Galloping Stability and Aerodynamic Characteristic of Iced Transmission Line Based on 3-DOF
A new calculation method of critical wind speed based on three degrees of freedom (3-DOF) is proposed for galloping problem of iced transmission line. Based on the quasistatic theory, the aerodynamic load of iced transmission line is obtained, which considers the influence of transverse and torsiona...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2020/8828319 |
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| _version_ | 1832566322193498112 |
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| author | Xiaohui Liu Ming Zou Chuan Wu Bo Yan Mengqi Cai |
| author_facet | Xiaohui Liu Ming Zou Chuan Wu Bo Yan Mengqi Cai |
| author_sort | Xiaohui Liu |
| collection | DOAJ |
| description | A new calculation method of critical wind speed based on three degrees of freedom (3-DOF) is proposed for galloping problem of iced transmission line. Based on the quasistatic theory, the aerodynamic load of iced transmission line is obtained, which considers the influence of transverse and torsional motion on the relative wind angle of attack. Finally, the equivalent galloping model of 3-DOF iced transmission line is established. At the initial angle of attack, the aerodynamic load is expanded by Taylor, and the unsymmetrical linear aerodynamic coefficient matrix is obtained. The Routh–Hurwitz criterion is used to judge the stability of iced transmission line system, and then the critical wind speed is calculated. The in-plane and out-plane frequencies corresponding to the first-order mode of the transmission line are solved by the analytical method and numerical simulation method. The results obtained by the two methods are compared and verified. The influence of dimensionless transmission line parameter λ on the in-plane and out-of-plane frequencies is discussed. The aerodynamic coefficients of the iced transmission line are measured by wind tunnel test and the aerodynamic characteristics are analyzed. According to the theoretical formula, the critical wind speed is calculated by MATLAB. The critical wind speed determined in this paper is compared with the critical wind speed determined by Den Hartog and Nigol theory. The influences of torsional vibration frequency, ice thickness, and ice shape on critical wind speed are analyzed. The research results of this paper have important theoretical significance for the stability judgment of iced transmission lines. |
| format | Article |
| id | doaj-art-187575b0a05645118a580bd8cc367442 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-187575b0a05645118a580bd8cc3674422025-02-03T01:04:22ZengWileyShock and Vibration1070-96221875-92032020-01-01202010.1155/2020/88283198828319Galloping Stability and Aerodynamic Characteristic of Iced Transmission Line Based on 3-DOFXiaohui Liu0Ming Zou1Chuan Wu2Bo Yan3Mengqi Cai4State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaCollege of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaState Grid Henan Electric Power Research Institute, Zhengzhou 450052, ChinaCollege of Aerospace Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, ChinaA new calculation method of critical wind speed based on three degrees of freedom (3-DOF) is proposed for galloping problem of iced transmission line. Based on the quasistatic theory, the aerodynamic load of iced transmission line is obtained, which considers the influence of transverse and torsional motion on the relative wind angle of attack. Finally, the equivalent galloping model of 3-DOF iced transmission line is established. At the initial angle of attack, the aerodynamic load is expanded by Taylor, and the unsymmetrical linear aerodynamic coefficient matrix is obtained. The Routh–Hurwitz criterion is used to judge the stability of iced transmission line system, and then the critical wind speed is calculated. The in-plane and out-plane frequencies corresponding to the first-order mode of the transmission line are solved by the analytical method and numerical simulation method. The results obtained by the two methods are compared and verified. The influence of dimensionless transmission line parameter λ on the in-plane and out-of-plane frequencies is discussed. The aerodynamic coefficients of the iced transmission line are measured by wind tunnel test and the aerodynamic characteristics are analyzed. According to the theoretical formula, the critical wind speed is calculated by MATLAB. The critical wind speed determined in this paper is compared with the critical wind speed determined by Den Hartog and Nigol theory. The influences of torsional vibration frequency, ice thickness, and ice shape on critical wind speed are analyzed. The research results of this paper have important theoretical significance for the stability judgment of iced transmission lines.http://dx.doi.org/10.1155/2020/8828319 |
| spellingShingle | Xiaohui Liu Ming Zou Chuan Wu Bo Yan Mengqi Cai Galloping Stability and Aerodynamic Characteristic of Iced Transmission Line Based on 3-DOF Shock and Vibration |
| title | Galloping Stability and Aerodynamic Characteristic of Iced Transmission Line Based on 3-DOF |
| title_full | Galloping Stability and Aerodynamic Characteristic of Iced Transmission Line Based on 3-DOF |
| title_fullStr | Galloping Stability and Aerodynamic Characteristic of Iced Transmission Line Based on 3-DOF |
| title_full_unstemmed | Galloping Stability and Aerodynamic Characteristic of Iced Transmission Line Based on 3-DOF |
| title_short | Galloping Stability and Aerodynamic Characteristic of Iced Transmission Line Based on 3-DOF |
| title_sort | galloping stability and aerodynamic characteristic of iced transmission line based on 3 dof |
| url | http://dx.doi.org/10.1155/2020/8828319 |
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