Reaction wheel with HTS bearings for mini-satellite attitude control

Zhang, Yong; Postrekhin, Y.; Bui, Ki; Chu, Wei‐Kan

doi:10.1088/0953-2048/15/5/336

Cited by 21 publications

(6 citation statements)

References 1 publication

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“…This could provide a powerful check on systematic errors, but could also complicate the analysis of the data. Rather than let the bearing slow down over a long period of time, it could be driven continuously with an induction or standard brushless motor [34]. If necessary a feed-back loop can be implemented to maintain constant speed.…”

Section: Discussion and Summarymentioning

confidence: 99%

A cosmic microwave background radiation polarimeter using superconducting bearings

Hanany

Matsumura

Johnson

et al. 2003

IEEE Trans. Appl. Supercond.

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Abstract-Measurements of the polarization of the cosmic microwave background (CMB) radiation are expected to significantly increase our understanding of the early universe. We present a design for a CMB polarimeter in which a cryogenically cooled half wave plate rotates by means of a high-temperature superconducting (HTS) bearing. The design is optimized for implementation in MAXIPOL, a balloon-borne CMB polarimeter. A prototype bearing, consisting of commercially available ringshaped permanent magnet and an array of YBCO bulk HTS material, has been constructed. We measured the coefficient of friction as a function of several parameters including temperature between 15 and 80 K, rotation frequency between 0.3 and 3.5 Hz, levitation distance between 6 and 10 mm, and ambient pressure between 10 −7 and 1 torr. The low rotational drag of the HTS bearing allows rotations for long periods of time with minimal input power and negligible wear and tear thus making this technology suitable for a future satellite mission.

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Section: Discussion and Summarymentioning

confidence: 99%

A cosmic microwave background radiation polarimeter using superconducting bearings

Hanany

Matsumura

Johnson

et al. 2003

IEEE Trans. Appl. Supercond.

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“…The electric field and shielding current induced in the superconductor bulk with the external magnetic field is as follows 28 :…”

Section: Superconducting Magnetic Levitation Forcementioning

confidence: 99%

Lubrication and stability enhancement by attaching superconducting magnetic force on non-contacting mechanical seals for reusable rocket turbopump

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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The purpose of this paper is to investigate the lubrication performance and stability improvement of rocket turbopump mechanical seals by attaching superconducting magnetic force. A comprehensive multiphysics numerical model is presented including microscale clearance flow, magnetic field, as well as three degrees of freedom dynamic motion. The Maxwell equation and modified Reynolds equation considering mass-conserving boundary conditions and turbulence flow were solved simultaneously at each time step to obtain the transient response of sealing parameters. Results indicate that the mechanical seal attaching superconducting magnetic force could dramatically improve carrying capacity and lubrication characteristics under heavy loading conditions, and it also has an appreciable effect on dynamic stability. It is worth exploring the application of superconducting magnetic force in reusable rockets and cryogenic equipment combined with its unique advantages.

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“…Therefore, miniaturization of all components on board the satellite is desirable. Reaction wheels for position control on satellites are an important key technology and difficult to miniaturize due to the special nature of their function [5].…”

Section: Introductionmentioning

confidence: 99%

Laser welding of austenitic ferrofluid container for the KRAKsat satellite

Janiczak

Pańcikiewicz

2021

Weld World

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The production of a ferrofluid container, intended for use in the KRAKsat (CubeSat type) satellite in space conditions, is presented. Mechanized laser beam welding for AISI 316L stainless steel test joint and container prototype was developed and tested. The welded test joints were examined by non-destructive visual, penetration and radiographic testing and destructive testing by macro- and microscopic examination, static tensile test, static bending test, and hardness measurements. The welded container prototype was examined by leak test, temperature-vacuum test and vibration test. Test joints’ evaluation showed a proper selection of welding parameters and expected quality of joints. Austenitic microstructure with small δ-ferrite content in base materials, heat-affected zones, and welds guarantees sufficient mechanical properties for this part geometry. The tensile strength range of test joints was 687–729 MPa, hardness range was 140–200 HV3, and the bending angle was 180°. Welding of the prototype container and testing of tightness, resistance to temperature changes, and vibration were successful. Compliance with flywheel design and manufacturing requirements will enable the launch of a research satellite into orbit with such a wheel.

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Reaction wheel with HTS bearings for mini-satellite attitude control

Cited by 21 publications

References 1 publication

A cosmic microwave background radiation polarimeter using superconducting bearings

A cosmic microwave background radiation polarimeter using superconducting bearings

Lubrication and stability enhancement by attaching superconducting magnetic force on non-contacting mechanical seals for reusable rocket turbopump

Laser welding of austenitic ferrofluid container for the KRAKsat satellite

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