Journal of Vibration and Shock. 2014, (04) Core

Iced conductor galloping based on strong geometric nonlinear factorsChinese Full Text

LIU Hai-ying;ZHANG Qi-chang;HAO Shu-ying;School of Mechanical Engineering,Tianjin University;School of Mechanical Engineering,Tianjin University of Technology;Tianjin Key Laboratory of Nonlinear Dynamics and Chaos Control;

Abstract: The ratio of every coefficient of nonlinear stiffness terms to coefficient of linear stiffness term at different horizontal tension levels was analysed for the first three vibration modes of an iced conductor. Through discussing the relationship among amplitude of vibration,horizontal tension,linear restoring force and nonlinear restoring force,the main factors influencing strong or weak geometric nonlinearity of an icied conductor system were determined. On this basis,the steady state amplitudes and vibration frequency of the system were calculated with the undetermined natural frequency method. Numerical results showed that the amplitudes of its vibration modes increase with increase in wind velocity; natural frequency of each vibration mode is far from its initial value when the system is subjected to the effect of strong geometric nonlinearity. The analysis results with the conventional normal form theory were difficult to meet the accuracy requirements of model analysis,but the analysis results here could grasp the vibration characteristics of the model of an iced conductor system well.

Keywords：

strong geometric nonlinearity; Galerkin integral method; normal form; undetermined natural frequency;

DOI：
10.13465/j.cnki.jvs.2014.04.015
Series：
Subject：
Classification Code：
TM752.5;O322

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Iced conductor galloping based on strong geometric nonlinear factorsChinese Full Text

LIU Hai-ying;ZHANG Qi-chang;HAO Shu-ying;School of Mechanical Engineering,Tianjin University;School of Mechanical Engineering,Tianjin University of Technology;Tianjin Key Laboratory of Nonlinear Dynamics and Chaos Control;

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