Analysis on the Difference of Galloping Characteristics between Two Transmission Line Models with Thin Ice Accretions
Two transmission line models with thin ice accretions are established to investigate the difference of galloping characteristics.The Model 1 describes the coupling effects of in-plane,out-of-plane and torsional motions on galloping.And the Model 2 also contains the coupling effect of longitudinal motions on galloping, in which the longitudinal motion is simplified into the in-plane and out-of-plane directions.Then, the nonlinear equations about internal nonresonance and 2∶1 internal resonance are derived, respectively.By numerical method, the effects of simplified longitudinal motion on the amplitude, frequency and critical wind speed are discussed.In internal nonresonance case, the galloping amplitude in model 2 is larger than that in model 1 and the deviation ratio is more than 29%.On the contrary, the galloping frequency is lower and the deviation ratio is above 10%.Moreover, the upper critical wind speed is same while the lower critical wind speed increases in Model 2, that is, the galloping wind speed range increases.In 2∶1 internal resonance case,the system is in a stable state and the galloping does not happen in Model 1 while the galloping still exists in Model 2.The results indicate that the nonlinear characteristics caused by the simplified longitudinal motion cannot be ignored during the galloping of iced transmission line.
iced transmission line galloping model nonlinear characteristics numerical simulation
Fujiang Cui Xijun Liu Suxia Zhang Anqi Zhou Bing Huo
Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin, P.R.China, 3 College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin, P.R.China,30
国际会议
Eighth Symposium on the Mechanics of Slender Structures(Moss 2019)(第八届国际细长结构力学论坛)
上海
英文
32-34
2019-05-24（万方平台首次上网日期，不代表论文的发表时间）