**7. Conclusions**

The problem of energy consumption optimization in manufacturing systems has received attention with the rising concern of sustainability. This paper reviews articles in the field of energy optimization of O&M of manufacturing systems, covering several aspects related to the optimization procedures such as model construction, solution methods, and application areas. The main contributions of this paper are as follows:


For the research related to energy optimization, we believe that it has high application value and vast research space. Through reasonable O&M scheduling, energy savings can be achieved without changing production system structures, which will pave the way for the progressive promotion of sustainable manufacturing paradigms. Research in this area is expected to achieve greater attention and policy preferences. The systematic review of this paper can provide some references for future studies.

**Author Contributions:** Conceptualization, methodology, investigation, writing—original draft preparation, X.A.; editing, visualization, G.S.; validation, formal analysis, Q.L.; writing—review, supervision, project administration, funding acquisition, T.X.; data curation, Y.L.; resources, funding acquisition, R.M. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the National Key R&D Program of China (No. 2022YFF0605700), National Natural Science Foundation of China (No. 51875359 and 71971139), Natural Science Foundation of Shanghai (No. 20ZR1428600), Shanghai Science and Technology Innovation Center for System Engineering of Commercial Aircraft (No. FASE-2021-M7), Oceanic Interdisciplinary Program of Shanghai Jiao Tong University (No. SL2021MS008), and CSSC-SJTU Marine Equipment Forward Looking Innovation Foundation (No. 22B010432).

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The authors are indebted to the reviewers and editors for their constructive comments, which greatly improved the contents and exposition of this paper.

**Conflicts of Interest:** The authors declare no conflict of interest.
