摘要：以某双蜗壳混流泵转轮为例,采用CFX-ANSYS流固耦合分析技术对其设计工况点下,分别在空气和水中进行静力强度和模态分析,计算出其应力、位移分布和振动的固有频率。结果表明,水压力仅改变转轮的位移与应力分布,而对强度和振动频率的影响很小,为转轮的整体强度设计和振动分析提供了简化依据。

摘要：深覆盖层面板堆石坝监测一直是国内外工程界至今尚未解决的难题。结合九甸峡水利枢纽深覆盖层面板堆石坝监测的实施,以及对监测成果的分析,提出合理解决深覆盖层面板堆石坝监测难题的有效方法,可为深覆盖层面板堆石坝监测提供借鉴。

摘要：某桥为主跨260 m三塔双索面预应力混凝土拱塔斜拉桥,采用空间有限元法对5种荷载工况下索塔锚固区节段应力进行分析。结果表明:空心矩形索塔内布置双向井字形预应力筋能够有效抵消斜拉索水平分力产生的拉应力;索力及预应力分别作用下,距离基准节段中心分别为1.2 m和1.5 m范围内,应力呈现渐进衰减趋势;设计计算中可通过控制侧墙与倒角交界处、斜拉索出口处以及锚块与塔壁交界等处混凝土应力,来控制整个索塔锚固区的应力分布。

摘要：基于复合抛物面型集热器(CPC)的光学特性,介绍了一种新型的选择性太阳光隧道,采用光线跟踪法分析并计算其冬夏两种工况下的光学特性。结果表明,选择性太阳光隧道利用冬夏两季太阳高度角的差异可实现不同的吸热效果,为设计改进太阳能集热器提供了理论依据。

摘要：The object of this study is to determine the seismic response of regular high-rise steel buildings with chevron-braced frames. Mechanics models of three buildings of 14, 18 and 20 stories are studied, all of them with similar geometric characteristics in plant and elevation. These models are realized using prescriptions and parameters from venezuelan design codes. The seismic action is carry on through varius synthetic design spectrum compatible accelerograms defined by the seismic codes in this study, with three levels of intensity corresponding to three specific Limit States. Dynamic analysis is used to compute parameters of ductility, over strength and maximum displacements. From these results it can be concluded that chevron-braced frames presented a good overall performance and non V-braced frames show greater damage due to dynamic actions, validating non linear dynamic analysis as a very powerful tool to seismic-resistance design and chevron-braced frames as a very useful choice in improving the response of tall steel structures. since this lateral bracing system is absent from Venezuelan seismic codes.

摘要：This research evaluated the suitability of stone dust in the design and production of High Perfor-mance Concrete (HPC). HPC mix was designed, tested, costed and a comparison of concrete classes used in the market (Class 25, 30 and 35) done using Cost Benefit analysis (CBA). The cost benefit was analyzed using Internal Rate of Return (IRR) and Net Present Value (NPV). Laboratory tests established the properties concrete obtained from the design mix. Compressive strength, slump, and modulus of elasticity were tested and analyzed. Structural analysis using BS 8110 was done for a 10 storey office building to establish the structural member sizes. Members obtained from concrete Classes 25, 30, 35 and the new compressive strengths from HPC (Class 80) were obtained and compared. analysis was done for structural members’ sizes and area freed as a result of de-signing with HPC as well as the steel reinforcement used. To justify the initial cost of HPC if ado- pted, the Cost Benefit analysis (CBA) was used to estimate increased costs versus income resulting from increased let table space created. The minimum class of concrete used in design was limited to Class 25 N/mm2. The research shows that it is possible to manufacture high strength concrete using locally available stone dust. The stone dust sampled from Mlolongo quarries achieved a characteristic strength of 86.7 N/mm2 at a water cement ratio of 0.32. With the results structural analysis of a 10 storey office structures with columns spaced at 8 meters center to center was de-signed using the four classes and results compared. There was a reduction of columns from 1.2 m wide to 0.65 m wide (over 45%) when concrete class changes from Class 25 to Class 80 creating over 3% of the total space area per floor. Cost benefit analysis using Net Present Value (NPV) and Internal Rate of Return (IRR) presented business case for the use of HPC. With Class 80, the IRR was at 3% and NPV being 8% of the total initial investment. The ste

摘要：数据字典DD是数据处理系统结构化分析方法的重要工具之一.在DD中,各数据元素之间应能相互匹配,并应与数据流程图DFD中各元素一一对应.DD与DFD分别以文字和图形的方式描述系统,因此DD更有利于计算机的数据表达.若对DD的内容描述更进一步地细化和扩充,采用人工智能AI的方法来实现人的感知行为活动和推理的智能化数据字典,那么DD即可成为一份通过系统分析和设计而产生的系统的详细说明文档.为此,本文就智能化数据字典的知识库的建立,以及实现其推理机制、知识获取和实用数据处理系统的功能优化等问题进行讨论。

摘要：针对蜗壳结构安全是确保大型水电机组稳定运行的关键,通过简化算法对糯扎渡大型水电站蜗壳结构进行了三维有限元分析。计算结果表明,蜗壳结构各截面最大拉应力值出现于蜗壳顶部混凝土处,钢蜗壳选用充水保压浇筑外围混凝土的埋置方式合理、有效可行,可为蜗壳结构设计与施工提供参考。

摘要：针对宁夏沿山输电线路架空地线多年频繁断股问题,引进了微风振动在线监测系统,对330 kV大铜Ⅰ回线#12塔和220 kV大青丙线#16塔导、地线进行振动监测,并与输电线路振动判定标准进行对比,发现地线中频区段动弯应变值超标,采取计算、模拟试验等方法,设计并实施了两种改进的防振方案,明显降低了地线振动水平,为输电线路微风振动治理及工程应用研究提供了参考依据。

摘要：以机械加工中常用车床CA6140为研究对象,分别采用基于ANSYS的有限元法和实验法对其主轴进行了振动模态与频率响应分析,并对两者的计算结果进行了对比分析,验证了ANSYS数值仿真的准确性。数值仿真和实验结果表明:主轴在一阶频率和五阶频率处容易发生共振,但未达到共振,且低阶频率要比高阶频率对主轴的振动影响大;通过实验得出,主轴在工作状态下的最大振动主要集中在其两端轴承附近区域,因此改进轴承是减小主轴振动、保证主轴加工精度的重要途径,其研究结果可对车床的结构优化设计提供理论指导。