منابع مشابه
Power and Velocity Control of Wind Turbines by Adaptive Fuzzy Controller during Full Load Operation
Research on wind turbine technologies have focused primarily on power cost reduction. Generally, this aim has been achieved by increasing power output while maintaining the structural load at a reasonable level. However, disturbances, such as wind speed, affect the performance of wind turbines, and as a result, the use of various types of controller becomes crucial.This paper deals with two ada...
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We analyze the time series of hourly average wind speeds measured at 29 different stations located in Sicily, a region with a complex morphology. The investigation, performed from the univariate as well as the multivariate point of view, evidences that the statistical properties of wind at the single sites have features that are not reproduced by standard models and, thus, require specific mode...
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Following a given classi®cation of geomagnetic activity, we obtained aa index values for the Maunder minimum (1645±1715). It is found that the recurrent and ̄uctuating activities were not appreciable and that the shock activity levels were very low. The aa index level was due almost entirely to the quiet days. Calculated average solar-wind velocities were 194.3 km s from 1657 to 1700 and 218.7 ...
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The combined effects of wind velocity and percent slope on flame length and angle were measured in an open-topped, tilting wind tunnel by burning fuel beds composed of vertical birch sticks and aspen excelsior. Mean flame length ranged from 0.08 to 1.69 m; 0.25 m was the maximum observed flame length for most backing fires. Flame angle ranged from -46o to 50o. Observed flame angle and length da...
متن کاملComputer simulation of coherent Doppler lidar measurement of wind velocity and retrieval of turbulent wind statistics
C. Werner DLR Institute of Atmospheric Physics D-82234 Wessling, Germany E-mail: [email protected] Abstract. We describe the algorithms for the simulation of cw and pulsed coherent Doppler wind lidar operation in a turbulent atmosphere and the methods to estimate the mean wind and the parameters of small-scale wind turbulence from lidar data. The algorithms are realized as LabView compute...
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ژورنال
عنوان ژورنال: Monthly Weather Review
سال: 1915
ISSN: 0027-0644,1520-0493
DOI: 10.1175/1520-0493(1915)43<609c:masatp>2.0.co;2