scholarly journals Random Wind-induced Response Analysis of Transmission Tower-line System

2012 ◽  
Vol 16 ◽  
pp. 1813-1821 ◽  
Author(s):  
Qin Li ◽  
Yuan Junjian ◽  
Li Wei
Keyword(s):  
Induced Response ◽  
Response Analysis ◽  
Transmission Tower ◽  
Line System

Dynamic Energy of a Large Scale Transmission Tower Subjected to Wind Excitations

2011 ◽  
Vol 383-390 ◽  
pp. 3645-3651
Author(s):  
Bo Li ◽  
Bo Chen ◽  
Chun Xia
Keyword(s):  
Large Scale ◽  
Dynamic Performance ◽  
Evaluation Criteria ◽  
Response Analysis ◽  
Transmission Tower ◽  
Structural Dynamic ◽  
Line System ◽  
Energy Characteristics ◽  
Energy Evaluation ◽  
Wind Response

Evaluation on energy characteristics of a wind-excited transmission tower-line system is actively carried out in this study. The analytical method of a transmission tower-line system is established. The evaluation criteria of energy responses is developed and applied to the wind response analysis of a transmission tower. A real transmission tower-line system constructed in China is taken as an example to examine the feasibility and reliability of the proposed approach. The observations from numerical investigation indicate that the proposed energy evaluation criteria can be effectively utilized in the examination on structural dynamic performance.

Analytical Study on Wind-Induced Vibration and its Control of Transmission Towers in Mountainous Area

2011 ◽  
Vol 105-107 ◽  
pp. 635-639
Author(s):  
Zheng Yi Sheng ◽  
Chun Xia ◽  
Wei Ping Xu ◽  
Peng Yun Li
Keyword(s):  
Induced Response ◽  
Mountainous Area ◽  
Superposition Method ◽  
Transmission Tower ◽  
Control Effect ◽  
Line System ◽  
Viscoelastic Dampers ◽  
Transmission Towers ◽  
Out Of Plane ◽  
Wind Induced Vibration

A method for analyzing wind-induced vibration and its control of transmission tower-line system in mountainous area is described. The method is applied to a real transmission line containing two self-supporting steel angle towers, 3 spans of conductors and ground lines together with insulators. Analyses are conducted for the out-of-plane wind direction, and the fluctuating wind load on tower-line system is simulated by harmony superposition method and davenport spectrum. The numerical results indicate that the wind-induced response and its control effect are mainly related to the stiffness of the towers, rather than the mounting height or the spans of the power lines. At the same time, viscoelastic dampers fixed on the main members can suppress the wind-induced displacement of the towers effectively.

Study on Broken Wire Impact and Safety Degree Evaluation

2013 ◽  
Vol 275-277 ◽  
pp. 229-237 ◽  
Author(s):  
Lin Hui Yang ◽  
Rong Xiao ◽  
Xian Wu Ji ◽  
Hong Nan Li ◽  
Tong Sun
Keyword(s):  
Impact Load ◽  
Three Dimensional ◽  
Internal Force ◽  
Response Analysis ◽  
Transmission Tower ◽  
Analysis Model ◽  
Coupling Vibration ◽  
Line System ◽  
Significant Difference ◽  
Three Dimensional Finite Element

Considering transmission tower-line system coupling vibration ,construct a three dimensional finite element nonlinear analysis model for 500KV Shanghai to Xuzhou transmission line project.Execute Dynamic response analysis of transmission tower-line system under broken wire impact with SAP2000.The results show that :broken wire influence on the reaction of transmission tower-line system displacement and internal force can not be ignored ;influence on the reaction of transmission tower-line system displacement and internal force caused by ground wire broken is less while that of conductor is significant,peak value of a stem internal force can be as much as 2 times initial axial force ;the more wires are broken,the vibration response of transmission tower-line system is greater, the safety degree is lower;when it comes to internal force,there is significant difference between consider broken wire load as impact load and as static load,dynamic effects cannot be ignored.

CONTROL OF WIND-INDUCED RESPONSE OF TRANSMISSION TOWER-LINE SYSTEM BY USING MAGNETORHEOLOGICAL DAMPERS

2009 ◽  
Vol 09 (04) ◽  
pp. 661-685 ◽  
Author(s):  
BO CHEN ◽  
JIN ZHENG ◽  
WEILIAN QU
Keyword(s):  
Active Control ◽  
Passive Control ◽  
Control Strategies ◽  
Wind Loading ◽  
Induced Response ◽  
Strong Wind ◽  
Transmission Tower ◽  
Line System ◽  
Control Approach ◽  
Mr Dampers

