Professor Andrei Metrikine from TU Delft  will visit our institute on Tuesday, October 1st , and he will give a talk of 2x45 minutes with a coffee& cake break between the two parts. Below you may find a title and abstract.

Title: Engineering and mathematical challenges associated with the dynamics of high-speed trains and foundations of offshore wind turbines

Abstract:  Two engineering applications are discussed in this presentation, namely the high-speed trains and offshore wind turbines. Focus is placed on the wave dynamics, stability and synchronization that govern certain aspects of these engineering systems. The engineering application discussed are important for the development of eco-friendly transportation and renewable marine energy. In relation to high-speed trains the problem of stability of the moving vehicle at high speeds is addressed. It is especially important for the magnetically levitated vehicles moving along a flexible structure. Such vehicles can excite the anomalous Doppler waves in the structure, which destabilize this vehicle. The mechanism of the instability is discussed along with the interplay of the instability caused by the anomalous Doppler waves and control of the levitation.
In discussion of the dynamics of  foundations of the offshore wind turbines three topics will be addressed. First, a description of an experimental campaign, in which a new, so-called GDP pile driving technology, was tested and assessed. The GDP stands for Gentle Pile Driving. It uses a novel shaker that generates both vertical and torsional vibrations at distinctly different frequencies. The pile dynamics in the course of driving as well as penetration speed will be addressed in the light of engineering and mathematical challenges associated with the development of this technique.
The next subject matter will be the underwater noise generated during installation of monopoles by means of impact and vibratory hammers. The role of the monopole-water-soil interaction in the noise generation and propagation will be focused upon. The third focal point will be the ice-induced vibrations of wind turbines that can occur due to interaction of level ice with support structures of the offshore wind turbines. This is an interesting synchronization phenomenon, which is potentially important for offshore wind turbines to be installed in the Baltic Sea and in ice-infested waters in general.