Low-energy structures embedded with smart dampers

Abstract

Building structures, subject to dynamic loadings or external disturbances, may undergo destructive vibrations and encounter different degrees of deformation.Modeling and control techniques can be applied to effectively damp out these vibrations and maintain structural health with a low energy cost. Smart structures embedded with semi-active control devices, offer a promising solution to the problem. The smart damping concept has been proven to be an effective approach for input energy shaping and suppressing unwanted vibrations in structural control for buildings embedded with magnetorheological fluid dampers (MRDs). In this paper, the dissipation energy in MRD is studied by using results from induced hysteretic effect of structural vibrations while the fluid is placed under a controlled magnetic field. Then, a frequency-shaped second-order sliding mode controller (FS2SMC) is designed along with a low-pass filter to implement the desired dynamic sliding surface, wherein the frequency responses of the hysteretic MRD is represented by its magnitude and phase describing functions. The proposed controller can thus shape the frequency characteristics of the equivalent dynamics for the MRD-embedded structure against induced vibrations, and hence, dissipate the energy flow within the smart devices to prevent structural damage. Simulation results for a 10-floor building model equipped with current-controlled MRDs, subject to horizontal seismic excita-

A Review on Structural Configurations of Magnetorheological Fluid Based Devices Reported in 2018–2020

“…As a new type of mechanical device, MRF dampers and mounts have the ability to provide variable damping (Xu et al, 2018b), mitigate adverse vibration (Dong et al, 2018), and recycle kinetic energy (Wang et al, 2018), and play a key role in many fields (Ha et al, 2018;Lv et al, 2020). For different engineering applications, the development of high-performance MRF dampers and mounts has always been a research hotspot, such as adjusting local structure size, optimizing internal magnetic field, and updating configuration design.…”

Design and Modeling for 2D Plate Type MR Damper

“…It is also safe and reliable with low energy consumption and stable temperature (Liao et al, 2002). The unique rheological properties of MRF have attracted wide research interests in various applications, such as in the automotive industry (Edward et al, 2008;Shiao and Nguyen, 2014;Hema et al, 2017), precision polishing (Jang et al, 2010;Anwesa and Manas, 2018;Luo et al, 2018) and buildings (Luu et al, 2014;Ha et al, 2018;Christie et al, 2019). One of the most popular applications is the MR damper which replaced the hydraulic oil with the MRFs in the cylinder of the conventional damper.…”