It has been shown that half-frequency whirl is influenced by orifice location, number of grooves, groove location, and so on. This paper presents test results which show the effect of geometry on the threshold of half-frequency whirl. The following bearing configurations were tested: (a) Plain journal bearings with one orifice centrally located; (b) grooved journal bearings with two axial grooves; (c) grooved journal bearings with three axial grooves; (d) grooved journal bearings with three axial grooves and six orifices. In addition, load-carrying capacity and attitude angle for the plain cylindrical and the two and three axial-groove bearings with two groove positions are given.

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