Stochastic Subspace Method for Experimental Modal Analysis

Operational Modal Analysis using a Fast Stochastic Subspace Identification Method

Stochastic subspace identification methods are an efficient tool for system identification of mechanical systems in Operational Modal Analysis, where modal parameters (natural frequencies, damping ratios, mode shapes) are estimated from measured ambient vibration data of a structure. System identification is usually done for many successive model orders, as the true system order is unknown. The...

Reference-based Stochastic Subspace Identification for Output-only Modal Analysis

When performing vibration tests on civil engineering structures, it is often unpractical and expensive to use arti"cial excitation (shakers, drop weights). Ambient excitation on the contrary is freely available (tra$c, wind), but it causes other challenges. The ambient input remains unknown and the system identi"cation algorithms have to deal with output-only measurements. For instance, realisa...

Vibration of cracked plate using differential quadrature method and experimental modal analysis

In this study, the vibration of cracked plates is investigated using the differential quadrature method and experimental modal analysis. The crack, which is assumed to be open, is modeled by the extended rotational spring. With its finite length, the crack divides the plate into six segments. Then, the differential quadrature is applied to the governing differential equations of motion and the ...

An experimental investigation of a state-variable modal decomposition method for modal analysis

ABSTRACT This work presents the experimental evaluation of the state-variable modal decomposition (SVMD) method for modal parameter estimation of multi-degree-of-freedom and continuous vibration systems. Using output response ensembles only, the generalized eigenvalue problem is formed to estimate eigen frequencies and modal vectors for a lightly damped linear clamped-free thin experimental bea...

Experimental Modal Analysis