Nonlinear Wind-Induced Response Analysis of Substation Down-Conductor System

2021 ◽  
pp. 35-43
Author(s):  
Guoqing Yu ◽  
Zhitao Yan ◽  
Xinpeng Liu
Keyword(s):  
Induced Response ◽  
Response Analysis

Vibration behavior of an overhead conductor under updraft winds

2021 ◽  
pp. 107754632110058
Author(s):  
Qi Zhou ◽  
Liangtao Zhao ◽  
Chong Zheng ◽  
Feng Tu
Keyword(s):  
Induced Response ◽  
Response Analysis ◽  
Response Factor ◽  
Structural Dynamic ◽  
Resonance Response ◽  
Structural Dynamic Characteristics ◽  
Strong Winds ◽  
American Society ◽  
Gust Response Factor ◽  
Gust Response

At present, the wind-induced response analysis of an overhead conductor is mainly based on the action of horizontal normal wind. However, for crossing hillsides or extremely strong winds, such a conductor will bear the action of updraft wind, which will change the geometry of the conductor and make its structural dynamic characteristics nonlinear to some extent. In this work, the in-plane and out-of-plane two-dimensional nonlinear equations were established under the action of self-weight and updraft wind. Furthermore, the improved equations of conductor tension and sag were obtained, and the wind-induced vibration response was further investigated. The results showed that the updraft wind caused the nonlinearity of the tension and sag of the overhead conductor, and the nonlinear geometric change significantly affected its resonance response, which exceeded 25% if the wind speed was 50 m/s. In addition, because the proportion of the resonance response in the total wind-induced response was different, the influence of the wind attack angle calculated using the gust response factor method on the gust response factor was slightly larger than that calculated using the the American society of civil engineers method.

Wind-induced response analysis of wind turbine tubular towers with consideration of rotating effect of blades

2019 ◽  
Vol 23 (2) ◽  
pp. 289-306
Author(s):  
Tao Huo ◽  
Lewei Tong
Keyword(s):  
Wind Turbine ◽  
Wind Direction ◽  
Calculation Method ◽  
Large Scale ◽  
Element Model ◽  
Dynamic Responses ◽  
Future Research ◽  
Induced Response ◽  
Response Analysis ◽  
Aerodynamic Loads

This study discusses the wind-induced response of existing pitch-controlled 1.25 MW wind turbine structures, with a particular focus on the influence of the blade-rotation effect, cross-wind loads of the tubular tower and the wind direction, and compares numerical responses with the measured dynamic responses. An integrated finite-element model consisting of blades, a nacelle, a tower and a foundation is established. The aerodynamic loads exerted on the rotating blades and the aerodynamic loads acting on the tubular tower are then obtained. A wind-induced response calculation method of the wind turbine structures corresponding to different wind speeds and wind directions is established for performing a wind-induced response analysis. Finally, comparisons between the measured responses and the corresponding numerical response results are performed to verify the accuracy of the proposed wind-induced response calculation method. The results indicate that neglecting the cross-wind aerodynamic loads of large-scale wind turbine structures can lead to unsafe design. The wind direction has different influences on the along-wind and cross-wind dynamic responses. The statistical values of the measured dynamic responses are slightly greater than those of the numerical analysis results, but the magnitudes of the responses are the same. Therefore, the proposed wind-induced response calculation method for wind turbine structures is feasible and reasonable. It can be used to conduct the fatigue life prediction of wind turbine tubular towers in future research which is an important issue in the structural design of wind turbine tubular tower structures.

