Single input magnetorheological pseudo negative stiffness control for bridge stay cables

Abstract

The bridge stay cable, one of the most critical components in cable-stayed bridges, is vulnerable to vibrations owing to its low inherent damping capacity. Thus effective vibration control technology for bridge stay cables is extremely critical to safe operations of cable-stayed bridges. Several countermeasures have been presented and/or implemented to mitigate this vibration; however the passive method can only add a small amount of damping to the cables, excessive energy demand of active control devices severely limits its practicality, the semi-active control methods still have the drawbacks of complex state estimation module and a large amount of control algorithm calculation. This paper proposes a practical magnetorheological pseudo negative stiffness (MR-PNS) control system coupled with control strategy for bridge stay cables. The current reference point is introduced in the dynamic modeling of the MR-PNS control system to characterize the current control strategy. This paper investigates the adjustable of MR-PNS control system performance and energy consumption caused by different current strategies. Taking the vibration control of the Nanjing Second Yangtze River Bridge J20 cable as an example, the simulation results highlight the advantages of the MR-PNS control system that the failure area is small, the quasi-optimal area is wide, and it can still keep sort of vibration damping performance in the degenerate area. The model cable vibration control test proves the feasibility and efficiency of the single input MR-PNS bridge stay cables control method.

Multimode vibration control of stay cables using pseudo negative stiffness MR damping system

“…According to the previous research results, it is known that, these three parameters above are current independent parameters of MR damper (Xu et al, 2021a). While it is the yield strength F y that links the forceelectric relationship of the MR control device.…”

“…where c 0 and k denote the inherent damping and stiffness coefficient respectively, β is a parameter that portrays the velocity hysteresis feature of MR damper. According to the previous research results, it is known that, these three parameters above are current independent parameters of MR damper (Xu et al, 2021a). While it is the yield strength F y that links the force-electric relationship of the MR control device.…”

“…Figure 3 shows the mechanical properties of the MR-PNS system with the linear decay current strategy. The development of this control system and the measured performance can be found in the previous literature (Xu et al, 2021a).…”

Shaking Table Attached to Magnetorheological Damper: Simulation and Experiments for Structural Engineering

“…This feature makes the so-called MR damper a unique device: controlling the magnetic field intensity of the fluid within the MR damper means controlling the MR damper stiffness. Because of its fast response to changing stiffness, the MR damper has found applications in aircraft landing gear [ 7 ], vehicle suspension [ 8 , 9 , 10 ], cable-stayed bridges [ 11 , 12 ], energy harvesting [ 13 ], and rehabilitation robotics [ 14 , 15 , 16 ].…”

A grey hysteresis model of magnetorheological damper

“…Magnetorheological materials, as a new type of intelligent material, have the characteristics of reversible rheological performance, continuously adjustable stiffness, and damping in the millisecond range, and can be semi-actively controlled by an external magnetic field. MR damper as intelligent core component has been successfully applied in engineering fields including, but not limited to, suspension system (Du et al, 2021; Yang et al, 2021; Yoon et al, 2021), energy absorber (Singh et al, 2014; Wereley et al, 2011; Xi et al, 2021), bridge (Tu et al, 2011; Xu et al, 2021), and gun recoil system (Li et al, 2019). However, the mechanical properties of such devices are affected by uncertain factors such as the excitation frequency, excitation amplitude, and magnetic field, which makes the damp exhibit strong nonlinear behavior.…”