EQUIVALENT MODEL OF STAY CABLE WITH A DAMPER FOR EXPERIMENTAL STUDY
An equivalent model with short length,which could be set in laboratory,is proposed for experiment studies on cable vibration control.The equivalent model attached with a full scale damper aims to simulate behaviors of a damped stay-cable interpreted by taut cable-linear viscous damper theory.Specifically,with the same optimal damper,the equivalent model can achieve the same natural frequency and modal damping as those calculated by taut cable theory for a full scale cable-damper system.Firstly,the model and relevant parameters are proposed by a conceptual analysis;then taut cable-linear viscous damper theory is reviewed,and the parameter analysis is carried out to explore the dynamics characteristics of the model,where numerical method is applied;finally,by comparing the dynamic characteristics of the taut cable and equivalent model,a designing approach is derived.As the verification,the simulation of a cable and its equivalent model are conducted via the finite element method and results illustrate that the errors of the frequency and modal damping ratio are less than 5%,indicating the equivalence.