Anela Bajric

• PhD Mechanical Engineering
• PostDoc Position at University of Oxford

A sufficiently accurate mathematical representation of the viscous damping matrix from modal parameters is often limited to structures with light damping or an assumed structure of the damping matrix. These limitations are now circumvented by a novel expression, which reconstructs the damping matrix from the complex-valued eigenvectors and eigenval...

Output-only system identification techniques can estimate modal parameters of structures represented by linear time-invariant systems. However, the extension of the techniques to structures exhibiting non-linear behavior has not received much attention. This paper presents an output-only system identification method suitable for random response of...

Overhead collisions of trucks with low-clearance railway bridges cause more than half of the railway traffic interruptions over bridges in the United States. Railroad owners are required to characterize the damage caused by such events and assess the safety of subsequent train crossings. However, damage characterization is currently visual (subject...

Reliable predictions of the lifetime of offshore wind turbine structures are influenced by the limited knowledge concerning the inherent level of damping during downtime. Error measures and an automated procedure for covariance driven Operational Modal Analysis (OMA) techniques has been proposed with a particular focus on damping estimation of wind...

A single mass Bouc-Wen oscillator with linear static restoring force contribution is approximated by an equivalent linear system. The aim of the linearized model is to emulate the correct force-displacement response of the Bouc-Wen model with characteristic hysteretic behaviour. The linearized model has been evaluated by the root-mean-square error...

A single mass Bouc-Wen oscillator with linear static restoring force contribution is approximated by an equivalent linear system. The aim of the linearized model is to emulate the correct force-displacement response of the Bouc-Wen model with characteristic hysteretic behaviour. The linearized model has been evaluated by the root-mean-square error...

A single mass Bouc-Wen oscillator with linear static restoring force contribution is approximated by an equivalent linear system. The aim of the linearized model is to emulate the correct force-displacement response of the Bouc-Wen model with characteristic hysteretic behaviour. The linearized model has been evaluated by the root-mean-square error...

As a consequence of a paper presented by Michael Mistler at the VDI-Baudynamik-Tagung in Kassel, Germany, in April 2015, the authors checked the damping coefficients having been estimated for a footbridge in autumn 2014. Mistler stated that the critical damping ratio estimated from a halfpower bandwidth procedure to be dependent on frequency resolu...

Am Beispiel der experimentellen Untersuchung der dynamischen Eigenschaften einer Fußgängerbrücke werden Probleme bei der Bestimmung der Dämpfungskapazität eines Ingenieurtragwerkes diskutiert. Aus Gründen der Verständlichkeit wird zunächst relativ ausführlich auf diese Experimente, die für die Identifikation der modalen Eigenschaften der Brücke ben...

The prevailing Operational Modal Analysis (OMA) techniques provide in most cases reasonably accurate estimates of structural frequencies and mode shapes. In contrast though, they are known to often produce poor structural damping estimates, which is mainly due to inherent random and/or bias errors. In this paper a comparison is made of the effectiv...