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題名 | 非破壞性測定分等變異數之預估= |
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作者 | 王怡仁; |
期刊 | 林產工業 |
出版日期 | 19880300 |
卷期 | 7:1 1988.03[民77.03] |
頁次 | 頁97-107 |
分類號 | 436.18 |
語文 | chi |
關鍵詞 | 分等; 非破壞性; |
中文摘要 | 非破壞性測定(nondestructive evaluation)分等為將來分等的/必然趨勢,然而對於分等之後各等級內的變異,迄今只能以等級內試驗(in-grade testing)求得。本研究依統計學原有的假設,推衍出一個方法,用以預測任一等級內的標準差(standard deviation)。研究之最終結果為一簡單公式,該公式利用等級區間(interval),非破壞性測定本身的估計標準誤(standard error of estimate)及材料試驗強度值的標準差(standard deviation)而求得任一等級內的標準差。該公式可以下式來示。RSD=0.0174 + 0.691 (RSEE) +0.223 (RI) +0.264 (RSEE)^2-0.145 (RSEE) (RI)+0.014 (RI)^2其中RSD、RSEE及RI分別為等級內標準差,非破壞性測定本身的估計標準誤及等級區間三者對材料試驗強度值標準差之比值。 |
英文摘要 | A procedure is developed to estimate the standand deviation of any nondestructive evaluation (NDE) grade with a known strength interval, and the associated standard error of estimate from the relationship between NDE predicted strength and actual strength. The common assumptions made for straight line regression, such as homogeneous variance and normal distribution, were kept. This research results in a simple formula in which the standard deviation of NDE grades are expressed as a function of known interval width, standard error of estimate, and variance of the actual strength population. The standard deviation of NDE grades can be. Computed by the fol1owingequation: RSD=0.0174-0.691(RSEE)+0.223(RI)+0.264(RSEE)^2-0.145(RSEE)(RI)+0.014(RI)^2 Where RSD, RSEE and RI are the ratios of standard deviation of NDE grade, standard error of estimate and NDE grade interval to the standard deviation of actual population, respectively. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。