In recent years, individual pitch control has been developed for wind turbines, with the purpose of reducing blade and tower loads. Such algorithms depend on reliable sensor information. The azimuth angle sensor, which positions the wind turbine rotor in its rotation, is quite important. This sensor has to be correct as blade pitch actions should be different at different azimuth angle as the w...

In this paper a 3-D finite element (FE) investigation of soil-blade interaction is described. The effects of blade’s shape and rake angle are examined both numerically and experimentally. The soil is considered as an elastic-plastic granular material with non-associated Drucker-Prager material model. Contact elements with different properties are used to mimic soil-blade sliding and soil-soil c...

The influence of soil parameters and weeder design on implement performance is discussed. Soil parameters that are important in this context are cohesion, adhesion and internal friction. Important weeder design parameters are blade angles of attack and approach, blade overlap and blade support configuration. An example of an animal-drawn weeder developed in Mexico is analysed. An evaluation of ...

Abstract The current H-type vertical axis wind turbine (VAWT) airfoils are from horizontal or symmetry that designed at one angle of attack (such as α = 6°) rather than different angles attack. As a consequence, it cannot, to certain extent, increase power efficiency. Therefore, an optimal method VAWT blade in ranges is presented. It can be expressed by airfoil integrated function. Then, optimi...

The study proposes the use of a new generation aircraft based on cylindrical rotating blade propellers as means transportation. results research and development work carried out several dimensions are considered. obtained allow us to lay down certain basis for theory practice operation propellers. In process scientific research, an understanding role geometric ratios rotor elements number blade...

wind turbines are important devices that extract clean energy from wind flow. the efficiency of wind turbines should be examined under various working conditions in order to estimate off-design performance. numerous aerodynamic and structural research works have been carried out to compute aeroelastic effects on wind turbines. most of them suffer from either the simplicity of the modelling appr...