Adaptive Structures Engineering Applications

by Wagg, David; Bond, Ian; Weaver, Paul; Friswell, Michael

• ISBN13: 9780470056974
• ISBN10: 0470056975
• Edition: 1st
• Format: Hardcover
• Copyright: 2007-07-16
• Publisher: WILEY

Summary

Adaptive structures have the ability to adapt, evolve or change their properties or behaviour in response to the environment around them. The analysis and design of adaptive structures requires a highly multi-disciplinary approach which includes elements of structures, materials, dynamics, control, design and inspiration taken from biological systems. Development of adaptive structures has been taking place in a wide range of industrial applications, but is particularly advanced in the aerospace and space technology sector with morphing wings, deployable space structures; piezoelectric devices and vibration control of tall buildings. Bringing together some of the foremost world experts in adaptive structures, this unique text: includes discussions of the application of adaptive structures in the aerospace, military, civil engineering structures, automotive and MEMS. presents the impact of biological inspiration in designing adaptive structures, particularly the use of hierarchy in nature, which typically induces multi-functional behavior. sets the agenda for future research in adaptive structures in one distinctive single volume. Adaptive Structures: Engineering Applications is essential reading for engineers and scientists working in the fields of intelligent materials, structural vibration, control and related smart technologies. It will also be of interest to senior undergraduate and postgraduate research students as well as design engineers working in the aerospace, mechanical, electrical and civil engineering sectors.

Author Biography

The Editors are from the Departments of Aerospace and Mechanical Engineering at the University of Bristol. Friswell is the Sir George White Professor of Aerospace Engineering and currently a Royal Society-Wolfson Research Merit Award Holder.  Bond, Drinkwater, Wagg and Weaver are all currently EPSRC Advanced Research Fellows. The editors have significant publication records in areas related to adaptive structures, which can be viewed from here: http://www.men.bris.ac.uk/ and http://www.aer.bris.ac.uk/. They are all involved in a significant amount of funded research projects (see http://www.epsrc.ac.uk/) – for example the new Bristol Laboratories for Advanced Dynamic Engineering (BLADE) funded by a recent £15 million JIF award (GR/R51261/01) as well as numerous other research projects funded by the EPRSC and industry. Inman is the George R. Goodson Professor of Mechanical Engineering, and Director of the Center for Intelligent Material Systems and Structures at Virginia Tech, USA. He is also the Benjamin Meaker Visiting Professor at Bristol.

Table of Contents

List of Contributors

Preface

Adaptive Structures for Structural Health Monitoring

Introduction

Structural Health Monitoring

Impedance-Based Health Monitoring

Local Computing

Power Analysis

Experimental Validation

Harvesting, Storage and Power Management

Autonomous Self-healing

The Way Forward: Autonomic Structural Systems for Threat Mitigation

Summary

Acknowledgements

References

Distributed Sensing for Active Control

Introduction

Description of Experimental Test Bed

Disturbance Estimation

Sensor Selection

Conclusions

Acknowledgments

References

Global Vibration Control Through Local Feedback

Introduction

Centralised Control of Vibration

Decentralised Control of Vibration

Control of Vibration on Structures with Distributed Excitation

Local Control in the Inner Ear

Conclusions

Acknowledgements

References

Lightweight Shape-Adaptable Airfoils: A New Challenge for an Old Dream

Introduction

Otto Lilienthal and the Flying Machine as a Shape-Adaptable Structural System

Sir George Cayley and the Task Separation Principle

Being Lightweight: A Crucial Requirement

Coupling Mechanism and Structure: Compliant Systems as the Basis of Lightweight Shape-Adaptable Systems

Extending Coupling to the Actuator System: Compliant Active Systems

A Powerful Distributed Actuator: Aerodynamics

The Common Denominator: Mechanical Coupling

Concluding Remarks

Acknowledgements

References

Adaptive Aeroelastic Structures

Introduction

Adaptive Internal Structures

Adaptive Stiffness Attachments

Conclusions

The Way Forward

Acknowledgements

References

Adaptive Aerospace Structures with Smart Technologies - A Retrospective and Future View

Introduction

The Past Two Decades

Added Value to the System

Potential for the Future

A Reflective Summary with Conclusions

References

A Summary of Several Studies with Unsymmetric Laminates

Introduction and Background

Room-Temperature Shapes of Square [02/902]T Cross-Ply Laminates

Room-Temperature Shapes of More General Unsymmetric Laminates

Moments Required to Change Shapes of Unsymmetric Laminates

Use of Shape Memory Alloy for Actuation

Use of Piezoceramic Actuation

Consideration of Small Piezoceramic Actuators

Conclusions

References

Negative Stiffness and Negative Poisson's Ratio in Materials which Undergo a Phase Transformation

Introduction

Experimental Methods

Composites

Polycrystals

Discussion

References

Recent Advances in Self-Healing Materials Systems

Introduction

Faster Healing Systems - Fatigue Loading

Smaller Size Scales

Alternative Materials Systems - Elastomers

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