Virtual Distortion Method

Virtual Distortion Method

The objective of this book is to present a general concept of the Virtual Distortion Method with the necessary theoretical background and a variety of its applications to problems of structural analysis and design.

Author: Jan Holnicki-Szulc

Publisher: Springer Science & Business Media

ISBN: 9783642844539

Category: Science

Page: 176

View: 505

The theory of virtual distortions provides an efficient tool which can be used to treat many problems that differ from the physical point of view. The objective of this book is to present a general concept of the Virtual Distortion Method with the necessary theoretical background and a variety of its applications to problems of structural analysis and design. The book is focussed more on theoretical aspects of the problems than on the practical design of structurÄB. Nevertheless, a number of numerical algorithms discussed in the book has already been developed as a computational system capable to solve various problems of structural analysis.
Categories: Science

Structural Analysis Design and Control by the Virtual Distortion Method

Structural Analysis  Design and Control by the Virtual Distortion Method

This book presents the general concept of the Virtual Distortion Method with the necessary theoretical background and a number of its applications to problems of structural analysis and design.

Author: Jan Holnicki-Szulc

Publisher: Wiley

ISBN: 0471956562

Category: Science

Page: 318

View: 248

This book presents the general concept of the Virtual Distortion Method with the necessary theoretical background and a number of its applications to problems of structural analysis and design. The approach presented allows for the development of efficient computational methods for the numerical analysis of problems where, e.g., local failures, the temperature field or permanent plastic deformations are described by virtual distortions. On the other hand, properly modelled (fictitious) virtual distortions can be used to simulate structural modifications such as material redistribution applicable in the optimal redesign process. Finally, virtual distortions can be used to mimic the behaviour of actuators in active structural control problems: shape, stress or vibration control. A number of numerical algorithms are developed, enabling one to solve various problems of structural analysis, design and control.
Categories: Science

Structural Health Monitoring 2006

Structural Health Monitoring 2006

METHODS As the basis for developing a methodology for damage identification we selected the static Virtual Distortion Method . The original VDM , which belongs to fast reanalysis techniques , ( cf. [ 1 ] ) is described in depth in [ 2 ] ...

