Analysis of the alidade temperature behaviour of the medicina VLBI radiotelescope |
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| Authors: | R Ambrosini G Grueff M Morsiani G Maccaferri P Zacchiroli A Orfei |
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| Institution: | (1) Istituto di Radioastronomia, CNR, via Gobetti 101, 40129 Bologna, Italy;(2) Present address: Dipartimento di Astronomia, Università di Bologna, via Zamboni 33 |
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| Abstract: | Upgrading existing radiotelescopes to operate at higher frequencies requires not only a better reflecting surface accuracy, but also more precise pointing capability. To analyse the thermal behaviour of the 32 metre VLBI parabola at Medicina, we have installed accurate temperature sensors on the pedestal beams of the antenna and an inclinometer at the elevation axis. The thermal model presented here, starts from a structural Finite Elements Analysis of the radiotelescope and can closely predict the deformations measured by the inclinometer, even in the worst solar radiation conditions. This analysis allows also insights into future improvements. |
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| Keywords: | radiotelescopes pointing thermal analysis FEA analysis thermal shields |
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