Attenuation of cryocooler induced vibration using multimodal tuned dynamic absorber

Cryogenic Engineering Conference 2017

材料科学;物理学

Veprik, A.^1 ; Babitsky, V.^2 ; Tuito, A.^3

SemiConductor Devices, POB 2250, Haifa

31021, Israel^1

Loughborough University, Epinal Way, Loughborough

LE11 3TU, United Kingdom^2

Israel MOD, Kirya, Tel Aviv

64734, Israel^3

关键词: Driving frequencies;    Dynamic absorber;    Dynamic reactions;    Full-scale testing;    Induced vibrations;    Infrared imagers;    Modal frequency;    Translational dynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012005/pdf
DOI  :  10.1088/1757-899X/278/1/012005

学科分类：材料科学（综合）

来源: IOP

【 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.