It is widely known that the hypervelocity impact of orbital debris can cause serious damage to spacecraft,and enhancing the impact resistance is the great concern of spacecraft shield design.This paper provides a comp...It is widely known that the hypervelocity impact of orbital debris can cause serious damage to spacecraft,and enhancing the impact resistance is the great concern of spacecraft shield design.This paper provides a comprehensive overview of advances in the development of bumper materials for spacecraft shield applications.In particular,the protective mechanism and process of the bumper using different materials against hypervelocity impact are reviewed and discussed.The advantages and disadvantages of each material used in shield were discussed,and the performance under hypervelocity impact was given according to the specific configuration.This review provides the useful reference and basis for researchers and engineers to create bumper materials for spacecraft shield applications,and the contemporary challenges and future directions for bumper materials for spacecraft shield were presented.展开更多
Selection of materials,as an area of design research,has been under considerable interest over the years.Materials selection is one of the most important activities in the product development process.Inappropriate dec...Selection of materials,as an area of design research,has been under considerable interest over the years.Materials selection is one of the most important activities in the product development process.Inappropriate decision of materials can cause the product to be reproduced or remanufactured.To avoid this circumstance,one of the useful tools that can be employed in determining the most appropriate material is analytical hierarchy process(AHP).To illustrate the application of AHP,six different types of composite materials were considered.The most appropriate one for suitability of use in manufacturing automotive bumper beam was determined by considering eight main selection factors and 12 sub-factors.The AHP analysis reveals that the glass fibre epoxy is the most appropriate material because it has the highest value(25.7%,mass fraction) compared with other materials.The final material is obtained by performing six different scenarios of the sensitivity analysis.It is proved that glass fibre epoxy is the most optimum decision.展开更多
为提高林业运输车辆的保险杠喷涂合格率,以某公司汽车保险杠的涂装质量数据为例,运用排列图对涂装质量数据进行分析得出颗粒、桔皮属于影响喷涂质量的主要因素。从人、机、料、法、环5个方面分析产生颗粒、桔皮的主要原因,并采用斯皮尔...为提高林业运输车辆的保险杠喷涂合格率,以某公司汽车保险杠的涂装质量数据为例,运用排列图对涂装质量数据进行分析得出颗粒、桔皮属于影响喷涂质量的主要因素。从人、机、料、法、环5个方面分析产生颗粒、桔皮的主要原因,并采用斯皮尔曼(Spearman)相关系数进行特征提取以及重要性分析,得出喷漆房的温度、喷漆房相对湿度、机器人喷涂流量、旋杯转速、喷涂距离、喷涂速度、漆的品牌、机器人(机器①、机器②、…、机器⑥)均会影响保险杠的喷涂质量。运用决策树(classification and regression tree,CART)算法确定喷涂流量、喷漆房的温度、喷漆房相对湿度、机器人②和机器人④、漆的品牌是影响保险杠喷涂质量的较为关键的因素。结果表明,利用CART分类算法对喷涂质量数据进行分析能够实现对故障点的判别,对于提高保险杠喷涂质量具有借鉴意义。展开更多
基金supported by National Natural Science Foundation of China(Grant Nos.12202068,12202087)China National Space Administration Preliminary Research Project(Grant Nos.KJSP2023020201,KJSP2020010402).
文摘It is widely known that the hypervelocity impact of orbital debris can cause serious damage to spacecraft,and enhancing the impact resistance is the great concern of spacecraft shield design.This paper provides a comprehensive overview of advances in the development of bumper materials for spacecraft shield applications.In particular,the protective mechanism and process of the bumper using different materials against hypervelocity impact are reviewed and discussed.The advantages and disadvantages of each material used in shield were discussed,and the performance under hypervelocity impact was given according to the specific configuration.This review provides the useful reference and basis for researchers and engineers to create bumper materials for spacecraft shield applications,and the contemporary challenges and future directions for bumper materials for spacecraft shield were presented.
基金the financial support through Research University Grant Scheme 2007 (RUG 2007) with vote number 91045
文摘Selection of materials,as an area of design research,has been under considerable interest over the years.Materials selection is one of the most important activities in the product development process.Inappropriate decision of materials can cause the product to be reproduced or remanufactured.To avoid this circumstance,one of the useful tools that can be employed in determining the most appropriate material is analytical hierarchy process(AHP).To illustrate the application of AHP,six different types of composite materials were considered.The most appropriate one for suitability of use in manufacturing automotive bumper beam was determined by considering eight main selection factors and 12 sub-factors.The AHP analysis reveals that the glass fibre epoxy is the most appropriate material because it has the highest value(25.7%,mass fraction) compared with other materials.The final material is obtained by performing six different scenarios of the sensitivity analysis.It is proved that glass fibre epoxy is the most optimum decision.
文摘为提高林业运输车辆的保险杠喷涂合格率,以某公司汽车保险杠的涂装质量数据为例,运用排列图对涂装质量数据进行分析得出颗粒、桔皮属于影响喷涂质量的主要因素。从人、机、料、法、环5个方面分析产生颗粒、桔皮的主要原因,并采用斯皮尔曼(Spearman)相关系数进行特征提取以及重要性分析,得出喷漆房的温度、喷漆房相对湿度、机器人喷涂流量、旋杯转速、喷涂距离、喷涂速度、漆的品牌、机器人(机器①、机器②、…、机器⑥)均会影响保险杠的喷涂质量。运用决策树(classification and regression tree,CART)算法确定喷涂流量、喷漆房的温度、喷漆房相对湿度、机器人②和机器人④、漆的品牌是影响保险杠喷涂质量的较为关键的因素。结果表明,利用CART分类算法对喷涂质量数据进行分析能够实现对故障点的判别,对于提高保险杠喷涂质量具有借鉴意义。
