Abstract
The extended NGM (1,1,K) grey forecasting model had the defined type and white type mismatching problem. It proposed the extended NGM (1,1,K) model to eliminate the inherent bias caused by mismatch, the model also had given the prediction formula. Compared to the GM (1,1) model, the extended NGM (1,1,K) model had higher fitting and forecasting accuracy. The model was applied to spectrum prediction of Fe concentration of the oil in a certain type of military launch vehicle hydraulic system, it could determine the working status of the hydraulic system effectively combined with Fe concentration thresholds, the result show that the model is effective.
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