Plenary Lecture
The Relationship between Changes of Deflection and Natural Frequencies of Damaged Beams
Professor Rainer Gillich
"Eftimie Murgu" University of Resita
Romania
E-mail: gillichrainer@yahoo.de
Abstract: The paper describes the relationship between changes of deflection of beams due damages and the natural frequency changes. Previous papers relate the influence of damage location and severity upon the natural frequency changes of weak-axis bending vibration modes, for which the authors have found a correlation. It base on the reduction of stiffness in a slice of the beam and consequently on the reduction of the potential stored energy in that slice. While the stiffness reduction affect also the deflection under the own mass of the beam, we concluded that it can be found a relationship between deflection and frequency changes. Researches performed this direction revealed that it is a clear dependency between deflection and frequency changes, what makes deflection an important feature of beam behavior, usable in damage assessment.
Brief Biography of the Speaker: Gilbert-Rainer Gillich is Professor of Vibrations and Machine dynamics at the Faculty of Mechanics and materials Science of the “Eftimie Murgu” University of Resita - Romania. He earned undergraduate degree in Mechanical Engineering (1986) and PhD degree in Strength of materials, elasticity and plasticity (1999) at the “Politehnica” University of Timisoara. He gained extensive industrial experience in various fields of mechanical engineering, by working in the Steel Factory of Resita, which is completed by teaching and research activities at the “Eftimie Murgu” University of Resita and the Research Institute for Construction Equipment and Technology from Bucharest. These activities are concretized in several books and more than 100 articles in reference journals and international conferences, 17 finalized national and international founded research projects and 2 patents. Since 2002 he currently held courses at: Johannes Gutenberg Universitat Mainz (Germany) and Universita degli Studi di Sassari (Italy). He is official reviewer of some journals indexed in international databases and was involved in organizing international conferences as co-organizer, stream proposer or acting as program committee member or reviewer. He is member of the International Institute of Acoustics and Vibration (IIAV), European Acoustics Association (EAA), European Association for Signal Processing (EURASIP), the Balkan Environmental Association (B.EN.A.), The General Association of Engineers in Romania (AGIR), Romanian Acoustic Society (SRA), Romanian Association of Tensometry (ARTENS) and Robotics Society of Romania (SRR). His research interests are: Applied mechanics and vibration; Damage detection; Structural health monitoring; Signal analysis and signal processing; Acoustics; Environmental issues.