Transmission tower-line system is a high-rise structure with low damping and it is therefore prone to strong wind excitation. In this paper, the control of wind-induced response of transmission tower-line system is carried out by using magnetorheological (MR) dampers. The effects of brace stiffness of damper are introduced and a multi-degree-of-freedom (MDOF) model is developed for both in-plane/out-of-plane vibration of transmission tower-line system. Two semi-active control strategies are proposed for the vibration mitigation of tower-line system. The first one is based on fixed increment of controllable damper force whereas the second one is a clipped-optimal strategy based on fuzzy control principle. The optimal parameters of the MDOF model of transmission line are investigated. A real transmission tower-line system constructed in China is taken as an example to examine the feasibility and reliability of the proposed approach. A parametric study is conducted for the effects of brace stiffness of MR damper, wind loading intensity, and parameters of MR fluids on the control performance. The results demonstrate that the incorporation of MR dampers into the transmission tower-line system can substantially suppress the wind-induced responses of transmission tower if the damper parameters are optimally determined. The performance of the two kinds of semi-active control approaches is better than that of a passive control approach.

scholarly journals Wind-induced Vibration Optimal Control for Long Span Transmission Tower-line System

2013 ◽  
Vol 7 (1) ◽  
pp. 159-163 ◽  
Author(s):  
Li Tian ◽  
Qian Wang ◽  
Qiqi Yu ◽  
Nuwen Xu
Keyword(s):  
Equations Of Motion ◽  
Three Dimensional ◽  
Time History ◽  
Tuned Mass Damper ◽  
Induced Response ◽  
Transmission Tower ◽  
Line System ◽  
Long Span ◽  
Mass Damper ◽  
Three Dimensional Finite Element

In this paper, tuned mass dampers with optimal parameters for long span transmission tower-line system are investigated. Equations of motion for a structure-TMD system are derived, and the parameters of TMD, stiffness and damping are optimized, respectively. According to a real project, three-dimensional finite element models of both transmission tower and transmission tower-line system are created and their vibration performances are analyzed using SAP2000 software, respectively. Wind load time history is simulated based on wind theory. Using numerical simulation, vibration control with optimal tuned mass damper installed in transmission tower-line system is carried out. Time history curves and the maximum responses of system without and with tuned mass damper under wind excitation are analyzed and discussed. The results show that the optimal tuned mass damper could effectively decrease the wind-induced response of long span transmission tower-line system.

Wind-Induced Response of UHV Guyed Single-Mast Transmission Tower-Line System

2014 ◽  
Vol 501-504 ◽  
pp. 533-537 ◽  
Author(s):  
Wen Gang Yang ◽  
Bo Wen Zhu ◽  
Zhang Qi Wang
Keyword(s):  
Time History ◽  
Element Model ◽  
Wind Loads ◽  
Induced Response ◽  
Transmission Tower ◽  
Typical Structure ◽  
Line System ◽  
Mean Values ◽  
Axial Forces ◽  
Fluctuating Wind

Ultra-high voltage guyed tower is typical structure of tall and slender, with the character of nonlinear and more sensitive to wind loads. Wind load is one of the most important control loads during design phase. A single-mast guyed tower recommended by a UHV DC transmission line was set as an example in this paper. The finite-element model of transmission tower-line system was built, based on Davenport, fluctuating wind velocity time-history was simulated, the result of wind-induced response was analyzed. The result indicates that, as for displacements of the nodes on guyed tower, the mean values of wind-induced response are greater than the displacements under the static equivalent wind loads. As for axial forces of the leg members on guyed tower, the axial forces under the static equivalent wind loads are less than the max values of wind-induced response.

Evaluation on Dynamic Responses of Transmission Lines Subjected to Wind Excitations

2015 ◽  
Vol 744-746 ◽  
pp. 82-87
Author(s):  
Peng Yun Li ◽  
Bo Chen ◽  
Wen Ping Xie ◽  
Hao Liu
Keyword(s):  
Transmission Lines ◽  
Structural Model ◽  
Dynamic Responses ◽  
Induced Response ◽  
Transmission Tower ◽  
Line System ◽  
Long Span ◽  
Commercial Package ◽  
Element Approach ◽  
Strong Winds

The evaluation on dynamic responses of transmission lines subjected to wind excitations is actively carried out in this study. A transmission tower-line system constructed in the southern coastal areas of China is taken as example to examine the wind induced response of the transmission lines. The structural model is established based on finite element approach by using commercial package. The displacement, velocity and acceleration responses of the transmission lines are computed to explore structural performance. The made observations indicate that the transmission lines vibrant substantially when subjected to strong winds. It is obvious that the dynamic responses of the ground wire are smaller than those of the wire and the responses in the long span are much larger than those in the short span.

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