With the development of composite materials,their lightweight and high-strength characteristics have caused more widespread use from aerospace applications to automotive and rail transportation sectors,significantly r...With the development of composite materials,their lightweight and high-strength characteristics have caused more widespread use from aerospace applications to automotive and rail transportation sectors,significantly reducing the energy consumption during the operation of EMUs(Electric Multiple Units).This study aims to explore the application of composite materials in the lightweight design of EMU front skirts and proposes a design method based on threedimensional Hashin failure criteria and the Cheetah Optimizer(CO)to achieve maximum lightweight efficiency.The UMAT subroutine was developed based on the three-dimensional Hashin failure criteria to calculate failure parameters,which were used as design parameters in the CO.The model calculations and result extraction were implemented in MATLAB,and the Cheetah Optimizer iteratively determined the optimal laminating angle design that minimized the overall failure factor.After 100 iterations,ensuring structural integrity,the optimized design reduced the weight of the skirt panel by 60% compared to the original aluminum alloy structure,achieving significant lightweight benefits.This study provides foundational data for the lightweight design of EMUs.展开更多
针对200km/h EMU铸钢轴箱体存在的缩松、裂纹铸造缺陷问题,采用铸造模拟软件MAG-MASOFT对铸件的充型、凝固过程进行了温度场、流场的模拟计算,获得了优化的轴箱体铸造工艺方案,消除了200 km/h EMU轴箱体惯性缩松及裂纹问题。优化的铸造...针对200km/h EMU铸钢轴箱体存在的缩松、裂纹铸造缺陷问题,采用铸造模拟软件MAG-MASOFT对铸件的充型、凝固过程进行了温度场、流场的模拟计算,获得了优化的轴箱体铸造工艺方案,消除了200 km/h EMU轴箱体惯性缩松及裂纹问题。优化的铸造工艺,其工艺稳定性好,批量生产铸件成品率达到了95%以上,大大降低了铸件的制造成本。展开更多
文摘With the development of composite materials,their lightweight and high-strength characteristics have caused more widespread use from aerospace applications to automotive and rail transportation sectors,significantly reducing the energy consumption during the operation of EMUs(Electric Multiple Units).This study aims to explore the application of composite materials in the lightweight design of EMU front skirts and proposes a design method based on threedimensional Hashin failure criteria and the Cheetah Optimizer(CO)to achieve maximum lightweight efficiency.The UMAT subroutine was developed based on the three-dimensional Hashin failure criteria to calculate failure parameters,which were used as design parameters in the CO.The model calculations and result extraction were implemented in MATLAB,and the Cheetah Optimizer iteratively determined the optimal laminating angle design that minimized the overall failure factor.After 100 iterations,ensuring structural integrity,the optimized design reduced the weight of the skirt panel by 60% compared to the original aluminum alloy structure,achieving significant lightweight benefits.This study provides foundational data for the lightweight design of EMUs.
文摘针对200km/h EMU铸钢轴箱体存在的缩松、裂纹铸造缺陷问题,采用铸造模拟软件MAG-MASOFT对铸件的充型、凝固过程进行了温度场、流场的模拟计算,获得了优化的轴箱体铸造工艺方案,消除了200 km/h EMU轴箱体惯性缩松及裂纹问题。优化的铸造工艺,其工艺稳定性好,批量生产铸件成品率达到了95%以上,大大降低了铸件的制造成本。
