隧道监控量测技术应用实例

以某高速公路隧道施工监控为例,详细介绍了隧道监控量测必测项目,如周边位移及拱顶下沉量测数据处理方法及在工程施工中的实际应用,并提出了相关处置意见,及处置后的效果,以供参考。     

空调客车动力性燃油经济性计算与参数的灵敏度分析

建立了燃气客车动力性、燃油经济性计算的数学模型,对于某款空调客车,用Matlab软件编制了汽车动力性与燃油经济性各评价指标的计算程序,获得了燃气客车的动力性和燃油经济性结果,同时与实际所测数据进行了比较。通过灵敏度计算分析了各参数对相应性能的影响程度,对于新车设计具有重要意义。     

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论坛以“轨道交通技术政策”为主题,针对城市轨道交通、城际轨道交通和高速铁路,结合国家与区域社会经济发展的需求,提出了不同类型轨道交通的功能定位. 研究了不同类型轨道交通系统单位周转量能耗的统计指标,以及计算模型和方法. 结合实际统计数据与列车运行的仿真计算,定量测算了不同技术参数和运输组织方案下轨道交通能耗的变化趋势,从节能角度对我国轨道交通发展的技术政策提出了建议.     

Operation and Organization Management of High-speed Railway in Japan

Under the background of the rapid development of high-speed railway in China, the paper analyzes the world's first operational high-speed railway—Japan Shinkansen to get a clear solution to the problems of the organization and management operations of high-speed railway. On the basis of actual operating data, the means and measures in organization and operational management of Japan Shinkansen are evaluated by horizontal and vertical comparison. And then, the paper makes the judgment to the related issues of the development of China's high-speed railway. Some conclusions are made, such as the development speed should not be too fast. The high-speed railway should be operated at the same railway station with the traditional railway with multi-parking program train. The competitive advantage within 600 km should be extensively explored. And it is essential to conduct scientific fare adjustment mechanism and put the energy consumption and emissions in the first place. The research provides reference for high-speed railway sustained and healthy development in China.     

CORS系统在航道工程测量中的应用

CORS系统在航道工程测量方面的应用前景十分广阔,该文介绍了CORS系统技术的基本原理,在航道工程测量中的应用以及与常规RTK相比所具有的特点。通过工程实例,展示CORS系统在超长作业区域中体现出的优越性能,阐述了CORS系统发展趋势。     

石林隧道施工用电方案设计

通过石林隧道施工现场勘察、用电设备总容量计算,经比选,确定了施工用电方案。就安全用电技术措施、组织措施作了简要介绍。     

Controlled installation of spudcan foundations on loose sand overlying weak clay

Offshore jack-up rigs are often used for site exploration and oil well drilling. The footings of jack-up rigs are known as spudcan foundations. The risk of rapid uncontrolled penetration of spudcan in seabed (“punch-through”) exposes jack-ups to significant risk during installation in strong over weak layered seabeds. An example for this is a thin loose sand layer overlying a weaker stratum of clay. To prevent spudcans from “punch-through”, an in-situ measurement concept is suggested in this paper to control the installation process of spudcan foundations. First, three-dimensional finite element studies using a Coupled Eulerian–Lagrangian method are carried out to simulate the penetration process. The numerical results have been validated with existing analytical solutions and centrifuge model test data. Furthermore, parametric studies are carried out to quantify the influences of the sand thickness and shear strength of the clay on the bearing capacity of spudcans. Based on the numerical studies an idea for the development of an in-situ measurement concept is suggested to control the spudcan penetration process in-situ.     

船舶轴系子系统力传递特性研究

建立了用于分析螺旋桨非定常力到船体传递特性的轴系子系统模型,并分析了轴系子系统的固有频率振动特性和力传递特性。同时,在实船上探索性地开展了轴系脉动力测试和主推力轴承系统纵向动刚度测试,并应用轴系子系统计算结果分析了实船测试数据,互相验证了轴系子系统力学模型、计算方法和实船测试结果的正确性。     

回油阀调节式高压油泵本体裂穿故障分析

针对少见的回油阀调节式高压油泵本体裂穿故障,文章通过实例具体分析说明了高压油泵本体裂纹形成的可能原因,并对设备维护和日常运行管理提出了相应的预防建议。     

某型舰辅汽轮机转子汽封轴颈磨损改性修复及其摩擦磨损性能研究

采用超音速火焰喷涂技术和电镀技术分别在45#钢试件表面制备了WC-12Co涂层和硬铬镀层。利用环块磨损试验机测试WC-12Co涂层和硬铬镀层与炭精试块对磨时的室温摩擦磨损性能。并通过显微硬度计和金相显微镜观察分析磨损表面形貌。结果表明：WC-12Co涂层的综合性能指标明显高于硬铬镀层。将该技术用于修复汽轮机转子汽封轴颈表面,可极大提高汽轮机转子的技战术性能,降低维修频率,延长使用寿命。