多环过盈配合复合材料飞轮应力和位移分析

Analysis of the stresses and displacements for a composites interference fit multi-rim flywheel

储能飞轮由轮毂和多环复合材料轮缘组成,飞轮旋转时轮毂和轮缘既受到离心力作用,同时又受到内外界面压力的作用,且不同转速下界面压力不断变化,使得分析计算由静止到最大工作转速的不同工况,以及飞轮上不同径向位置的应力非常复杂。本工作在平面应力下分别推导了各向异性材料轮缘在离心力作用下和受内外压力作用下的应力和位移解析式,进而采用叠加原理可计算飞轮在不同转速工况、径向不同位置的应力和位移,简化了应力和位移求解过程,可用于飞轮环间过盈量的确定、强度校核和极限转速计算等设计与分析。应用这种方法对一个实际飞轮进行了分析,并绘制了应力和位移曲线。

A flywheel stores energy was composed of hub and multi-rims made of filament winding with carbon fiber. The hub and rims were subject to axisymmetric centrifugal forces due to rotation and pressure come from the interface of rims. The interface pressure varying with the rotation speed made the stress analysis being very complexity at various radius and condition from stop to the maximal operation speed. In this investigation, based on the assumption of a plane stress, an analytic method for calculating the stresses and displacements distribution of the orthotropic rim is presented respectively. Moreover, the superposition principle was applied to calculate the stresses and displacements. The relatively simple solving process was applied to analyze and design the flywheel, such as choosing the interference fit, evaluating strength of the flywheel, and calculating the maximal speed. The analysis result of the stresses and displacements was carried out for an actual flywheel design example.