Reverse finite element modelling and verification testing of the John A. Galt 26 m radio telescope

Mohammad Islam; Peter W. G. Byrnes; Timothy Robishaw; Han Qin Xin

doi:10.1117/12.2629637

26 August 2022 Reverse finite element modelling and verification testing of the John A. Galt 26 m radio telescope

Mohammad Islam, Peter W. G. Byrnes, Timothy Robishaw, Han Qin Xin

Proceedings Volume 12182, Ground-based and Airborne Telescopes IX; 121820V (2022) https://doi.org/10.1117/12.2629637
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

The Dominion Radio Astrophysical Observatory’s John A. Galt 26 m radio telescope serves multiple roles for the Canadian radio astronomy community. It is currently earmarked to serve as an interferometric reference for the Canadian Hydrogen Intensity Mapping Experiment (CHIME), Canadian Hydrogen Observatory and Radio Transient Detectors (CHORD), and Deep Dish Development Array 6m (D3A6) experiments. The attributes of this telescope make it ideal for spectropolarimetric studies of the interstellar medium, however instrumental conversion of unpolarized radiation into a polarized signal can corrupt the astronomical signal as the telescope undergoes various loading conditions. To characterize these effects, a finite element (FE) model of the telescope was constructed, based on available blue prints and supplemented by manual measurements. Gravity and wind load cases were analyzed for several elevation angles. The FE model will be validated by measuring the first several vibration modes of the actual telescope using the step-release method. This paper will describe the model development and analytical predictions, as well as the experimental approach used to validate these predictions, and will summarize initial results from these tests (if available).

Conference Presentation

Citation Download Citation

Mohammad Islam, Peter W. G. Byrnes, Timothy Robishaw, and Han Qin Xin "Reverse finite element modelling and verification testing of the John A. Galt 26 m radio telescope", Proc. SPIE 12182, Ground-based and Airborne Telescopes IX, 121820V (26 August 2022); https://doi.org/10.1117/12.2629637

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