ELT dome and telescope: performance analysis overview

Marchiori, Gianpietro; Rampini, Francesco; Mian, Stefano; Ghedin, Leonardo; Marcuzzi, Enrico; Bressan, Riccardo

doi:10.1117/12.2314942

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…There are few works related to natural disasters applied to industrial-scale telescopes, mostly focused on astronomical studies to analyze the phenomena and celestial bodies (Ray et al, 2022;Yushchenko et al, 2022), construction or partial or total improvement of the system (Marchiori et al, 2018;Morzinski et al, 2014;Allekotte et al, 2013), fault detection (Ortiz and Carrasco, 2018;Cho et al, 2020;Wu et al, 2020;Roelf, 2022), prognosis Roelf, 2022), and decision-making in maintenance (Costa et al, 2021;, among others.…”

Section: Previous Workmentioning

confidence: 99%

Reliability of industrial-scale telescopes in the event of seismic failures

Cho,

Jiménez,

Guevara

2024

Preprint

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Natural disasters have the potential to pose a significant threat to property, critical infrastructure, human health and safety, and some others. One of the most relevant natural disasters is earthquakes, which are high on the list of natural phenomena that most affect infrastructures and, at the same time, are the most unpredictable. This study uses the probabilistic seismic risk analysis method to estimate the condition of an industrial-scale telescope after the effect of an earthquake. The approach considers a seismic source model and ground motion prediction equations to evaluate the intensity measure of each telescope as a function of its location. Our simulation uses reliability via Monte Carlo to discover the probability of failure of each telescope taking into consideration the fragility curves described by its nature structure. Our method incorporates terrain characteristics and component robustness into the analysis of telescope performance at an affordable computational cost. We applied our method to the observatories that use industrial-scale telescopes established in Chile, and we showed that reliability is highly dependent on the robustness/fragility of the infrastructure. MSC Classification: 62P12 , 62P30 , 90B25

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Section: Previous Workmentioning

confidence: 99%

Reliability of industrial-scale telescopes in the event of seismic failures

Cho,

Jiménez,

Guevara

2024

Preprint

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Computational Fluid Dynamics-Based Systems Engineering for Ground-Based Astronomy

Vogiatzis,

Angeli,

Trancho

et al. 2024

Computation

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This paper presents the state-of-the-art techniques employed in aerothermal modeling to respond to the current observatory design challenges, particularly those of the next generation of extremely large telescopes (ELTs), such as the European ELT, the Thirty Meter Telescope International Observatory (TIO), and the Giant Magellan Telescope (GMT). It reviews the various aerothermal simulation techniques, the synergy between modeling outputs and observatory integrating modeling, and recent applications. The suite of aerothermal modeling presented includes thermal network models, Computational Fluid Dynamics (CFD) models, solid thermal and deformation models, and conjugate heat transfer models (concurrent fluid/solid simulations). The aerothermal suite is part of the overall observatory integrated modeling (IM) framework, which also includes optics, dynamics, and controls. The outputs of the IM framework, nominally image quality (IQ) metrics for a specific telescope state, are fed into a stochastic framework in the form of a multidimensional array that covers the range of influencing operational parameters, thus providing a statistical representation of observatory performance. The applications of the framework range from site selection, ground layer characterization, and site development to observatory performance current best estimate and optimization, active thermal control design, structural analysis, and an assortment of cost–performance trade studies. Finally, this paper addresses planned improvements, the development of new ideas, attacking new challenges, and how it all ties to the “Computational Fluid Dynamics Vision 2030” initiative.

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Dynamic Modeling and Vibration Characteristics Analysis of a Large-Scale Photoelectric Theodolite Tracking Frame

et al. 2022

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In this paper, the experimental modes of a large-scale photoelectric theodolite tracking frame are presented. On the basis of the experimental data and the gradient-less optimization approach, the modeling strategy and the parameterized equivalent dynamic finite element model are presented. Shafting, three-point leveling units, and other components are reasonably simplified during the modeling process. Influence factors such as contact stiffness are introduced as dynamic parameters in the model. The optimized parametric model obtained demonstrates that the linearization modeling strategy represents the dynamic response characteristics of this type of structure accurately. The maximum relative error of the first four-order natural frequencies between numerical simulation and experimental data is 4.45% when the consistency of mode shapes is taken into account. The research results in this paper can provide engineering guidance for the dynamic stiffness optimization design of the large-scale photoelectric theodolite tracking frame.

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ELT dome and telescope: performance analysis overview

Cited by 3 publications

References 2 publications

Reliability of industrial-scale telescopes in the event of seismic failures

Reliability of industrial-scale telescopes in the event of seismic failures

Computational Fluid Dynamics-Based Systems Engineering for Ground-Based Astronomy

Dynamic Modeling and Vibration Characteristics Analysis of a Large-Scale Photoelectric Theodolite Tracking Frame

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