Author: Alfredo Güemes

Publisher: DEStech Publications, Inc

ISBN: 1932078630

Category: Technology & Engineering

Page: 1434

View: 617

TABLE OF CONTENTS Preface KEYNOTE PRESENTATIONS · New Technology Frontiers on Commercial Aircrafts · A New Look in Design of Intelligent Structures with SHM · The Multidisciplinary Approach to SHM · The Challenge of Long-Span Suspended Bridges · Towards Damage and Structural Health Monitoring of Aerospace Composite Structures using Optical Fiber Sensors MONITORING OF CIVIL STRUCTURES · Life-Cycle Assessment and Life Extension of Structures via Innovative Methods · Framework for the Optimization of Structural Health Monitoring on a Probabilistic Basis · Experimental Validation of Life Time Assessment of Existing Bridges by Means of Monitoring and Testing · Monitoring, Adaptive and Probabilistic Modelling of Chloride Ingress in Concrete Structures · Monitoring of Emissions and Mechanical Stability of Landfills · Modelling of Long-Term Landfill Behaviour · Novel Sensor Systems for Structural Health Monitoring · Structural Health Monitoring by In-Situ Materials Analysis · Monitoring of Tension Members of Civil Structures—New Concepts and Testing · Damage Evaluation and Crack Detection in Steel Structures using Lockin-Thermography · Detection of Structural Changes by Means of Piezo Discs · Life Cycle Assessment of Welded Components with Help of Nondestructive Testing Methods AEROSPACE APPLICATIONS · An Overview of the FLPP Technology Developments in Structures Health Monitoring for the European Next Generation Launcher · Damage Detection on Aerospace Structures: Last Developments at EADS · Flight Demonstration: Health Monitoring for Bonded Structural Repairs · Implementation of an Experimental System for Structural Health Monitoring in a Turboprop Commercial Aircraft · Structure Condition Monitoring with Passive Tags · Procedures for the Assessment of Structural Health Monitoring Potentials · Evaluation of Crack and Corrosion Detection Sensitivity using Piezoelectric Sensor Arrays · A High Resolution Health Monitoring System for Bonded Composite Repairs using a Spatially Sparse Fiber Bragg Grating Sensor Net · A Development and Application Test of Brillouin Scattering Sensing Method for Aircraft Structural Health Monitoring · Damage Growth Detection of Aircraft Bonding Structure under Cyclic Loading using FBG/PZT Hybrid Sensor System · SHM with Embedded Fibre Bragg Gratings and Piezoelectric Devices · Monitoring of Interfacial Crack Growth of Stiffened Panel with Embedded Fiber Bragg Grating Sensors · Advanced Phased Array System for Structural Damage Detection · Nonlinear Vibro-Acoustic Modulation Technique for Life Prediction of Aging Aircraft Components · Global Crack Detection for Aircraft Monitoring using Bispectral Analysis · Evaluation of Impact Tests on the TANGO Barrel by Means of Fibre Bragg Grating Sensor (FBGS) Measurements · Ultrasonic Wave Modulations for Damage Detection in Metallic Structures · Characterization and Modeling of Bonded Piezoelectric Sensor Performance and Durability in Simulated Aircraft Environments ARTIMA · ARTIMA: Aircraft Reliability Through Intelligent Materials Applications · Damage Detection in Plates using Transducers Mounted on Viscoelastic Damping Layers · Experimental Investigation of Elastic Waves Propagation 1D and 2D Structures with Faults · Elastic Wave Propagation in a Cracked Isotropic Plate · Comparison of Health Monitoring Systems with Fiber Bragg Grating and Piezoelectric Sensors · Rotor Blade Integrated Sensor for Monitoring of BVI Caused Pressures Fluctuations SHM APPLICATIONS TO BRIDGES · Structural Health Monitoring of a Steel Railway Bridge using Optical Fibre Bragg Grating Sensors and Numerical Simulation · Computational Validation of a Forced-Vibration Method for Structural Health Monitoring of Large-Scale Structures · Bridge Health Monitoring for Egnatia Odos Bridge Management System · Analysis of Structural Health Monitoring Data from the Suspension Jiangyin Bridge · The Long Term Structural Health Monitoring of Bridges in the State of Connecticut · Data Processing for Safety Control of Birdges in Real Time SHM APPLICATIONS TO BUILDINGS · Networked Health Monitoring System for Buildings and its Data Model · Experimental Validation of a Technique for Seismic Damage Identification in Buildings · Experimental Study on Localization and Quantification of Structural Damage using ZigBee Motes · Structural Damage Detection using a Time Windowing Technique from Measured Acceleration during Earthquake · Identifying Damage in the ASCE Benchmark Structure using a Neural-Wavelet Module · Distributed-Cooperative Problem Solving in SHM using Multi-Level Intelligence SHM APPLICATIONS IN CIVIL ENGINEERING · Recent Structural Health Monitoring Applications in Italy · Monitoring Temperature and Water Imbibition in Litic Materials by Embedded FBG · Early Damage Detection System for Tower and Rotor Blades of Offshore Wind Turbines · Monitoring the Disbond of Externally Bonded CFRP Composite Strips for Rehabilitation of Bridges · Advances in Manufacture of Smart Prestressed Reinforced Concrete Elements · Long Base Optical Fiber Extensometers Sense Structural Geometrical Nonlinearities DAMAGE DETECTION ALGORITHMS · Damage Localization in a Stiffened Structure-Comparison of Different Methods · Handling the Temperature Effect in SHM: Combining a Subspace Based Statistical Test and a Temperature-Adjusted Null Space · Transient Statistical Energy Analysis Applied to Damage Detection · Nonlinear Model Updating Based on System Augmentation for Nonlinear Damage Detection · Damage Identification of Cables via Virtual Distortion Method · Stiffness Matrix Estimation via Differential Evolution Algorithm · Embedding SHM Algorithms into a Microcontroller for Real-Time and Fully-Automated Civil Applications · Damage Identification using Curvatures and Sensitivities of Frequency-Response-Functions · An Enhanced Principal Component Analysis for Structural Health Monitoring · Damage Identification Inverse Problem for a Piezoelectric Material · A Negative Selection Approach to Novelty Detection in a Changing Environment · Vibration-Based Fault Detection and Assessment in a Scale Aircraft Structure via Stochastic VFP-ARX Models · A Roughness Index for Detecting Damage in Plates · Inverse Problem Filtering for Noise Reduction in QNDE · Multivariate Statistics Process Control for Dimensionality Reduction on Structural Health Monitoring · Diagnostic System of Cylindrical Shell Based on Experimental Modes and Wavelet Analysis · Online Force Reconstruction using Robust Observers · Use of Bispectral Analysis in Condition Monitoring of Machinery · Removing Non-Linear Environmental Influences from Structural Features · Quantification of Uncertainty in Damage Detection Techniques · Damage Detection in Structures and Control Systems using Realization Redundancy and Outlier Analysis · Defects Identification in Rods via the Wavelet Transform of Transient Vibrations · Design of Experiments based Variability Analysis of Damage Detection Methods in Structural Components · A Posteriori Impact Identification · Feature Selection for a Neural Network Damage Diagnostic using a Genetic Algorithm · Sequential LS-SVM for Structural System Identification · Time Series Methods for Fault Detection and Identification in Vibrating Structures · Monitoring of Delamination Defects in Composite Beams · Identification of Stiffness Variation in Structural Systems by Modified Littlewood-Paley Wavelets · A Neural Network Based Health Monitoring Methodology for Co-Cured/Co-Bonded Composite Aircraft Structures · Crack Identification in the Complex Beam-Type Structures Based on Frequency Data DAMAGE DETECTION EXPERIMENTAL METHODS · Simulation Based Health Assessment of Engineering Structures · Thermal Damage Identification in Metallic Honeycomb Thermal Protection System Panels using Active Distributed Sensing with the Method of Virtual Forces · Merging Sensor Data from Multiple Temperature Scenarios for Vibration-Based Monitoring of Civil Structures · Development of a Non-Contact Defect Detection System for Railroad Tracks for the US Federal Railroad Administration · Detection of Damages in Beams and Composite Plates by Harmonic Excitation and Time-Frequency Analysis · Reliability Study of Thermocouple Array Instrumented on a Titanium Plate using Modal Impacts and Piezo Actuation · Modal Analysis and Damage Detection by Fiber Bragg Grating Sensors · Active Sensing for Disbond Detection in CFRP Strengthened RC Beam · Advanced Self-Sufficient Structural Health Monitoring System · Damage Detection Based on Structural Stiffness and Experimental Verification · An Acoustic Emission Based SHM Technique for Aircraft Applications · Detection and Characterization of High-Velocity Impact Damage in Composite Laminates using PVDF Sensor Signals · Experimental Impact Force Identification of Composite Structures · 2D Layerwise Modeling of High-Frequency Modal Response in Delaminated Composite Beams with Active Piezoelectric Sensors · Wavelet-Based Analysis of Concentrically Braced Frames Subjected to Seismic Loading · Real Time Dynamic Mass Identification · Processing Effects and Structural Integrity of Fabric Reinforced Thin-Walled Composite Components · Compressive Properties of Polymer Laminates Containing Internal Sensor Cavities FIBRE OPTIC SENSORS · Fibre Optic Sensors for Lamb Wave Detection · Carbon Nanotubes-Based Optical Sensor for Hydrogen Detection at Cryogenic Temperature · Structural Health Monitoring System for Detecting Impact Events and Acoustic Emissions · Structural Health Monitoring of Bonded Composite Repairs using Embedded Fiber Bragg Grating Sensors and Neural Networks · 1932078592\\TABLE OF CONTENTS
Categories: Technology & Engineering

