Aero-elastic Parameter Estimation of a 2.5 MW Wind Turbine Through Dynamic Analysis of In-Operation Vibration Data

Abstract

Aero-elastic parameters of a 2.5 MW-80 m diameter-wind turbine were extracted by using the in-operation vibration data recorded for various wind speeds and operating conditions. The data acquired by 8 strain gauges (2 sensors on each blade and 2 sensors on the tower) installed on the turbine was analyzed by using OMA (Operational Modal Analysis) methods while several turbine parameters (eigenfrequencies and damping ratios) were extracted. The obtained system parameters were then qualitatively compared with the results presented in a study from literature, which includes both aeroelastic simulations and in-field measurements performed on a similar size and capacity wind turbine. IntroductionGrowing energy demands require wind turbine manufacturers to design more efficient and higher capacity wind turbines which inevitably results in larger and larger new models to be put into service. However, an important consequence of this increase in size and flexibility of the structure is the complicated dynamic interaction between different parts of the turbine. Motion of the blades interacts with aerodynamic forces, electro-magnetic forces in the generator and the structural dynamics of several turbine components (drive train, nacelle and tower). Understanding these dynamic interactions, the corresponding structural behavior

Contactless Vibrational Analysis of Transparent Hydrogel Structures Using Laser-Doppler Vibrometry

“…Laser-Doppler vibrometry (LDV) is widely used to investigate mechanical vibrations in structural analysis [31,32], where it provides detailed insights into the behavior of engineered and natural structures subjected to dynamic forces, and provides access to material properties like elasticity and viscosity [33][34][35][36][37][38][39]. LDV is a fast contactless optical technology, which can acquire data from a distance at high temporal and spatial resolution and can readily be integrated into fabrication processes.…”