However flux leakage is really exist, calculation through formular analytic method has more error, so electromagnetic field analysis is made by using finite element method ( fem ) in ansys7.1 / multiphysics and ansys / emag programs . typical quantities of interest in a magnetic analysis are available such as magnetic flux density, magnetic field intensity, magnetic forces, power loss and flux leakage in the system of magnetic levitation . then gain the current in the coil which control levitation gap when the stage is stable 由于存在漏磁,用公式的解析法計算有很大的誤差,因此本文采用有限元法(fem)來計算磁懸浮系統(tǒng)磁場分布,從而計算磁力,通過用ansys7.1軟件進(jìn)行有限元電磁場分析計算,得到平臺穩(wěn)定懸浮時電磁線圈所需電流、懸浮氣隙等控制參數(shù),由于設(shè)計的磁懸浮系統(tǒng)為非軸對稱結(jié)構(gòu),采用2d磁場分析有一定的誤差,而采用3d電磁場分析更接近實際。
Based on g-w contact model, two rough surfaces in contact were simplified to a smooth one and a rough one which has regular rectangular asperities, and a three-dimensional transient thermal and stress coupled fem model was established using thermal-structure sequential coupling . the course of the sliding with friction was simulated using the nonlinear multiphysics field fem, meanwhile considering thermal-elastic problems of the two bodies, to calculate and analyze the temperature, contact pressure and stress of the sliding contact surfaces with frictional heating 基于g-w接觸模型,將兩個粗糙表面簡化為一個有規(guī)則排列的長方體微凸體的粗糙表面與一光滑表面,利用熱結(jié)構(gòu)順序耦合建立三維瞬態(tài)有限元計算模型,考慮兩個物體摩擦接觸的熱彈性問題,采用非線性有限元多物理場來實現(xiàn),對粗糙表面接觸模型的瞬時摩擦溫度場、壓力場和應(yīng)力場進(jìn)行了計算分析。