The significance of the evanescent spectrum in structure-waveguide interaction problems

Modal decomposition is often applied in elastodynamics and acoustics for the solution of problems related to propagation of mechanical disturbances in waveguides. One of the key elements of this method is the solution of an eigenvalue problem for obtaining the roots of the dispersion equation, which signify the wavenumbers of the waves that may...

A simple numerical model of a geometrically nonlinear Timoshenko beam

In the original problem for which this model was developed, onedimensional flexible objects interact through a non-linear contact model. Due to the non-linear nature of the contact model, a numerical time-domain approach was adopted. One of the goals was to see if the coupling between axial and transverse deformations had an influence on the...

Wave radiation from vibratory and impact pile driving in a layered acousto-elastic medium

A steel monopile is the most common foundation type of a wind turbine installed offshore and is driven into place with the help of vibratory or impact hammers. Underwater noise generated during the installation of steel monopiles has recently received considerable attention from international environmental organizations and regulatory bodies in...

A rotating ring in contact with a stationary load as a model for a flexible train wheel

A load moving on a center-fixed ring and the reciprocal problem, namely a rotating ring subjected to a moving load have been used in several works to study the tire dynamics. In contrast, very few papers exist in which the ring model has been used in order to study the dynamics of a train wheel. In this paper, a thin ring model is introduced to...

The completeness of the set of modes for various waveguides and its significance for the near-field interaction with vibrating structures

Modal decomposition is often used in geophysics and acoustics for the solution of problems related to wave propagation in elastic or acousto-elastic waveguides. One of the key elements of this method is the solution of an eigenvalue problem for obtaining the roots of the characteristic equation, which may signify either frequencies or...

On the vibro-acoustics of piles in layered media

The influence of friction at the ice-structure interface on the induced vibrations

Vertically-sided offshore structures occasionally experience sustained vibration due to drifting ice sheets crushing against them. These vibrations may lead to problems associated with structural integrity and safety. Traditionally, three regimes of interaction are distinguished: intermittent crushing, frequency lock-in and continuous brittle...

A semi-analytical model for predicting the levels of underwater noise from offshore pile driving

Novel ice induced vibration testing in a large-scale facility: Deciphering ice induced vibrations, part 1

A method to measure the added mass and added damping in dynamic ice-structure interation: Deciphering ice induced vibrations, part 3