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Research of 3D Advanced Aerospace Composite Preforms Forming Technology and Equipment SHAN Zhongde, ZHOU Zhengxi, SUN Zheng, HUANG Hao, LIU Yang Journal of Mechanical Engineering    2023, 59 (20): 64-79.   DOI: 10.3901/JME.2023.20.064 Abstract （463）      PDF（pc） （1577KB）（537）       Knowledge map    Save Aiming at the significant demand for advanced composite materials in high-end national aerospace equipment, focusing on the basic research of high-performance composite component 3D preform forming technology and equipment. The application of advanced composite 3D preform forming technology and equipment in the aerospace field is exemplified and the basic principles of typical 3D preform forming technology are analyzed. The progress of advanced composite material research institutions at home and abroad in the development of three-dimensional preform forming equipment is introduced. The key problems of 3D preform forming technology and equipment are summarized, then suggestions and prospects are put forward for the development of advanced composite material 3D preform forming technology and equipment. The goal is to summarize past experiences and provide new ideas for the further development of advanced composite material preform forming technology, so as to better assist the research and development of high-end equipment in the motherland aerospace industry. Reference | Related Articles | Metrics | Comments（0）

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Research Progress and Application of Electrostatic Atomization Minimum Quantity Lubrication XU Wenhao, LI Changhe, ZHANG Yanbin, YANG Min, ZHOU Zongming, CHEN Yun, LIU Bo, ZHANG Naiqing, XU Xuefeng Journal of Mechanical Engineering    2023, 59 (7): 110-138.   DOI: 10.3901/JME.2023.07.110 Abstract （224）      PDF（pc） （2523KB）（248）       Knowledge map    Save Minimum quantity lubrication (MQL) has been developed for decades as a viable alternative to flood lubrication. However, the surface energy of the micro-droplet produced by pneumatic atomization MQL gradually decreases; the penetration, adsorption and wetting properties of the jet are insufficient, and the drift and splash loss of the droplets are serious, increasing the pollution to the environment. Electrostatic atomization MQL is an effective way to solve the technical bottleneck and environmental pressure faced by industrial production applications. In this review, firstly, a systematic review of the key devices, empowerment principles and green atomization medium (nano-bio-lubricant) of electrostatic atomization MQL are presented. Subsequently, the influence mechanism of the atomization performance of the micro-droplets on the wetting performance of the cutting area is revealed, the excellent atomization performance of the electrostatic atomization is expounded from the perspective of the statics of the charged droplets, and the influence mechanism of different parameters on the atomization performance is analyzed by characterizing the charging performance of the atomization medium. Furtherly, based on the fatty acid molecular structure, viscosity and other physicochemical properties of nano-biolubricants, as well as the surface state of charged droplets, spatial multi-energy field, etc., the mechanism of electrostatic atomization MQL to improve droplet infiltration, wetting and film-forming properties was revealed, and its excellent performance in reducing tool wear and improving the quality of machined surface under turning, milling, grinding and other working conditions is reviewed. On this basis, it is considered that the excellent atomization characteristics of electrostatic atomization and the unique lubrication and heat transfer mechanism of nano-biolubricants can not only reduce the oil mist concentration in the machining environment, but also improve the machining performance of MQL. Specifically, compared with traditional MQL, PM2.5/PM10 is reduced by about 6.2%-68.3%, tool life is increased by about 48.1%-100%, and Ra is reduced by about 12.6%-39.3%. Finally, the future development trend is foreseen in the hope of providing technical support and theoretical reference for the carbon peaking and carbon neutrality transformation of manufacturing industry. Reference | Related Articles | Metrics | Comments（0）

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Research Status and Technology Path of Low-carbon Manufacturing under the Background of Emission Peak and Carbon Neutrality LI Hongcheng, CAO Huajun, LIU Lanwei, XING Bin, PAN Xin, WEN Xuanhao, GE Weiwei Journal of Mechanical Engineering    2023, 59 (7): 225-240.   DOI: 10.3901/JME.2023.07.225 Abstract （356）      PDF（pc） （67218KB）（634）       Knowledge map    Save Through the analysis of the development of low-carbon manufacturing at home and abroad, the connotation and theoretical system of low-carbon manufacturing are systematically discussed. The research status of low-carbon manufacturing technology innovation at home and abroad is then analyzed from several aspects, such as carbon emissions accounting and carbon footprint assessment, low-carbon product design and development, low-carbon manufacturing process and equipment, data-driven carbon emission dynamic monitoring, low-carbon optimized operation of manufacturing systems, carbon efficiency optimization and lean control of manufacturing process, and low-carbon manufacturing paradigm. Under the background of emission peak and carbon neutrality, the low-carbon manufacturing technology path of "carbon emissions accounting, carbon emissions diagnosis and carbon emissions reduction" based on the new generation of information technologies such as industrial internet and big data has been proposed, accordingly the industrial carbon emissions big data platform has also been established. Reference | Related Articles | Metrics | Comments（0）

