for each degree of freedom. Results are presented for the infinitely long self-acting sleeve bearing and for a finite length two-bearing system.
A method for obtaining the performance characteristics of a rotor-tilting pad gas lubricated journal bearing system by solving the appropriate dynamics equations together with the time-transient Reynolds’ equation is outlined. Results for a 4 degree of freedom and an 18 degree of freedom system are given. Comparison with steady-state and experimental results are also discussed.
The behavior of the pressure distribution within partial-arc and slider bearings under conditions of high-speed operation is investigated to provide an understanding of the basic phenomenon. Both the trailing-edge conditions and side-leakage effects are treated by asymptotic methods. A design example is given in which the edge effects on load capacity are computed as “corrections” to the infinite speed (Λ → ∞) solution.
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