DJJ1型高速交流传动电动车组的外形设计与试验

主要介绍了DJJ1型高速交流传动电动车组流线型外形的设计、具体结构、空气动力学仿真计算结果及试验结果,表明其外形的先进性及适用于更高速度运行的良好的空气动力学性能。     

Phase change analysis of an underwater glider propelled by the ocean's thermal energy

The phase change characteristic of the power source of an underwater glider propelled by the ocean's thermal energy is the key factor in glider attitude control. A numerical model has been established based on the enthalpy method to analyze the phase change heat transfer process under convective boundary conditions. Phase change is not an isothermal process,but one that occurs at a range of temperature. The total melting time of the material is very sensitive to the surrounding temperature. When the temperature of the surroundings decreases 8 degrees,the total melting time increases 1.8 times. But variations in surrounding temperature have little effect on the initial temperature of phase change,and the slope of the temperature time history curve remains the same. However,the temperature at which phase change is completed decreases significantly. Our research shows that the phase change process is also affected by container size,boundary conditions,and the power source's cross sectional area. Materials stored in 3 cylindrical containers with a diameter of 38mm needed the shortest phase change time. Our conclusions should be helpful in effective design of underwater glider power systems.     

一种交通量检测设备布设方法的研究

针对目前交通流检测设备布设中出现的一些问题，借助均匀设计方法，结合神经网络处理观测交通流数据，在设置数量有限制条件下，开展布设方案优化设计研究。方案设计力图在人力、物力投入最小的前提下，通过典型路段、交叉口等交通基础设施的组合，可以更多的获取交通流参数信息，全面、准确的反映城市交通流分布情况。选用了67的均匀设计表作为方案设计基础表，经过拟水平处理后设计优化方案，运用BP神经网络构建交通量推断模型，判定设计方案的优劣，进行了实地交通流检测设备优化布设研究。通过研究可知，采取优选布设方案采集的交通量对检测路段交通量进行预测，相对偏差可以达到0．006。     

海工耐久混凝土配合比设计研究

以杭州湾跨海大桥为背景,着重对海工耐久混凝土配合比进行了研究。在确定海工耐久性混凝土配合比之前,进行了掺减水剂混凝土拌和物性能对比试验、不同矿粉掺量混凝土氯离子渗透性能的对比试验、不同水泥用量混凝土抗压强度的对比试验、承台墩身配合比试验。根据上述试验结果,确定的配合比使海中混凝土既能满足耐久性要求,又能满足低成本的要求。     

桥梁施工大型临时结构设备标准化设计研究

桥梁结构的种类和形式多样，所在的地理位置和自然条件差别较大。桥梁施工中需投入大量的大临结构和施工设备。桥梁施工企业研究大临结构和设备的标准化、定型化设计，是企业对设备资源配置的再优化，是提高企业资源的利用率、低施工成本的需要。介绍几种大临结构定型化设计与应用情况，分析、研究企业大临结构和设备的标准化设计的一些思路和意见。     

系杆葵拱桥设计研究

系杆葵拱桥是一种新颖的桥式结构,采用体外束系杆平衡主拱推力,从而解决了软弱地基修建上承式拱桥的难题。本文结合江山市迎宾大桥的设计,介绍了该桥型的结构体系构思、基本受力性能和造型特点。     

软土地基地段动态设计的理念和方法

简要介绍了秦沈客运专线软土和松软地基处理方案和路基工后沉降量控制标准，通过秦沈客运专线动态设计实践，强调在高速铁路建设过程中开展动态设计的意义，并从沉降断面布置、设备选择、观测频度、数据处理方法、数据分析的基本原理和应用等方面，系统介绍动态设计的方法和步骤。     

Phase change analysis of an underwater glider propelled by the ocean＇s thermal energy

The phase change characteristic of the power source of an underwater glider propelled by the ocean＇s thermal energy is the key factor in glider attitude control. A numerical model has been established based on the enthalpy method to analyze the phase change heat transfer process under convective boundary conditions. Phase change is not an isothermal process, but one that occurs at a range of temperature. The total melting time of the material is very sensitive to the surrounding temperature. When the temperature of the surroundings decreases 8 degrees, the total melting time increases 1.8 times. But variations in surrounding temperature have little effect on the initial temperature of phase change, and the slope of the temperature time history curve remains the same. However, the temperature at which phase change is completed decreases significantly. Our research shows that the phase change process is also affected by container size, boundary conditions, and the power source＇s cross sectional area. Materials stored in 3 cylindrical containers with a diameter of 38ram needed the shortest phase change time. Our conclusions should be helpful in effective design of underwater glider power systems.     

最优设计及分配理论在舰船维修中的应用研究

通过基于多服务台有限源排队系统的理论,分析舰船维修工作中在满足一定的可靠性要求下的最优设计与最优分配问题,同时结合计算机技术,提出了求解的方法,最终通过举例确定其最优设计理论的准确性。     

强夯挤淤在抛石引堤工程中的应用

本文结合南海石化项目引堤采用强夯挤淤代替挖泥的实践,重点介绍强夯参数的确定,施工方法及强夯效果。