[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.12989/sss.2014.13.2.203

Adaptive-length pendulum smart tuned mass damper using shape-memory-alloy wire for tuning period in real time

Pasala, Dharma Theja Reddy (Department of Civil and Environmental Engineering, Rice University)
Nagarajaiah, Satish (Department of Civil and Environmental Engineering and Mechanical Engineering & Material science, Rice University)

Publication Information

Smart Structures and Systems / v.13, no.2, 2014 , pp. 203-217 More about this Journal

Abstract

Due to the shift in paradigm from passive control to adaptive control, smart tuned mass dampers (STMDs) have received considerable attention for vibration control in tall buildings and bridges. STMDs are superior to tuned mass dampers (TMDs) in reducing the response of the primary structure. Unlike TMDs, STMDs are capable of accommodating the changes in primary structure properties, due to damage or deterioration, by tuning in real time based on a local feedback. In this paper, a novel adaptive-length pendulum (ALP) damper is developed and experimentally verified. Length of the pendulum is adjusted in real time using a shape memory alloy (SMA) wire actuator. This can be achieved in two ways i) by changing the amount of current in the SMA wire actuator or ii) by changing the effective length of current carrying SMA wire. Using an instantaneous frequency tracking algorithm, the dominant frequency of the structure can be tracked from a local feedback signal, then the length of pendulum is adjusted to match the dominant frequency. Effectiveness of the proposed ALP-STMD mechanism, combined with the STFT frequency tracking control algorithm, is verified experimentally on a prototype two-storey shear frame. It has been observed through experimental studies that the ALP-STMD absorbs most of the input energy associated in the vicinity of tuned frequency of the pendulum damper. The reduction of storey displacements up to 80 % when subjected to forced excitation (harmonic and chirp-signal) and a faster decay rate during free vibration is observed in the experiments.

Keywords

smart tuned mass damper; adaptive passive tuned mass damper; short time fourier transform; tuned vibration absorbers; dynamic vibration absorbers; shape memory alloy;

Citations & Related Records

Times Cited By KSCI : 2 (Citation Analysis)

Reference
Cited By KSCI

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1	Adaptive length SMA pendulum smart tuned mass damper performance in the presence of real time primary system stiffness change / [Contreras, Michael T.;Pasala, Dharma Theja Reddy;Nagarajaiah, Satish;] / Smart Structures and Systems
2	Smart tuned mass dampers: recent developments / [Nagarajaiah, Satish;Jung, Hyung-Jo;] / Smart Structures and Systems
3	Smart tuned mass dampers: recent developments / [Nagarajaiah, Satish;Jung, Hyung-Jo;] / Smart Structures and Systems
4	Seismic control response of structures using an ATMD with fuzzy logic controller and PSO method / [Shariatmadar, Hashem;Razavi, Hessamoddin Meshkat;] / Structural Engineering and Mechanics