Design of Continuous and Discrete LQI Control Systems with Stable Inner Loops

Design approaches were proposed for both continuous and discrete LQI (linear quadratic with integral) controllers, if exist, to stabilize the inner loops in addition to stabilizing the closed loops and minimizing the quadratic cost functionals. Derived from the algebraic Riccati equations involved in continuous and discrete LQI control, the design approaches were straightforward obtained by setting the quadratic cost functionals to decoupled forms with positive definite weighting matrices. Examples were provided to verify the effectiveness of the approaches.     

Geometric modelling of bulbous bows with the use of non-uniform rational B-spline surfaces

Nowadays, bulbous bow forms have become a common design feature in most conventional ship designs. The design of a bulbous bow is usually attempted with the use of certain form parameters that are imposed using the designer's experience or regression values that provide the optimum parameters based on experimental tests or computational fluid dynamics (CFD) calculations. In this article, the geometric modelling of a bulbous bow form that complies with a series of parameters is presented. First, a wire model was constructed with cubic B-spline curves that hold certain form parameters that the designer wants to impose. Second, a B-spline surface that fits these splines was mathematically constructed. A review of the influence of the design parameters used on the bulbous bow properties was made. This method could be used prior to numerical optimization of a bulbous bow because different variations of the design can be easily generated. These variations can be tested numerically using CFD software. A practical application example of the method is shown.     

赤水河机动驳新船型快速性能试验研究

根据“赤水河航运新船型研究”科研项目的要求，研究并设计出赤水河航运的新船型。对设计的新船型进行了快速性能试验，同时选定了赤水河现有的1艘优秀机动驳作为对比船进行快速性能试验。两船试验结果对比表明新船型的阻力性能、推进性能优于对比船。在相同主机功率条件下，设计船的预报航速高于对比船。     

一种实用的水线面变换方法

通过设计线面变换变换与横剖面面积曲线变换，保持横剖面面积线不变，获得满足设计水线面积系数变化要求的新船型，而不必精心寻找横剖面线变换的函数形式，本方法不仅适用于前体，也适用于后体，是对传统母型船变换方法的一个扩充。     

数据包络分析模型与方法在船型方案排序择优中的应用

阐述了使用具有铭结构的DEA模型──C~2WH对有限方案多准则船型方案作有效性评判择优的原理和方法。针对船型论证，对C~2WH模型作了变换处理，使模型和方法更加筒明，且便于应用。算例表明，本文方法用于船型方案排序择优，不仅能继承以往DEA模型C~2R、C~2GS~2等体现出的使船型技术经济综合评判定量化的优点，还能较好地体现船舶设计者基于经验的偏好。     

列车编组方式对运行空气阻力的影响

根据风洞试验结果，分析列车不同混编状况，不同头、尾部形状组合及列车编组长度等对运行空气阻力的影响，为合理确定列车编组方式提供了依据。     

全面推进船型标准化 提高京杭运河竞争力

发展内河航运涉及船舶、航道、港口及信息技术等诸多要素。在京杭运河实施船型标准化示范工程,目的就是保护运河水环境,改善广大船民的生产和生活条件,提高船舶营运效率,降低运输成本,提升内河航运的竞争力。     

船型生成

介绍了中国船舶科学研究中心开发的一个船型生成模块及其特点和应用情况。该模块是针对大型集装箱和大方形系数低速船而建立的，但对一般的船型也适用。它利用强大的数据库，不但能生成性能良好的光顺线型，并能对该船型的快速性能作了评估。     

船体B样条曲面的数学描述及计算机方法

叙述了三次Ｂ样条曲面的特点、数学描述、船体曲面片的拼接和曲面边界的处理，最后给出船体曲面设计产例，证明所述方法的正确法。     

GRC永久模板在桥梁悬臂现浇梁上的无支架施工

通过对桥梁悬臂现浇梁的永久模板的施工研究,以及拱桥无支架施工技术的论述,提出了桥梁悬臂现浇梁的GRC永久模板的施工采用无支架施工的设想。通过对模板安装和无支架施工的改进,达到了预想的效果,从而为新材料模板工程的施工指明了方向。