改型解放牌汽车转向节主销衬套孔精密镗削试验研究

本文研究了刀具材料及其几何参数的选择、被加工表面粗糙度的影响、刀具耐用度的选择以及切削用量的优化方法,藉以评定锡黄铜(Hsn90-1)板材的切削加工性,也为精密加工衬套孔用组合机床的设计,提供了最佳工艺参数.     

产教融合对促进中职学校教学模式创新的研究

我国在进入新发展阶段后,社会经济建设对职业教育领域提出了新的任务和要求,如何更好地推进产教融合,创新中职教学模式,构建现代化新型职业教育体系,是一项迫切需要解决的课题。本文首先对产教融合的特点和重要性进行阐述,之后对中职学校目前教学模式存在的问题进行分析,结合产教融合的改革路径,以提高中职人才培养质量为目标,探讨了优化改进教学模式的对策和建议,倡导中职教学朝着内涵式发展的道路加强探索和实践。     

管子智能生产线数字化管理系统设计

为实现管子生产过程的智能化,设计一种高效的管子智能生产线数字化管理系统。涉及企业ERP系统、船舶中日程计划排程系统、供应链系统、车间MES系统、高级排程APS系统、设备监控SCADA系统、立体库管理WMS系统、车间拉料LES系统等先进的信息化管理系统,配合先进的生产设备和合理的生产线布置,可以有效节约生产成本,提高车间的生产效率,成为管子智能化生产的最佳示范车间,具有广阔的实际应用前景。     

京沪高速铁路CRTS Ⅱ型轨道板预制生产线设计研究

结合固镇轨道板场建厂经验,从预制车间厂房设计、张拉台座设计、机械设备配置、供水、采暖、电器、供气等方面对CRTS Ⅱ型轨道板2×42预制生产线的设计进行介绍。     

TransCAD在地区客运规划中的应用

结合新疆生产建设兵团客运规划的实际情况，研究了TransCAD在地区客运规划中的运用，详细介绍了在已知基年交通分布和经济指标的情况下，建立交通产生量与经济指标的回归模型，进而预测出交通产生量、交通分布和交通分配。     

Optimization of mooring systems in the context of an integrated design methodology

This work describes an enhanced mooring optimization procedure, oriented towards recent floating production systems (FPS) for oil & gas exploitation in ultra-deep-water scenarios, which may present a large number of risers in an asymmetric layout. Acknowledging that the risers are the key component of an FPS, the optimization procedure is associated to an integrated mooring-riser design methodology; thus, instead of simply minimizing the platform offsets and/or the costs of the mooring system itself, one of the main objectives is to obtain a mooring configuration that ensures the integrity of the risers. Other highlights of the optimization procedure include the following aspects: Enhancements in the modeling of the optimization problem (including the definition of design variables, objective function and constraints that are relevant for such actual applications); The use of the PSO optimization algorithm associated to the ε-constrained method to efficiently handle the constraints; Enhancements in the evaluation of candidate solutions, by full nonlinear time-domain dynamic Finite Element simulations with coupled models; and the implementation in a parallel computing environment to deal with the high associated computational costs. A case study considering an FPS representative of actual applications in deepwater scenarios is presented to illustrate the practical application of the optimization tool.     

An efficient FE computation for predicting welding induced buckling in production of ship panel structure

In a Thermal-Elastic-Plastic (TEP) FE analysis to investigate welding induced buckling of large thin plate welded structure such as ship panel, it will be extremely difficult to converge computation and obtain the results when the material and geometrical non-linear behaviors are both considered. In this study, an efficient FE computation which is an elastic FE analysis based on inherent deformation method, is proposed to predict welding induced buckling with employing large deformation theory, and an application in ship panel production is carried out. The proposed FE computation is implemented with two steps:(1) The typical weld joint (fillet weld) existing in considered ship panel structure is conducted with sequential welding using actual welding condition, and welding angular distortion after completely cooling down is measured. A TEP FE analysis with solid elements model is carried out to predict the welding angular distortion, which is validated by comparing with experimental results. Then, inherent deformations in this examined fillet welded joint are evaluated as a loading for the subsequent elastic FE analysis. Also, the simultaneous welding to assemble this fillet welded joint is numerically considered and its inherent deformations are evaluated.(2) To predict the welding induced buckling in the production of ship panel structure, a shell element model of considered ship panel is then employed for elastic FE analysis, in which inherent deformation evaluated beforehand is applied and large deformation is considered. The computed results obviously show welding induced buckling in the considered ship panel structure after welding. With its instability and difficulty for straightening, welding induced buckling prefers to be avoided whenever it is possible.     

Effects of corruption on efficiency of the European airports

The effect of corruption on airport productive efficiency is analyzed using an unbalanced panel data of major European airports from 2003 to 2009. We first compute the residual (or net) variable factor productivity using the multilateral index number method and then apply robust cluster random effects model in order to evaluate the importance of corruption. We find strong evidence that corruption has negative impacts on airport operating efficiency; and the effects depend on the ownership form of the airport. The results suggest that airports under mixed public–private ownership with private majority achieve lower levels of efficiency when located in more corrupt countries. They even operate less efficiently than fully and/or majority government owned airports in high corruption environment. We control for economic regulation, competition level and other airports’ characteristics. Our empirical results survive several robustness checks including different control variables, three alternative corruption measures: International Country Risk Guide (ICRG) corruption index, Corruption Perception Index (CPI) and Control of Corruption Index (CCI). The empirical findings have important policy implications for management and ownership structuring of airports operating in countries that suffer from higher levels of corruption.     

基于产品数据库管理系统的工艺标准化管理

阐述现代大中型制造型企业在产品数据库管理系统下的工艺标准化和现代化管理的方法,以及企业信息化管理模式下如何搞好标准化工作。