民用飞机液压能源系统元件的安装设计

本文针对民用飞机液压能源系统元件的布置与安装展开了探讨分析,重点介绍了油箱、发动机驱动泵、电动泵、蓄压器、油滤、优先阀和地面维护面板等元件的布置与安装设计方法和原则。为民用飞机液压能源系统的元件的安装设计提供指导。     

“项目教学法”在《液压传动与控制》课程中的探索与应用

从《液压传动与控制》教学改革出发,对项目教学法的理论进行探讨,研究了项目教学法在《液压传动与控制》课程中的应用,详细阐述了《液压传动与控制》中的项目设计特点、实施过程和具体实践,并对教学改革的结果进行了科学分析。     

Treatment and hydraulic performances of the NiiMi process for landscape water

This paper describes the NiiMi process designed to treat landscape water. The main aim of the research was to investigate the feasibility of NiiMi for removing organic and nutriment materials from landscape water. During the batch-scale NiiMi operation, the removal rates of color ranged from 66.7%o-80% , of turbidity from 31.7%-89.3%o, of chemical oxygen demand （COD） from 7%-36.5%, of total phosphor （TP） from 43%-84.2%, of soluble phosphate from 42.9%-100%, of total nitrogen （TN） from 4.2%-46.7%, and of NH4^＋-N from 39.3%-100% at the hydraulic loading of 0.2 m^3/（m^2·d）. Results showed that the removal efficiencies of COD, TP, soluble phosphate and TN decreased with the decline in the temperature. The NiiMi process had a strong shock loading ability for the removal of the organics, turbidity, TP, soluble phosphate, TN and NH4^＋-N. Three sodium chloride tracer studies were conducted, labeled as TS 1, TS2, and TS3, respectively. The mean hydraulic retention times （mean HRTs） were 31 h and 28 h for TSI and TS2, respectively, indicating the occurrence of a dead zone volume of 12% and 20% for TS 1 and TS2, respectively. TS 1 and TS2 displayed the occurrence of short-circuiting in the NiiMi system. The comparison results between TS1 and TS2 were further confirmed in the values obtained for some indicators, such as volumetric efficiency （e）, short-circuiting （S）, hydraulic efficiency （2） and number of continuously stirred tank reactors （N）.     

VB和MATLAB在液压比例位置控制回路中的应用

本文在分析了MATLAB和VB开发语言各自优缺点的基础上,通过阐述和使用ActiveXautomation技术,实现了MATLAB和VB的数据交换与集成开发。二者的优点使比例位置控制回路软件开发变得更加简洁、高效。     

液压剪切机的改进研究

针对唐山钢铁（集团）公司自行研制的600吨液压剪切机存在的某些性能缺陷进行了研究,提出了4条改进措施．     

液压随动系统在工程机械操纵系统中的应用

液压随动系统是一种放大机构,也是一种自动调节系统.它在工程机械中应用广泛.本文在介绍液压随动系统工作原理的基础上、着重说明它在工程机械操纵系统中的应用.     

火电厂补给水系统水锤模拟计算研究

简要介绍了水锤计算的理论依据,采用计算机软件模拟火力发电厂补给水系统停泵水锤瞬态过程,重点对采用液控碟阀和空气阀作为事故停泵水利过渡过程防护的可能性进行了分析与论证．研究结果表明,合理设置液控碟阀关闭规律,结合系统合理设置空气阀的措施,能很好地避免水柱分离的发生．     

粘土心墙土石坝发生水力劈裂的临界关系在实际工程中的应用

研究表明心墙土石坝水力劈裂发生时,坝壳与心墙的弹模比和心墙的泊松比存在着临界关系.而该关系式为理论计算,缺少实际工程的论证.文章对踏卡河某水电站的心墙上游面的水压力和总应力进行三维有限元分析,得出该水电站水压力小于总应力,不会发生水力劈裂,与利用临界关系式计算结果一致,从而论证临界关系式的正确性.由于该临界条件较三维有限元计算简单方便,可以为心墙土石坝水利劈裂初步设计提供参考.     

我国奥运女子新兴田赛项目的忧虑与思考

运用文献资料和调查访问等方法，对我国女子三级跳远、撑杆跳高和链球三项新兴田赛项目开展的现状进行了较为系统的分析。研究指出，我国女子新兴田赛项目担纲运动员年龄偏大，专业队伍和后备力量的规模过小，以及国内竞赛没有与国际竞赛接轨等，已成为制约我国女子新兴田赛项目发展的主要因素。建立和完善促进我国女子新兴项目发展的训练和竞赛体制，已成为当务之急。     

Investigation of the hydro-mechanical behaviour of fouled ballast

In this study, a fouled ballast taken from the site of Sénissiat, France, was investigated. For the hydraulic behaviour, a large-scale cell was developed allowing drainage and evaporation tests to be carried out with monitoring of both suction and volumetric water content at various positions of the sample. It was observed that the hydraulic conductivity of fouled ballast is decreasing with suction increase, as for common unsaturated soils. The effect of fines content was found to be negligible. For the mechanical behaviour, both monotonic and cyclic triaxial tests were carried out using a large-scale triaxial cell. Various water contents were considered. The results were interpreted in terms of shear strength and permanent axial strain. It appeared that the water content is an important factor to be accounted for since any increase of water content or degree of saturation significantly decreases the shear strength and increases the permanent strain. Constitutive modelling has been attempted based on the experimental results. The model in its current state is capable of describing the effects of stress level, cycle number and water content.