直接计算法在舰船结构设计实践中的应用

阐述了在舰船结构设计实践中，如何运用直接计算法解决按照规范设计引起的某些问题。以单跨梁、板架、立体舱段局部强度计算的三个实例，介绍了用ANSYS命令流（APDL）编制源程序进行直接计算设计的技巧和体会。     

铁路行包物流基地及配送点选址规划研究

借鉴国内外选址问题的模型和方法,结合铁路行包物流配送流程及特点,建立铁路行包物流基地及配送点选址规划问题的混合整数规划模型。通过改进的扫描法,根据业务量及现有车辆载重对城市内邮政点进行分组。用迭代法计算得到每个分组中的配送点。比较各分组方案,选择最好的一个方案作为初始解。采用启发式算法对该初始解优化,得到满意解,确定配送点及行包物流基地的位置。以有2个行包物流基地待选地点、3个大宗行包点、30个一般邮政点的实例进行仿真计算。计算结果验证了模型及算法的正确性及可行性。     

高速电气化铁路的接触网电分相型式探讨

根据目前关节式电分相存在问题，提出一种新型的3个绝缘锚段关节双中性段关节式电分相型式，有效地克服了目前双锚段关节单中性段关节式电分相存在的问题，可较好解决关节式电分相对电力机车受电弓多弓运行条件的限制。     

Fundamental formulation for frictional contact with graded materials

In the paper, we develop the fundamental solutions for a graded half-plane subjected to concentrated forces acting perpendicularly and parallel to the surface. In the solutions, Young's modulus is assumed to vary in the form of E(y) = E0e(ay) and Poisson's ratio is assumed to be constant. On the basis of the fundamental solutions, the singular integral equations are formulated for the unknown traction distributions with Green's function method. From the fundamental integral equations, a series of integral equations for special cases may be deduced corresponding to practical contact situations. The validity of the fundamental solutions and the integral equations is demonstrated with the degenerate solutions and two typical numerical examples.     

制动电阻器多学科设计优化

为了确保机车、动车制动电阻器整体性能提高,以某型号特种内燃动车制动电阻器传热性能、经济性能、质量以及抗热冲击性能为目标函数建立多学科设计优化模型,并充分考虑各学科之间的耦合效应,采用自适应混沌优化算法对多学科设计优化模型进行求解。多学科设计优化结果表明,该制动电阻器传热性能增加11.51%,设计成本下降7.05%,质量减少7.21%,抗热冲击性能增加15.50%,整体性能提高9.97%。优化前后特种内燃动车制动电阻器的安全温度对比实验表明,制动电阻片的安全温度由优化前的500℃提高到优化后的550℃。     

一种适合于异型螺杆粗加工的方法

根据异型螺杆的加工原理，本文提出了一种适合于螺杆粗加工的插补算法。并以此算法为基础，提出了复合控制的策略，采用这种控制方法，可有效地提高螺杆粗加工的加工精度和生产效率。     

Ship appearance optimal design on RCS reduction using response surface method and genetic algorithms

Radar cross section (RCS) reduction technologies are very important in survivability of the militarynaval vessels. Ship appearance shaping as an effective countermeasure of RCS reduction redirects the scatteredenergy from one angular region of interest in space to another region of little interest. To decrease the scatteringelectromagnetic signals from ship scientifically, optimization methods should be introduced in shaping design.Based on the assumption of the characteristic section design method, mathematical formulations for optimalshaping design were established. Because of the computation-intensive analysis and singularity in shapingoptimization, the response surface method (RSM) combined genetic algorithm (GA) was proposed. The poly-nomial response surface method was adopted in model approximation. Then genetic algorithms were employedto solve the surrogate optimization problem. By comparison RCS of the conventional and the optimal design,the superiority and effectiveness of proposed design methodology were verified.Ky words: radar cross section (RCS); characteristic section design method; response surface method; genetic algorithm (GA) was proposed. The polynomial response surface method was adopted in model approximation. Then genetic algorithms were employed to solve the surrogate optimization problem. By comparison RCS of the conventional and the optimal design, the superiority and effectiveness of proposed design methodology were verified.     

Experimental and numerical investigation on the derailment of a railway wheelset with solid axle

This paper presents the results of an experimental and numerical investigation on the derailment of a railway wheelset with solid axle. Tests were carried out under quasi-steady-state conditions, on a full-scale roller rig, and allowed to point out the effect of different parameters like the wheelset's angle of attack and the ratio between the vertical loads acting on the flanging and non-flanging wheels. On the basis of the test results, some existing derailment criteria are analysed in this paper and two new criteria are proposed. A model of wheel-rail contact is proposed for the mathematical modelling of the flange climb process, and numerical vs. experimental comparisons are used to obtain model validation.     

基于X-LMS自适应逆控制理论的船舶自动舵研究

本文分析了自适应逆控制理论和X—滤波LMS自适应逆控制算法，并针对船舶自动舵特点，用修正传递函数的方式来稳定船舶操纵模型，使用LMS算法对船舶进行模型参数辩识和控制器的设计。仿真结果表明，与PID控制相比，X—滤波LMS自适应逆控制算法具有动态响应快，抗扰动性好等特点。     

密接式车钩试验装置

介绍了密接式车钩试验装置的组成和试验内容,对试验中遇到的问题提出了解决办法。