Title :
Special design considerations for wind induced pointing errors in large unblocked aperture radio reflectors
Abstract :
The author shows trends in the behavior of the NRAO (National Radio Astronomy Observatory) 100-m Green Bank Telescope, through pressure loadings applied to the NRAO NASTRAN model of the proof-of-concept elevation structure. The analysis phase pursued questions pertaining to pointing error components that were not applied during the optimization process, as well as to generating procedures that would allow NRAO to evaluate the contractor model. The final set of environmental loadings provided for eight wind load sets, gravity-induced surface deformation constraints, and natural frequency constraints. Eleven components are included in the pointing error calculations. Pointing error scalars generated by the NRAO RF optics group were applied to these terms and resulting pointing errors calculated.<>
Keywords :
radiotelescopes; reflector antennas; Green Bank Telescope; NASTRAN model; NRAO; National Radio Astronomy Observatory; contractor model; environmental loadings; gravity-induced surface deformation; natural frequency constraints; optimization; pressure loadings; proof-of-concept elevation structure; unblocked aperture radio reflectors; wind induced pointing errors; wind load; Aerodynamics; Apertures; Feeds; Frequency; Gravity; Observatories; Radio astronomy; Telescopes; Testing; Wind energy generation;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-0730-5
DOI :
10.1109/APS.1992.221817
