Document Type

Thesis - University Access Only

Award Date


Degree Name

Master of Science (MS)

Department / School

Mechanical Engineering

First Advisor

Hamid R. Hamidzadeh


Identification of accurate mass, stiffness and damping characteristics of a dynamic system are necessary for determining control laws which are best suited for active control methodologies. The characteristics, namely frequencies, damping ratios, and mode shapes of a dynamic system are determined through several modal identification techniques. However, modal identification methods in both the frequency and time domains have difficulties for certain circumstances. Frequency domain techniques which utilize the steady-state response from various harmonic inputs often encounter difficulties when the resonant frequencies are closely distributed, the structure exhibits a high degree of damping, or the steady-state condition is hard to establish. Time domain techniques have produced successful results, but lack robustness with respect to measurement noise. In the present work, identification methods namely Impulse Response method and Eigensystem Realization Algorithm are combined to accurately identify the mass, stiffness, and damping matrices from noise measurements.

Library of Congress Subject Headings

System identification
Modal analysis




South Dakota State University



Rights Statement

In Copyright