Modal and harmonic response analysis of substation lightning rod

CHEN Yang, CHEN Guoda, JI Shiming, YANG Huafeng

(Key Laboratory of E&M, Ministry of Education & Zhejiang Province, Zhejiang University of
Technology, Hangzhou 310032, China)

Abstract: Aiming at the problems of timeconsuming, labor loss and difficult structural damage detection in the manual inspection and maintenance process, the dynamics characteristics of SLR was studied. The entity model of SLR was established by Solidworks, and the modal and harmonic response analysis of SLR was carried out based on ANSYS Workbench. By the modal analysis, the first ten natural frequencies and the corresponding mode shapes were obtained, which can be used to understand the dynamic performance of lightning rod and preliminarily determine the weak parts of the lightning rod, and provide the frequency range for the harmonic response analysis. Through the harmonic response analysis, the displacement frequency response curve was gained, and the frequencies that most easily cause the resonance were found. The results indicate that the first and second modes have the greatest influence on the dynamic performance of the lightning rod, and the seventh and sixth sections are the most stress concentrated parts. Besides, the flange connection structure is the weak part. This study is meaningful to improve the reliability of the lightning rods and lays a foundation for proposing the dynamic characteristics analysis based damage detection method of the lightning rods.

Key words: ANSYS Workbench; substation lighting rod; modal analysis; harmonic response analysis