The Development of Circle Fit Method for Frequency Response Function Curve Fitting of MDOF System

• Main Author: Fikri, Furqanul
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/38398
• Institution: Institut Teknologi Bandung

Vibration is a physical phenomenon which has significant role in understanding and controlling a mechanical structure condition. Dynamic properties of a mechanical structure can be evaluated from its dynamic characteristic which consists of natural frequency, damping ratio, and mode shapes. The dynamic characteristic of a mechanical structure can be determined by performing circle fit process to the measured Frequency Response Function (FRF). In this final project, a circle fit method has been developed for curve fitting process of the measured FRF MDOF. The circle fit method is developed using Matlab 7.3.0 (R2006b) programming language. The developed circle fit program is utilized to the measured FRF. It is intended to evaluate the influence of the FRF residue during curve fitting process. Utilizing the developed circle fit method, a theoretical FRF curve is obtain which is considerably close to the measured FRF. This good result is obtained when the curve fitting process is carried out by taking into account all modes available in the measured FRF. In the case the curve fitting process is conducted on some modes then the result show discrepancy between the measured and the theoretical FRFs which is caused by the FRF residue.