Abstract: At present, the energy efficiency evaluation of the manufacturing system in the machining workshop has many problems to be solved. For example, it needs to analyze the energy consumption based on a large number of machining experiments and it acquires the energy efficiency index depended on the empirical formula, more importantly, it doesn't realize the energy efficiency optimization after the energy efficiency evaluation. Therefore, firstly, based on the monitoring data of production management information system, an evaluation index of total factor energy efficiency for the manufacturing system is proposed. Secondly, the total factor energy efficiency is obtained by Data Envelopment Analysis method. Thirdly, the energy efficiency optimization method is used to construct the energy efficiency function, so that the quantitative methods of reducing energy consumption and improving energy efficiency are derived; Finally, the energy study on an assembly workshop of transmission box is taken as an example to verify the theoretical and application value of the evaluation and optimization method.

Key words: data envelopment analysis (DEA), total factor energy efficiency (TFEE), energy efficiency evaluation and optimization, the manufacturing system