STATISTICAL ANALYSIS OF TEMPERATURE DATA FROM WIND TUNNEL TEST OF A VON KARMAN RADOME
JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
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Temperatures obtained from a wind-tunnel test on a Von Karman radome are studied and put into functional form for theoretical analysis of radome thermal stresses. It was found that the radome wall temperature can be expressed analytically by a single function that defines the temperatures at all points in the wall except for a short length near the tip for which another expression is developed. The single function is further separable by variables into two functions, one of which describes the spanwise distribution and the other, the wall-thickness distribution of the temperature. This finding is highly advantageous mathematically. The analytical and test results are presented and compared in three figures and recorded in two tables. Good agreement between experiment and analysis was found to exist with the difference range generally not in excess of approximately plus or minus 7 percent while being less than half this amount in most cases. The derived function overestimates the maximum temperatures by about 0.5 percent, but this is a conservative feature insofar as the theoretical prediction of thermal stress is concerned. The range of experimental error in the original data was reported by the test engineers to be also about plus or minus 7 percent.
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