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

• 作 者: CHEN Shi-wei LI Zhu-guo ZHOU Shou-xi
• 机 构: School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030, China
• 出 处: 中南工业大学学报（英文版）
• 发表日期: 2005年6期
• 关键词: GM(1 1) model oil monitoring spectrometric analysis internal combustion engine

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 intal 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 non-equal 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.