SOFIA telescope modal survey test and test-model correlation

Keas, Paul; Brewster, Rick; Guerra, J.E. Castillo; Lampater, Ulrich; Kärcher, Hans; Teufel, Stefan; Wagner, Jörg

doi:10.1117/12.856507

Cited by 8 publications

(4 citation statements)

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“…Therefore, we established the optimization model with these factors as design variables, the first-order nature frequency and the relative displacement between mirrors as design constraints, and the mass as an objective. The mathematical description of the optimization is as shown in Equation (5).…”

Section: Size Parameters Optimizationmentioning

confidence: 99%

“…t 1 and t 2 are set as the design variables. The objective and constraint functions are the same as those functions in Equation (5). After the convergence of optimization iteration, the optimized t 1 and t 2 are 12.5 mm and 9.8 mm, respectively.…”

Section: Performance Comparisonmentioning

confidence: 99%

“…Horizontal installation has advantages of a low centroid of the whole satellite and a high satellite fundamental frequency. It is generally used in space cameras with high stiffness requirements, such as the Sofia Space Telescope designed by the German Aerospace Center [5]. In this paper, in order to ensure the suitable lightweight ratio of the camera and stability of mirrors, the vertical installation is adopted.…”

Section: Introductionmentioning

confidence: 99%

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Optimization Design of the Spaceborne Connecting Structure for a Lightweight Space Camera

2020

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For a lightweight space camera installed vertically with a satellite platform, due to the different conditions between ground and orbit, the relative deformation between the camera and the satellite platform results in a drift of the camera line of sight (LOS), which affects the imaging quality. This paper proposed an optimization method for the spaceborne connecting structure considering the camera LOS drift. By using a variable density topology optimization method, the configuration of the connecting structure was obtained. Based on the configuration, the sensitivity of its size parameters to the system’s performance was analyzed. Analysis data showed that the size parameters have an obvious influence on the camera LOS shift. In order to obtain the optimal combination of size parameters, a multi-objective parametric optimization model was established. Finally, engineering analysis of the optimized structure showed that the system performances meet the design requirements of the satellite, and the lightweight ratio of the connecting structure reaches 54%. This study provides a reference for the design of other similar structures for space cameras.

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Section: Size Parameters Optimizationmentioning

confidence: 99%

Section: Performance Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization Design of the Spaceborne Connecting Structure for a Lightweight Space Camera

2020

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“…In the years between delivery and the start of°ight testing leading up to initial science°ights, great e®ort was put into improving those initial designs (Lampater et al, 2010;Lampater, 2014). A modal survey test (Keas et al, 2010) was performed on the telescope and a considerable amount of instrumentation was attached to the telescope structure for the initial SOFIA°ights to comprehensively characterize the structural dynamics of the telescope under disturbance.…”

Section: Pointing Controlmentioning

confidence: 99%

The SOFIA Telescope in Full Operation

Reinacher

Graf

Greiner

et al. 2018

J. Astron. Instrum.

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The SOFIA telescope is a 2.5[Formula: see text]m class Cassegrain telescope with Nasmyth focus. It is the largest telescope ever integrated into an aircraft. The telescope is exposed to the stratospheric environment during the observations and the fact that the telescope’s foundation, which is a Boeing 747 SP, is vibrating and moving in all degrees of freedom (DoF) requires a highly specialized and sophisticated design. Based on the telescope of its predecessor, the Kuiper Airborne Observatory (KAO), the SOFIA telescope design had to evolve to accommodate a telescope 2.5 times the size of KAO. In several hundred successful observation flights, the telescope proved that it performs not only as specified, but is also extremely reliable. Nevertheless, the telescope’s software and hardware are continuously upgraded to optimize its performance without interfering with the observation schedules to reach even more ambitious image size and pointing jitter goals to enable additional science cases. In addition, manufacturing of the line-replaceable units is in process to ensure that the SOFIA telescope can perform without any major interruptions for the envisioned 20 year lifetime. Some of the main features of the SOFIA telescope are its suspension assembly (SUA), which decouples the telescope from SOFIA’s fuselage with air springs and a spherical oil bearing, the extremely stiff Nasmyth tube (NT), which connects cavity and cabin mounted components of the dumbbell design, and the Secondary Mirror Assembly (SMA), which is used for chopping and fast pointing corrections. This paper aims to give an overview of these and all other major telescope subsystems in operation today. In addition, some of the upgrades, either implemented recently or slated for implementation shortly, are introduced.

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Implementation of an active vibration damping system for the SOFIA telescope assembly

Janzen

Keas

2014

SPIE Proceedings

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SOFIA telescope modal survey test and test-model correlation

Cited by 8 publications

References 0 publications

Optimization Design of the Spaceborne Connecting Structure for a Lightweight Space Camera

Optimization Design of the Spaceborne Connecting Structure for a Lightweight Space Camera

The SOFIA Telescope in Full Operation

Implementation of an active vibration damping system for the SOFIA telescope assembly

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