Remanufacturing route optimization is crucial in remanufacturing production because it exerts a considerable impact on the eco-efficiency(i.e.,the best link between economic and environmental benefits)of remanufacturi...Remanufacturing route optimization is crucial in remanufacturing production because it exerts a considerable impact on the eco-efficiency(i.e.,the best link between economic and environmental benefits)of remanufacturing.Therefore,an optimization model for remanufacturing process routes oriented toward eco-efficiency is proposed.In this model,fault tree analysis is used to extract the characteristic factors of used products.The ICAM definition method is utilized to design alternative remanufacturing process routes for the used products.Afterward,an eco-efficiency objective function model is established,and simulated annealing(SA)particle swarm optimization(PSO)is applied to select the manufacturing process route with the best eco-efficiency.The proposed model is then applied to the remanufacturing of a used helical cylindrical gear,and optimization of the remanufacturing process route is realized by MATLAB programming.The proposed model’s feasibility is verified by comparing the model’s performance with that of standard SA and PSO.展开更多
The relationship between processing route and suspension stability in ZrO2-H2O-PANH4 system was investigated through rheology study. The work showed that two suspensions with identical PAN H4 concentration and final s...The relationship between processing route and suspension stability in ZrO2-H2O-PANH4 system was investigated through rheology study. The work showed that two suspensions with identical PAN H4 concentration and final solution condition but prepared by different routes differed greatly in stability. This behavior is attributed to their different distribution state of PANH4 on ZrO2 surface that is determined by the adsorption affinity depending on pH condition in solution. High affinity at pH 5.0 induces a nonuniform distribution of soluble PAA- (polyacrylicacid) on particle surface, which can flocculate the suspension strongly, while low affinity at pH 9.0 induces an uniform distribution of polymer so that the higher stabilization can be achieved. A simple mathematical model was used to account for the observed results.展开更多
Porous ceramic composites with directional microchannels from micrometer to dozens of micrometer levels have attracted more and more attention in various fields including aerospace,biomedicines,and thermal insulation ...Porous ceramic composites with directional microchannels from micrometer to dozens of micrometer levels have attracted more and more attention in various fields including aerospace,biomedicines,and thermal insulation due to their excellent fluid permeability,mechanical properties,etc.In this article,we summarize the recent directional porous ceramics developments including their main processing routes and respective properties.Meanwhile,the properties get from different processing routes have been com-pared and analyzed in terms of microstructures,mechanical properties,and permeability.Emphasis has been given to the deeper understanding which can allow one to control the microstructural features of these porous ceramic composites to obtain the desired characteristics.This work can provide a useful reference for the development and application of porous ceramic composites with directional microchan-nels.展开更多
The selection of process planning methods during production influences the enterprise's production process planning performance with determination of the process flow as the most important influencing factor. A new p...The selection of process planning methods during production influences the enterprise's production process planning performance with determination of the process flow as the most important influencing factor. A new production process determining method that focuses on sustainable manufacturing was developed based on case-based reasoning, expert systems, and feature technology for designing the process flow of a new component. This study matches a new component with preview case process information, modifies the case process information if necessary, and selects the process flow for the new component based on a sustainable development assessment according to the similarities between the case and the sustainable development characteristics. The feasibility and practicability of the method is verified by a case study of a machining process flow design for a new component.展开更多
Medium-manganese(Mn)steel(MMS)has remarkable characteristics of high strength,strong work-hardening capacity,and wear resistance,being a promising third-generation advanced high-strength steel with lower raw material ...Medium-manganese(Mn)steel(MMS)has remarkable characteristics of high strength,strong work-hardening capacity,and wear resistance,being a promising third-generation advanced high-strength steel with lower raw material cost compared with other generations of advanced high-strength steel.The chemical composition and processing route play critical roles in determining the microstructural evolution of the MMS,and the microstructure composition significantly influences the mechanical,corrosion and wear properties of the steel.Hence,a lot of research work focus on exploring the direct relation between microstructural evolution and mechanical/corrosion/wear properties,and the progress has the following crucial aspects:(1)alloying design on the phase composition and carbide precipitation,(2)processing route on regulating microstructure evolution and twinning-induced plasticity and/or transformation-induced plasticity strengthening mechanism,(3)work-hardening,corrosion,and corrosion resistance of the regulated MMS,and(4)fracture and failure mechanism of MMS under tensile,corrosion and wear damages,as well as the improvement strategies.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant No.51675388)The authors sincerely thank the reviewers and editors for their comments and suggestions.
