BAEs Life Test Results on Various Linear Coolers and Their Correlation with a First Order Life Estimation Method
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    BAEs Life Test Results on Various Linear Coolers

    and Their Correlation with a First Order 

    Life Estimation Method

    D.T. Kuo, T.D. Lody and S.W.K. Yuan

    BAE Systems, Cryogenic Products

    Sylmar, CA 91342


     Life test results of various models of BAE Stirling coolers are presented in this paper together with a first order life approximation model.

    A cryocooler life estimation method based on the Watt-Hour approach has been developed elsewhere1. According to this method, the total energy of a cryocooler (i.e., the product of mean input power and total operating time) is conserved. From actual life test data of input power rise as a function of time, the energy of the cooler in Watt-Hour can be calculated by integrating the life test curve. With this knowledge and the specification, one can proceed to estimate life. The biggest disadvantage of this method is that it requires prior knowledge of the life test data before life estimation can be performed. In the present paper, a first order approach is used to estimate the rise in input power as a function of time, which can then be used in life estimation.

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    About the author- Dr. Sidney Yuan is a consultant in the field of Low Temperature Physics and Cryogenics, and has written a Book on Cryogenics and published extensively in the field. E-Mail.

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