As stated above, the aim of this paper is to derive a model simple enough to analytically study cup anemometer behavior but also complex enough to include the parameters most relevant to the problem.
As stated in Section 1, this is the solution for the simpler 2-cup modeling of cup anemometer behavior.
This dispersion of the testing results could be explained by the fact that a longer cup center rotation radius, [R.sub.rc], lowers the rotation speed, making the rotation movement less constant and more influenced by the third harmonic term [4, 136] (the rotation speed of a cup anemometer can be decomposed into different harmonic terms using the Fourier expansion: [omega](t) = [[omega].sub.0] + [[omega].sub.1] sin([[omega].sub.0]t + [[phi].sub.1]) + [[omega].sub.2] sin(2[[omega].sub.0]f + [[phi].sub.2]) + [[omega].sub.3] sin(3[[omega].sub.0]t + [[phi].sub.0])....
In this study, cup anemometer response was analyzed using the 2-cup analytical model.
Pindado and the other coauthors are truly indebted to Luis Gomez, Eva Diaz, Javier Medel, Clarisa Buendia, and the rest of the staff of the Library at the Aeronautics and Space Engineering School (Escuela de Ingenierta Aeronautica y del Espacio) of the Polytechnic University of Madrid (Universidad Politecnica de Madrid), for their constant support to the research carried out regarding cup anemometer performances.
Toloknov, "Characteristics of a cup anemometer and a procedure of measuring the wind velocity," Physical Oceanography, vol.
The aim of the present study is to analyze the response of an optoelectronic output anemometer (Climatronics 100075 by Climatronics Corp., also known as F460 model), equipped with different rotors, to have a better understanding of the effect of the geometry (size of the cups, distance of the cups to the rotation axis) on cup anemometer performances.
For low wind speeds (V = 4 m/s) the cup anemometer is less efficient in terms of transforming the wind velocity into rotational speed than for higher wind speeds (i.e., higher values of the anemometer factor, K, are shown).
Finally, it should also be said that as far as the authors know, this particular effect of the cups' size has not been included in the different analytical models developed to study cup anemometer behavior [30, 31, 33, 38, 40].
In the present work, the performance of a cup anemometer equipped with different rotors has been experimentally analyzed.
This fact confirms the mentioned third harmonic term as a useful parameter to study cup anemometer performance.
Crawford, "A simple form of sensitive electric contact cup anemometer," Journal of Scientific Instruments, vol.