三维水翼升力线理论(英文)

Prandtl’s lifting line theory was generalized to the lifting problem of a three-dimensional hydrofoil in the presence of a free surface. Similar to the classical lifting theory, the singularity distribution method was utilized to solve two-dimensional lifting problems for the hydrofoil beneath the free surface at the air-water interface, and a lifting line theory was developed to correct three-dimensional effects of the hydrofoil with a large aspect ratio. Differing from the classical lifting theory, the main focus was on finding the three-dimensional Green function of the free surface induced by the steady motion of a system of horseshoe vortices under the free surface. Finally, numerical examples were given to show the relationship between the lift coefficient and submergence Froude numbers for 2-D and 3-D hydrofoils. If the submergence Froude number is small free surface effect will be significant registered as the increase of lift coefficient. The validity of these approaches was examined in comparison with the results calculated by other methods.     

浅水短波Degasperis-Procesi方程的环形孤立波解(英文)

An analytic method, i.e. the homotopy analysis method, was applied for constructing the solutions of the short waves model equations associated with the Degasperis-Procesi (DP) shallow water waves equation. The explicit analytic solutions of loop soliton governing the propagation of short waves were obtained. By means of the transformation of independent variables, an analysis one-loop soliton solution expressed by a series of exponential functions was obtained, which agreed well with the exact solution. The results reveal the validity and great potential of the homotopy analysis method in solving complicated solitary water wave problems.     

舰船计划修理信息管理系统的研究与开发

从海军舰船计划修理中各类故障及维修信息纷繁复杂、管理难度大的问题着手,分析了开发舰船计划修理信息管理系统的必要性,深入研究该系统的总体结构和功能框架,并提出利用计算机信息技术实现系统功能的方法.该系统的开发能为舰船计划修理提供高效的工作平台和信息处理平台,实现舰船计划修理工作的信息化.     

水下爆炸空化效应作用下全船响应的并行计算(英文)

As well as shock wave and bubble pulse loading, cavitation also has very significant influences on the dynamic response of surface ships and other near-surface marine structures to underwater explosive loadings. In this paper, the acoustic-structure coupling method embedded in ABAQUS is adopted to do numerical analysis of underwater explosion considering cavitation. Both the shape of bulk cavitation region and local cavitation region are obtained, and they are in good agreement with analytical results. The duration of reloading is several times longer than that of a shock wave. In the end, both the single computation and parallel computation of the cavitation effect on the dynamic responses of a full-scale ship are presented, which proved that reloading caused by cavitation is non-ignorable. All these results are helpful in understanding underwater explosion cavitation effects.     

船舶建造过程中焊接质量数据的追溯

通过关系型数据模型在建立焊接质量管理数据库的基础上，提出了造船过程中焊接质量数据的计算机追溯模型，实现了焊接质量数据从材质、工艺过程以及责任的可追溯性。     

论国有股减持与上市流通

在对国家股和法人股流动方案的设计中，大多数文章只是笼统地提出了一系列的流通渠通，但却较少考虑在这些流通渠道中可能遇到的障碍，也很少谈及这种种流通方式从短期和长期可能对中国的股市产生的影响。本文在考虑公股流通的问题时，将其同上市公司治理结构的改善、对企业高层管理人员和技术创新人员有效的激励和约束有机地结合起来，对以激励高层管理人员和技术创新人员为目的的股票期权方案作了详细的论述。     

筑养路机械液压油污染控制管理

液压油污染是引发筑养机械液压系统故障的主要原因，通过对液压油性能及污染程度的现场分析，给出了防止液压油污染的控制标准和措施。     

草根加筋土的护坡机理及强度准则试验研究

采用室内试验方法研究了草根加筋土护坡加筋原理，试验结果表明其加筋机理可以用准粘聚力原理来解释；通过对准粘聚力的实测结果进行分析研究，提出了加筋粘性土的准粘聚力计算方法；利用莫尔-库仑准则对草根加筋土试验结果的强度包线进行拟合发现效果良好，说明草根加筋土服从莫尔一库仑准则。研究结果对于深入认识植被护坡机理和合理确定草根土的抗剪强度具有指导意义。     

无刷直流电动机的系统仿真

建立了一个块路结合的无刷直流时机系统数学模型,对其稳态动特性进行了仿真,并分析了不同电机参数对电机性能的影响。     

真空辅助压浆技术在哈大客专预制箱梁中的应用

哈大铁路客运专线后张箱梁预制施工中,应用了真空辅助压浆技术。通过对实际施工中采取的质量控制措施的阐述,详细介绍了真空辅助压浆工艺质量控制的经验和措施。应用结果表明,真空辅助压浆施工技术能够有效保证后张箱梁孔道压浆质量。