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Life Cycle Assessment of Lithium-ion Batteries for Carbon-peaking and Carbon-neutrality: Framework, Methods, and Progress LAI Xin, CHEN Quan-wei, GU Huang-hui, HAN Xue-bing, ZHENG Yue-jiu Journal of Mechanical Engineering    2022, 58 (22): 3-18.   DOI: 10.3901/JME.2022.22.003 Abstract （880）      PDF（pc） （52919KB）（1096）       Knowledge map    Save Driven by the Carbon-peaking and Carbon-neutrality strategic goals, lithium-ion batteries usher in significant development opportunities. Meanwhile, it has become a research hotspot for tracking the life cycle carbon footprint and environmental indicators assessment and faced severe challenges in carbon emission calculation and reduction measures. First, the basic framework, methods,evaluation indicators, and other common problems of the life cycle assessment are briefly summarized. Then, a whole life cycle closed-loop assessment route from "cradle" to "cradle" is proposed for the sustainable development of lithium-ion batteries. The research progress of carbon emission calculation at all stages of the battery life cycle(including battery production, battery use,echelon utilization, battery recycling, and remanufacture) is summarized in detail, the potential research hotspots and difficulties are generalized, and a comprehensive evaluation framework of "Technology-Ecology-Value" is proposed. The opportunities and challenges in lithium-ion batteries' life cycle value assessment are discussed, and the resource and supply chain risks are analyzed.Finally, six potential carbon reduction measures for the whole life cycle of lithium-ion batteries are summarized and prospected, such as energy decarbonization, system innovation, intelligent manufacturing, optimization management, material recovery, and carbon capture. Reference | Related Articles | Metrics | Comments（0）

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Novel Collaborative Mode of Lifecycle Value Chain for Nuclear Power Equipment HU Bingtao, FENG Yixiong, MI Shanghua, ZHAO Zetian, SI Hengyuan, LEI Weijian, TAN Jianrong Journal of Mechanical Engineering    2022, 58 (13): 213-227.   DOI: 10.3901/JME.2022.13.213 Abstract （372）      PDF（pc） （1389KB）（302）       Knowledge map    Save On the basis of summarizing nuclear power equipment's characteristics of high safety requirements, long service period and giant system, the differences between the value chain and the industrial chain of nuclear power equipment are analyzed. It is pointed out that the lifecycle value chain for nuclear power equipment is multi-core and multi-stage, and the cooperative participants of the value chain at each stage can be divided into leading enterprises, follow-up enterprises and participating enterprises. The shortcomings of the existing value chain of nuclear power equipment are summarized. A lifecycle value chain synergy system oriented to nuclear power equipment is put forward to meet the horizontal penetration and vertical linkage requirements, in which forward-inverse synergy, spatio-temporal synergy and virtual-real synergy methods are used to promote traceability of quality control, credibility of data representation and controllability of object management, respectively. The operation mechanism of the lifecycle value chain for nuclear power equipment is elaborated, which is characterized by the integration and mutual influence of theoretical research and engineering practice. The key technologies and software components involved are also summarized. A collaborative management and control platform for lifecycle value chain has been built and preliminarily applied for nuclear power equipment, providing a model reference for the value chain collaboration of small-batches multiple-variety complex products. Reference | Related Articles | Metrics | Comments（0）

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Review of the Remanufacturability Evaluation of Mechanical Equipment WANG Jinlong, GAO Sibo, YANG Yuxing, BAO Yongjie, ZHANG Yuanliang Journal of Mechanical Engineering    2022, 58 (3): 221-234.   DOI: 10.3901/JME.2022.03.221 Abstract （665）      PDF（pc） （743KB）（767）       Knowledge map    Save Remanufacturability evaluation is an important part of remanufacturing engineering of mechanical equipment, which is related to whether remanufacturing objects can be remanufactured and the service safety of remanufactured products. Many challenges exist in the remanufacturability evaluation due to the particularity of mechanical equipment remanufacturing. Due to the particularity of remanufacturing of mechanical equipment, remanufacturability evaluation faces many challenges. The characteristics of remanufacturability evaluation are introduced, and the status of remanufacturability evaluation study is described in detail. The remanufacturability evaluation methods and basic scientific issues of remanufacturability evaluation are summarized and discussed. This study also analyzes the existing problems and difficulties of remanufacturability evaluation, points out the development trend, and provides reference research direction for enriching remanufacturability evaluation research in the future. Reference | Related Articles | Metrics | Comments（0）