Download or read book Identification of Structural Systems from Measured Response written by Mohammad Reza Banan and published by . This book was released on 19?? with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research study presents an approach to the problem of parameter estimation of finite element models of complex structural systems using measured response. The developed method computes the element, constitutive parameters of a finite element model of a structure by finding a constrained nonlinear minimum of the difference between the measured response of the real structure and the computed response of a finite element model of the structure. Constraints are used to bound the constitutive parameters. The proposed constrained nonlinear optimization problem is solved using a recursive quadratic programming (RQP) method. The constructed recursive quadratic programming algorithm is an attractive local optimization method that applies directly to problems with inequality as well as equality constraints, it is globally convergent, and it is amenable to large-scale computation. The RQP method is an iterative gradient search method that needs the gradient and Hessian of the loss function with respect to the unknown variables. A simple and straightforward method is developed to compute these sensitivities of the loss function with respect to the unknown variables. All the computations are in the element level. The method presented herein has been implemented as a general purpose parameter estimation program for structural systems. This program has all the flexibilities of a general purpose finite element package in that it can treat complex structures with different topologies, geometries and element types. It is suited to static, modal dynamic, or forced dynamic response, sparsely sampled in space, time, and state. It has a grouping scheme for considering the elements with the same constitutive parameters. Another feature of the developed package is to implement a priori knowledge about some of the constitutive parameters. Furthermore, it has strategies to compute initial values of the unknown variables for starting the iteration. Monte Carlo simulation is used to study the behavior of the developed parameter estimation method in the presence of noise in measurements. Extensive simulations are carried out for both the static and force dynamic cases. A case study, using real field measurements is presented for the modal dynamic case.

Download or read book System Identification for Structural Health Monitoring written by Izuru Takewaki and published by WIT Press. This book was released on 2012 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: System identification (SI) techniques are important in reducing gaps between the constructed structural systems and their structural design models and in health monitoring for damage detection. Modal-parameter SI and physical-parameter SI are two major branches in SI.Special character of this book: (1) The physical-parameter SI method explained in this book requires only two accelerometers for measurement of records. Furthermore only a simple manipulation of Fourier transformation is required.(2) The stiffness and damping can be identified simultaneously.(3) The modal parameter SI can supplement or support the result by the physical-parameter SI method.(4) In place of usual low-pass or high-pass filter techniques, a novel noise-bias compensation method is explained. Because the noise itself is not known in many cases, the identification and elimination of noise is a tough problem.(5) A new technique of system identification is explained in the case where an inner vibration source exists.(6) The accuracy of the explained SI methods is examined by the actual recorded data.(7) MATLAB codes are available.This book is intended for Structural Engineers, Mechanical Engineers, Researchers, Graduate and undergraduate students.

Download or read book Proceedings of the International Symposium on Engineering under Uncertainty Safety Assessment and Management ISEUSAM 2012 written by Subrata Chakraborty and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 1322 pages. Available in PDF, EPUB and Kindle. Book excerpt: International Symposium on Engineering under Uncertainty: Safety Assessment and Management (ISEUSAM - 2012) is organized by Bengal Engineering and Science University, India during the first week of January 2012 at Kolkata. The primary aim of ISEUSAM 2012 is to provide a platform to facilitate the discussion for a better understanding and management of uncertainty and risk, encompassing various aspects of safety and reliability of engineering systems. The conference received an overwhelming response from national as well as international scholars, experts and delegates from different parts of the world. Papers received from authors of several countries including Australia, Canada, China, Germany, Italy, UAE, UK and USA, besides India. More than two hundred authors have shown their interest in the symposium. The Proceedings presents ninety two high quality papers which address issues of uncertainty encompassing various fields of engineering, i.e. uncertainty analysis and modelling, structural reliability, geotechnical engineering, vibration control, earthquake engineering, environmental engineering, stochastic dynamics, transportation system, system identification and damage assessment, and infrastructure engineering.

Download or read book Structural Identification of Constructed Systems written by and published by ASCE Press. This book was released on 2013-05 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents research in structural engineering that bridges the gap between models and real structures by developing more reliable estimates of the performance and vulnerability of existing structural systems.

