Repeatability of Cryogenic Multilayer Insulation

Cryogenic Engineering Conference 2017

材料科学;物理学

Johnson, W.L.^1 ; Vanderlaan, M.^2 ; Wood, J.J.^3 ; Rhys, N.O.^3 ; Guo, W.^2,4 ; Van Sciver, S.^2,4 ; Chato, D.J.^1

Glenn Research Center, Cleveland

OH

44135, United States^1

National High Magnetic Field Laboratory, Tallahassee

FL

32310, United States^2

Yetispace, Huntsville

AL

35802, United States^3

Florida State University, Tallahassee

FL

32310, United States^4

关键词: Florida State University;    Glenn Research Center;    Identical components;    Large scale tanks;    Multi-layer insulation;    Standard deviation;    Test apparatus;    Thermal Performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012196/pdf
DOI  :  10.1088/1757-899X/278/1/012196

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Due to the variety of requirements across aerospace platforms, and one off projects, the repeatability of cryogenic multilayer insulation (MLI) has never been fully established. The objective of this test program is to provide a more basic understanding of the thermal performance repeatability of MLI systems that are applicable to large scale tanks. There are several different types of repeatability that can be accounted for: these include repeatability between identical blankets, repeatability of installation of the same blanket, and repeatability of a test apparatus. The focus of the work in this report is on the first two types of repeatability. Statistically, repeatability can mean many different things. In simplest form, it refers to the range of performance that a population exhibits and the average of the population. However, as more and more identical components are made (i.e. The population of concern grows), the simple range morphs into a standard deviation from an average performance. Initial repeatability testing on MLI blankets has been completed at Florida State University. Repeatability of five Glenn Research Center (GRC) provided coupons with 25 layers was shown to be +/- 8.4% whereas repeatability of repeatedly installing a single coupon was shown to be +/- 8.0%. A second group of 10 coupons has been fabricated by Yetispace and tested by Florida State University, the repeatability between coupons has been shown to be +/- 15-25%. Based on detailed statistical analysis, the data has been shown to be statistically significant.