Experimental Study on Vortex-Induced Vibration of Steel Tubes in Transmission Towers at Various Inflow Conditions
Abstract
:1. Introduction
2. Experiment
2.1. Test Setups
2.2. Properties of Turbulent Flow
2.3. Definition of Yaw Angles
3. VIV of the Steel Tube in Uniform Flow
3.1. VIV Response
3.2. Time-Frequency Analysis of VIV Response
4. Effect of the Turbulence Intensity
4.1. Amplitude and Frequency
4.2. Response Characteristics
5. Effect of the Yaw Angle
5.1. Amplitude and Frequency
5.2. Response Characteristics
6. Conclusions
- (1)
- Compared to the VIV in the CF direction, the VIV response in the IL direction is negligible. In particular, the VIV maximum amplitude of the steel tube in the IF direction only accounts for about 20% compared to that in the CF direction.
- (2)
- The VIV amplitude of the steel tube decreases significantly as the turbulence intensity increases and the decreasing trends can be reasonably fitted by the quadratic function. The width lock-in region was found to be wider in turbulence compared to that in uniform flows.
- (3)
- Compared with the normal-incidence case, the VIV maximum amplitude almost remains constant in the case of α = 10° and α = 20°, while it decreased sharply for α = 30° and 40°. Moreover, the width lock-in region gradually increases as the angle of inclination increases, except for α = 10°, while the onset velocities of the lock-in region are similar for all cases.
- (4)
- When α ≤ 10°, the independence principle (IP) is applicable for inclined steel tubes in terms of both response amplitude and frequency.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Terms | Units | Values |
---|---|---|
Diameter (D) | m | 0.042 |
Thickness (t) | m | 0.0012 |
Unit mass (m) | kg/m | 1.2 |
Length (l0) | m | 2.08 |
Frequency (fn) | Hz | 30.42 |
Mass ratio (M*) | - | 711 |
Damping ratio (ξ) | - | 0.0032 |
Flow | Iu (%) | Lu/D |
---|---|---|
Uniform flow | 0.4 | - |
Low turbulence (Grid1) | 5.9 | 3.37 |
Medium turbulence (Grid2) | 9.7 | 5.76 |
High turbulence (Grid3) | 12.6 | 6.39 |
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Li, Z.; Wang, Z.; Li, J.; Liu, S. Experimental Study on Vortex-Induced Vibration of Steel Tubes in Transmission Towers at Various Inflow Conditions. Buildings 2023, 13, 252. https://doi.org/10.3390/buildings13010252
Li Z, Wang Z, Li J, Liu S. Experimental Study on Vortex-Induced Vibration of Steel Tubes in Transmission Towers at Various Inflow Conditions. Buildings. 2023; 13(1):252. https://doi.org/10.3390/buildings13010252
Chicago/Turabian StyleLi, Zhengliang, Zhisong Wang, Jiahong Li, and Siyuan Liu. 2023. "Experimental Study on Vortex-Induced Vibration of Steel Tubes in Transmission Towers at Various Inflow Conditions" Buildings 13, no. 1: 252. https://doi.org/10.3390/buildings13010252