基于ANSYS的塔器自振周期计算

CALCULATION OF NATURAL VIBRATION PERIOD OF TOWERS BASED ON ANSYS

借助有限元软件ANSYS,分别对“NB/T47041标准释义及算例”中的4台塔器(例题1~例题4)进行了模态分析,结果表明:对于截面特性不变或变化较小的塔器(例题1、例题3、例题4),ANSYS数值解与NB/T47041中的解法误差很小;对于截面特性变化较大的塔器(例题2),集中质量法、矩阵迭代法的精度受制于分段数,数值解更为准确。

The modal analysis of four towers (Example 1st to 4th) in "NB/T 47041 standard interpretation and calculation example" is carried out with the finite element software ANSYS. The results show that the error between the numerical solution of ANSYS and the methods in standard NB/T 47041 is very small for the towers with no change or little change in section characteristics (Example 1, 3 and 4). And for the towers with big change in section characte-ristics (Example 2), the accuracy of the lumped mass method and matrix iteration method is subject to the number of sections and the nume-rical solution is more accurate.