Aeroelasticity and resonance characteristics analysis of ice-covered transmission lines under aerodynamic and external loads
To further study the nonlinear vibration problem of iced power lines,this paper analyzes the dancing characteristics of power lines considering aerodynamic loads and external excitations.First,the mechanical model of the iced transmission line under aerodynamic load and external excitation is built and the nonlinear dancing equation of the model is derived.Then,based on the Galerkin method,the derived nonlinear dance equation is converted into an ordinary differential equation,and the amplitude-frequency response functions of the principal resonance and harmonic resonance of the model are obtained by using the multi-scale method.Finally,a numerical analysis is conducted.Our results show when the main resonance is generated in the transmission line,the response amplitude will be synchronized and out of step with the change of tuning parameters,and the increase of external excitation load or wind speed will increase the response amplitude of the system and show multi-value and instability.The increase of tension reduces the response amplitude of the system and weakens its nonlinear characteristics.The response amplitude of harmonic resonance increases with the rise of external excitation load or wind speed,showing multi-value and jumping,and the resonance peak shifts to the right direction of the tuning parameter,and the system exhibits the hard spring characteristics.
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