Smart Technologies for Safety Engineering (eBook)

This book presents the research results obtained over the last decade by the Smart Technology Centre (STC), href="http://smart.ippt.gov.pl/">http://smart.ippt.gov.pl/, operating at the Institute of Fundamental Technological research (IPPT) of the Polish Academy of Sciences (PAN), Warsaw, Poland. It collects achievements of several PhD theses, already completed or still being elaborated. the STC is a division of IPPT-PAN, headed by Prof. Jan Holnicki-Szulc. He graduated from the Warsaw University of Technology in civil Engineering (1969) and simultaneously from the University of Warsaw in Mathematics (1972). Hs PhD thesis (1973) and the habilitation thesis (1983) were defended in IPPT. He spent about 5 years (in the 1980s and 1990s) visiting various labs became eligible for financial support through the European research initiatives, i.e. the 4th, 5th and 6th Framework Programmes. The first PhD thesis in the STC was defended by Przemystaw Kotakowski (1998) and devoted to the application of the virtual distortion method (VDM) to optimal structural remodeling, treated as a static problem. Then, one of the next these by Tomasz G. Zielinski (2003) contained a generalization of the VDM for structural dynamics and its application to damage identification via the solution of an inverse problem. Anita Ortowska (2007) in her thesis developed an application of the dynamic VDM to the identification of delamination in composite beams. Further development of these numerical tools, allowing for fast and effective structural remodeling and solving coupled dynamic problems (including redistribution of material, stiffness and physical nonlinearity), was done by Marcin Wikto (thesis just completed). Dr Lukasz Jankowski (PhD defended in BAM, Berlin) and Dr Barttomiej Btachowski (PhD defended in IPPT-PAN, Warsaw) joined the STC in 2005 and ar4e both involved in dynamic load identification. The further development of VDM applications to the structural health monitoring (SHM) concepts and under development in collaboration with the current PhD students Andrzej Swiercz and Marek Kokot (Theses almost completed). Matgorzata Mroz (thesis in progress) is working on the application of the VDM to optimal remodeling of damping properties in dynamically excited structures. Another group of PhD students, Grzegorz Mikutowski and Piotr Pawtowski (theses almost completed), Cezary Graczykowski and Krzysztof Sekuta (theses in progress), Arkadiusz Mroz and Marian Ostrowski (theses in progress), have already obtained interesting research results in the field of adaptive impact absorption (AIA). Finally, Dr Jerzy Motylewski is a key person in the STC in vibroacoust6ic measurement techniques and hardware development. The team of seventeen co-authors is presented below; their contributions to particular chapters are listed in the Organization of the Book.

Preface

About the Authors

Organization of the Book



1 Introduction to Smart Technologies

Jan Holnicki-Szulc, Jerzy Motylewski and Przemyslaw Kolakowski

1.1 Smart Technologies - 30 Years of History

1.2 Smart-Tech Hardware Issues

1.3 Smart-Tech Software Issues

References



2 The Virtual Distortion Method-A Versatile Reanalysis Tool

Przemyslaw Kolakowski, Marcin Wiklo and Jan Holnicki-Szulc

2.1 Introduction

2.2 Overview of Reanalysis Methods

2.3 Virtual Distortion Method - The Main Idea

2.4 VDM in Structural Statics

2.5 VDM in Structural Dynamics

2.6 VDM-Based Sensitivity Analysis

2.7 Versatility of VDM in System Modeling

2.8 Recapitulation

References



3 VDM-Based Health Monitoring of Engineering Systems

Przemyslaw Kolakowski, Andrzej Swiercz, Anita Orlowska, Marek Kokot and Jan Holnicki-Szulc

3.1 Introduction to Structural Health Monitoring

3.2 Damage Identification in Skeletal Structures

3.3 Modeling and Identification of Delamination in Double-Layer Beams

3.4 Leakage Identification in Water Networks

3.5 Damage identification in Electrical Circuits

References



4 Dynamic Load Monitoring

Lukasz Jankowski, Krzysztof Sekula, Bartlomiej D. Blachowski,Marcin Wiklo,and Jan Holnicki-Szulc

4.1 Real-Time Dynamic Load Identification

4.2 Observer Technique for On-Line Load Monitoring

4.3 Off-Line Identification of Dynamic Loads

References



5 Adaptive Impact Absorption

Piotr K. Pawlowski, Grzegorz Mikulowski, Cezary Graczykowski, Marian Ostrowski, Lukasz Jankowski and Jan Holnicki-Szulc

5.1 Introduction

5.2 Multifolding Materials and Structures

5.3 Structural Fuses for Smooth Reception of Repetitive Impact Loads

5.4 Absorption of Repetitive, Exploitative Impact Loads in Adaptive Landing Gears

5.5 Adaptive Inflatable Structures with Controlled Release of Pressure

5.6 Adaptive Crash Energy Absorber

References



6 VDM-Based Remodeling of Adaptive Structures Exposed to Impact Loads

Marcin Wiklo, Lukasz Jankowski, Malgorzata Mr´oz and Jan Holnicki-Szulc

6.1 Material Redistribution in Elastic Structures

6.2 Remodeling of Elastoplastic Structures

6.3 Adaptive Structures with Active Elements

6.4 Remodeling of Damped Elastic Structures

References



7 Adaptive Damping of Vibration by the Pre-stress Accumulation Release Strategy

Arkadiusz Mr´oz, Anita Orlowska and Jan Holnicki-Szulc

7.1 Introduction

7.2 Mass-Spring System

7.3 Delamination of a Layered Beam

7.4 Experimental Verification

7.5 Possible Applications

References



8 Modeling and Analysis of Smart Technologies in Vibroacoustics

Tomasz G. Zielinski

8.1 Introduction

8.2 Biot's Theory of Poroelasticity

8.3 Porous and Poroelastic Material Data and Coefficients

8.4 Weak Forms of Poroelasticity, Elasticity, Piezoelectricity and Acoustics

8.5 Boundary Conditions for Poroelastic Medium

8.6 Interface Coupling Conditions for Poroelastic and Other Media

8.7 Galerkin Finite Element Model of a Coupled System of Piezoelectric, Elastic, Poroelastic and Acoustic Media

8.8 Modeling of Poroelastic Layers with Mass Implants Improving Acoustic Absorption

8.9 Designs of Active Elastoporoelastic Panels

8.10 Modeling and Analysis of an Active Single-Plate Panel

References



Acknowledgments

Index