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Technology of Semiactive Devices and Applications in Vibration Mitigation / Edition 1

Technology of Semiactive Devices and Applications in Vibration Mitigation / Edition 1


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Technology of Semiactive Devices and Applications in Vibration Mitigation / Edition 1

Researchers have studied many methods of using active and passivecontrol devices for absorbing vibratory energy. Active devices,while providing significant reductions in structural motion,typically require large (and often multiply-redundant) powersources, and thereby raise concerns about stability. Passivedevices are fixed and cannot be modified based on information ofexcitation or structural response. Semiactive devices on the otherhand can provide significant vibration reductions comparable tothose of active devices but with substantially reduced powerrequirements and in a stable manner.

Technology of Semiactive Devices and Applications inVibration Mitigation presents the most up-to-date research intosemiactive control systems and illustrates case studies showingtheir implementation and effectiveness in mitigating vibration. Thematerial is presented in a way that people not familiar withcontrol or structural dynamics can easily understand.

Connecting structural dynamics with control, this book:

  • Provides a history of semiactive control and a bibliographicreview of the most common semiactive control strategies.
  • Presents state-of-the-art semiactive control systems andillustrates several case studies showing their implementation andeffectiveness to mitigate vibration.
  • Illustrates applications related to noise attenuation, windvibration damping and earthquake effects mitigation amongstothers.
  • Offers a detailed comparison between collocated andnon-collocated systems.
  • Formulates the design concepts and control algorithms in simpleand readable language.
  • Includes an appendix that contains critical considerationsabout semiactive devices and methods of evaluation of the originaldamping of a structure.

Technology of Semiactive Devices and Applications inVibration Mitigation is a must-have resource for researchers,practitioners and design engineers working in civil, automotive andmechanical engineering. In addition it is undoubtedly the keyreference for all postgraduate students studying in the field.

Product Details

ISBN-13: 9780470022894
Publisher: Wiley
Publication date: 04/21/2006
Pages: 268
Product dimensions: 6.22(w) x 9.21(h) x 0.79(d)

About the Author

Fabio Casciati, Department of Structural Mechanics, University of Pavia, Italy

Georges Magonette, Head of ELSA lab. (European Laboratory for Structural Assessment) of the Joint Research Centre of European Commission, Ispra, Italy

Francesco Marazzi, Consultant on Dynamics, Brinzio, Italy

Table of Contents

List of Figures.

List of Tables.

List of Algorithms.

List of Symbols.



Organization of the Book.

1 Reliability, Robustness and Structural Control.

1.1 Preliminary Concepts.

1.2 Definitions.

1.3 System Representation.

1.4 A Comparison of Passive, Active and Semiactive ControlStrategies.

2 Collocated and Non-collocated Systems.

2.1 Introduction.

2.2 Definition of Collocated System.

2.3 Centralized and Non-centralized Systems.

2.4 Linear and Non-linear Systems.

2.5 The Problem of Spillover.

2.6 Advantages and Disadvantages of Collocated andNon-collocated Systems.

2.7 A Numerical Comparison.

3 Semiactive Devices.

3.1 The Basic Idea and a Brief History.

3.2 Variable Viscous Devices.

3.3 Variable Stiffness Devices.

3.4 Magnetorheological Devices.

3.5 Friction Devices.

3.6 Tuned Liquid Dampers.

3.7 Electro-inductive Device.

3.8 Air-jet Actuators.

3.9 SMA Actuators.

4 Semiactive Control Laws.

4.1 Control Strategies and Algorithms for SemiactiveDamping.

4.2 Implementation Schemes.

5 Implementation of Semiactive Control Strategies.

5.1 Introduction.

5.2 Hardware Control Implementation.

5.3 Real-time Software.

5.4 Non-centralized Control Versus Collocated Systems.

6 Experimental Verification.

6.1 Introduction.

6.2 The Challenges of Performance-based Design in StructuralTesting.

6.3 Base-isolated Buildings and Bridges.

6.4 Supplemental Damping Devices.

6.5 Experimental Methods in Structural Dynamics.

6.6 Assessment of Structural Control Devices.

7 Stability and Foreseen Developments.

7.1 Preliminary Concepts.

7.2 Semiactive Features.

7.3 Conclusions.

Appendix A: Damping.

A.1 Types of Damping.

A.2 Why Have a Damping Matrix?

A.3 Rayleigh Damping.



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