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23 June 1994 Multi-axis vibration cancellation for Stirling cryocoolers
Simon A. Collins, James D. Paduano, Andreas H. von Flotow
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Proceedings Volume 2227, Cryogenic Optical Systems and Instruments VI; (1994) https://doi.org/10.1117/12.178599
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States
Abstract
This paper describes an active multi-axis vibration cancellation system designed for the expander of a Hughes split Stirling cryocooler. The axial force and the two lateral torques generated by the expander are cancelled by an active counterbalance driven by electrodynamic forcing elements. The counterbalance drive signals are generated by an narrowband adaptive feedforward controller; load cells provide the error signals. Multi-axis cancellation results are presented in which 30 dB of cancellation was achieved at the first five axial harmonics while simultaneously the fundamental harmonic of both lateral torques was reduced by 20 dB. The system demonstrates that effective multi-axis cancellation can be implemented with compact hardware and simple analog electronics.
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Simon A. Collins, James D. Paduano, and Andreas H. von Flotow "Multi-axis vibration cancellation for Stirling cryocoolers", Proc. SPIE 2227, Cryogenic Optical Systems and Instruments VI, (23 June 1994); https://doi.org/10.1117/12.178599
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KEYWORDS
Cryocoolers
Analog electronics
Electrodynamics
Signal generators
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