Application of non-equal interval GM(1,1) model in oil monitoring of internal combustion engine

来源期刊：中南大学学报(英文版)2005年第6期

论文作者：陈士玮 李柱国 周守西

文章页码：705 - 708

Key words：GM(1,1) model; oil monitoring; spectrometric analysis; internal combustion engine

Abstract: The basic difference non-equal interval model GM(1,1) in grey theory was used to fit and forecast data series with non-equal lengths and different inertias, acquired from oil monitoring of internal combustion engines.The fitted and forecasted results show that the length or inertia of a sequence affects its precision very much, i.e.the bigger the inertia of a sequence is, or the shorter the length of a series is, the less the errors of fitted and forecasted results are. Based on the research results, it is suggested that short series should be applied to be fitted and forecasted; for longer series, the newer datum should be applied instead of the older datum to be analyzed by nonequal interval GM(1,1) to improve the forecasted and fitted precision, and that data sequence should be verified to satisfy the conditions of grey forecasting.