Fast Frequency-Domain Algorithm for Estimating the Dynamic Wind-Induced Response of Large-Span Roofs Based on Cauchy’s Residue Theorem

2018 ◽  
Vol 18 (03) ◽  
pp. 1850037 ◽  
Author(s):  
Ning Su ◽  
Zhenggang Cao ◽  
Yue Wu
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Rational Functions ◽  
Induced Response ◽  
Response Analysis ◽  
Residue Theorem ◽  
Coupling Effects ◽  
Large Span ◽  
Modal Coupling ◽  
Cauchy’S Residue Theorem

Wind-induced response analysis is an important process in the design of large-span roofs. Conventional time-domain methods are computationally more expensive than frequency-domain algorithms; however, the latter are not as accurate because of the ill-treatment of the modal coupling effects. This paper revisited the derivations of the frequency-domain algorithm and proposed a fast algorithm for estimating the dynamic wind-induced response considering duly the modal coupling effects. With the wind load cross-spectra modeled by rational functions, closed-form solutions to the frequency-domain integrals can be calculated by Cauchy’s residue theorem, rather than by numerical integration, thereby reducing the truncation errors and enhancing the efficiency of computation. The algorithm is applied to the analysis of a grandstand roof and a spherical dome. Through comparison with time domain analyses results, the algorithm is proved to be reliable. A criterion of the coupling modal combination was suggested based on the cumulative modal contribution rate of over 70%.

scholarly journals Evaluation of Wind-Induced Response Bounds of High-Rise Buildings Based on a Nonrandom Interval Analysis Method

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
Xianglei Wei ◽  
An Xu ◽  
Ruohong Zhao
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Wind Tunnel Test ◽  
Wind Load ◽  
Upper And Lower Bounds ◽  
Induced Response ◽  
Response Analysis ◽  
Analysis Method ◽  
High Rise ◽  
Interval Analysis Method

The traditional wind-induced response analysis of high-rise buildings conventionally considers the wind load as a stationary stochastic process. That is, for a certain wind direction angle, the reference wind speed (usually refers to the mean wind speed at the building height) is assumed to be a constant corresponding to a certain return period. Combined with the recorded data in wind tunnel test, the structural response can be computed using the random vibration theory. However, in the actual typhoon process, the average wind speed is usually time-variant. This paper combines the interval process model and the nonrandom vibration analysis method with the wind tunnel test and proposes a method for estimating the response boundary of the high-rise buildings under nonstationary wind loads. With the given upper and lower bounds of time-variant wind excitation, this method can provide an effective calculation tool for estimating wind-induced vibration bounds for high-rise buildings under nonstationary wind load. The Guangzhou East tower, which is 530 m high and the highest supertall building in Guangzhou, China, was taken as an example to show the effectiveness of the method. The obtained boundary response can help disaster prevention and control during the passage of typhoons.

Rise Steel Wind-Induced Response Analysis

2014 ◽  
Vol 1006-1007 ◽  
pp. 56-60
Author(s):  
Ya Nan Hu ◽  
Qing Xu ◽  
Guo Qiang Wu
Keyword(s):  
Shear Deformation ◽  
Dynamic Characteristics ◽  
Response Curve ◽  
Time History ◽  
Wind Load ◽  
Induced Response ◽  
Response Analysis ◽  
Response Curves ◽  
Pressure Time ◽  
Fluctuating Wind

Taking a rise steel as a study, study response of the structure to the dynamic characteristics under fluctuating wind load. The results showed that: deformation of structure under the fluctuating wind load is shear deformation; Structural displacement response curve is similar to the curve of the pressure time history. Because of consider different heights the structure of spatial correlation affect, Displacement positions on different floors response curves are differ.

Wind-Induced Response Analysis of Guyed Mast Earplate Considering Welding Residual Stresses

2010 ◽  
Vol 143-144 ◽  
pp. 95-99 ◽  
Author(s):  
Wen Li Wang ◽  
Wei Lian Qu ◽  
Jie He
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Dynamic Stress ◽  
Equivalent Stress ◽  
Welding Residual Stress ◽  
Induced Response ◽  
Response Analysis ◽  
Von Mises Equivalent Stress ◽  
Von Mises ◽  
Guyed Mast

This paper proposes a new method to calculate the wind-induced dynamic stress response of guyed mast earplate node, which considering the welding residual stresses in earplate weld joint. Firstly, a numerical simulation of weld residual stress of key nodes based on finite element method is presented. Then, taking the welding residual stresses as initial stress, the dynamic stress analysis of the guyed mast earplate’s weld was completed. The results show that in the dual role of the welding residual stress and the wind load, the von Mises equivalent stress of some hot spots in welds have exceeded the material yield stress of steel.

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