Response of carbon fiber trapezoidal corrugated sandwich structure under air explosion loading北大核心CSCD

The effects of the thickness of the face plate, angle of the wall plate and height of the core layer on the anti-explosion performance of carbon fiber reinforced composite trapezoidal corrugated sandwich structures were investigated. [Methods]First, based on the 3D Hashin failure criterion, a subroutine module of the damage evolution of fiber reinforced composites is developed using the VUMAT user subroutine interface in ABAQUS. Second, through comparison with experiments in the public literature, the effectiveness of the dynamic response simulation method of carbon fiber reinforced composites based on a development subroutine under explosion impact loading is verified. Finally, a parametric study on the explosion resistance of carbon fiber reinforced composite trapezoidal corrugated plates is carried out based on the numerical method. [Results]The results show that, compared with increasing the thickness of the blast face panel, increasing the thickness of the back blast face panel can improve the explosion resistance of the sandwich plate more obviously; when the folding angle of the core wall plate decreases from 45° to 30°, the explosion resistance increases by 1.3%; when it decreases from 60° to 45°, the explosion resistance increases by 6.3%; and whenthecoreheightincreasesfrom8mmto20mm, theexplosionresistanceincreasesby27.7%.[Conclusions]The results of this study can provide references for the explosion-proof design of carbon fiber reinforced composite sandwich structures. © 2023 Journal of Nanjing Agricultural University. All rights reserved.     

基于AHP-广义模糊软集的列车运行图评价

本文从列车速度、服务水平、鲁棒性、弹性及列车运行水平5个方面，构建列车运行图质量评价指标体系，通过AHP计算各指标权重，构建广义模糊软集模型确定列车运行图综合得分系数,实现列车运行图编制质量评估。为了对算法效果进行验证，以徐盐、连淮铁路网络中京沪高铁南京南至徐州东段、徐兰高铁徐州东至商丘郑徐场段、青盐铁路青岛北至连云港段三条线路为例进行运行图质量评价。结果表明,京沪高铁南京南至徐州东段的运行图综合质量最好，青盐铁路青岛北至连云港段运行图综合质量最差。     

订单生成时间不确定的货物配送路径优化

针对各个配送点订单生成时间不确定，且未来生成订单现阶段配送方案制定有影响，本文提出了动态订单匹配策略，将已生成和未生成的订单信息综合考虑，提高匹配效果。然后，本文建立了以最小化运能浪费和订单等待处理时间为目标的二阶段随机规划模型来编制当前和下一阶段的配送方案，并设计了自适应遗传算法进行求解。最后，本文利用某地25个配送点数据信息进行二阶段配送路径规划。与蚁群算法相比，本文算法对两个阶段的运能浪费成本和时间浪费成本求解过程收敛时间分别为：112.3s、102.4s、98.5s、114.7s，均小于蚁群算法收敛时间：117.3s、115.4s、109.6s、118.2s。且本文算法求得的两个阶段总运能浪费成本和时间浪费成本分别为62000t.km、644t.h，远小于传统启发式算法的72400t.km、816t.h。     

基于正面碰撞试验的Q3假人用儿童约束系统研究

为了研究儿童约束系统（Children Restraint System, CRS）在C-NCAP2021版规程中正面100%重叠率碰撞工况下的安全保护性能，本文通过台车和实车碰撞试验，分别研究了五点式正向CRS、前置护体型CRS和五点式后向CRS对Q3儿童假人的保护性能。研究表明，不同类型的CRS由于安装及约束方式不同，在碰撞过程中的动态性能有较大差异，五点式正向CRS对儿童头部颈部损伤较大，前置护体型CRS对于儿童腹部损伤较大，五点式后向CRS受到车辆空间影响较大。希望本研究对我国儿童乘员安全保护研究工作提供参考。