Mr. Benjamin Hauska Profile

Benjamin Hauska

at OHB Digital Connect GmbH

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Publications (2)

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Proceedings Article | 11 September 2024 Presentation + Paper

Prototyping activities during the development of the GMT mount

Eberhard Sust, Dietmar Koch, Jens Langguth, Ulrich Weis, Benjamin Hauska, Arne Mann, Aleksej Kiselev, Alexander Rohr, Alexei Ippa

Proceedings Volume 13094, 130940B (2024) https://doi.org/10.1117/12.3019011

KEYWORDS: Design, Telescopes, Mirrors, Prototyping, Earthquakes, Deformation, Actuators, Vibration

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The Giant Magellan Telescope (GMT) will be a 25-meter optical telescope with a maximum weight of about 2300 t, located on Cerro Las Campanas in Chile. To fulfill the challenging pointing and tracking accuracy requirements, as well as the functionality requirements of the auxiliary subsystems, complex design solutions needed to be developed. To support and validate the design of those subsystems and to provide reliable data and parameter for performance analysis, a variety of prototyping tests have been performed during the design phase. The telescope support consists of a radial spring system that allows thermal decoupling to the concrete foundation, an earthquake damping system as well as frictionless hydrostatic bearings and a high-performance direct drives and control system. Highly accurate and precise mechanical components need to be consistent to gravity-caused structural deformations. This requires special supports to avoid structural overload. These unique supports, especially developed for the GMT have been prototyped. Self-induced vibrations are one of the most disturbing influences on such complex control systems as well as the adaptive optics of the telescope and need to be suppressed or at least reduced wherever possible. Tests have been performed to measure and optimize vibration sources like cable wraps and electronic cabinets. The covers of the primary mirrors with a diameter of more than eight meters were developed and tested in full scale to ensure proper function even in tilted position when the telescope rotates in elevation. Falling object tests have been made to demonstrate the protection of the mirrors. An inflatable wash seal around each mirror has been tested to ensure reliable functionality. The presentation will provide an overview on the subsystem development test activities and show test setups and results of main component tests supporting the subsystems design and analyses.

Proceedings Article | 29 August 2022 Presentation + Paper

Earthquake acceleration control at the Giant Magellan Telescope mount

Eberhard Sust, Joe Hammes, Peter Eisenträger, Ulrich Weis, Lars Steurer, Benjamin Hauska

Proceedings Volume 12182, 1218217 (2022) https://doi.org/10.1117/12.2629303

KEYWORDS: Earthquakes, Telescopes, Prototyping, Safety

Read Abstract +

The Giant Magellan Telescope (GMT) will be a 25 meter optical telescope with a maximum weight of about 2300t, located on Cerro Las Campanas in Chile. The telescope will be equipped with a complex adaptive optical system as well as highly sensitive instrumentation and high performance drive and control components like direct drives and high resolution band encoders. For protection of this sensitive equipment from extreme earthquake excitations, a seismic isolation system implemented at the base of the concrete telescope pier will reduce horizontal accelerations. A second earthquake damping system, currently under development at OHB, will be installed on the GMT Mount to suppress vertical accelerations. In addition to the damping system itself, adaptations need to be made to the drive and control components to allow the damping system movements without having an impact on their functionality. A prototype of the vertical damping system will be built and dynamic testing will be performed. The presentation will provide an overview on the system development status.

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