Wind loading of large telescopes

Cho, Myung K.; Stepp, Larry M.; Angeli, George Z.; Smith, David R.

doi:10.1117/12.458191

Cited by 20 publications

(15 citation statements)

References 20 publications

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“…Our understanding of the wind inside a telescope enclosure is informed by measurements at Gemini South, 3,4 wind-tunnel experiments focused on the flow near M2 (Ref. 6), the loads on M1, 13 and CFD.…”

Section: Sources Of Datamentioning

confidence: 99%

“…Full-scale data are available from measurements taken at Gemini South Observatory. [3][4][5] More extensive data under more controlled conditions have been collected in an ϳ1% scale wind-tunnel experiment. 6 Finally, computational fluid dynamic (CFD) analyses 7 have been validated against these data sources and used primarily to understand differences between different sources of data.…”

Section: Introductionmentioning

confidence: 99%

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Wind loads on ground-based telescopes

et al. 2006

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One of the factors that can influence the performance of large optical telescopes is the vibration of the telescope structure due to unsteady wind inside the telescope enclosure. Estimating the resulting degradation in image quality has been difficult because of the relatively poor understanding of the flow characteristics. Significant progress has recently been made, informed by measurements in existing observatories, wind-tunnel tests, and computational fluid dynamic analyses. We combine the information from these sources to summarize the relevant wind characteristics and enable a model of the dynamic wind loads on a telescope structure within an enclosure. The amplitude, temporal spectrum, and spatial distribution of wind disturbances are defined as a function of relevant design parameters, providing a significant improvement in our understanding of an important design issue.

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Section: Sources Of Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wind loads on ground-based telescopes

et al. 2006

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“…The authors found that the pressure fluctuations on the primary mirror were extremely pronounced when the mirror was pointing into the wind with a small bandwidth of the wind loading. Cho et al (2003) also reported a similar study of the wind loading on the Gemini telescope. They found that the pressure fluctuations over the primary mirror were significant; however, the global wind force on the mirror was negligibly small.…”

Section: Review Of Flow Simulations On Large Telescopesmentioning

confidence: 76%

Unsteady Computational and Experimental Fluid Dynamics Investigations of Aerodynamic Loads of Large Optical Telescopes

Mamou¹,

Mébarki²,

Tahi³

2010

Computational Fluid Dynamics

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“…Some limited but valuable data is available from measurements taken at Gemini South observatory. 9,10 More extensive data under more controlled conditions has been collected in scaled wind-tunnel experiments; while this approach has been used for many years, 11 modern experimental techniques allow significantly more data to be collected. 12,13 Finally, computational fluid dynamics (CFD) [13][14][15] is an ideal design tool, and can take advantage of the experimental data for validation, so that CFD can be used with confidence in future design work.…”

Section: -8mentioning

confidence: 99%

Parametric modeling and control of telescope wind-induced vibration

et al. 2004

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A parametric model of the dynamic performance of an optical telescope due to wind-buffeting is presented. The model is being developed to support the design of next generation segmented-mirror optical telescopes through enabling rapid design iterations and allowing a more thorough exploration of the design space. A realistic performance assessment requires parametric descriptions of the wind, the structural dynamics, active control of the structure, and the optical response. The current model and its assumptions are presented, with the primary emphasis being on the parameterization of the wind forces. Understanding the temporal spectrum and spatial distribution of wind disturbances inside the telescope enclosure is one of the most challenging aspects in developing the overall parametric model. This involves integrating information from wind tunnel tests, computational fluid dynamics, and measurements at existing observatories. The potential and limitations of control to mitigate the response are also discussed, with realistic constraints on the control bandwidth obtained from the detailed structural model of a particular point design. Finally, initial results are presented on performance trends with a few key parameter variations.

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Wind loading of large telescopes

Cited by 20 publications

References 20 publications

Wind loads on ground-based telescopes

Wind loads on ground-based telescopes

Unsteady Computational and Experimental Fluid Dynamics Investigations of Aerodynamic Loads of Large Optical Telescopes

Parametric modeling and control of telescope wind-induced vibration

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