水工模型试验的流速测量方法与数据处理程序

在水工模型试验中,基础数据的准确度与精确度直接关系到科研成果的质量。流速是模型试验中观测的主要数据之一。模型流速的测量方法有许多种,如示踪物法、光电法、声学多普勒法等。光电法是目前水工模型试验中应用最多的流速测量方法。文章所述的模型测杆流速处理程序实现的功能就是计算流速测杆采集流速的平均值并直观地以流速过程线图显示。通过应用于上海国际航运中心洋山港区整体物理模型试验的实践表明,程序采用微调方法,解决了判断涨落潮时存在的问题,提高了水工模型试验工作的精度和效率,为科学决策提供了依据。     

On the application of hydraulic theory to the deep-water flow through the Irbe Strait

A flow-dependent critical-point method for investigating topographically controlled flow in natural channels is applied to the bottom current through the Irbe Strait connecting the Baltic proper and the Gulf of Riga. This approach is based on the functional formalism due to Gill [Gill, A.E., 1977. The hydraulics of rotating-channel flow. J. Fluid Mech., 80, 641–671.], and here is used for the stratified flow structure observed during the IRBEX-95 field campaign. A critical section of the realizable flow regime was found to be located slightly downstream of the most pronounced horizontal constriction of the channel. The predicted baroclinic volume flux 7200 m³ s⁻¹ overestimates the observed mean bottom-water transport by around 30%, a discrepancy which most likely can be explained by the lack of sea level conditions and friction in the model.     

Integrated coastal water monitoring

Geographical Information Systems (GIS) are important took for environmental monitoring and management. However, their limitations in dealing with complex, dynamic, and mission‐critical situations call for alternative approaches. Integrating GIS with dynamic simulation models offers one such solution. Numerical models that simulate physical, chemical, and biological processes greatly increase our understanding of the environment. Many of these models use refined forecast information to accurately predict processes that help in monitoring and managing the environment. Integrating these models with GIS offers new functionalities. The present research couples the MIKE21 comprehensive modeling system for two‐dimensional free surface flows with the spatial analysis strengths of the ArcView GIS. The southern coastal water system of Singapore serves as the study area. The aim is to develop a comprehensive software system that provides support for both environmental managers and land‐use planners in making their decisions.     

洗扫车清扫液压系统热平衡研究

针对洗扫车作业过程中液压油温过高造成的液压系统运转不正常的问题,在理论分析的基础上运用AMESim软件建立液压系统的热力学模型,对其热平衡特性进行仿真分析,并依据仿真结果为清扫液压系统匹配合适的散热器。在建立模型的基础上,针对产热和散热部件进行优化分析,为液压部件选型提供参考。仿真结果表明,优化方案合理。     

液压油过滤技术在工程机械中的应用

针对工程机械液压油污染等级问题,探讨了液压油过滤技术根据液压油过滤工艺设计了一种具有三级滤芯的过滤机和管路组成的过滤系统,使用快换接头将过滤系统与工程机械液压油箱连接,能满足大批量工程机械液压油过滤作业的需要。用检测仪检测证明:该过滤系统过滤后的液压油污染等级优于行业要求标准     

高真空击密法在京唐港3 000万t煤炭泊位工程吹填土软基处理中的应用

详细介绍了高真空击密法的原理及施工控制要点。通过工程实例,以浅层平板载荷及重型动力触探检测结果和沉降观测数据为依据,证明高真空击密处理软土地基有工期短、效果好等优点,在一定意义上将强夯法推广应用到了饱和软粘土。     

非爆破方法在新紫阳隧道施工中的应用

结合非爆破方法在新紫阳隧道的应用实例,详细介绍了液压锤、达尔达和静态破碎剂三种非爆破方法技术参数的选取,以及隧道施工过程中具体的开挖方案。     

MMB1320B型外圆磨床液压系统的PLC控制

MMB1320B型外圆磨床采用液压驱动和电气控制的方式实现工作台和砂轮架的动作,文中对其电气控制方式加以改造,用PLC软件取代继电器控制系统中大量的中间继电器和时间继电器等以实现液压系统的PLC控制,从而达到节能增效的目的.     

铝电源线在轻型商用车上的应用研究

本文从铝电源线的制造工艺、基本参数、外防护、理论计算和台架测试等方面进行分析,论证其在轻型商用车上代替铜电源线的可行性。     

液压铰链的修理工艺及应用

文章介绍了液压铰链的基本结构和工作原理，分析了不动作的原因，提出了液压铰链修理的具体操作方法，可供同行借鉴。