Book description
Structural Health Monitoring with Piezoelectric Wafer Active Sensors, Second Edition provides an authoritative theoretical and experimental guide to this fastpaced, interdisciplinary area with exciting applications across a range of industries.
The book begins with a detailed yet digestible consolidation of the fundamental theory relating to structural health monitoring (SHM). Coverage of fracture and failure basics, relevant piezoelectric material properties, vibration modes in different structures, and different wave types provide all the background needed to understand SHM and apply it to realworld structural challenges. Moving from theory to experimental practice, the book then provides the most comprehensive coverage available on using piezoelectric wafer active sensors (PWAS) to detect and quantify damage in structures.
Updates to this edition include circular and straightcrested Lamb waves from first principle, and the interaction between PWAS and Lamb waves in 1D and 2D geometries. Effective shear stress is described, and tuning expressions between PWAS and Lamb waves has been extended to cover axisymmetric geometries with a complete Hankeltransformbased derivation.
New chapters have been added including handson SHM case studies of PWAS stress, strain, vibration, and wave sensing applications, along with new sections covering essential aspects of vibration and wave propagation in axisymmetric geometries.
 Comprehensive coverage of underlying theory such as piezoelectricity, vibration, and wave propagation alongside experimental techniques
 Includes stepbystep guidance on the use of piezoelectric wafer active sensors (PWAS) to detect and quantify damage in structures, including clear information on how to interpret sensor signal patterns
 Updates to this edition include a new chapter on composites and new sections on advances in vibration and wave theory, bringing this established reference in line with the cutting edge in this emerging area
Table of contents
 Cover image
 Title page
 Copyright
 Dedication
 Preface
 Chapter 1. Introduction
 Chapter 2. Electroactive and Magnetoactive Materials

Chapter 3. Vibration Fundamentals
 3.1 Introduction
 3.2 Single Degree of Freedom Vibration Analysis
 3.3 Axial Vibration of a Bar
 3.4 Flexural Vibration of a Beam
 3.5 Torsional Vibration of a Shaft
 3.6 ShearHorizontal (SH) Vibration of an Elastic Strip
 3.7 ShearVertical (SV) Vibration of a Beam
 3.8 Summary and Conclusions
 3.9 Problems and Exercises
 References
 Chapter 4. Vibration of Plates

Chapter 5. Elastic Waves
 5.1 Introduction
 5.2 Overview of Elastic Wave Propagation in Solids and Structures
 5.3 Axial Waves in a Bar
 5.4 Flexural Waves in a Beam
 5.5 Torsional Waves in a Shaft
 5.6 ShearHorizontal (SH) waves in a Strip
 5.7 ShearVertical (SV) Waves in a Beam
 5.8 Plate Waves
 5.9 Plane, Spherical, and Circular Wave Fronts
 5.10 Bulk Waves in an Infinite Elastic Medium
 5.11 Summary and Conclusions
 5.12 Problems and Exercises
 References
 Chapter 6. Guided Waves

Chapter 7. Piezoelectric Wafer Active Sensors – PWAS Transducers
 7.1 Introduction
 7.2 PWAS Actuators
 7.3 PWAS Stress and Strain Sensors
 7.4 Thickness Effects on PWAS Excitation and Sensing
 7.5 Vibration Sensing with PWAS Transducers
 7.6 Wave Sensing with PWAS Transducers
 7.7 Installation and Quality Check of PWAS Transducers
 7.8 Durability and Survivability of Piezoelectric Wafer Active Sensors
 7.9 Typical Use of PWAS Transducers in SHM Applications
 7.10 Summary and Conclusions
 7.11 Problems and Exercises
 References
 Chapter 8. Coupling of PWAS Transducers to the Monitored Structure
 Chapter 9. PWAS Resonators
 Chapter 10. HighFrequency Vibration SHM with PWAS Modal Sensors – the Electromechanical Impedance Method

Chapter 11. Wave Tuning with Piezoelectric Wafer Active Sensors
 11.1 Introduction
 11.2 Axial Wave Tuning with PWAS Transducers
 11.3 Flexural Wave Tuning with PWAS Transducers
 11.4 Lamb Wave Tuning with 1D PWAS Transducers
 11.5 Lamb Wave Tuning with Circular PWAS Transducers
 11.6 Hankel Transform for Circular PWAS Tuning Analysis
 11.7 Experimental Validation of PWAS Lamb Wave Tuning
 11.8 Directivity of Rectangular PWAS
 11.9 Summary and Conclusions
 11.10 Problems and Exercises
 References

Chapter 12. Wave Propagation SHM with PWAS Transducers
 12.1 Introduction
 12.2 1D Modeling and Experiments
 12.3 2D PWAS Wave Propagation Experiments
 12.4 Embedded PitchCatch Ultrasonics with PWAS transducers
 12.5 Embedded PulseEcho Ultrasonics with PWAS Transducers
 12.6 PWAS TimeReversal Method
 12.7 The Migration Technique
 12.8 PWAS Passive Sensors of Acoustic Waves
 12.9 Summary and Conclusions
 12.10 Problems and Exercises
 References

Chapter 13. In Situ Phased Arrays with Piezoelectric Wafer Active Sensors
 13.1 Introduction
 13.2 Phased Arrays in Conventional Ultrasonic NDE
 13.3 1D Linear PWAS Phased Arrays
 13.4 Further Experiments with Linear PWAS Arrays
 13.5 Optimization of PWAS PhasedArray Beamforming
 13.6 Generic PWAS PhasedArray Formulation
 13.7 2D Planar PWAS PhasedArray Studies
 13.8 The 2D Embedded Ultrasonics StructuralRadar(2DEUSR)
 13.9 Damage Detection Experiments Using RectangularPWAS Arrays
 13.10 Phased Array Analysis Using Fourier Transform
 13.11 Summary and Conclusions
 13.12 Problems and Exercises
 References

Chapter 14. Signal Processing and Pattern Recognition for Structural Health Monitoring with PWAS Transducers
 14.1 Introduction
 14.2 Damage Identification Concepts and Approaches
 14.3 From Fourier Transform to ShortTime Fourier Transform
 14.4 Wavelet Analysis
 14.5 Neural Nets
 14.6 Feature Extraction
 14.7 Algorithm for PWAS Damage Detection with the E/M Impedance Method
 14.8 Summary and Conclusions
 14.9 Problems and Exercises
 References
 Chapter 15. Case Studies of MultiMethod SHM with PWAS Transducers: Damage ID in Experimental Signals
 Appendix A. Mathematical Prerequisites

Appendix B. Elasticity Notations and Equations
 B.1 Basic Notations
 B.2 3–D StrainDisplacement Relations
 B.3 Dilatation and Rotation
 B.4 3D StressStrain Relations in Engineering Constants
 B.5 3D StressStrain Relations in Lamé Constants
 B.6 3D StressDisplacement Relations
 B.7 3D Equations of Motion
 B.8 3D Governing Equations–NavierLamé Equations
 B.9 Tractions
 B.10 Boundary Conditions
 B.11 2D Elasticity
 B.12 PlaneStress Elasticity in Polar Coordinates
 B.13 Cylindrical Coordinates
 B.14 Axisymmetric Polar and Cylindrical Coordinates
 B.15 Spherical Coordinates
 References
 Index
Product information
 Title: Structural Health Monitoring with Piezoelectric Wafer Active Sensors, 2nd Edition
 Author(s):
 Release date: June 2014
 Publisher(s): Academic Press
 ISBN: 9780124201026
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