Influence of Manufacturing Errors on Static and Dynamic Performances of Aerostatic Spindle
An aerostatic spindle is studied in which the its orifices are distributed unevenly and have different diameters and to improve its static and dynamic characteristics.The effects of different orifice diameters and uneven distributions on bearing load capacity are analysed with Finite Difference Method combined with Linear Perturbation Method.The influences of circumferential or axial manufacturing errors(sine waviness,square waviness,triangular waviness)in sleeve on static and dynamic performances are analysed.The results indicate that the bearing capacity of aerostatic spindle increased most significantly if orifice diameter coefficient is within 0.9~0.95.Circumferential and axial manufacturing errors improve bearing capacity.Square waviness and triangular waviness have more significant influence on bearing capacity.Axial square waviness and triangular waviness are hopeful for dissipating the whirling energy and improving the stability of the spindle.The larger the amplitude of manufacturing errors is,the worse the stability of the spindle is.