Optimization of Tuned Mass Dampers
Optimization of Tuned Mass Dampers

Author: Gebrail Bekdaş

Publisher: Springer Nature

Published: 2022-04-07

Total Pages: 193

ISBN-13: 3030983439

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This book is a timely book to summarize the latest developments in the optimization of tuned mass dampers covering all classical approaches and new trends including metaheuristic algorithms. Also, artificial intelligence and machine learning methods are included to predict optimum results by skipping long optimization processes. Another difference and advantage of the book are to provide chapters about several types of control types including passive tuned mass dampers, active tuned mass dampers, tuned liquid dampers, tuned liquid column dampers and inerter dampers. Tuned mass dampers (TMDs) are vibration absorber devices used in all types of mechanic systems. The key factor in the design is an effective tuning of TMDs for the desired performance. In practice, several high-rise structures and bridges were designed by including TMDs. Also, TMDs were installed after the construction of the structures after several negative experiences resulting from the disturbing sway of the structures. In optimum design, several closed-form expressions have been proposed for optimum frequency and damping ratio of TMDs, but the exact optimization requires iterative optimization approaches. The current trend is to use evolutionary algorithms and metaheuristic optimization methods to reach the goal.

A Wind Tunnel Investigation of the Control of Wind-induced Tall Building Vibrations by an Active Tuned Mass Damper
A Wind Tunnel Investigation of the Control of Wind-induced Tall Building Vibrations by an Active Tuned Mass Damper

Author: Robert Joe Facioni

Publisher:

Published: 1994

Total Pages: 110

ISBN-13:

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A wind tunnel investigation was conducted to investigate how effective an Active Tuned Mass Damper (ATMD) was in suppressing the wind-induced vibrations of tall buildings. The model ATMD and model building were developed at a 1:100 scale and tested in a wind tunnel simulating natural wind flow over a suburban terrain at a 1:100 scale. The ATMD model was developed so that parameters such as mass, stiffness and damping could be altered. Consequently, the ATMD was set-up and tested with five various parameter configurations. The ATMD was driven by a sub-optimal control algorithm which used displacement feedback. The optimal phase shift of the control algorithm was determined to be at 110 which was used for all the wind tunnel tests. The wind tunnel investigations demonstrated that the ATMD was effective in reducing both the along-wind and cross-wind responses of the building.

A Critical Review of the Intrinsic Nature of Vortex Induced Vibrations
A Critical Review of the Intrinsic Nature of Vortex Induced Vibrations

Author: Turgut Sarpkaya

Publisher:

Published: 2003

Total Pages: 126

ISBN-13:

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This is a concise and comprehensive review of the progress made during the past two decades on vortex induced vibration (VIV) of mostly circular cylindrical structures subjected to steady uniform flow. The critical elements of the evolution of the ideas, theoretical insights, experimental methods, and numerical models are traced systematically; the strengths and weaknesses of the current state of the understanding of the complex fluid/structure interaction are discussed in some detail. Finally, some suggestions are made for further research on VIV. The organization of the paper is given at the end of the next section.

Effects of a Tuned Mass Damper on Wind-induced Motions in Tall Buildings
Effects of a Tuned Mass Damper on Wind-induced Motions in Tall Buildings

Author: Julien Alexandre Laurent Carlot

Publisher:

Published: 2012

Total Pages: 107

ISBN-13:

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With ever increasing constructability capacities, engineers have found solutions to build taller and taller structures. However, the race for the sky has not only brought up new ways of building, it has also created new problems to face, namely wind-induced motions. In particular, wind loadings are now the source of vibrations in buildings, which have a direct impact on users. While in the past, strength capacities were the main concern, nowadays, human's comfort has become the one of the new primary problems engineers have to face when designing skyscrapers. Several solutions have been developed throughout the years in order to mitigate the response of a building to wind loads, one of which is the Tuned Mass Damper system. This system, which consists of an auxiliary mass added to a structure, significantly reduces motions in high-rise buildings. However, the theory is often based on a harmonic excitation of a building, which is not necessarily the exact representation of wind loads. This paper analyzes the effects of a Tuned Mass Damper on the response of a building to a saw tooth excitation with white noise, which seems to be a better approximation of how wind loads act on tall structures.

Wind Loading of Structures
Wind Loading of Structures

Author: John D. Holmes

Publisher: CRC Press

Published: 2001-06-14

Total Pages: 380

ISBN-13: 9780419246107

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Bridging the gap between wind and structural engineering, Wind Loading of Structures is essential reading for practising civil, structural and mechanical engineers, and graduate students of wind engineering, presenting the principles of wind engineering and providing guidance on the successful design of structures for wind loading by gales, hurricanes, typhoons, thunderstorm downdrafts and tornados.

Building Motion in Wind
Building Motion in Wind

Author: N. Isyumov

Publisher:

Published: 1986

Total Pages: 124

ISBN-13:

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Proceedings of a session at the ASCE Convention, held in Seattle, Washington, April 8, 1986. Sponsored by the Aerodynamics Committee of the Aerospace Division and the Wind Effects Committee of the Structural Division of ASCE. This collection contains six papers examining the motions of buildings produced by wind. The trend towards higher structural efficiency and lower cost has resulted in a generation of lighter and more flexible buildings with a lower inherent capacity for energy dissipation or damping. Unfortunately, this trend has produced structures that are more sensitive to the dynamic action of wind. The emphasis in the design of modern tall buildings has therefore shifted to requirements that control building movements or drift and that limit wind-induced accelerations. Two papers deal with the action of wind on two important tall buildings where designers relied on wind tunnel model tests for information on wind-induced loads and building motions. The design of the Columbia Seafirst Center took advantage of economies possible as a result of wind tunnel studies., and viscoelastic dampers were added to limit the building's motion and wind-induced acceleration. The recorded response of the Allied Bank Plaza during Hurricane Alicia is an extremely important contribution to the understanding of the action of wind on tall buildings; this is the only existing record of the response of a major building under the action of design winds. Another paper discusses a survey of structural damping found in tall buildings, presenting typical damping values for steel and concrete buildings and discussing the variability of such estimates and its implication on design. The final papers consider damping systems that can be added to tall buildings in order to limit their motion. The use of tuned mass dampers and viscoelastic damping units is discussed and examples are presented to show their practical effectiveness. The viscoelastic dampers used in the Columbia Seafirst Center are described.

Random Vibration in Mechanical Systems
Random Vibration in Mechanical Systems

Author: Stephen H. Crandall

Publisher: Academic Press

Published: 2014-05-12

Total Pages: 177

ISBN-13: 1483269000

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Random Vibration in Mechanical Systems focuses on the fundamental facts and theories of random vibration in a form particularly applicable to mechanical engineers. The book first offers information on the characterization and transmission of random vibration. Discussions focus on the normal or Gaussian random process; excitation-response relations for stationary random processes; response of a single-degree-of-freedom system to stationary random excitation; wide-band and narrow-band random processes; and frequency decomposition of stationary random processes. The text then examines failure due to random vibration, including failure due to first excursion up to a certain level; fatigue failure due to a stationary narrow-band random stress process; failure due to an accumulation of damage; failure due to response remaining above a certain level for too great a fraction of the time; and failure mechanisms. The manuscript is a vital reference for mechanical engineers and researchers interested in random vibration in mechanical systems.