柔性石墨纸轧机动刚度薄弱部位辨识与优化

Weak Part Identification of Dynamic Stiffness of Flexible Graphite Paper Rolling Machine and Optimization Design

借助谐响应分析辨识出柔性石墨纸轧机动刚度的薄弱环节,并利用灵敏度分析方法建立该环节的优化数学模型,进而实现对整机动刚度的提升。通过对各部件刚度提升前后的柔性石墨纸轧机进行模态分析,并对比各部件对整机固有频率的影响,辨识出薄弱部位为底座,故以底座为优化对象;将牌坊Y向共振频率对底座尺寸的灵敏度曲线拟合得出优化目标函数,以Y向共振频率为优化目标,质量为约束条件建立优化方程并求解;对比优化前后整机的动刚度,得出:在质量不增加的情况下,整机薄弱频率提升了24.1%,Y向振幅降低了15.9%。为提高优化效率提供了理论依据和参考。

In order to improve the dynamic stiffness of flexible graphite paper rolling machine, harmonic response analysis of this machine is calculated to identify the weakness link and sensitivity analysis method is used to build optimization mathematical model. Modal analyses of flexible graphite paper rolling machine before and after stiffness of each part is enhanced are calculated, the base is identified as the weakness part of this machine, the base is the object to be optimized. Optimized objective function is got by date fitting for the sensitivity curve of Y direction frequency of milt housing and dimensions of the base; build and solve the merit function that the optimized goal is Y direction frequency and the constraint is the quality of the whole machine. Compare the dynamic stiffness of the whole machine before and after optimized, then get that： weakness frequeneyincreases by 24.1%, amplitude of displacement resonance in Y direction decreases by 15.9%. These methods provide reference and theoretical basis for increasing design efficiency.