刚架振动的高精度单元

A HIGH-PRECISION ELEMENT FOR FRAME VIBRATION ANALYSIS

摘要: 用常规有限元法求刚架自振频率时,如果每个杆件取作一个单元,则对于无侧移刚架,其误差可达30%以上。本文应用文献[1]的作法,导出刚架振动的一个低自由度、高精度单元,误差可限制在0.2%以下。

Abstract: For frames without side away, the error of natural frequencies obtained from the conventional finite element method may exceed 30% if each member of the frame is taken as a single element. In this paper a high-precision element with four degrees of freedom for frame vibration analysis is proposed. The natural frequencies calculated from the proposed method is very ac curate (error<0.2%) and the total degrees of freedom are the sama as that of the conventional finite elemet method.