Identifikácia modálnych vlastností s využitím operačnej modálnej analýzy

Abstract

This bachelor's thesis focuses on the application of Operational Modal Analysis (OMA) for the identification of modal properties. The thesis includes a literature review summarizing the fundamental knowledge and relationships regarding experimental, operational, and computational modal analysis. Following this is a section dedicated to the processing of digital signals, which are essential for the implementation of OMA.

The thesis further introduces OMA itself, its principle, applications, properties, and presents selected implementation variants. The Frequency Domain Decomposition (FDD) variant is implemented, and the individual steps of the procedure are practically commented on within the thesis.

The FDD procedure was tested and tuned using synthetic data from a computer model of a fictitious machine, created in COMSOL software. Subsequently, an experimental setup for practical measurement, structurally similar to the computer model, was realized. Measurements were performed using both experimental and operational modal analysis. Utilizing OMA, it was possible to successfully identify the natural frequencies and mode shapes.