Research On Multi-mode Vibration Control Of The Stayed-cables With TMDS

With the rapid development of the world’s traffic engineering,cable-stayed bridge has become one of the most competitive bridge typein the medium and large-span bridge,and how to control cable vibrationeffectively has become one of the key issues that large span cable-stayedbridge to be solved. Setting mechanical damper in cable-stayed and deckhas been widely used to suppress the large amplitude vibration of thecable, but practice shows that affected by the installation location,theefficiency of the general mechanical damper is far from the theoreticalmaximum.At the same time, the stay cables excited by the external loadmay often occurs multi-modal vibration, however,the design of thepassive damping cable vibration control is based on single modal optimalcontrol theory which would greatly reduce the effect of cable vibrationcontrol. TMD (tuned mass damper) whose installation location is notlimited,is able to overcome these shortcomings of the general mechanicaldamper. Multi-modal vibration control of cables based on TMD has beenstudied in this paper, the main contents are:(1) Based on the theory and numerical analysising of multi-modalvibration of the stay cable with multi-TMD or smart TMD,the effect ofTMD parameters on cable vibration control, the effectiveness ofoptimizing parameters of the TMD on cable vibration control, theeffectiveness of multi-modal vibration control, the travel requirementsof TMD and so on are discussed.(2) With Simulink simulation,the modal of taut cable-linear TMDsystem is calculated, the effectiveness of setting one or multiple linearTMDs on the stay cable to control the single or multi-modal vibration isstudied; Futhermore, the modal of taut cable-nonlinear TMD system iscalculated, the effectiveness of the index number of velocity,getting hardstiffness of nonlinear TMD are studied, and some relevant conclusionsare draw finally.