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http://dx.doi.org/10.3795/KSME-A.2010.34.2.153

A Study on the Geometric Design Parameters for Optimization of Cooling Device in the Magnetocardiogram System  

Lee, Jung-Hee (BK21 Mechatronics Group, Department of Mechanical Design Engineering, Chungnam Nat'l Univ.)
Lee, Young-Shin (BK21 Mechatronics Group, Department of Mechanical Design Engineering, Chungnam Nat'l Univ.)
Lee, Yong-Ho (Korea Research Institute of Standards and Science(KRISS))
Lim, Hyun-Kyoon (Korea Research Institute of Standards and Science(KRISS))
Lee, Sung-Jin (BK21 Mechatronics Group, Department of Mechanical Design Engineering, Chungnam Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.34, no.2, 2010 , pp. 153-160 More about this Journal
Abstract
A magnetocardiogram (MCG) is a recording of the biomagnetic signals generated by cardiac electrical activity. Biomagnetic instruments are based on superconducting quantum interference devices (SQUIDs). A liquid cryogenic Dewar flask was used to maintain the superconductors in a superconducting state at a very low temperature (4 K). In this study, the temperature distribution characteristics of the liquid helium in the Dewar flask was investigated. The Dewar flask used in this study has a 30 L liquid helium capacity with a hold time of 5 d. The Dewar flask has two thermal shields rated at 150 and 40 K. The temperatures measured at the end of the thermal shield and calculated from the computer model were compared. This study attempted to minimize the heat transfer rate of the cryogenic Dewar flask using an optimization method about the geometric variable to find the characteristics for the design geometric variables in terms of the stress distribution of the Dewar flask. For thermal and optimization analysis of the structure, the finite element method code ANSYS 10 was used. The computer model used for the cryogenic Dewar flask was useful to predict the temperature distribution for the area less affected by the thermal radiation.
Keywords
Optimization; Cooling Device; Design Parameter; Dewar; Heat Transfer Rate;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
Times Cited By SCOPUS : 1
연도 인용수 순위
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