[[alternative]]Design and characteristic analysis of high speed spindle aerostatic circular double pad thrust bearings

碩士工業教育與技術學系[[abstract]]本篇論文首先對不同直徑具有配流槽形式之氣靜壓止推軸承的性能進行理論分析比較。其中，理論分析利用有限差分法求解流量平衡方程式；而有限元素法求解雷諾方程式，在不同的配流槽形狀將改變方程式之邊界條件，比較其軸承的性能，並對溝槽尺寸對承載能力的影響加以探討。 此外，以實際設計的高速氣靜壓主軸雙向止推軸承，具有八孔環狀形式軸承進行分析與設計。利用流量守恆定律，推導成有限差分法之型態以探討軸承的特性，並且比較傳統以雷諾方程式求解之差異；另外，並探討主軸轉速產生動壓效應、自重、及軸承傾斜時對止推軸承承性能之影響。[[abstract]]The purpose of this paper is to make an investigation on the circular aerostatic thrust bearing with grooves and with different diameters presented by describing numerical methods in which Reynolds’ equation is solved in finite element form and on the other way the resistance network method (R.N.M.) based on the concept of flow continuation is obtained. The theoretical model developed is capable of calculating the pressure distribution in the gas-lubricated film and the load-carrying capacity as a separating force. Beside, to analyze the behavior on double-pad thrust bearing with eight restrictors for the high-speed spindle, and to estimate the pressure distribution in considered thrust bearing, numerical calculations were presented by the R.N.M. based on the concept of flow continuation. The coincidence of results derived from the R.N.M. and the F.D.M. based on the Reynolds’ equation has been proved. Finally, the aerodynamic effect caused by the high rotating speed of the spindle will be taken into account. The characteristic of load capacity is influenced by the spindle weight and the bearing inclination