Ph.D. Tezi Görüntüleme

Student:	Abdurrahman ŞAHİN
Supervisor:	Prof. Dr. Alemdar BAYRAKTAR
Department:	İnşaat Mühendisliği
Institution:	Graduate School of Natural and Applied Sciences
University:	Karadeniz Technical University, Turkey

Title of the Thesis:	DIGITAL SIGNAL PROCESSING DYNAMIC CHARACTERISTIC IDENTIFICATION AND FINITE ELEMENT MODEL UPDATING SOFTWARE FOR EXPERIMENTAL AND OPERATIONAL MODAL TESTING OF STRUCTURES SIGNALCAD MODALCAD FEMUP
Level:	Ph.D.
Acceptance Date:	12/6/2009
Number of Pages:	335
Registration Number:	Di691

Summary:

In this study, it is aimed to develop computer programs for the purpose of determining the dynamic behavior of structural systems by analyzing signal records collected from forced and ambient vibration tests and updating the theoretical models by assuming this behavior as reference and to perform applications of these programs on laboratory model. Computer programs with graphical user interfaces about digital signal processing, modal parameter estimation and finite element model updating required after experimental procedure have been developed in MATLAB. The software developed for digital signal processing is called as SignalCAD, the software developed for modal parameter estimation is called as ModalCAD and the software developed for finite element model updating is called as FemUP. Most of the algorithms in the literature have been implemented and included into the system in a functional structure and the opportunity to compare these algorithms has been provided.

This study consists of four main chapters. The first chapter includes literature investigations and theoretical formulations about digital signal processing, dynamic characteristic identification and optimization algorithm used in finite element model updating. In the second chapter, information about experimental measurements performed on laboratory model is given, analysis procedures of these measurement results by using developed computer programs are explained and obtained results are compared with those of commercial programs. In the third section, the results obtained from the analyses of measurement data of laboratory model by using developed computer programs are investigated as comparative.

In the last chapter, the results obtained from the study are evaluated in detail, and the recommendations proposed for future researches are presented.

Keywords: Experimental Modal Analysis, Operational Modal Analysis, Forced Vibration, Ambient Vibration, Digital Signal Processing, Dynamic Characteristic Identification, Finite Element Model Updating, SignalCAD, ModalCAD, FemUP, MATLAB