Safety Evaluation Based on Identification Approaches Related to Time-Variant and Nonlinear Structures PDF
Preview Safety Evaluation Based on Identification Approaches Related to Time-Variant and Nonlinear Structures
Hans G. Natke . Geoffrey R. Tomlinson· James T. P. Yao Safety Evaluation Based on Identification Approaches Related to Time-Variant and Nonlinear Structures Vieweg International Scientific -------- Book Series Advanced Lectures in Mathematics, Gerd Fischer (Ed.) Advances in Control Systems and Signal Processing, Irmfried Hartmann (Ed.) Aspects of Mathematics, Klas Diederich (Ed.) Theory and Practice of Applied Geophysics, Andreas Vogel (Ed.) Progress in Earthquake Prediction Research, Andreas Vogel (Ed.) Notes on Numerical Fluid Mechanics, H. Hirschel, K. W. Morton, E. M. Murman, M. Pandolfi, A. Rizzi and B. Roux (Eds.) Methods in Clinical Pharmacology, Norbert Rietbrock and Barry Woodcock Advances in Solid State PhYSics Advances in Structure Research by Diffraction Methods Vieweg--------------------------~ Hans G. Natke . Geoffrey R. Tomlinson· James T. P. Yao Safety Evaluation Based on Identification Approaches Related to Time-Variant and Nonlinear Structures I I Vleweg All rights reserved e Frledr. Vieweg & Sohn Verlagsgesellschaft mbH, BraunschweiglWiesbaden, 1993 Vieweg is a subsidiary company of the Bertelsmann Publishing Group International. No part of this publication may be reproduced, stored in a retrieval system or transmitted, mechanical, photocopying or otherwise, without prior permission of the copyright holder. Printed on acid-free paper ISBN-13: 978-3-528-06535-5 e-ISBN-13: 978-3-322-89467-0 001: 10.1007/978-3-322-89467-0 v FOREWORD Safety evaluation by definition involves many complex factors and thus covers a wide range of topics. In order to focus the content of the workshop the subject matter was specific to the state of the art and the recent developments in nonlinear and time-variant methods employing identification procedures. Participants in the workshop represented a wide range of expertise. They were se lected in order to cover the state of the art of knowledge in fault-detection and dam age assessment, system identification, signal processing, mathematical and physical modelling and applications of techniques such as fuzzy logic and neural networks. The emphasis was placed on the exploitation and understanding of nonlinearity arising from structural or material faults. Figure 1 indicates the range of topics covered in the workshop. Since no unique or general approach yet exists for treating nonlinearity in the field of safety evaluation, many of the topics presented were problem specific. In order to assist the reader in selecting the material of primary interest a matrix of the topics covered by each participant is shown in Table 1. This table relates the authors to the subject matter, providing a guide through the diverse range of topics presented at the workshop. The structure of the contents of the proceedings, starting with an overview paper on the evaluation of diagnostic methods, follows the manner in which they were presented. The contents can be classified into the following four categories: • Test design, monitoring of structural behaviour (mainly advanced methods such as intensity measurements, spatially continuous measurements). • Damage detection and localisation by studying time-variant and nonlinear behaviour. • Methods of system identification (with respect to time-variant and nonlinear systems) including mathematical solutions ofthe generally ill-posed problems, treatment of the associated uncertainties, and their effects on structural reli ability. • Procedures for safety evaluation with emphasis on time-variant and/or non- linear systems (including fuzzy logic and neural nets). The achievements of the workshop are reflected in the number and diversity of the topics which were succesfully treated, the future directions which have been clearly identified and the areas which require further attention and research. These are discussed in the Summary and Conclusions at the end of the proceedings. It is clear that, as demonstrated by the contents of these proceedings, significant developments have taken place in the field of safety evaluation. However, the ability to model, validate and quantify nonlinear and time-variant problems is still in its infancy and remains to be studied further. VI ACKNOWLEDGEMENT The International Workshop on Safety Evaluation Based on Identification Ap proaches Related to Time-Variant and Nonlinear Structures was financially sup ported with a grant from the Volkswagen Foundation, and supplemented with a research award to H. G. Natke and J. T. P. Yao from the Max-Planck Society and Alexander von Humboldt Foundation in the Federal Republic of Germany. In addition we gratefully acknowledge the support of the