The aerodynamically coupled flap-pitch equations of motion of a single blade have been derived in a rotating frame as function of the azimuth angle W, When W = Wt, the equations represent the motion of the tth blade. To derive the equations of motion of all the blades as a single unit, the coefficients in […]

Typically, in the case floating offshore wind turbine, it is attached to a tethered spar buoy which consists of a non-uniform vertical cylinder that provides the necessary buoyancy to keep the turbine in a stable floating equilibrium. Three or more spokes are attached to the cylinder and tethers are attached to the ends of these […]

The dynamics of compressor stall has been re-parameterized in a form that would facilitate the construction of a non-linear control law for the active non-linear control of compressor stall. The regions of stable performance in parameter space Root Locus Fig. 5.11 Root locus plot illustrating the effect of the negative feedback of D/c (y = […]

To increase the amount of power generated, a number of cells can be connected in series. This is known as stacking of cells. When several single fuel cells are working in parallel but are connected in series, they make up a fuel cell stack. The voltage of each cell is added up to give a […]

The capacity, Q, of a cell is the approximate amount of charge that can be stored in the cell when it is fully charged. Thus, the capacity is the amount of electric charge that a battery can store, which is stated in units of ampere-hour (A-h). The state of charge (SOC) is defined as the […]

Ocean energy is distributed across the oceans in several forms including marine currents, tidal currents, thermal energy, geothermal vents, and ocean waves. All of these forms are combinations of some form of solar, gravitational, and wind energy where the latter is due to the interactions of Coriolis effects with solar energy. Ocean waves arise from […]

The resistance of one stator winding is estimated based on its length, cross-sec­tional area, and conductivity. The coil length is partially in the slots and partially in the end region. Thus, the resistance may be estimated and is the basis for estimating the stator resistance. The squirrel-cage rotor resistance is determined by adding the contributions […]

To express the flapping and torsion blade equations of motion in terms of multi­blade coordinates the collective and cyclic summation operators are applied to them. Thus, the flapping and torsion blade equations in multiblade coordinates are J 1 0 0 J 0 0 0 ‘j 1 0 0 ‘hi’ X П 0 1 0 ec […]