Rapid Structure Analysis Method of Multi-Segment & Variable Taper Conical Wind Turbine Tower

2013 ◽  
Vol 313-314 ◽  
pp. 847-852
Author(s):  
Tie Qiang Ma ◽  
Shi Rong Wang ◽  
Cheng Yin Xu
Keyword(s):  
Wind Turbine ◽  
Structure Analysis ◽  
Vertical Section ◽  
Modeling Method ◽  
Analysis Method ◽  
Analysis Software ◽  
Effective Factors ◽  
Wind Turbine Tower ◽  
Parameterized Modeling ◽  
Novel Method

To promote the structure analysis efficiency of multi-section & variable taper wind turbine tower, a novel method is proposed. The effective factors are analyzed for the performances of wind turbine tower, and the main parameters of it are found out. Resolution on rapid structure analysis is presented according to standardized FEA flows. The parameterized modeling method of towers vertical section profiles and optimal FEM meshing method are described. Finally, a rapid structure analysis software is completed to check the method, and the SUT 77-1500 wind turbine is taken as the example to verify the feasibility of the method

A Reshaping Method for Wind Turbine RCS Reduction

2015 ◽  
Vol 764-765 ◽  
pp. 457-461 ◽  
Author(s):  
Shyh Kuang Ueng ◽  
Yao Hong Chan
Keyword(s):  
Wind Turbine ◽  
Cross Section ◽  
Wind Turbines ◽  
Electromagnetic Waves ◽  
Reduction Method ◽  
Radar Cross Section ◽  
Modeling Method ◽  
Test Results ◽  
Wind Turbine Tower

This paper presents a Radar Cross Section (RCS) reduction method for wind turbines. In the proposed method, a reshaping procedure is utilized to generate waves or bumps on the surface of the wind-turbine tower. As the tower is illuminated by electromagnetic waves, the reflected rays are perturbed by the convex structures and the RCS of the wind turbine is decreased. Test results conclude that our modeling method reduces the average RCS values. The scatterings in the directions of the convex structures are significantly declined.

scholarly journals A Study on the Natural Frequency of Wind Turbine Tower Regarding to Modeling Method

2015 ◽  
Vol 16 (3) ◽  
pp. 2272-2278
Author(s):  
Yun-Woo Lee ◽  
Min-Seo Jang ◽  
Soung-Yong Kang ◽  
Pyoung-Hwa Kim ◽  
Young-Jong Kang
Keyword(s):  
Wind Turbine ◽  
Natural Frequency ◽  
Modeling Method ◽  
Wind Turbine Tower

A Circuit Model for Lightning Surge of Wind Turbine Tower with an Internal Conductor

2015 ◽  
Vol 135 (3) ◽  
pp. 200-206 ◽  
Author(s):  
Yoki Ikeda ◽  
Naoto Nagaoka ◽  
Yoshihiro Baba
Keyword(s):  
Wind Turbine ◽  
Circuit Model ◽  
Wind Turbine Tower

Seismic response analysis of steel–concrete hybrid wind turbine tower

2021 ◽  
pp. 107754632110075
Author(s):  
Junling Chen ◽  
Jinwei Li ◽  
Dawei Wang ◽  
Youquan Feng
Keyword(s):  
Wind Turbine ◽  
Response Spectrum ◽  
Ground Motions ◽  
Time History ◽  
Seismic Action ◽  
Response Spectrum Method ◽  
Spectrum Method ◽  
Wind Turbine Tower ◽  
Ground Types ◽  
Nonlinear Time History

The steel–concrete hybrid wind turbine tower is characterized by the concrete tubular segment at the lower part and the traditional steel tubular segment at the upper part. Because of the great change of mass and stiffness along the height of the tower at the connection of steel segment and concrete segment, its dynamic responses under seismic ground motions are significantly different from those of the traditional steel tubular wind turbine tower. Two detailed finite element models of a full steel tubular tower and a steel–concrete hybrid tower for 2.0 MW wind turbine built in the same wind farm are, respectively, developed by using the finite element software ABAQUS. The response spectrum method is applied to analyze the seismic action effects of these two towers under three different ground types. Three groups of ground motions corresponding to three ground types are used to analyze the dynamic response of the steel–concrete hybrid tower by the nonlinear time history method. The numerical results show that the seismic action effect by the response spectrum method is lower than those by the nonlinear time history method. And then it can be concluded that the response spectrum method is not suitable for calculating the seismic action effects of the steel–concrete hybrid tower directly and the time history analyses should be a necessary supplement for its seismic design. The first three modes have obvious contributions on the dynamic response of the steel–concrete hybrid tower.

Electric Resistive Heat Curing of the Fiber-Matrix Interphase in Graphite/Epoxy Composites

1991 ◽  
Author(s):  
Erol Sancaktar ◽  
Weijian Ma ◽  
Steven W. Yurgartis
Keyword(s):  
Carbon Fiber ◽  
Heat Conduction Problem ◽  
Electric Heating ◽  
Single Fiber ◽  
Analysis Method ◽  
Fracture Properties ◽  
Temperature Distributions ◽  
Heat Curing ◽  
Convective Thermal ◽  
Novel Method

Abstract A novel method for tailoring the interphase of carbon fiber-polymer composites by resistive electric heating is presented. The single fiber-epoxy resin tensile test is used to investigate the adhesion and fracture properties of the interphase. Electric resistive heating is shown to increase adhesion and toughness at the interphase region. In analyzing the results, the strength and fracture energy of the interphase are related to the thermal postcure conditions created by resistive electric heating. For this purpose, difference analysis method is used to obtain numerical solution for heat conduction problem in the single fiber test specimen and the temperature distributions are plotted. Improvements obtained using resistive electric heating via carbon fiber are compared with those obtained by postcuring of the whole sample via convective thermal postcuring. The results obtained using these two different postcure methods seem to be similar with electric heating procedure producing superior benefits in both increased toughness and adhesion.

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