Smart Technologies for Safety Engineering

Smart Technologies for Safety Engineering

P. Ko'l'akowski and J. Holnicki-Szulc, Sensitivity analysis of truss structures — virtual distortion method approach. International Journal of Numerical Methods in Engineering 43(6), 1998, 1085— 1 108. J .T. Putresza and P. Ko'lakowski, ...

Author: Jan Holnicki-Szulc

Publisher: John Wiley & Sons

ISBN: 0470758600

Category: Technology & Engineering

Page: 350

View: 604

Smart technologies comprise a dynamic new interdisciplinary research field that encompasses a wide spectrum of engineering applications including, but not limited to, intelligent structures and materials, actuators, sensors and structural observability, control systems and software tools for the design of adaptive structures. Smart technologies focus on the issues surrounding the safety and integrity of engineering systems. Smart Technologies for Safety Engineering presents the achievements of ten years of research from the Smart-Tech Centre applied to some of the key issues of safety engineering. Results presented include: Original methods and software tools for modelling, design, simulation and control of adaptive structures and applicability of the adaptive concept to the design of structures for extreme loads; Application of the smart-tech concept to hot research topics and emerging engineering issues including health monitoring of structures and engineering systems, monitoring of loading conditions, automatic structural adaptation to unpredictable, randomly changing dynamic conditions and the optimal design of adaptive structures and engineering systems; Numerically efficient and original software packages that can be used for the design of adaptive, as well as passive (without control devices) structures. The Virtual Distortion Method, which has been developed especially for fast reanalysis of structures and systems and exact sensitivity analysis, allowing for effective modelling, design, health monitoring and control of smart engineering systems. The original research and practical applications in Smart Technologies for Safety Engineering will appeal to a broad spectrum of engineers, researchers, professors and graduate students involved in the research, design and development of widely understood adaptronics and mechatronics, including smart structures and materials, adaptive impact absorption, health and load monitoring, vibration control, vibroacoustics and related issues.
Categories: Technology & Engineering

Artificial Intelligence and Security

Artificial Intelligence and Security

Hence, in the depth map coding process, the virtual view can be generated by the virtual view synthesis technology to obtain the real virtual view distortion. The calculation method of the synthesized view-based RDO method for depth map ...

