Hybrid Control of Smart Structures Using a Novel Wavelet-Based Algorithm

Abstract

A tuned liquid column damper (TLCD) system provides the same level of vibration suppression as a conventional tuned mass damper (TMD) system but with several advantages. A new hybrid control system is presented through judicious combination of a passive supplementary damping system with a semi-active TLCD system. The new model utilizes the advantages of both passive and semi-active control systems, thereby improving the overall performance, reliability, and operability of the control system during normal operations as well as a power or computer failure. The robust wavelet-hybrid feedback least mean square (LMS) control algorithm developed recently by the authors is used to find optimal values of the control parameters. The effectiveness and robustness of the proposed hybrid damper-TLCD system in reducing the vibrations under various seismic excitations are evaluated through numerical simulations performed for an eight-story frame using three different simulated earthquake ground accelerations. It is found that the new model is effective in significantly reducing the response of the structure under various seismic excitations.

Hybrid viscous damper with filtered integral force feedback control

“…However, improved damping performance compared to the passive case may be obtained by combining pure energy dissipating installations with active elements to form so-called active/passive or hybrid damper systems (Thenozhi and Yu, 2013). Hybrid systems have been proposed for base-isolation (Beard et al, 1994;Xiong et al, 2000;Shin et al, 2013) and seismic protection systems (Tzan and Pantelides, 1994;Sener and Utku, 1998;Kurata et al, 1999;Kim and Adeli, 2005). In these systems the 'passive' properties of the system are often governed by basic load carrying requirements and thereby appear nonoptimal with respect to the transmissibility problem.…”

Improving the vibration suppression capabilities of a magneto-rheological damper using hybrid active and semi-active control

“…For example, active and passive control [1,2], or semi-active and passive control [3,4]. However, to the authors' knowledge, a hybrid combination of active and semi-active control has not been previously studied in detail in this context.…”

Algorithms for chattering reduction in system control

“…A real-life application of the aforementioned differential equation is vibration control of building or bridges structures subjected to earthquake or wind loading [25][26][27][28][29][2][3][4]1,[13][14][15][16][17]24,10,11,5,18,22,21,7]. The state variables are…”