关键词: 模式识别, Fisher判别, 数据处理, 石油, 沥青老化规律

Abstract: In this paper one of the pattern recognition methods,Fisher verdicts,is introduced fortreating the data of buried asphdalt coatings on pipes in the Daqing Oilfield.An extended lin-ear model and stepped verdicts are used to study the degradation of asphalt coatings. As a result,a simple expression with four variables:endurance(years);soil resistivity (Ω. m),saltcontent(%);and water content(%)is given as the criterion of coating degradation,Thecontributions of the above four variables on the classification of degradation degrees are alsoanalysed.In addition,the mathematical principles and the application methods of Fisher ver-djcts are introduced.