关键词: 振动与波, 输电塔, 串联多质点模型, 有限元模型, 动力特性, 试验模态

Abstract:

Transmission towers are vital important part of the state grid. They have the characteristics of high height, large span, and flexibility. The towers are sensitive to wind loads. Establishing a model that can reflect the dynamic characteristics of transmission towers is crucial for wind-induced vibration control. Three kinds of experimental transmission tower models were established separately, including multi-degree-freedom model, finite element model using beam elements and finite element model using beam-rod mixed elements, with the purpose of studying the accuracy of theoretical model. Modal analysis was carried out subsequently. Meanwhile, a hammering test using Single-Input Multi-Output (SIMO) test method was performed on the experimental transmission tower model. The calculation models were compared with the test results. And the results show that the model using beam-rod mixed elements is the most accurate simulation model of the three. It can excellently simulate the dynamic characteristics of transmission towers. This model can be regarded as the optimal model for the transmission tower simulation.