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

Janzen, Paul C.; Keas, Paul

doi:10.1117/12.2056861

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…To meet SOFIA's challenging pointing control and image stability goals, additional systems to the telescope's main attitude control system are being studied and implemented. One is the Active Mass Damping (AMD) system designed by Moog CSA Engineering in collaboration with NASA and DSI (Keas et al, 2012;Janzen & Keas, 2014).…”

Section: Active Mass Dampersmentioning

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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Section: Active Mass Dampersmentioning

confidence: 99%

The SOFIA Telescope in Full Operation

Reinacher

Graf

Greiner

et al. 2018

J. Astron. Instrum.

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“…The SA-10 inertial actuators of Moog CAS Engineering have achieved good results in vibration and noise suppression of the SOFIA telescope assembly. The inertial actuator is capable of delivering 45 N, but in the control system the actuator is fuse-limited to about 7 N [21].…”

Section: Introductionmentioning

confidence: 99%

Design of a Maglev Inertial Actuator with High Mass Power Ratio for Lateral Vibration Control of Propulsion Shafting

Liu

et al. 2021

Actuators

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The maglev inertial actuators with high power and mass maybe effective for lateral vibration control of a propulsion shafting. But the mass power ratio of the actuators currently in use is too small to meet the requirements. In the paper, a maglev inertial actuator was innovatively designed with high mass power ratio. The structure of the magnetic circuit assembly and the suspending assembly were designed and optimized. To verify the property of the proposed maglev inertial actuator, a prototype with mass less than 8 kg was developed and tests were carried out. The minimum effective output force can reach 200 N within the frequency band of 20–300 Hz. A lateral vibration of a propulsion shafting system was constructed and the active control effect was tested. The experimental results show that the proposed maglev inertial actuator has a good effect on lateral vibration control of shafting.

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A review of large aperture Schlieren photography technique

Xie

Chen

2016

Selected Papers of the Photoelectronic Technology Committee Conferences Held November 2015

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

Cited by 3 publications

References 5 publications

The SOFIA Telescope in Full Operation

The SOFIA Telescope in Full Operation

Design of a Maglev Inertial Actuator with High Mass Power Ratio for Lateral Vibration Control of Propulsion Shafting

A review of large aperture Schlieren photography technique

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