Structures with Semiactive Variable Stiffness Single/Multiple Tuned Mass Dampers

Nagarajaiah, Satish; Sonmez, Ertan

doi:10.1061/(asce)0733-9445(2007)133:1(67)

Cited by 163 publications

(110 citation statements)

References 20 publications

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“…As an example given by Schmitz and Smith [50], when a damper is added to a Single Degree of Freedom (SDOF) system, the amplitude of vibration is significantly reduced at the natural frequency of the main structure as the damper can resonate. The The drawback of the TMD is that it is sensitive to the change of the main structure and is easily outof-tune [54] so that subsequently its effectiveness is significantly reduced. In practice, the natural frequency of building structures can be easily affected by environmental conditions (analogous to how the exterior building environment changes by date), damage due to extreme events, such as earthquakes, and increase/reduction of mass [55][56][57][58].…”

Section: Figure 10 Idealisation Of the Timber Floor System With Tmdmentioning

confidence: 99%

Feasibility of shape memory alloy in a tuneable mass damper to reduce excessive in-service vibration

Huang

Chang

Mosalam

2016

Struct. Control Health Monit.

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Summary The applications of shape memory alloy (SMA) in vibration reduction are benefited by its superelasticity and thermomechanical properties. This study is a part of a series of research projects focused on reduction of timber floor vibration. In this study, the feasibility of this tuneable mass damper is tested for in‐service vibration reduction. At first, the effect of temperature ranging from 11 °C to 120 °C on the dynamic characteristics of SMA was investigated under different pre‐stressed levels. At higher temperatures, the damping ratio reduces while stiffness increases, and vice versa with decreasing temperature. SMA is sensitive to temperature when the pre‐stressed level is near the phase transformation stress. Next, the analytical model of timber floor system was built and idealised as a two‐degree‐of‐freedom system. Thirdly, a series of lab tests were carried out, and a damper consisting of an SMA bar was added on a cantilever beam with different natural frequencies, which represents floor system in the model. The results show that the vibration response of the system can be significantly reduced by the damper developed in this project, when the damper has resonance with the system. The mass of the system was then changed so as to make the damper out‐of‐tuned; the damper was then retuned by cooling/heating on SMA. After retuning of the damper, the response of the system was effectively reduced, which demonstrates the effectiveness and feasibility of employing SMA in the damper system. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Figure 10 Idealisation Of the Timber Floor System With Tmdmentioning

confidence: 99%

Feasibility of shape memory alloy in a tuneable mass damper to reduce excessive in-service vibration

Huang

Chang

Mosalam

2016

Struct. Control Health Monit.

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“…There has been growing interest in variable stiffness isolation systems [3][4][5][6][7][8][9]. These systems work by changing the structural stiffness thereby altering the natural period of the structure and thus escaping resonance.…”

Section: Introductionmentioning

confidence: 99%

Vibration isolation systems, considered as systems with single degree of freedom

Zebilila

Chernov

2017

MATEC Web Conf.

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Abstract:The research considers and analyzes vibration isolation systems, whose design schemes are single degree of freedom systems, including nonlinear elements -displacement limiter and viscous damper. Presented are calculation formulas in closed form for linear systems in operational modes (for harmonic and impulse loads), algorithms and examples of calculation of linear and nonlinear systems in operational and transient modes. The calculation method and the above dependences are written using the transfer (TF) and impulse response functions (IRF) of linear dynamical systems and dependencies that determine the relationship between these functions. The effectiveness of 2 options of vibration isolation systems in transient modes is analyzed. There is significant reduction of load from the equipment to the supporting structures in the starting-stopping modes by the use of displacement limiter.

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“…Fixing the physical properties of the DVA limits the application to a narrowband, harmonically excited vibration problem. Any mechanical component types that can modulate their stiffness provide adaptability to the DVA against nonstationary disturbances [2][3][4][5] but the implementation of such adaptability might be complex.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of an Adaptively Tuned Dynamic Absorber Incorporating Magnetorheological Elastomer with Self-Sensing Property

2016

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The magnetorheological elastomer (MRE) is known to belong to a class of smart materials whose elastic properties can be varied by an externally applied magnetic field. In addition to the property of the field-dependent stiffness change of the MRE, the electrical resistance of the composite is also changed by the induced strain, thereby providing a new selfsensing feature. In the present study, a novel, dynamic vibration absorber is developed using an MRE with a self-sensing function and adaptability. The natural frequency of the absorber is instantaneously tuned to a dominant frequency extracted from the strain signal of MRE. The damping performance test shows that the vibration of a system with one degree-of-freedom that is exposed to a nonstationary disturbance can be adequately reduced by the proposed frequency-tunable dynamic absorber without the use of external sensors.

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Structures with Semiactive Variable Stiffness Single/Multiple Tuned Mass Dampers

Cited by 163 publications

References 20 publications

Feasibility of shape memory alloy in a tuneable mass damper to reduce excessive in-service vibration

Feasibility of shape memory alloy in a tuneable mass damper to reduce excessive in-service vibration

Vibration isolation systems, considered as systems with single degree of freedom

Experimental Investigation of an Adaptively Tuned Dynamic Absorber Incorporating Magnetorheological Elastomer with Self-Sensing Property

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