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Hydrostatic journal bearings possess superior motion accuracy owing to their error averaging effect and often work under different speeds and external loads in precision applications. This paper researches the error averaging effect of hydrostatic journal bearings considering the influences of shaft rotating speeds and external loads. A new mathematical model is established based on a time division method where the rotational movement of the shaft is divided into many time intervals. The averaging coefficients of hydrostatic journal bearings are analyzed in detail. The results show that the averaging coefficients are affected by the combined effects of rotational speeds, and external loads and wave number of roundness errors. Finally, some useful guidelines are given for the accuracy design of hydrostatic journal bearings.

Error Averaging Effect of Hydrostatic Journal Bearings Considering the Influences of Shaft Rotating Speed and External Load