Performance of the Oxford Miniature Stirling Cycle Refrigerator

Bradshaw, T.; Delderfield, J.; Werrett, S. T.; Davey, G.

doi:10.1007/978-1-4613-2213-9_90

Cited by 28 publications

(15 citation statements)

References 3 publications

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“…The clearance seal, which refers to the radial clearance between piston and cylinder is always maintained during operation, can effectively achieve the dynamic seal between the piston and cylinder while avoiding any contact of them, thus radically eliminating the source of rubbing wear and the necessity of oil lubrication [33,34,[40][41][42][43]. The clearance seal is maintained by the mechanical suspension system mainly constituted by flexure springs, which are then manufactured by the appropriate material and designed with the peak stress safely below its fatigue limit so that the mechanical suspension system has a theoretically infinite life.…”

Section: Oxford-type Compressormentioning

confidence: 99%

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Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

Dang

2015

Cryogenics

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Section: Oxford-type Compressormentioning

confidence: 99%

“…clearance seal and flexure springs, were put forward by the researchers from the Oxford University at the time of the invention [40][41][42][43].…”

Section: Oxford-type Compressormentioning

confidence: 99%

Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

Dang

2015

Cryogenics

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“…The contract aimed at the transfer to industry of the Oxford University 80K Cooler design technology [1], leading to production readiness of the existing design. The key was to ensure repeatability of build and performance for the future.…”

Section: Industrialization Of the Isams Coolermentioning

confidence: 99%

Heritage Overview: 20 Years of Commercial Production of Cryocoolers for Space

Gibson¹,

Reed²,

Bradshaw³

et al. 2008

AIP Conference Proceedings

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The paper presents an overview of the results of industrialization of the ISAMS Stirling cooler technology, achieved through cooperation with the Rutherford Appleton Laboratory. Seven batches of coolers have been produced and delivered to international customers for various space applications. A summary of in-orbit flight heritage is presented showing flight telemetry data for detector and mounting interface temperatures, vibration and other drive parameters. Thirteen of the 50-80K cooler models have been launched, with many of the coolers having already exceeded their required lifetimes. Highlights of cooler commissioning and performance in orbit are presented, with discussion of lessons learned, focusing on the last three production batches of the 50-80K Stirling cooler.

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“…The best available space cryocoolers rely primarily on the historical "Oxford" heritage [1][2][3], where the closed cycle Stirling refrigeration is achieved by a cyclic compression and expansion of a gaseous working agent produced by the almost sinusoidal reciprocation of compressor and expander pistons. Resulting from the imbalanced motion of the above mechanical components is the vibration export, the instantaneous magnitude of which is the product of moving mass and instantaneous acceleration [4].…”

Section: Introductionmentioning

confidence: 99%

Low vibration microminiature split Stirling cryogenic cooler for infrared aerospace applications

Veprik¹,

Zechtzer²,

Pundak³

et al. 2012

AIP Conference Proceedings

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The space-borne infrared instrumentation is known to be inherently susceptible to cryocooler induced vibration, the attenuation of which usually relies on active multi-tonal momentum cancellation under supervision of a dedicated controller. In this approach, the typical single-piston expander is actively counterbalanced by a motorized counterbalancer and the typical dual-piston compressor is counterbalanced by actively synchronizing the motion of the opposing moving piston assembly. The feedback signals are usually provided by external vibration sensors (force transducers or accelerometers). Although compliant with the most stringent space requirements, like 0.2N rms over the frequency range 0-1kHz, such a conservative vibration control approach can result in using outdated, oversized, overweight and overpriced cryogenic coolers for some applications. Such a "space heritage" practice becomes increasingly unacceptable for space agencies now operating within tough monetary and time constraints. The authors are advocating the purely passive approach to a vibration control relying on the combined principle of tuned dynamic absorber and low frequency vibration isolator having a potential to outperform the systems of active vibration cancellation with respect to overall system effectiveness. This approach warrants particularly strong consideration for cost-sensitive missions.

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Performance of the Oxford Miniature Stirling Cycle Refrigerator

Cited by 28 publications

References 3 publications

Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

Heritage Overview: 20 Years of Commercial Production of Cryocoolers for Space

Low vibration microminiature split Stirling cryogenic cooler for infrared aerospace applications

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