Abstracts Archive

The process of Finite Element (FE) modelling is often associated with uncertainties which necessitates its updating using measured data. Updating dynamical model has a considerable importance in Structural Health Monitoring (SHM), estimating the structural responses, and structural control applicati...

Technologically, an interesting way for reducing the dynamical amplifications induced by the blade mistuning of turbine engines is to use a detuning strategy. This means that a few different blade designs (in general 2) are used in order to define a blades pattern that constitutes a detuned configur...

In this paper surrogate models of the performance metrics of early-stage design of aerostructures are created to optimize a subset of design parameters based on some prescribed limits of the intended real system response. The designed system is that of an aircraft wing that is subjected to a design ...

Printed Circuit Boards (PCB) used in electric vehicles are subject to mechanical vibrations that affect reliability. Here, especially solder joints are a critical point of PCBs that can be damaged by mechanical vibrations. The surface strain at the solder location is often seen as a critical mechani...

Sequential Bayesian estimators are often employed in structural dynamics to estimate unknown probability density functions using incoming measurements and a mathematical process model. In the simplest case, where all variables of interest are normally distributed and the transitions are linear, the ...

Quantification of statistical errors in modal parameter estimates is a topic of intense interest in operational modal analysis, damage diagnosis, modal updating, among many other engineering fields. The uncertainty in the modal parameter estimates stems from the finite data length, unknown, or partl...

Aging vibration-prone structures may require up-to-date proofs of their load-bearing capacity for retrofitting or life-cycle assessments. The structural vibration response is affected by naturally variable structural properties and loads, known as aleatory uncertainties. With modeling, additional ep...

Tuned mass dampers are found to be successful in enhancing the structural performance of buildings subjected to wind or seismic loads, but their sensitivity against the uncertainties might strongly reduce their effectiveness. This paper thus provides some insights about the sensitivity of a novel hy...

In experimental structural dynamics, reliable estimation of Frequency Response Functions (FRF) is important to correctly characterize a mechanical system. In Experimental Modal Analy-sis (EMA), the FRFs are used as input to a modal parameter estimation algorithm to obtain the modal characteristics o...

Structural health monitoring (SHM), relies on evaluating how certain features change over time (such as natural frequencies), to detect changes indicative of damage. However, damage-sensitive features often respond to benign variations, such as changes in temperature, in addition to damage. These no...

Forced vibration tests have always been a reliable method for dynamic characterization of concrete dams. In this field, LNEC has an extensive experience, having conducted a large number of tests on concrete dams. Test methodologies have continuously evolved with substantial improvements in the contr...

This paper presents a methodology [1] devoted to updating the control parameters of large computational models in linear structural dynamics. In particular, we are interested in the linear vibrations in the frequency domain of complex structures that are characterized by the presence of numerous str...

Finding the response of a large dynamical system demands considerable computational resources. This demand further amplifies where repeated solutions are sought, such as uncertainty quantification, sensitivity analysis, optimization. Besides this, for a complex problem such as soil-structure interac...

Gantry robots, or cartesian manipulators, are popular choices for manufacturing due to their relatively simple control and movement precision. Currently, large gantry manipulators are being considered as part of the production of large structures, as in the case of wind turbine towers, offshore plat...

Metamaterials have recently emerged in the search for lightweight noise and vibration solutions. One of their appealing properties for noise control engineering is the ability to create stop bands, which are frequency ranges without free wave propagation. These stop bands arise from the sub-waveleng...

Surrogate models enable the efficient propagation of uncertainties in computationally demanding models of physical systems. We employ surrogate models that draw upon polynomial bases to model the stochastic response of structural dynamics systems. In linear structural dynamics problems, the system r...

Within the structural health monitoring (SHM) field, consistent research efforts have been invested in developing automatic vibration-based indirect methodologies for inspecting existing heritage conditions. Current trends are mainly focused on output-only automatic operational modal analysis (AOMA)...

Modelling the dynamic response of civil structures is vital for many applications, including structural health monitoring, reliability analysis and design optimization. These systems often feature responses governed by highly uncertain exogenous excitations, for example, ground motions, wind, or wav...

Vortex-induced vibrations (VIV) of floating structures play an essential role in offshore engineering design. The accurate prediction of structural response is critical as vortex shedding behind bluff bodies may lead to continuous degradation of structural performance or even catastrophic failure. T...

Structural optimization is the process of identifying the optimal set of design parameters for a structural system. Optimization technique provides an effective approach for rationally improving engineering structural design, both for structural system with deterministic and uncertain parameters. Mo...

Informal construction comprises 50% to 90% of residential construction in low and middle-income countries. A significant amount of these buildings is constructed in masonry infilled reinforced concrete (RC) frames, without engineering oversight and the license required for the construction. They are...