中文摘要：

制造业量大面广,能耗总量巨大;提升制造系统能量效率已成为各国制造业可持续发展的关键战略,国际上的研究非常活跃。为此,总结了制造系统能量效率（又称能效）的内涵,分析和概述了制造系统能量效率的研究现状;在此基础之上,总结了制造系统能量效率的研究内容,并提出由三类研究对象（能耗行业、能耗系统以及能耗组件）、四类基础理论或技术（能效建模、能效特性、能效评价和能效监控）、两类功能技术（制造系统运行能效优化技术和高能效制造系统建设技术）以及一个根本目标（提高制造系统运行能量效率）组成的制造系统能量效率研究内容体系框架;最后,考虑到离散制造系统能量效率问题的研究起步较晚、过去重视不够以及其复杂性等因素,分析和总结出了离散制造系统能量效率研究有待深化的五个难点问题,即离散制造系统能量效率建模问题、精细评价问题、产品能耗定额问题、高能效多目标优化问题和高能效机床设计问题。

英文摘要：

Manufacturing industries are in enormous quantity and consume great amount of energy. In recent years, improving energy efficiency in manufacturing systems has become a key strategy and a hot topic for sustainable manufacturing. The connotation of energy efficiency of manufacturing systems is summarized, and the statue of energy efficiency research on manufacturing systems is reviewed and analyzed. Based on the research progresses, a content architecture framework about energy efficiency research on manufacturing systems is developed. The framework encompasses three objects （ industries, systems and components of energy consumption）, four basic theories or technologies （ the characteristics, modeling, evaluation and monitoring of energy efficiency in manufacturing systems）, two kinds of functional techniques （the techniques for improving running energy efficiency of manufacturing systems and the techniques for developing energy-efficient manufacturing systems） and one basic target （promote energy efficiency of manufacturing system）. Finally, considering the statue of research on energy efficiency of discrete manufacturing systems （DMS）, which is lack of attention in past time and is studied late, the complexity of research on energy efficiency of DMS is analyzed. Five difficult problems for the research on energy efficiency of DMS are proposed and discussed, which are modeling for DMS, fine evaluation for DMS, energy allowance developing for products, multi-objective optimization for DMS and design for energy-efficient machine tools.