Wind responses of Giant Magellan telescope

被引：4
|
作者：
Irarrazaval, Benjamin [1 ]
Buleri, Christine [2 ]
Johns, Matt [1 ]
机构：
[1] GMTO Corp, 251 S Lake Ave Suite 300, Pasadena, CA 91101 USA
[2] Quartus Engn, San Diego, CA 92121 USA
来源：
MODELING, SYSTEMS ENGINEERING, AND PROJECT MANAGEMENT FOR ASTRONOMY VI | 2014年 / 9150卷
关键词：
D O I：
10.1117/12.2057130
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Giant Magellan Telescope (GMT) is 25 meter diameter extremely large ground based infrared/optical telescope being built by an international consortium of universities and research institutions. It will be located at the Las Campanas Observatory in Chile. The GMT primary mirror consists of seven 8.4 meter diameter borosilicate mirror segments. Two seven segment Gregorian secondary mirror systems will be built; an Adaptive Secondary Mirror (ASM) to support adaptive optics modes and a Fast-steering Secondary Mirror (FSM) with monolithic segments to support natural seeing modes when the ASM is being serviced. Wind excitation results in static deformation and vibration in the telescope structure that affects alignment and image jitter performance. The telescope mount will reject static and lower frequency windshake, while each of the Fast-steering Secondary Mirror (FSM) segments will be used to compensate for the higher frequency wind-shake, up to 20 Hz. Using a finite element model of the GMT, along with CFD modeling of the wind loading on the telescope structure, wind excitation scenarios were created to study the performance of the FSM and telescope against wind-induced jitter. A description of the models, methodology and results of the analyses are presented.
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页数：18
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