Download or read book Identification of Structrual Systems from Measured Response written by Mohammad Reza Banan and published by . This book was released on 1994 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research study presents an approach to the problem of parameter estimation of finite element models of complex structural systems using measured response. The developed method computes the element, constitutive parameters of a finite element model of a structure by finding a constrained nonlinear minimum of the difference between the measured response of the real structure and the computed response of a finite element model of the structure. Constraints are used to bound the constitutive parameters. The proposed constrained nonlinear optimization problem is solved using a recursive quadratic programming (RQP) method. The constructed recursive quadratic programming algorithm is an attractive local optimization method that applies directly to problems with inequality as well as equality constraints, it is globally convergent, and it is amenable to large-scale computation. The RQP method is an iterative gradient search method that needs the gradient and Hessian of the loss function with respect to the unknown variables. A simple and straightforward method is developed to compute these sensitivities of the loss function with respect to the unknown variables. All the computations are in the element level. The method presented herein has been implemented as a general purpose parameter estimation program for structural systems. This program has all the flexibilities of a general purpose finite element package in that it can treat complex structures with different topologies, geometries and element types. It is suited to static, modal dynamic, or forced dynamic response, sparsely sampled in space, time, and state. It has a grouping scheme for considering the elements with the same constitutive parameters. Another feature of the developed package is to implement a priori knowledge about some of the constitutive parameters. Furthermore, it has strategies to compute initial values of the unknown variables for starting the iteration. Monte Carlo simulation is used to study the behavior of the developed parameter estimation method in the presence of noise in measurements. Extensive simulations are carried out for both the static and force dynamic cases. A case study, using real field measurements is presented for the modal dynamic case.

Download or read book Identification of Dynamic Systems written by Rolf Isermann and published by Springer Science & Business Media. This book was released on 2010-11-22 with total page 705 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precise dynamic models of processes are required for many applications, ranging from control engineering to the natural sciences and economics. Frequently, such precise models cannot be derived using theoretical considerations alone. Therefore, they must be determined experimentally. This book treats the determination of dynamic models based on measurements taken at the process, which is known as system identification or process identification. Both offline and online methods are presented, i.e. methods that post-process the measured data as well as methods that provide models during the measurement. The book is theory-oriented and application-oriented and most methods covered have been used successfully in practical applications for many different processes. Illustrative examples in this book with real measured data range from hydraulic and electric actuators up to combustion engines. Real experimental data is also provided on the Springer webpage, allowing readers to gather their first experience with the methods presented in this book. Among others, the book covers the following subjects: determination of the non-parametric frequency response, (fast) Fourier transform, correlation analysis, parameter estimation with a focus on the method of Least Squares and modifications, identification of time-variant processes, identification in closed-loop, identification of continuous time processes, and subspace methods. Some methods for nonlinear system identification are also considered, such as the Extended Kalman filter and neural networks. The different methods are compared by using a real three-mass oscillator process, a model of a drive train. For many identification methods, hints for the practical implementation and application are provided. The book is intended to meet the needs of students and practicing engineers working in research and development, design and manufacturing.

Download or read book Dynamics of Civil Structures Volume 2 written by Shamim Pakzad and published by Springer. This book was released on 2018-06-11 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamics of Civil Structures, Volume 2: Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics, 2018, the second volume of nine from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of the Dynamics of Civil Structures, including papers on: Modal Parameter Identification Dynamic Testing of Civil Structures Control of Human Induced Vibrations of Civil Structures Model Updating Damage Identification in Civil Infrastructure Bridge Dynamics Experimental Techniques for Civil Structures Hybrid Simulation of Civil Structures Vibration Control of Civil Structures System Identification of Civil Structures

Download or read book Health Assessment of Engineered Structures written by Achintya Haldar and published by World Scientific. This book was released on 2013 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers some of the most recent developments and application potentials in structural health assessment for non-experts in the subject. Among topics addressed are sensor types, platforms and data conditioning for practical applications, wireless collection of sensor data, sensor power needs and on-site energy harvesting, long-term monitoring of structures, uncertainty in collected data, and future directions in structural health assessment.

Download or read book Experimental and Applied Mechanics Volume 6 written by Nancy Sottos and published by Springer. This book was released on 2014-08-02 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental and Applied Mechanics, Volume 6: Proceedings of the 2014 Annual Conference on Experimental and Applied Mechanics, the sixth volume of eight from the Conference, brings together contributions to important areas of research and engineering. The collection presents early findings and case studies on a wide range of topics, including: Advances in Residual Stress Measurement Methods Residual Stress Effects on Material Performance Inverse Problems and Hybrid Techniques Thermoelastic Stress Analysis Infrared Techniques Research in Progress Applications in Experimental Mechanics

