Dynamics of a Superconducting Linear Slider

Valiente–Blanco, Ignacio; Pérez-Díaz, José-Luis; Díez-Jiménez, Efrén

doi:10.1115/1.4028928

Cited by 3 publications

(4 citation statements)

References 31 publications

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“…The property tables obtained from the NIST database were used for G-10 fiberglass epoxy, 316 stainless steel, and 6061-T6 aluminum. The values were extrapolated using curve-fitting equations of the following form: log10 y = a + b(log10T) + c(log10T) 2 + d(log10T) 3 + e(log10T) 4 + f(log10T) 5 + g(log10T) 6 + h(log10T) 7 + i(log10T) 8 (1) where y represents the property, T is temperature in Kelvin, and the coefficients a, b, c, d, e, f, g, h, and i depend on each material and property. The coefficients used in the simulation are given in Table 2.…”

Section: Nonlinear Materials Properties: Cp and K Vs Temperaturementioning

confidence: 99%

“…Cryocoolers provide compact power capacities and an adjustable cooling power and temperature, and they do not require refurbishment. They are commonly used for the testing of small samples and devices (smaller than 500 mm) [4][5][6][7]. However, the main drawbacks of cryocoolers are high price, low efficiency for cooling large volumes, the induction of vibrations in induction of vibrations in the samples, and lower reliability.…”

Section: Introductionmentioning

confidence: 99%

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Design and Test of Cryogenic Cold Plate for Thermal-Vacuum Testing of Space Components

et al. 2019

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This paper proposes a novel cryogenic fluid cold plate designed for the testing of cryogenic space components. The cold plate is able to achieve cryogenic temperature operation down to −196 °C with a low liquid nitrogen (LN2) consumption. A good tradeoff between high rigidity and low thermal conduction is achieved thanks to a hexapod configuration, which is formed by six hinge–axle–hole articulations in which each linking rod bears only axial loads. Thus, there is not any stress concentration, which reduces the diameter of rod sections and reduces the rods’ thermal conduction. This novel design has a unique set of the following properties: Simple construction, low thermal conduction, high thermal inertia, lack of vibrational noise when cooling, isostatic structural behavior, high natural frequency response, adjustable position, vacuum-suitability, reliability, and non-magnetic. Additionally, the presented cold plate design is low-cost and can be easily replicated. Experimental tests showed that a temperature of at least −190 °C can be reached on the top surface of the cold plate with an LN2 consumption of 10 liters and a minimum vibration frequency of 115 Hz, which is high enough for most vibration tests of space components.

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Section: Nonlinear Materials Properties: Cp and K Vs Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Test of Cryogenic Cold Plate for Thermal-Vacuum Testing of Space Components

et al. 2019

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“…A full mechanical experimental characterization of the mechanical properties of the SMB was done [49]. SMB maximum axial and radial load, stiffness, and force relaxation were characterized.…”

Section: Superconducting Magnetic Bearings (Smb)mentioning

confidence: 99%

Performance of Magnetic-Superconductor Non-Contact Harmonic Drive for Cryogenic Space Applications

et al. 2015

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Abstract:Harmonic drives are profusely used in aerospace mainly because of their compactness and large reduction ratio. However, their use in cryogenic environments is still a challenge. Lubrication and fatigue are non-trivial issues under these conditions. The objective of the Magnetic-Superconductor Cryogenic Non-contact Harmonic Drive (MAGDRIVE) project, funded by the EU Space FP7, is to design, build, and test a new concept of MAGDRIVE. Non-contact interactions among magnets, soft magnetic materials, and superconductors are efficiently used to provide a high reduction ratio gear that smoothly and naturally operates at cryogenic environments. The limiting elements of conventional harmonic drives (teeth, flexspline, and ball bearings) are substituted by contactless mechanical components (magnetic gear and superconducting magnetic bearings). The absence of contact between moving parts prevents wear, lubricants are no longer required, and the operational lifetime is greatly increased. This is the first mechanical reducer in mechanical engineering history without any contact between moving parts. In this paper, the test results of a −1:20 inverse reduction ratio MAGDRIVE prototype are reported. In these tests, successful operation at 40 K and 10 −3 Pa was demonstrated for more than 1.5 million input cycles. A maximum torque of 3 N· m and an efficiency of 80% were demonstrated. The maximum tested input speed was 3000 rpm, six times the previous existing record for harmonic drives at cryogenic temperatures.

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“…It is easy to anticipate the major step forward that contactless technology can bring to common industrial applications. For instance, one of the most important breakthroughs would be the reduction of noise and vibration in aerospace applications [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Aeronautical Magnetic Torque Limiter for Passive Protection against Overloads

Cristache¹,

Díez-Jiménez²,

Valiente-Blanco³

et al. 2016

Machines

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Actual aerospace and defense technologies present multiple limitations that need to be overcome in order to evolve to less contaminating and more efficient aircraft solutions. Contactless technologies come with essential advantages such as the absence of wear and friction. This work describes the design, prototype, and performance test according to RTCA-DO-160 of an aeronautical magnetic torque limiter. The results show correct continuous transmission operation (2250 rpm and 24 Nm) from −50 • C to +90 • C. Moreover, overload protection has been demonstrated for more than 200 jamming events without damage or required maintenance to the device.

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Dynamics of a Superconducting Linear Slider

Cited by 3 publications

References 31 publications

Design and Test of Cryogenic Cold Plate for Thermal-Vacuum Testing of Space Components

Design and Test of Cryogenic Cold Plate for Thermal-Vacuum Testing of Space Components

Performance of Magnetic-Superconductor Non-Contact Harmonic Drive for Cryogenic Space Applications

Aeronautical Magnetic Torque Limiter for Passive Protection against Overloads

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