J. Cheng [1]
June 14, 1993
Keywords:
This is the first part of the slanted-axis MMA antenna design report. General design of the antenna structure is provided. Some preliminary and dynamic analysis results are included. However, this part excludes the thermal and wind analysis which from other important parts of the antenna design study.
The proposed design has a homologically deformed rigid backup structure, which is supported by a 45 degree tilted bearing ring. The receiver cabin is located at the other side of the slanted bearing ring, above the azimuth bearing. This design has a higher rigidity, lower overall weight and more stable receiver position than the standard Cassegrain. However, it involves complex coordinate transformation, undesirable slanted bearing force condition and difficulties in accomodating an on axis slanted axis encoder. This report gives the preliminary calculation of the weight, stress, frequency range and error estimation. In the same report, the comparison between this design and classical Cassegrain or bent- Nasmyth design is also provided.
[1] NRAO/Tucson
Last modified: 09 December, 1999
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