Download or read book Proceedings of the Second International Conference on Structural Stability and Dynamics written by G. R. Liu and published by World Scientific. This book was released on 2003 with total page 1083 pages. Available in PDF, EPUB and Kindle. Book excerpt: ICSSD 2002 is the second in the series of International Conferences on Structural Stability and Dynamics, which provides a forum for the exchange of ideas and experiences in structural stability and dynamics among academics, engineers, scientists and applied mathematicians. Held in the modern and vibrant city of Singapore, ICSSD 2002 provides a peep at the areas which experts on structural stability and dynamics will be occupied with in the near future. From the technical sessions, it is evident that well-known structural stability and dynamic theories and the computational tools have evolved to an even more advanced stage. Many delegates from diverse lands have contributed to the ICSSD 2002 proceedings, along with the participation of colleagues from the First Asian Workshop on Meshfree Methods and the International Workshop on Recent Advances in Experiments and Computations on Modeling of Heterogeneous Systems. Forming a valuable source for future reference, the proceedings contain 153 papers ? including 3 keynote papers and 23 invited papers ? contributed by authors from all over the world who are working in advanced multi-disciplinary areas of research in engineering. All these papers are peer-reviewed, with excellent quality, and cover the topics of structural stability, structural dynamics, computational methods, wave propagation, nonlinear analysis, failure analysis, inverse problems, non-destructive evaluation, smart materials and structures, vibration control and seismic responses.The major features of the book are summarized as follows: a total of 153 papers are included with many of them presenting fresh ideas and new areas of research; all papers have been peer-reviewed and are grouped into sections for easy reference; wide coverage of research areas is provided and yet there is good linkage with the central topic of structural stability and dynamics; the methods discussed include those that are theoretical, analytical, computational, artificial, evolutional and experimental; the applications range from civil to mechanical to geo-mechanical engineering, and even to bioengineering.

Download or read book Structural Safety Evaluation Based on System Identification Approaches written by Hans G. Natke and published by Springer-Verlag. This book was released on 2013-04-17 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contents of this book are classified into the following four parts: Damage descriptions and basic requirements, System identification, Interaction between system identification and damage evaluation, New concepts.

Download or read book Identification Methods for Structural Health Monitoring written by Eleni Chatzi and published by Springer. This book was released on 2016-05-25 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers in this volume provide an introduction to well known and established system identification methods for structural health monitoring and to more advanced, state-of-the-art tools, able to tackle the challenges associated with actual implementation. Starting with an overview on fundamental methods, introductory concepts are provided on the general framework of time and frequency domain, parametric and non-parametric methods, input-output or output only techniques. Cutting edge tools are introduced including, nonlinear system identification methods; Bayesian tools; and advanced modal identification techniques (such as the Kalman and particle filters, the fast Bayesian FFT method). Advanced computational tools for uncertainty quantification are discussed to provide a link between monitoring and structural integrity assessment. In addition, full scale applications and field deployments that illustrate the workings and effectiveness of the introduced monitoring schemes are demonstrated.

Download or read book Response Determination and Control of Structural Systems written by Ravi Kumar and published by . This book was released on 1993 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Problems in Structural Identification and Diagnostics General Aspects and Applications written by Cesare Davini and published by Springer. This book was released on 2014-05-04 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of papers illustrates the work done within a research project on structural identification and diagnostics. The papers deal with problems taken from civil engineering applications and cover various topics in this field, including crack detection in beams and rods, useful in damage detection.

Download or read book Hydro Environmental Analysis written by James L. Martin and published by CRC Press. This book was released on 2013-12-04 with total page 5742 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on fundamental principles, Hydro-Environmental Analysis: Freshwater Environments presents in-depth information about freshwater environments and how they are influenced by regulation. It provides a holistic approach, exploring the factors that impact water quality and quantity, and the regulations, policy and management methods that are necessary to maintain this vital resource. It offers a historical viewpoint as well as an overview and foundation of the physical, chemical, and biological characteristics affecting the management of freshwater environments. The book concentrates on broad and general concepts, providing an interdisciplinary foundation. The author covers the methods of measurement and classification; chemical, physical, and biological characteristics; indicators of ecological health; and management and restoration. He also considers common indicators of environmental health; characteristics and operations of regulatory control structures; applicable laws and regulations; and restoration methods. The text delves into rivers and streams in the first half and lakes and reservoirs in the second half. Each section centers on the characteristics of those systems and methods of classification, and then moves on to discuss the physical, chemical, and biological characteristics of each. In the section on lakes and reservoirs, it examines the characteristics and operations of regulatory structures, and presents the methods commonly used to assess the environmental health or integrity of these water bodies. It also introduces considerations for restoration, and presents two unique aquatic environments: wetlands and reservoir tailwaters. Written from an engineering perspective, the book is an ideal introduction to the aquatic and limnological sciences for students of environmental science, as well as students of environmental engineering. It also serves as a reference for engineers and scientists involved in the management, regulation, or restoration of freshwater environments.

Download or read book Structural Safety and Reliability written by Naruhito Shiraishi and published by Taylor & Francis US. This book was released on 1998 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vibration Testing and Applications in System Identification of Civil Engineering Structures written by Heung-Fai Lam and published by CRC Press. This book was released on 2022-09-06 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers vibration testing and identification of dynamic structural systems. It starts from the fundamentals of structural dynamics, and covers the methods of modal analysis and model identification, vibration tests and the related experimental setup. It concludes with an outline of the authors‘ software, demonstrating practical applications, and illustrated with real-world case studies of full-scale structures. Theory is presented and derived step-by-step, with a detailed measurement system developed for vibration tests. This book is written for Masters students and enables them to understand the theories of system identification and empowers them to apply this in practice.