following: Hannoversche Hochschulgemeinschaft, Hannover, Siemens AG (KWU), Erlangen, Volkswagen AG, Wolfsburg. We sincerely appreciate the generous support of these organisations. In particular, we wish to thank all the participants for their active participation and enthusiastic discussions during this workshop in Lambrecht, Pfalz on 6 - 9 September 1992, and for the preparation of their papers. H. G. Natke G. R. Tomlinson J. T. P. Yao VII List of Lecturers Prof. Dr. Johann Baumeister, FB Mathematik, Johann Wolfgang Goethe Universitat Frankfurt Prof. Dr. Y. Ben-Haim, Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Haifa, Israel Prof. Dr. C. Cempel, Applied Mechanics Institute, Poznan University of Tech nology Dr. P. Cowley, Rolls-Royce pIc, Derby, UK Prof. Dr.rer.nat. M. Heckl, Institut fr Technische Akustik, TU Berlin Prof. Dr.-Ing. R. Isermann, Institut f. Regelungstechnik, TH Darmstadt Prof. Dr. L. Jezeque1, Dept. de Mecanique des Solidesnology, Ecole Centrale de Lyon, Ecully, F Prof. M.P. Luong, Lab. de Mecanique des Solides, Ecole Poly technique, Palaiseau Cedex, F Prof. S.F. Masri, Dept. of Civil Engineering, University of Southern California, Los Angeles, CA, USA Prof. Dr.rer.nat. H. G. Natke, Curt-Risch-Institut, Universitat Hannover Prof. T. T. Soong, Dept. of Civil Engineering, University at Buffalo, USA Prof. N. Stubbs, Dept. of Civil Engineering, Texas A & M University, College Station, TX, USA Prof. Dr. G.R. Tomlinson, Dept. of Engineering, University of Manchester, UK Prof. H.S. Tzou, Dept. of Mech. Eng., Lexington, Kentucky, USA Dr. C. Valente, University "G. D'Annunzio", Pescara, I Prof. T. Vinh, Lab. de Rheologie et Structures, Institut Superieur des Materi aux et de la Construction Mecanique, Saint-Quen, F Prof. J. T.P. Yao, Dept. of Civil Engineering, Texas A &, M University, TX, USA Prof. L.A. Zadeh, Dept. of Electrical Engineering and Computer Sciences, Uni versity of California, Berkeley, CA, USA Prof. J. Zhang, Dept. of Engineering Mechanics, Xi'an Jiaotong University, P.R. China Table of Contents Evaluation of Diagnostic Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Y. Ben-Haim, C. Cempel, H. G. Natke, J. T. P. Yao Advantages and Disadvantages of Intensity Measurements 12 M. Heckl Measurements of Linear and Nonlinear Structures with Distributed Shell Sensors (Distributed Sensing and Identification) ..................... 28 H. S. Tzou Damage Evolution and Diagnosis in Operating Systems . . . . . . . . . . . . . .. 44 C. Cempel, H. G. Natke Time-Variant Methods in Machinery Diagnostics. . . . . . . . . . . . . . . . . . . .. 62 W. Staszewski, G. R. Tomlinson Nonlinear Mechanical Systems, Sinusodia Excitation Signal and Modal Analysis: Theory .............................................. 75 L. Jezequel, C. -H. Lamarque A Damage Localization Algorithm for Nonlinear Structures ............. 93 N. Stubbs, K. G. Topole Dynamic Damage Indicators for Composite Based Structures .......... 107 T. Vinh Identification of Parameters, III-Posed ness and Adaptive Systems . . . . . .. 148 J. Baumeister Estimation of Physical Parameters for Dynamic Processes with Application to Fault Detection of an Industrial Robot ........................... 166 R.lsermann Detection and Location of Damage Causing Non-linear System Behavior . 188 H. G. Natke, J. T. P. Yao Nonlinear Problems in Selectively Sensitive Identification of Structures . .. 204 Y. Ben-Haim Safety Evaluation of Electric Pylons Using Impulse Testing ............ 222 M. P. Luong Damage Assessment Through Nonlinear Structural Identification . . . . . . .. 238 Ling Ge, T. J. Meyer, D. J. Mook, T. T. Soong The Identification of Non-linear Systems with Statistically Equivalent Polynomial Systems ........................................... 255 J. H. Zhang, H. G. Natke, Y. Qiu, X. N. Zhang Damage Assessment from the Dynamic Response of Deteriorating Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 276 F. Brancaleoni, D. Spina, C. Valente Some Issues in the Identification of Structural Systems Through the Use of Neural Networks .............................................. 292 S. F. Masri, A. G. Chassiakos The Application of Neural Networks to Condition Monitoring of Non-linear Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 308 P. H. Cowley Fuzzy Logic, Neural Networks and Soft Computing . . . . . . . . . . . . . . . . . .. 320 L. A. Zadeh Summary and Conclusions ...................................... 322 Evaluation of Diagnostic Methods Y. Ben-Haim Faculty of Mechanical Engineering Technion - Israel Institute of Technology Haifa, Israel C. Cempel H. G. Natke Poznan University of Technology University of Hannover Applied Mechanics Institute Curt-Risch-Institute Poznan, Poland Hannover, Germany J. T. P. Yao Texas A& M University Department of Civil Engineering College Station, TX, USA
The list of books you might like
