Active Modal Control of Rain-Wind Induced Vibration of Stay Cables

TY - GEN

T1 - Active Modal Control of Rain-Wind Induced Vibration of Stay Cables

AU - Holm Krarup, Niels

AU - Zhang, Zili

AU - Kirkegaard, Poul Henning

PY - 2017

Y1 - 2017

N2 - Rain-wind induced vibrations have been observed on numerous cable-stayed bridges around the world, which has resulted in an urgent need to gain further understanding of the phenomenon and to develop efficient means of mitigating the large-amplitude vibrations. It is believed that this aeroelastic instability problem is due to the formation and oscillation of a water rivulet on the upper cable surface, which changes the cable aerodynamics and absorbs energy into the system. In this paper, an analytical study of the phenomenon is conducted by formulating a finite element model for the cable and the upper rivulet with non-linear coupling effect. Linearization of the equations of motion of the cable-rivulet system is next carried out, based on which active vibration controller can be designed. Pole allocation control method has been employed for mitigating RWIV in the present study, which is able to add sufficient damping to several excited modes. The active controller is designed such that the closed-loop poles are allocated on the left half of the complex plane of eigenvalues. The controller gains obtained from the equivalent linear system are then applied to the original non-linear cable-rivulet system. Simulation results show that the proposed active modal controller performs much better in suppressing RWIV than an optimally tuned linear viscous damper.

AB - Rain-wind induced vibrations have been observed on numerous cable-stayed bridges around the world, which has resulted in an urgent need to gain further understanding of the phenomenon and to develop efficient means of mitigating the large-amplitude vibrations. It is believed that this aeroelastic instability problem is due to the formation and oscillation of a water rivulet on the upper cable surface, which changes the cable aerodynamics and absorbs energy into the system. In this paper, an analytical study of the phenomenon is conducted by formulating a finite element model for the cable and the upper rivulet with non-linear coupling effect. Linearization of the equations of motion of the cable-rivulet system is next carried out, based on which active vibration controller can be designed. Pole allocation control method has been employed for mitigating RWIV in the present study, which is able to add sufficient damping to several excited modes. The active controller is designed such that the closed-loop poles are allocated on the left half of the complex plane of eigenvalues. The controller gains obtained from the equivalent linear system are then applied to the original non-linear cable-rivulet system. Simulation results show that the proposed active modal controller performs much better in suppressing RWIV than an optimally tuned linear viscous damper.

KW - FE model

KW - Stay cable

KW - active vibration control

KW - pole allocation method

KW - rain-wind induced vibration

U2 - 10.1016/j.proeng.2017.09.506

DO - 10.1016/j.proeng.2017.09.506

M3 - Conference article

SN - 1877-7058

VL - 199

SP - 3158

EP - 3163

JO - Procedia Engineering

JF - Procedia Engineering

T2 - X International Conference on Structural Dynamics, EURODYN 2017

Y2 - 10 September 2017

ER -