The debris cloud generated by the hypervelocity impact(HVI)of orbiting space debris directly threatens the spacecraft.A full understanding of the damage mechanism of rear plate is useful for the optimal design of prot...The debris cloud generated by the hypervelocity impact(HVI)of orbiting space debris directly threatens the spacecraft.A full understanding of the damage mechanism of rear plate is useful for the optimal design of protective structures.In this study,the hypervelocity yaw impact of a cylindrical aluminum projectile on a double-layer aluminum plate is simulated by the FE-SPH adaptive method,and the damage process of the rear plate under the impact of the debris cloud is analyzed based on the debris cloud structure.The damage process can be divided into the main impact stage of the debris cloud and the structural response of the rear plate.The main impact stage lasts a short time and is the basis of the rear plate damage.In the stage of structure response,the continuous deformation and inertial motion of the rear plate dominate the perforation of the rear plate.We further analyze the damage mechanism and damage distribution characteristics of the rear plate in detail.Moreover,the connection between velocity space and position space of the debris cloud is established,which promotes the general analysis of the damage law of debris cloud.Based on the relationship,the features of typical damage areas are identified by the localized fine analysis.Both the cumulative effect and structural response cause the perforation of rear plate;in the non-perforated area,cratering by the impact of hazardous fragments is the main damage mode of the rear plate.展开更多
High voltage safety is very important for electric vehicles, how to ensure the passengers’ safety in traffic accidents is animportant research subject. This paper describes a study of the high-voltage safety of an el...High voltage safety is very important for electric vehicles, how to ensure the passengers’ safety in traffic accidents is animportant research subject. This paper describes a study of the high-voltage safety of an electric vehicle under rear impactconditions to ensure that it is in accordance with Chinese regulations. The high-voltage safety has been analyzed and optimizedfrom several perspectives and includes the development of a high-voltage cutoff strategy, assessment of the integrity of thehigh-voltage components after the crash, the layout of the high-voltage and low-voltage cables, and the crashworthiness ofthe structure. This study resolved the high-voltage safety problems that were found in the design phase and thus ensured thatthe vehicle not only meets the requirements of the Chinese regulations, but also meets the high-voltage safety requirementsof US Federal Motor Vehicle Safety Standard (FMVSS) 305 for 80 km/h rear impact.展开更多
为了减少追尾事故中所造成的乘员颈部伤害,以2015版C-NCAP鞭打试验动态评估作为标准,利用仿真软件结合试验设计(Design of Experiment,DOE)优化方法对影响座椅颈部伤害指标的各个特征参数进行了研究,并对一款量产车型座椅进行追尾碰撞...为了减少追尾事故中所造成的乘员颈部伤害,以2015版C-NCAP鞭打试验动态评估作为标准,利用仿真软件结合试验设计(Design of Experiment,DOE)优化方法对影响座椅颈部伤害指标的各个特征参数进行了研究,并对一款量产车型座椅进行追尾碰撞鞭打试验。结合仿真分析所得结论对这款座椅的影响参数进行调整修正,降低鞭打试验中的乘员伤害值,满足得分3.5分的性能要求。展开更多
基金supported by the Innovative Research Groups of the National Natural Science Foundation of China(Grant No.12221002)。
文摘The debris cloud generated by the hypervelocity impact(HVI)of orbiting space debris directly threatens the spacecraft.A full understanding of the damage mechanism of rear plate is useful for the optimal design of protective structures.In this study,the hypervelocity yaw impact of a cylindrical aluminum projectile on a double-layer aluminum plate is simulated by the FE-SPH adaptive method,and the damage process of the rear plate under the impact of the debris cloud is analyzed based on the debris cloud structure.The damage process can be divided into the main impact stage of the debris cloud and the structural response of the rear plate.The main impact stage lasts a short time and is the basis of the rear plate damage.In the stage of structure response,the continuous deformation and inertial motion of the rear plate dominate the perforation of the rear plate.We further analyze the damage mechanism and damage distribution characteristics of the rear plate in detail.Moreover,the connection between velocity space and position space of the debris cloud is established,which promotes the general analysis of the damage law of debris cloud.Based on the relationship,the features of typical damage areas are identified by the localized fine analysis.Both the cumulative effect and structural response cause the perforation of rear plate;in the non-perforated area,cratering by the impact of hazardous fragments is the main damage mode of the rear plate.
文摘High voltage safety is very important for electric vehicles, how to ensure the passengers’ safety in traffic accidents is animportant research subject. This paper describes a study of the high-voltage safety of an electric vehicle under rear impactconditions to ensure that it is in accordance with Chinese regulations. The high-voltage safety has been analyzed and optimizedfrom several perspectives and includes the development of a high-voltage cutoff strategy, assessment of the integrity of thehigh-voltage components after the crash, the layout of the high-voltage and low-voltage cables, and the crashworthiness ofthe structure. This study resolved the high-voltage safety problems that were found in the design phase and thus ensured thatthe vehicle not only meets the requirements of the Chinese regulations, but also meets the high-voltage safety requirementsof US Federal Motor Vehicle Safety Standard (FMVSS) 305 for 80 km/h rear impact.
文摘为了减少追尾事故中所造成的乘员颈部伤害,以2015版C-NCAP鞭打试验动态评估作为标准,利用仿真软件结合试验设计(Design of Experiment,DOE)优化方法对影响座椅颈部伤害指标的各个特征参数进行了研究,并对一款量产车型座椅进行追尾碰撞鞭打试验。结合仿真分析所得结论对这款座椅的影响参数进行调整修正,降低鞭打试验中的乘员伤害值,满足得分3.5分的性能要求。