Author: Xingming Sun

Publisher: Springer Nature

ISBN: 9783030578848

Category: Computers

Page: 828

View: 633

This two-volume set LNCS 12239-12240 constitutes the refereed proceedings of the 6th International Conference on Artificial Intelligence and Security, ICAIS 2020, which was held in Hohhot, China, in July 2020. The conference was formerly called “International Conference on Cloud Computing and Security” with the acronym ICCCS. The total of 142 full papers presented in this two-volume proceedings was carefully reviewed and selected from 1064 submissions. The papers were organized in topical sections as follows: Part I: Artificial intelligence and internet of things. Part II: Internet of things, information security, big data and cloud computing, and information processing.
Categories: Computers

Echinoderms Munchen

Echinoderms  Munchen

This numerically economical method 3 VIRTUAL DISTORTION IN FREQUENCY can be addressed to problems , where steady - state DOMAIN response can be the basis of dynamic analysis . For example , the following tasks can be solved on the From ...

Author: Thomas Heinzeller

Publisher: CRC Press

ISBN: 0415390370

Category: Science

Page: 664

View: 179

Since 1972, scientists from all over the world working on fundamental questions of echinoderm biology and palaeontology have conferred every three years to exchange current views and results. The 11th International Echinoderm Conference held at the University of Munich, Germany, from 6-10 October 2003,continued this tradition. This volume comprises 95 submitted papers and 96 abstracts covering a wide spectrum from innovative student contributions to the lessons learnt from experienced specialists. The content of the contributions ranges from original research results to the latest synopses concerning a variety of topics, including visual sensing, larval cloning, mutable collagenous tissues, sea urchin aqua-culture, deuterostome phylogeny, palaeobiology and taphonomy.
Categories: Science

Smart Sensors for Structural Health Monitoring

Smart Sensors for Structural Health Monitoring

Virtual. Masses. for. Structural. Damage. Identification. Jilin Hou 1,*, Zhenkun Li1, Qingxia Zhang2, Runfang Zhou1,3 and Łukasz Jankowski 4 1 ... The influence of a virtual mass can be expressed by Virtual Distortion Method (VDM) using ...

Author: Simon Laflamme

Publisher: MDPI

ISBN: 9783039217588

Category: Technology & Engineering

Page: 342

View: 934

Smart sensors are technologies designed to facilitate the monitoring operations. For instance, power consumption can be minimized through on-board processing and smart interrogation algorithms, and state detection enhanced through collaboration between sensor nodes. Applied to structural health monitoring, smart sensors are key enablers of sparse and dense sensor networks capable of monitoring full-scale structures and components. They are also critical in empowering operators with decision making capabilities. The objective of this Special Issue is to generate discussions on the latest advances in research on smart sensing technologies for structural health monitoring applications, with a focus on decision-enabling systems. This Special Issue covers a wide range of related topics such as innovative sensors and sensing technologies for crack, displacement, and sudden event monitoring, sensor optimization, and novel sensor data processing algorithms for damage and defect detection, operational modal analysis, and system identification of a wide variety of structures (bridges, transmission line towers, high-speed trains, masonry light houses, etc.).
Categories: Technology & Engineering

Reliability and Optimization of Structural Systems 88

Reliability and Optimization of Structural Systems    88

The equations (11) and (12) constitute the fundamental set of equations of the virtual distortion method. Solution of these equations provides the virtual distortions ?, which, when substituted into (6) and (7) define the state SM of ...

Author: P. Thoft-Christensen

Publisher: Springer Science & Business Media

ISBN: 9783642838286

Category: Technology & Engineering

Page: 434

View: 681

The present book contains 30 papers presented at the 2nd Working Conference on Reliability and Optimization of Structural Systems. The purpose of the Working Group was - to promote modern structural system optimization and reliability theory, - to advance international cooperation in the field of structural system optimization and reliability theory, - to stimulate research, development and application of structural system optimization and reliability theory, - to further the dissemination and exchange of information on reliability and optimization of structural system optimization and reliability theory, - to encourage education in structural system optimization and reliability theory.
Categories: Technology & Engineering

Fifth European Workshop on Structural Health Monitoring 2010

Fifth European Workshop on Structural Health Monitoring 2010

SYSTEM IMPULSE RESPONSE VIA THE VDM The Virtual Distortion Method is a quick reanalysis method. Structural damages are modeled by the related response-coupled virtual distortions or virtual forces. Then, the responses of the damaged ...

Author: Fabio Casciati

Publisher: DEStech Publications, Inc

ISBN: 9781605950242

Category: Technology & Engineering

Page: 1393

View: 356

Categories: Technology & Engineering

Applied Mechanics Reviews

Applied Mechanics Reviews

mined in the calculation ; in cylinders with 16 stringers it extends , the virtual deflection pattern , is zero . ... done by the external forces due to This condition is handled by the Lagrange multiplier method . the distortion to the ...

Author:

Publisher:

ISBN: STANFORD:36105013125245

Category: Mechanics, Applied

Page:

View: 637

Categories: Mechanics, Applied