Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating Airflow
Galloping of an iced transmission line subjected to a moderating airflow has been analysed in this study, and a new form of galloping is discovered both theoretically and experimentally. The partial differential equations of the iced transmission line are established based on the Hamilton theory. Th...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/9969435 |
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| _version_ | 1832546879627329536 |
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| author | Bing Huo Xuliang Li Fujiang Cui Shuo Yang |
| author_facet | Bing Huo Xuliang Li Fujiang Cui Shuo Yang |
| author_sort | Bing Huo |
| collection | DOAJ |
| description | Galloping of an iced transmission line subjected to a moderating airflow has been analysed in this study, and a new form of galloping is discovered both theoretically and experimentally. The partial differential equations of the iced transmission line are established based on the Hamilton theory. The Galerkin method is then applied on the continuous model, and a discrete model is derived along with its first two in-plane and torsional modes. A trapezoidal wind field model is built through the superposition of simple harmonic waves. The vibrational amplitude is generally observed to be more violent when the wind velocity decreases, except in the 2nd in-plane mode. Furthermore, the influence of the declining wind velocity rates on galloping is analysed using different postdecline wind velocities and the duration of the decline in wind velocities. Subsequently, an experiment has been carried out on a continuous model of an iced conductor in the wind tunnel dedicated for galloping. The first two in-plane modal profiles are observed, along with their response to the moderating airflow. Different declining rates of the wind velocity are also verified in the wind tunnel, which show good agreement with the results simulated by the mathematical model. The sudden increase in the galloping amplitude poses a significant threat to the transmission system, which also improves the damage mechanism associated with the galloping of a slender, a long structure with a noncircular cross-section. |
| format | Article |
| id | doaj-art-67ae7bbf39cf49ecb94990f3b4bf278e |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-67ae7bbf39cf49ecb94990f3b4bf278e2025-02-03T06:46:44ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/99694359969435Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating AirflowBing Huo0Xuliang Li1Fujiang Cui2Shuo Yang3School of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300222, ChinaSchool of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300222, ChinaDepartment of Mechanics, Tianjin University, Tianjin 300072, ChinaTianjin Key Lab of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, Tianjin 300222, ChinaGalloping of an iced transmission line subjected to a moderating airflow has been analysed in this study, and a new form of galloping is discovered both theoretically and experimentally. The partial differential equations of the iced transmission line are established based on the Hamilton theory. The Galerkin method is then applied on the continuous model, and a discrete model is derived along with its first two in-plane and torsional modes. A trapezoidal wind field model is built through the superposition of simple harmonic waves. The vibrational amplitude is generally observed to be more violent when the wind velocity decreases, except in the 2nd in-plane mode. Furthermore, the influence of the declining wind velocity rates on galloping is analysed using different postdecline wind velocities and the duration of the decline in wind velocities. Subsequently, an experiment has been carried out on a continuous model of an iced conductor in the wind tunnel dedicated for galloping. The first two in-plane modal profiles are observed, along with their response to the moderating airflow. Different declining rates of the wind velocity are also verified in the wind tunnel, which show good agreement with the results simulated by the mathematical model. The sudden increase in the galloping amplitude poses a significant threat to the transmission system, which also improves the damage mechanism associated with the galloping of a slender, a long structure with a noncircular cross-section.http://dx.doi.org/10.1155/2021/9969435 |
| spellingShingle | Bing Huo Xuliang Li Fujiang Cui Shuo Yang Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating Airflow Shock and Vibration |
| title | Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating Airflow |
| title_full | Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating Airflow |
| title_fullStr | Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating Airflow |
| title_full_unstemmed | Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating Airflow |
| title_short | Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating Airflow |
| title_sort | theoretical analysis and experimental validation on galloping of iced transmission lines in a moderating airflow |
| url | http://dx.doi.org/10.1155/2021/9969435 |
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