Abstracts Archive

Abstract: The floating offshore wind turbines (FOWTs) have been extensively studied and are being and will be installed more in the world to generate more clean energy to reduce the trend of global warming. The construction and maintenance of wind farms require a large number of ships, and some wind...

Floating wind turbines (FWT), which enable access to substantial wind resources in deep waters, have been anticipated to contribute significantly to achieving the carbon-neutral target. Popular simulation tools for this relatively new offshore technology adopt the linear potential flow theory borrow...

Propeller aircraft engines, and more generally engines with a large rotating part (turboprops, high bypass ratio turbojets, etc.) are widely used in the industry and are subject to numerous developments in order to reduce their fuel consumption. In this context, unconventional architectures such as ...

The exploration of the wind energy available offshore is of vital importance to overcome the energy dependence on fossil fuels and, depending on the deepness of different locations, this task may only be feasible if based on floating solutions. For onshore wind turbines, the fatigue damage experienc...

The prediction of vortex-induced vibrations is an essential topic for slender and lightweight structures like chimneys. In recent years, the available prediction models have been questioned in the context of their application for towers of wind turbines. One reason is that the significant tower heig...

The interest in improving our understanding on the seismic response of the support structures of large Offshore Wind Turbines (OWTs) is gradually increasing due to the present commitment to the replacement of fossil fuels with renewable energies, and the consequent expansion of offshore wind farms i...

Floating Offshore Wind Turbines (FOWTs) are ground-breaking systems in the renewable sector, capable to exploit wind energy in deep-water areas, where the resource is stronger and abundant with respect to onshore and near-cost sites. Their dynamic behavior results from the complex interaction of fle...

Operating wind turbines are complex systems due to fluctuating aerodynamic loads induced by turbulent wind fields, rotor rotation and the tower-rotor coupling dynamics. Difficulties have been claimed in structural identification of operating wind turbines using traditional operational modal techniqu...

One of the main challenges in wind energy production is reducing the costs related to Operations and Maintenance, which contribute to a significant portion of the Levelised Cost of Energy produced by wind farms, especially offshore, where wind conditions are harsher and access for maintenance is far...

Wind energy has increased its importance among renewable energy sources in recent years due to its high energy production capacity and the return of investment cost in a short time and has become a better alternative to conventional energy sources. The share of relatively large wind turbines in the ...

The rapid growth of the wind industry sector has motivated increasing sizes of wind turbines, with corresponding natural frequencies becoming smaller, and eventually shifted into the dominant portions of the wind and wave loading spectra. As a result of this effect and the increasing regularity of e...

From July 2021, a full-scale measurement campaign is carried out on two wind turbine towers with smooth surfaces (k/D  1.0∙10-6). Tower response (through accelerations) and wind pressure on the surface are measured. Throughout the one-year monitoring period, there were challenges in transferrin...

The ability of vortex generators (VGs) to improve aerodynamic performance has led to their widespread application in wind turbines. The complicated inflow that a rotor perceives and the propensity for flow separation cause VGs on wind turbines to typically suffer high flow unsteadiness. At such cond...

Stability analysis for a large-scale wind turbine has been an increasing topic in recent years, but its intrinsic mechanism is still blurring. This paper aims at developing an explicit and fully linearized Aero-Hydro-Struc model to reveal the instability phenomena and giving a novel insight into und...

Vortex-induced vibrations (VIV) is a phenomenon of self-exciting oscillations of elastic, or elastically mounted rigid bluff bodies exposed to in a gas or fluid flow. This sort of oscillations can be used to harvest electric energy from the kinetic energy of air or water flow. This fact determines t...

Modern wind turbines towers have a circular cross-section (commonly tubular and made of steel), which is needed to have the same behaviour in all wind directions. This entails that it has similar natural frequencies in the wind direction and in the perpendicular direction, the difference being due t...

In the last few years, offshore wind energy has been increasing significantly, being the energetic potential of this technology much higher than that of other renewables energies. Most of Offshore Wind Turbines (OWTs) installed in Europe are founded to the sea floor but, due to the increase in offsh...

Prediction of aeroelastic stability for large horizontal axis wind turbines is a key step in the design process to ensure structural safety against catastrophic failures. Historically, flutter has not been a major issue to interrupt the safe operation of wind turbines, but the trend of going bigger ...

The current trend in offshore wind energy is to design and install systems with larger swept areas that yield unprecedented efficiency standards. Nevertheless, large blades are needed to achieve these objectives. As a result of aerodynamic and structural tailoring, long and slender blades are produc...

Modern wind turbines are large and slender dynamical structures with a fatigue loading profile of complex nature. The guarantee of their structural integrity is paramount for materializing cost efficient and more reliable wind energy. The measurement of the global dynamic response and loads of wind ...

The recent increasing demand for electricity and renewable energy has encouraged the use of innovative wind-based methods for power extraction. Both macroscale systems (several hundred meters in scale), i.e., large onshore and offshore wind turbines, and micro-scale energy harvesters (few centimeter...

As the demand for renewable energy increases, wind turbine rotors will become larger with slender blades. Vortex Generators (VGs) are used for passive flow control to avoid flow separation and reduce unsteady loading on the thick root section of slender blades due to their simplicity, inexpensivenes...