Sardinia Radio Telescope (SRT) with its 64 m diameter primary mirror is a modern radio-astronomic facility. Its large dimensions allow to reach high performances, but, at the same time, make the antenna sensitive to deformations caused by environmental factors such as gravity, wind and temperature changes. Indeed, it is important to determine the effects that environmental loads produce on this structure. In this paper, the SRT pointing error variation produced by solar radiation acting on its structural system has been studied. Through a sensitivity analysis it was possible to establish that the Alidade is the radio telescope component that produces higher pointing errors when subjected to thermal load. Then, an analytical model was used to estimate the temperature of the Alidade trusses exposed to solar radiation. Furthermore, the calibration of the analytical model parameters was performed by comparing the experimental data obtained by thermographic investigations. Then, using Finite Element Analysis, the pointing error generated by each simulated thermal scenario was determined. Finally, the numerical results allow to better understand the structural behavior of SRT in realistic thermal conditions.

Sardinia Radio Telescope structural behavior under solar thermal load

Stochino F.
;
Sanna G.;Cazzani A.
2022-01-01

Abstract

Sardinia Radio Telescope (SRT) with its 64 m diameter primary mirror is a modern radio-astronomic facility. Its large dimensions allow to reach high performances, but, at the same time, make the antenna sensitive to deformations caused by environmental factors such as gravity, wind and temperature changes. Indeed, it is important to determine the effects that environmental loads produce on this structure. In this paper, the SRT pointing error variation produced by solar radiation acting on its structural system has been studied. Through a sensitivity analysis it was possible to establish that the Alidade is the radio telescope component that produces higher pointing errors when subjected to thermal load. Then, an analytical model was used to estimate the temperature of the Alidade trusses exposed to solar radiation. Furthermore, the calibration of the analytical model parameters was performed by comparing the experimental data obtained by thermographic investigations. Then, using Finite Element Analysis, the pointing error generated by each simulated thermal scenario was determined. Finally, the numerical results allow to better understand the structural behavior of SRT in realistic thermal conditions.
2022
FE analysis
Pointing error
Shading
SRT
Thermal load
File in questo prodotto:
File Dimensione Formato  
Attoli_Stochino_Structures2022.pdf

Solo gestori archivio

Tipologia: versione editoriale
Dimensione 19.68 MB
Formato Adobe PDF
19.68 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pre_Print.pdf

accesso aperto

Tipologia: versione pre-print
Dimensione 2.08 MB
Formato Adobe PDF
2.08 MB Adobe PDF Visualizza/Apri
Accepted_Manuscript.pdf

Open Access dal 02/05/2023

Tipologia: versione post-print
Dimensione 2.32 MB
Formato Adobe PDF
2.32 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/333009
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 5
social impact