Attenuation of Cryocooler Induced Vibration Using Multimodal Tuned Dynamic Absorber
Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE(2017)
摘要
Modern infrared imagers often rely on low Size, Weight and Power split Stirling linear cryocoolers comprised of side-by-side packed compressor and expander units fixedly mounted upon a common frame and interconnected by the configurable transfer line. Imbalanced reciprocation of moving assemblies generates vibration export in the form of tonal force couple producing angular and translational dynamic responses. Resulting line of sight jitter and dynamic defocusing may affect the image quality. The authors explore the concept of multimodal tuned dynamic absorber, the translational and tilting modal frequencies of which are essentially matched to the driving frequency. Dynamic analysis and full-scale testing show that the dynamic reactions (forces and moments) produced by such a device may effectively attenuate both translational and angular components of cryocooler-induced vibration.
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关键词
cryocooler,infrared imager,vibration,line of sight jitter,multimodal tuned dynamic absorber
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