Abstracts Archive

With the growing demand for renewable energy, an increased number of offshore wind farms are planned to be constructed in the coming decades. The monopile is the main foundation of offshore wind turbines in shallow waters while the installation process itself takes place with large hydraulic impact ...

In this work, we study the application of the Herschel–Quincke (HQ) principle to the case of bending waves in a beam structure. This type of device is well known in acoustic tubes where an HQ filter consists of the bifurcation of a primary tube into two tubes of different lengths placed in paralle...

Efforts to create lightweight automotive components often result in structures that are more flexible. The use of lightweight gearbox housings for mass-reduction introduces the challenge of an increased dynamic response of the thin housing panels, resulting in higher structure-borne noise. The sound...

Ground motion induced by human activities related to construction has been a classical topic of great interest. Damage to nearby structures due to settlement, disturbance of occupants, jeopardy of serviceability and structural integrity are common effects of excessive vibrations. Pile driving is one...

One of the objectives in the study of periodic structures is the development of passive control techniques dedicated to application in light structures, to reduce the transmission of noise and vibration. Periodic structures have been gaining notoriety in the scientific community for their unique dyn...

The offshore wind industry is expanding rapidly due to the high demand for sustainable energy. Large wind farms are planned in the European seas in the coming decade, and because of that, concerns for environmental harm arise. The most significant environmental impact is during the foundation pile i...

Sandwich structures are encountered in numerous applications ranging from automotive and aerospace industry, to bridge construction. However, the design of these structures is a cumbersome task due to two reasons. Firstly, the performance of the sandwich configurations is both dependent on the acous...

The paper is devoted to the acoustic streaming (AS) in periodic porous structures constituted by rigid, or elastic scaffolds saturated by Newtonian barotropic fluid. The AS in porous media has been studied only very rarely so far in spite of many potential applications, such as tissue engineering, o...

Periodic systems exhibit frequency bands (pass-bands and stop-bands or bandgaps) which can manipulate propagating waves in certain frequency ranges. Phononic crystals (PCs) can create bandgaps by virtue of Bragg’s scattering, at wavelengths of the order of their unit cell size. However, this poses...

Leaks in water distribution systems are a major problem as a large amount of water is wasted between treatment plants and consumers. Water supply companies use different strategies to identify and locate leaks in their pipe networks. Among these are vibro-acoustic methods and devices (i.e. listening...

Hyperuniformity is a property of certain heterogenous media in which density fluctuations in the long wavelength range decay to zero. In reciprocal space this behavior translates into a decay of Fourier in- tensities in the range near small wavenumbers. In this paper quasiperiodic tilings constructe...

The reciprocity, orthogonality and bi-orthogonality relations are well established for symmetric waveguides, with the most known example being the Rayleigh-Lamb problem of wave propagation in an infinite elastic layer. In this paper, these relations are derived for non-symmetric waveguides using as ...

Scattering of elastic waves in materials with a single spherical inclusion is an archetype of many scattering problems in physics and geophysics with applications in material characterization, non-destructive testing, medical ultrasound, etc. The study of spherical inclusions, besides their simplici...

A semi-infinite thin shell is considered within the framework of 2D Koiter-Sanders theory. The focus is on the frequency domain near the lowest cut-off frequencies, being of order of the relative shell thickness, with the values tending to zero at a thin shell limit. Within this domain, the dynamic ...

The present work is aimed to propose a multi-parameter feedback control method combined with couple stress elasticity to model piezoelectric micro plate coupled systems. The proposed methodology can be used to design controllers for tuning vibration and wave propagation properties of micro scale pla...

A method for the model order reduction of heavy-fluid cavities is proposed with the goal of building superelements in a finite element substructuring context. The non-symmetric displacement-pressure finite element formulation is considered. While there are numerous fluid-structure reduced order mode...

Quasiperiodic systems are characterized by deterministic patterns that exhibit correlation in the long-range order and present unique properties that have been the subject of extensive research in various areas of physics as electronics, electromagnetics or elasticity. One of the most visible featur...

An elastic layer submerged into a compressible fluid is considered. The results of the low-frequency asymptotic analysis are discussed. The adapted scaling corresponds to the so-called fluid-borne bending type wave. The approximate equations for the leading, first, second and third order are derived...

The dynamic response of thin-walled slender tubes is dominated by noisy flexural modes. One topic of interest in research today is the use of acoustic metamaterials to reduce noise emissions from structures. These aspects are combined in the present work in which a solution for reducing the noise em...

Statistical Energy Analysis (SEA) techniques have been largely employed to model vibroacoustic systems as it simplifies the equations of motion of the system optimising the computing time, a useful feature to analyse random ensembles. However, the approach is limited to linear systems. Modelling vib...

The study introduced in this work focuses on the possible use of a hanging chain as an Acoustic Black Hole (ABH) for a passive vibration control solution. An acoustic black hole is effectively a waveguide in which a wave propagates away from the source and does not return. It can be achieved by expl...