Researchers have studied many methods of using active and passive
control devices for absorbing vibratory energy. Active devices,
while providing significant reductions in structural motion,
typically require large (and often multiply-redundant) power
sources, and thereby raise concerns about stability. Passive
devices are fixed and cannot be modified based on information of
excitation or structural response. Semiactive devices on the other
hand can provide significant vibration reductions comparable to
those of active devices but with substantially reduced power
requirements and in a stable manner.
Technology of Semiactive Devices and Applications in
Vibration Mitigation presents the most up-to-date research into
semiactive control systems and illustrates case studies showing
their implementation and effectiveness in mitigating vibration. The
material is presented in a way that people not familiar with
control or structural dynamics can easily understand.
Connecting structural dynamics with control, this book:
* Provides a history of semiactive control and a bibliographic
review of the most common semiactive control strategies.
* Presents state-of-the-art semiactive control systems and
illustrates several case studies showing their implementation and
effectiveness to mitigate vibration.
* Illustrates applications related to noise attenuation, wind
vibration damping and earthquake effects mitigation amongst
others.
* Offers a detailed comparison between collocated and
non-collocated systems.
* Formulates the design concepts and control algorithms in simple
and readable language.
* Includes an appendix that contains critical considerations
about semiactive devices and methods of evaluation of the original
damping of a structure.
Technology of Semiactive Devices and Applications in
Vibration Mitigation is a must-have resource for researchers,
practitioners and design engineers working in civil, automotive and
mechanical engineering. In addition it is undoubtedly the key
reference for all postgraduate students studying in the field.
Cuprins
List of Figures.
List of Tables.
List of Algorithms.
List of Symbols.
Introduction.
Objectives.
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 Control
Strategies.
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 and
Non-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 Semiactive
Damping.
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 Structural
Testing.
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.
Bibliography.
Index.
Despre autor
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
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