Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Structural Engineering and Mechanics Volume 75, Number 4, August25 2020 , pages 465-475 DOI: https://doi.org/10.12989/sem.2020.75.4.465 |
|
|
|
The nonlinear galloping of iced transmission conductor under uniform and turbulence wind |
||
Zhonghua Liu, Chenhui Ding, Jian Qin and Ying Lei
|
||
| Abstract | ||
| The analytical approach for stability and response of iced conductor under uniform wind or turbulent wind is presented in this study. A nonlinear dynamic model is established to describe the motion of iced conductor galloping. In the case of uniform wind, the stability condition is derived by analyzing the eigenvalue associated with linearized matrix; The first order and second order approximation of galloping amplitude are obtained using multi-scale method. However, real wind has random characteristics essentially. To accurately evaluate the performance of the galloping iced conductor, turbulence wind should be described by random processes. In the case of turbulence wind, the Lyapunov exponent is conducted to judge the stability condition; The probability density of displacement is obtained by using the path integral method to predict galloping amplitude. An example is proposed to verify the effectiveness of the previous methods. It is shown that the fluctuating component of wind has little influence on the stability of iced conductor, but it can increase galloping amplitude. The analytical results on stability and response are also verified by numerical time stepping method. | ||
| Key Words | ||
| iced conductor; turbulence wind; galloping; multi-scale method; path integral method | ||
| Address | ||
| School of Architecture and Civil Engineering, Xiamen University, 422 Siming South Road, Xiamen, China | ||