环形过渡元素及其在轮盘振动分析中的应用

 本文发展了联结环形等参数元素和环形厚板元素的一类环形过渡元素,它对于轴对称体的结构动力分析具有重要意义。环形元素采用了半解析的方法,把三维问题降为二维问题来处理,大大节省了计算机存贮量及计算时间。文中对某实际涡轮盘的振动特性进行了计算,其结果是令人满意的。

AN ANNULAR TRANSITION ELEMENT AND ITS APPLICATION TO DISC VIBRATION ANALYSIS

An annular transition element is proposed, in which circumferential displacements are represented by Fourier, series. Therefore, it reduces three-dimensional problems into two-dimensional ones and saves computer storage, and time considerably.In dynamic analysis of a thick disc, its inner bub is represented by annular isoparametric elements and its web by annular thick plate elements, the annular transition elements are provided to connect the above two kinds of elements. The combined finite element model is applied to calculating the dynamic characteristics of an actual turbine disc. The results obtained are compared favourably with the experimental data and the analytical results by other finite element models （i. e, annular thick plate elements and sector thick plate elements）.