普通平车运输100m长钢轨的车辆承重仿真研究

以换长为1.5的普通平车运输100m长钢轨的装载加固方案为例,运用大型有限元分析软件ANSYS,建立考虑车辆中央悬挂和相邻车辆高差的车辆承重有限元仿真模型,计算典型工况下车辆载重、车辆转向架承重和车辆转向架承重差。仿真结果表明,车辆的各项承重指标满足《铁路货物装载加固规则》技术要求,并通过了运输试验验证。     

提高榆次站运输能力的对策

榆次站位于石太、太焦、同蒲、太中银4条铁路干线的交汇处,通过分析榆次站运输组织现状,指出存在的问题,提出合理分配编组站工作量,调整列车编组计划;优化机车交路,提高机车使用效率;优化列检人员配置,合理调整作业流程;优化调度指挥,合理调整列车运行计划;加快设备技术改造,适应增量运输形势等措施,有效提高榆次站的运输能力。     

某轻型客车轮毂轴承的匹配计算

某汽车厂家为迎合市场需求,开发了一款轻型客车。该车型在试验场路试过程中,发生了两起前轮毂轴承烧蚀问题。本文针对该问题,运用理论计算、CAE分析,并结合试验,制定相关措施,优化设计轮毂轴承。     

Centrifuge performance of LCSM wall reinforced pile-supported wharf subjected to yard load-induced marine slope soil movement

Lattice cement soil mixing (LCSM) walls are constructed to relief the marine slope soil movement that will trigger failure of the pile-supported wharf, the structural performance and pile-soil interactions after the LCSM implementation are major concerns. This paper investigated motion modes, load-displacement relations, soil and pore pressures, and bending moments of pile-supported wharfs with LCSM walls subjected to yard load-induced slope soil movement via centrifuge modeling. Results showed that the LCSM wall tilted to compress the soil and pile, inducing the tilting of the wharf. The lateral structural displacement was effectively restricted by the LCSM wall compared with that of a nonreinforced wharf, but the LCSM wall was not superior to the other lattice wall type with legs in limiting the lateral structural displacement, and the deep LCSM wall worked better at larger soil movement. The rear piles were evidently affected by slope soil movement and were compressed in the middle part. Soil pressures generally increased with increasing yard loads, whereas their distributions were deeply affected by different LCSM wall depths. Pore pressures were greater around the tilting LCSM wall because of larger soil shear areas but dissipated when soil movement stopped. Bending moment distributions indicated evident waterside curvatures in rear piles, whereas waterside curvatures occurred in the upper part and landside curvatures occurred in the lower part in front and middle piles, the effects of LCSM wall types and depth on bending moment distributions were tremendous.     

Capacity and failure mechanism of monopile-wheel hybrid foundation in clay-overlaying-sand deposits under combined V–H-M loadings

Innovative monopile-wheel hybrid foundations are proposed to enhance the lateral load and moment capacities of monopile for offshore wind systems. This paper presents a comprehensive numerical study on the bearing capacities of this hybrid foundation in clay-overlaying-sand soil conditions under combined V–H-M (vertical-horizontal-moment) loadings. Numerical models are generated and validated by comparing with laboratory experiment results and available centrifuge testing data on similar foundation systems. Parametric analysis is then carried out to quantify the effects of potential influencing factors on the failure mechanisms and bearing capacities of hybrid foundations, including the hybrid foundation geometry, soil properties, upper clay thickness, height of the lateral loading and pre-vertical load. It is found that in clay-overlaying-sand deposits, the hybrid system manifests totally different failure mechanism compared with that in uniform soil deposits. The thickness of the upper clay layer (T_c/L), within the practical range of T_c/L = 0.1–0.7, has a significant influence on the failure patterns and the bearing capacities of the hybrid system, and the proportion of bearing capacity provided by the pile and wheel is determined by the ratios of D_w/L and L/D_p. In addition, the failure envelopes in the V–H-M space manifests that the failure envelopes are shrank with the increase of the normalized vertical resistance, V/V_ult, which is highly related to the clay layer thickness (T_c/L).