某膨胀土边坡滑坡机理的研究

从实际工程出发,结合膨胀土边坡的特征,探讨了膨胀土边坡设计的一些原则,强调应针对工程特性进行相应的工程设计。     

生命周期评价及天然气基车用替代燃料的选择

介绍了生命周期评价方法在车用替代燃料选择方面的研究,通过实地考察我国天然气制甲醇联产二甲醚工艺,结合车辆技术,对天然气基代用燃料,包括压缩天然气、甲醇汽油、二甲醚的生命周期能量消耗和温室气体排放进行了评估,并与石油基燃料进行了比较,同时对燃料制备工艺与车辆技术进步所造成的影响进行了讨论。     

强化宗旨意识,凝聚发展力量——锦州公交运营二公司创建先进党总支事迹

为进一步加强基层党组织建设,激发广大党员昂扬向上的精神风貌,充分发挥示范带头作用,全力打造'文明公交、满意公交'品牌,锦州公交运营二公司党总支以'三城联创'党建促创城的工作为目标,以'责任赢得信赖、服务创造价值'为核心价值观,坚持提升企业品质和管理效能,系统地开展了服务型党组织建设活动。     

汽车转向系统低频共振研究

在汽车设计中,转向系统是底盘设计的重要部分。在整车NVH(Noise、Vibration、Harshness,噪声、振动与声振粗糙度)性能开发中,转向系统振动是一个重要的影响因素。转向系统由转向器、转向传动机构、转向操纵机构组成;转向操纵机构主要由转向盘、转向管柱、传动轴组成。转向系统的低频共振主要体现在转向盘共振,主要指车辆在怠速状态或者低速行驶时的转向盘振动。以某型轿车为例,对转向系统低频共振问题进行研究,提出相应的解决方案。     

规范水路货物运单的签发，防范无运单运输的风险

在国内水路货物运输中,水路货物运单是运输合同的证明,是承运人已经接收货物的收据。承运人接收货物应当签发运单。当事人在实践中却常常不遵守该规则,从而引发大量纠纷。笔者认为,国内水路货物运输的当事人双方应该严格遵照国内水路货物运输规则进行实务操作,规范水路货物运单的签发,以防范相应风险。     

不同尺寸对FCBGA元器件焊点可靠性有限元分析

采用有限元法对FCBGA器件焊点尺寸和焊点间距进行了优化模拟。研究发现,元器件整体的最大应力集中在阵列最拐角焊点的上表面上,该部位可能成为焊点裂纹的发源地。对焊点最大应力节点进行时间历程处理,发现应力松弛现象严重,且应力值随着温度循环加载具有累积迭加的趋势。焊点优化结果显示,焊点高度对应的应力值曲线具有明显的单调递减特性。模拟的焊点直径值和实际情况吻合,同时发现焊点直径为0.02mm时对应的应力值最小。焊点间距曲线单调性表现为单调递增性,因此,可以根据应力最小的原则来选择焊点尺寸。     

波能转换型浮式防波堤的水动力性能研究（英文）

The integration of wave energy converters(WECs) with floating breakwaters has become common recently due to the benefits of both cost-sharing and providing offshore power supply. In this study, based on viscous computational fluid dynamics(CFD) theory, we investigated the hydrodynamic performances of the floating box and Berkeley Wedge breakwaters, both of which can also serve as WECs. A numerical wave flume model is constructed using Star-CCM+software and applied to investigate the interaction between waves and wave energy converters while completing the verification of the convergence study of time and space steps. The effects of wave length on motion response and transmission coefficient of the floating box breakwater model are studied. Comparisons of our numerical results and published experimental data indicate that Star-CCM+ is very capable of accurately modeling the nonlinear wave interaction of floating structures, while the analytical potential theory overrates the results especially around the resonant frequency. Optimal damping can be readily predicted using potential flow theory and can then be verified by CFD numerical results. Next, we investigated the relationship between wave frequencies and various coefficients using the CFD model under optimal damping, including the motion response, transmission coefficient, reflection coefficient,dissipation coefficient, and wave energy conversion efficiency. We then compared the power generation efficiencies and wave dissipation performances of the floating box and Berkeley Wedge breakwaters. The results show that the power generation efficiency of the Berkeley Wedge breakwater is always much higher than that of the floating box breakwater. Besides, the wave dissipation performance of the Berkeley Wedge breakwater is much better than that of the floating box breakwater at lower frequency.     

广州地铁3号线列车空气弹簧载荷内压偏低问题分析与改进

为解决广州地铁3号线列车空气弹簧载荷内压偏低进而影响列车性能的问题,对其进行了原因分析,通过实验室测试和装车数据测量对比的方法,确定了空气弹簧系统改进的具体方案。改进产品经过型式试验和装车考核验证,证明性能可靠,能有效解决空气弹簧载荷内压偏低问题,消除了安全隐患。