Firstly, wind tunnel test of iced quad bundle conductor are carried out, and the aerodynamic coefficients of iced quad bundle conductor are obtained. Then the equivalent aerodynamic coefficients at the central axis of iced quad bundle conductor are obtained by equivalent substitution method. Then, the stable region of the equivalent aerodynamic coefficients of iced quad bundle conductor is analyzed by combining the Den-Hartog galloping mechanism . The cubic fitting expression about aerodynamic coefficients with 2-DOFs is derived, and the galloping characteristics of iced quad bundle conductor are studied by combining the aerodynamic coefficients obtained by wind tunnel test. The experimental results show that the aerodynamic coefficients of each sub-conductor with the same material are obviously different due to the existence of wake effects. Therefore, considering the galloping characteristics of a sub-conductor of quad bundle conductor cannot reflect the galloping characteristics of the whole quad bundle conductor. The results of galloping characteristics show that the displacement in the z-axis direction is dominant at the beginning of the vibration, and then the displacement in the y-axis direction increases slowly due to the negative slope of the aerodynamic loads on the conductor. The displacement in the y-axis direction is much larger than the displacement in the z-axis direction after the vibration is stabilized, and the trajectory of the point could be regarded as an ellipse.
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闵光云,刘小会,严波,等. 覆冰四分裂导线的气动特性与舞动特性[J]. 科学技术与工程, 2020, 20(21): 8607-8615. MIN Guangyun, 刘小会, YAN Bo, et al. Wind Tunnel Test and Galloping Characteristics of Iced Four-Bundle Conductor[J]. Science Technology and Engineering,2020,20(21):8607-8615.