Abstract: Due to the complexity of energy consumption of the discrete manufacturing system and the interaction between energy consumption indexes, the result of energy consumption analysis is hard to obtain, establishing energy efficiency evaluation index of discrete system, based on the three levels of energy consumption of products, equipment energy efficiency, the energy efficiency of task process. Furthermore, a method was proposed to analyze the discrete manufacturing process energy consumption based on improved principal component analysis method. The method introduced importance weights, overcame the shortcoming of traditional component analysis, which only emphasized the information weights, combined the subjective and objective of indexes which integrate, adopted the improved normalization during the data nondimensionalization to avoid the loss of original data information and considered every factors of energy consumption analysis of discrete manufacturing. Case analysis and simulation show that the improved method is more reasonable and stable.

Key words: discrete manufacturing, energy consumption, evaluation index system, improved principal component analysis