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osu1039128747.pdf (1.9 MB)
ETD Abstract Container
Abstract Header
WAVELET-BASED ADAPTIVE CONTROL OF STRUCTURES UNDER SEISMIC AND WIND LOADS
Author Info
Kim, Hongjin
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=osu1039128747
Abstract Details
Year and Degree
2002, Doctor of Philosophy, Ohio State University, Civil Engineering.
Abstract
A new control algorithm, wavelet-hybrid feedback LMS algorithm, is developed to overcome the shortcomings of the classical feedback control algorithms and the filtered-x LMS control algorithm. It integrates a feedback control algorithm such as the LQR or LQG algorithm with the filtered-x LMS algorithm and utilizes a wavelet multi-resolution analysis for the low-pass filtering of external dynamic excitations. Since the control forces determined by the filtered-x LMS algorithm are adapted by updating the FIR filter coefficients at each sampling time until the output error is minimized, the new control algorithm is effective in control of both steady-state and transient vibrations. It is shown that the algorithm is capable of suppressing vibrations over a range of input excitation frequencies unlike the classic feedback control algorithms whose control effectiveness decreases considerably when the frequency of the external disturbance differs from the fundamental frequency of the system. Further, results demonstrate that the wavelet transform can be effectively used as a low-pass filter for control of civil structures without any significant additional computational burden. A new hybrid control system, hybrid damper-TLCD system, is developed through judicious integration of a passive supplementary viscous fluid damping system with a semi-active TLCD system, and its performance is evaluated for control of responses of 3D irregular buildings under various seismic excitations and for control of wind-induced motion of high-rise buildings. The new hybrid control system utilizes the advantages of both passive and semi-active control systems along with improving the overall performance and eliminating the need for a large power requirement, unlike other proposed hybrid control systems where active and passive systems are combined. Simulation results show that the new hybrid control system is effective in reducing the response of structures significantly under seismic excitations as well as wind loads. It is also demonstrated that the hybrid control system provides increased reliability and maximum operability during normal operations as well as a power or computer failure.
Committee
Hojjat Adeli (Advisor)
Pages
307 p.
Subject Headings
Engineering, Civil
Keywords
wavelets
;
structural control
;
semi-active control
;
hybrid control
;
bridge control
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Citations
Kim, H. (2002).
WAVELET-BASED ADAPTIVE CONTROL OF STRUCTURES UNDER SEISMIC AND WIND LOADS
[Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1039128747
APA Style (7th edition)
Kim, Hongjin.
WAVELET-BASED ADAPTIVE CONTROL OF STRUCTURES UNDER SEISMIC AND WIND LOADS.
2002. Ohio State University, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=osu1039128747.
MLA Style (8th edition)
Kim, Hongjin. "WAVELET-BASED ADAPTIVE CONTROL OF STRUCTURES UNDER SEISMIC AND WIND LOADS." Doctoral dissertation, Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1039128747
Chicago Manual of Style (17th edition)
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Document number:
osu1039128747
Download Count:
20,995
Copyright Info
© 2002, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.