Dynamic Analysis of Overhead Transmission Lines under Turbulent Wind Loading

Dua, Alok; Clobes, Mathias; Höbbel, Thomas; Matsagar, Vasant

doi:10.4236/ojce.2015.54036

Cited by 12 publications

(8 citation statements)

References 15 publications

(24 reference statements)

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“…In addition, the time varying properties of the wind field require properties such as the aerodynamic damping to be modified throughout time. Previous studies that conducted dynamic analyses on transmission line systems due to synoptic wind such as Dua et al (2015), Keyhan et al (2013), and McClure and Lapointe (2003) considered an equivalent viscous damping to account for the aerodynamic damping. The values used by FIGURE 2 | Layout of tested conductor system.…”

Section: Numerical Modelmentioning

confidence: 99%

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The Dynamic Effect of Downburst Winds on the Longitudinal Forces Applied to Transmission Towers

Ibrahim

Damatty

Elawady

2019

Front. Built Environ.

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Electric power transmission line systems are a key component in the development of our modern societies. The uninterrupted availability of electric power mandates building transmission line structures that can withstand severe natural hazards. The current study focuses on the performance of conductor line systems subjected to downburst loading, which along with other types of wind events are responsible for 80% of weather related failures of transmission lines. Due to the special configuration of downburst wind fields, a unique failure mode of transmission line structures can be found to damage the cross-arms of the supporting towers as a result of the development of longitudinal forces in the conductor lines. The main concern of the current study is to explore the dynamic effect of downburst loading on these longitudinal forces, and to examine the validity of using quasi-static analysis. This is done through two levels of analysis, model-scale and full-scale. The model-scale analysis is first used to propose a simulation technique that can predict the dynamic response of conductor systems due to downburst loading overcoming the complexity induced by time varying aerodynamic damping coefficients. The proposed model is validated using a unique experiment conducted at WindEEE dome testing facility at The University of Western Ontario in Canada. The validated model is used to conduct analysis at the full-scale level using a wind field generated by a Computational Fluid Dynamics (CFD) model. Results show that the longitudinal forces within the conductor system are dynamically insensitive and can therefore be treated quasi-statically. Lastly, to judge the applicability of the wind field used, a comparison was made between the CFD wind field and full-scale records. The comparison was done through two parameters that would affect the quasi-static response; the first relating the peak velocity to the post peak velocity, and the second defining the ramping period. It was concluded from the comparison that varying the defined parameters would result in a maximum difference of 5% in the computed reactions.

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Section: Numerical Modelmentioning

confidence: 99%

“…The values used by FIGURE 2 | Layout of tested conductor system. Dua et al (2015) and Keyhan et al (2013) were those resulting from the fluid structure interaction model computed by the latter study. These values were then implemented through different commercial software packages to enable 3D finite element analysis.…”

Section: Numerical Modelmentioning

confidence: 99%

The Dynamic Effect of Downburst Winds on the Longitudinal Forces Applied to Transmission Towers

Ibrahim

Damatty

Elawady

2019

Front. Built Environ.

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“…In some criteria there are maximum values from the analyzed course. Maximum values can also be evaluated in a statistical manner, as presented by Davenport [8,9,19]:…”

Section: Max Values From Psdmentioning

confidence: 99%

General Procedure for Formulation of Multiaxial Fatigue Failure Criteria in Frequency Domain

2019

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Fatigue life assessment under multiaxial loading conditions needs the use of multiaxial fatigue failure criteria. There are many formulations of such criteria which are usually divided in the groups of critical plane criteria and invariants based criteria. Other classifications refer to the parameter that determines fatigue, and these are stress, strain and energy criteria. Recently, the development of computational techniques for fatigue analysis in the frequency domain have been noticed. Analyzing the literature, it can be noted that these criteria are mainly created by the new formulation of them in the new domain. There is therefore a need to develop a general approach to the problem of formulating criteria in the frequency domain on the basis of existing proposals for the time domain. The paper presents the manner in which the values appearing in the criteria in the frequency domain can be determined. In particular, the process of formulating criteria of multiaxial random fatigue, using the critical plane approach proposed by Macha was presented. During the formation the linearity of such criteria was successfully used. Situations that indicate the correctness of transformations are also presented.

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“…600 seconds of simulated time Sine wave with 0.05 time step was considered in the analysis. Although 0.01 was the right time step according to Dua et al as in [10], due to constraints of memory usage, a time step of 0.05 seconds was used. The different angles of attack of 0 o , 45 o and 90 o were considered to see the effect of the angles towards the response of the tower on the same wind speed used.…”

Section: Time History Analysismentioning

confidence: 99%

“…It is essential in order to improve the safety and security of power line system and to avoid any possible failure [9]. A 3D non-linear analysis including the large displacements was carried out by Dua et al as in [10] to study the dynamic response of transmission tower-line systems under fluctuating wind loads, caused by conductors. Effects of parameters like coherence along element length and integration time step were considered.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Self-Supported Power Transmission Tower Subjected to Wind Action

Hamzah

Usman²,

Yatim

2018

IJET

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A power transmission tower carries electrical transmission conductor at adequate distance from the ground. It must withstand all nature’s forces besides its self-weight. In structural analysis, natural frequency, mode shape and damping ratio are used to define the structural dynamic properties which relate to the basic structural features. This paper described the dynamic analysis including the modal and the time history analysis on each segment of the self-supported transmission tower to understand its dynamic responses subjected to wind action. The factors such as different height above ground, a different value of wind speed and different wind angle of attack were included in this study to see the influence of those factors towards dynamic response of the structure. The contribution of the wind towards the displacement of the structure is determined in this study by comparing the result obtained in a linear static analysis which considered the load combination without and with the presence of wind action. It was found that displacement using dynamic analysis is bigger than static linear analysis. The result illustrates that the studied factors gave a significant effect on the dynamic response of the structure and the findings indicate that dynamic analysis is vital in structural design.

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Dynamic Analysis of Overhead Transmission Lines under Turbulent Wind Loading

Cited by 12 publications

References 15 publications

The Dynamic Effect of Downburst Winds on the Longitudinal Forces Applied to Transmission Towers

The Dynamic Effect of Downburst Winds on the Longitudinal Forces Applied to Transmission Towers

General Procedure for Formulation of Multiaxial Fatigue Failure Criteria in Frequency Domain

Dynamic Response of Self-Supported Power Transmission Tower Subjected to Wind Action

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