EATD

AcronymDefinition
EATDÉquipement Automobile Technologies Distribution (French: Automotive Equipment Technologies Distribution)
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References in periodicals archive ?
The centroid movement function is used to guide the calibration of the tracking error of the dish concentrator system as the following: measuring the focal spot on the focal plane in the dish concentrator system and extracting the centroid coordinates of the focal spot; adopting the centroid coordinates to calculate the double-axis tracking error of the EATD by (16) and then calibrating the tracking error of the dish concentrator.
The double-axis tracking error of the EATD and mirror slope error has significant influence on the intercept factor (Figure 10).
The solar heliostat in tower power plant also adopts the EATD [9] as shown in Figure 11.
Therefore, selecting the appropriate angle [[beta].sub.2] could make the vanish-reduction effect adopt the SETD's obvious intensity than the EATD during the tracking error transmission, in order to increase the influence of the tracking error of the tracking device on the dish concentrator.
In this paper, a flux distribution model of the focal plane of a dish concentrator system has been developed based on ray tracking method for researching the effect of the mirror surface slope error, DNI and EATD tracking error on the focal spot characteristics, and the error transmission law of the tracking error of the double-axis tracking device transmission to dish concentrator system.
(1) The azimuth tracking error [[epsilon].sub.2r] of the dish concentrator is transmitted by the azimuth tracking error [[epsilon].sub.2] of the EATD. When the error [[epsilon].sub.2] is constant, the error [[epsilon].sub.2r] decreases with the increase of the working elevation angle [beta] of the dish concentrator and the error [[epsilon].sub.2r] equals to 0 mrad when [beta] = 90[degrees].
Only the azimuth tracking error and elevation tracking error of the EATD have influence on the centroid's movement distance of the focal spot along x-axis and y-axis, respectively, and the centroid's moving distance has linear function relationship with the EATD tracking error.
(3) The vanish-reduction effect also exists in the azimuth tracking error of the EATD transmission to the solar heliostat.
Greek symbols [delta]: Solar half angle (mrad) [sigma]: Standard deviation of the mirror slope error (mrad) [[epsilon].sub.1]: Elevation tracking error of the EATD (mrad) [[epsilon].sub.2]: Azimuth tracking error of the EATD (mrad) [[epsilon].sub.2r]: Azimuth angle or spin angle tracking error of the dish concentrator (mrad) [beta]: Concentrator working elevation angle (degrees) [[beta].sub.1]: The intersection angle between the reflection ray (at heliostat center) and the horizontal plane (degrees) [[beta].sub.2]: Angle between spin axis and horizontal plane (degrees) [[theta].sub.m]: Lack angle of the dish concentrator (degrees).
Caption: Figure 6: Influence of the tracking error of the EATD on the dish concentrator.
Caption: Figure 7: Influence of the EATD tracking error on the flux distribution of the focal plane.
Caption: Figure 8: The flux distribution of the focal plane under the EATD tracking error (W/[m.sup.2]).