文摘Remanufacturing route optimization is crucial in remanufacturing production because it exerts a considerable impact on the eco-efficiency(i.e.,the best link between economic and environmental benefits)of remanufacturing.Therefore,an optimization model for remanufacturing process routes oriented toward eco-efficiency is proposed.In this model,fault tree analysis is used to extract the characteristic factors of used products.The ICAM definition method is utilized to design alternative remanufacturing process routes for the used products.Afterward,an eco-efficiency objective function model is established,and simulated annealing(SA)particle swarm optimization(PSO)is applied to select the manufacturing process route with the best eco-efficiency.The proposed model is then applied to the remanufacturing of a used helical cylindrical gear,and optimization of the remanufacturing process route is realized by MATLAB programming.The proposed model’s feasibility is verified by comparing the model’s performance with that of standard SA and PSO.
文摘The relationship between processing route and suspension stability in ZrO2-H2O-PANH4 system was investigated through rheology study. The work showed that two suspensions with identical PAN H4 concentration and final solution condition but prepared by different routes differed greatly in stability. This behavior is attributed to their different distribution state of PANH4 on ZrO2 surface that is determined by the adsorption affinity depending on pH condition in solution. High affinity at pH 5.0 induces a nonuniform distribution of soluble PAA- (polyacrylicacid) on particle surface, which can flocculate the suspension strongly, while low affinity at pH 9.0 induces an uniform distribution of polymer so that the higher stabilization can be achieved. A simple mathematical model was used to account for the observed results.
基金supported by the National Science and Technol-ogy Major Project(No.J2019-IV-0003-0070)the National Natural Science Foundation of China(Grant No.12202343)the China Postdoctoral Science Foundation(No.2021M702582).
文摘Porous ceramic composites with directional microchannels from micrometer to dozens of micrometer levels have attracted more and more attention in various fields including aerospace,biomedicines,and thermal insulation due to their excellent fluid permeability,mechanical properties,etc.In this article,we summarize the recent directional porous ceramics developments including their main processing routes and respective properties.Meanwhile,the properties get from different processing routes have been com-pared and analyzed in terms of microstructures,mechanical properties,and permeability.Emphasis has been given to the deeper understanding which can allow one to control the microstructural features of these porous ceramic composites to obtain the desired characteristics.This work can provide a useful reference for the development and application of porous ceramic composites with directional microchan-nels.
基金Supported by the National Natural Science Foundation of China (No. 50205015), the Beijing Natural Science Foundation (No. 4031001-2), and the Key Laboratory of Intelligent Manufacturing System Foundation (No. Imtsu-2002-10)
文摘The selection of process planning methods during production influences the enterprise's production process planning performance with determination of the process flow as the most important influencing factor. A new production process determining method that focuses on sustainable manufacturing was developed based on case-based reasoning, expert systems, and feature technology for designing the process flow of a new component. This study matches a new component with preview case process information, modifies the case process information if necessary, and selects the process flow for the new component based on a sustainable development assessment according to the similarities between the case and the sustainable development characteristics. The feasibility and practicability of the method is verified by a case study of a machining process flow design for a new component.
基金supported by the Innovation and Technology Fund(ITF)(ITP/020/20AP)the National Key Research and Development Program of China(2021YFB3701704)+2 种基金the Guangdong Academy of Sciences(GDAS)Project of Science and Technology Development(2022GDASZH-2022010103)Jiangxi Science and Technology Plan Project(S2020CXTD0356)the Young Talent Support Project of Guangzhou Association for Science and Technology(QT20220101075)。
文摘Medium-manganese(Mn)steel(MMS)has remarkable characteristics of high strength,strong work-hardening capacity,and wear resistance,being a promising third-generation advanced high-strength steel with lower raw material cost compared with other generations of advanced high-strength steel.The chemical composition and processing route play critical roles in determining the microstructural evolution of the MMS,and the microstructure composition significantly influences the mechanical,corrosion and wear properties of the steel.Hence,a lot of research work focus on exploring the direct relation between microstructural evolution and mechanical/corrosion/wear properties,and the progress has the following crucial aspects:(1)alloying design on the phase composition and carbide precipitation,(2)processing route on regulating microstructure evolution and twinning-induced plasticity and/or transformation-induced plasticity strengthening mechanism,(3)work-hardening,corrosion,and corrosion resistance of the regulated MMS,and(4)fracture and failure mechanism of MMS under tensile,corrosion and wear damages,as well as the improvement strategies.