基于K最近邻决策的支持向量机分类算法及仿真

将基于支持向量机(SVM)的分类方法和最近邻法(NN)相结合,提出了一种SVM-KNN的分类方法。通过SVM算法对训练样本进行训练并找出支持向量,在进行待识别样本判断时,当其与最优分类面距离大于某一给定阈值时采用SVM决策模型,否则运用K最近邻法决策其类别,从而减少SVM算法的误判概率。仿真实验结果显示,运用该算法无论对于合成数据还是真实数据,在分类精度上比单独的SVM都有较明显的提高。     

基于嵌入式系统的装备远程故障诊断设计

针对某型通信装备仅提供专用电传接口输出系统信息,无法为用户提供远程维护接口,系统故障及诊断信息无法通过网络传输的缺点,利用嵌入式技术和网络技术,选用基于ARM7TDMI内核的S3C44BOX嵌入式处理器和~Clinux操作系统,设计实现了该装备诊断信息网络化传输的改进方案,为实现装备远程故障诊断提供了保障。     

The development of studying flexible pipe bend reinforced by Kevlar fibers

The flexible pipe bend can not only reduce the structural vibration and fluid noise in pipeline, but also realize the flexible connection of a horizontal line and a vertical line and compensate the displacement of three dimensions produced by the shock or vibration of pipeline in the special situations. Up to now, little attention has been paid to study the flexible pipe bend applied in the pipeline of medium or high pressure, because no appropriate framework materials can be used to reinforce it which must endure the burst pressure higher than 10 MPa. The investigation shows that it is possible to produce the flexible pipe bend of medium or high pressure if such fibers with high performance as Kevlar fibers are used to be its reinforced materials. However, its structural designing theory, manufacturing technology and measuring techniques aren‘t yet perfect and systematic, which leads to the instability of the performance of products. Furthermore, few references about its research can be seen. Therefore, it is necessary to systematically and thoroughly develop the structural designing theory, manufacture technology and measuring techniques of flexible pipe bend.     

Ship hull plate processing surface fairing with constraints based on B-spline

The problem of ship hull plate processing surface fairing with constraints based on B-spline is solved in this paper. The algorithm for B-spline curve fairing with constraints is one of the most common methods in plane curve fairing. The algorithm can be applied to global and local curve fairing. It can constrain the perturbation range of the control points and the shape variation of the curve, and get a better fairing result in plane curves. In this paper, a new fairing algorithm with constraints for curves and surfaces in space is presented. Then this method is applied to the experiments of ship hull plate processing surface. Finally numerical results are obtained to show the efficiency of this method.     

西江桂平二线船闸水力特性原型观测与实船试验

由于船闸存在原模缩尺效应,且桂平二线船闸规模巨大并采用了新型消能措施,为了解其输水特性,保障船闸高效安全运行,通过现场观测与实船试验等手段,对桂平二线船闸输水水力特性、船舶停泊条件及桂平双线船闸间相互影响等进行了详细的观测与分析。结果表明:现有运行方式和推荐运行方式下,二线船闸各项水力指标均能基本满足规范和设计要求,但二线船闸泄水对一线船闸闸门有一定影响,并须重视超灌泄对闸室船舶停泊安全的影响。     

高水头船闸平底廊道反弧形阀门净动水启门力非恒定流试验

通过非恒定流试验对平底廊道反弧形阀门净动水启门力进行研究,研究表明:1)阀门净动水启门力可以分解为两个部分,一部分由廊道水流作用产生,另一部分由门井水流作用产生;2)各开度下由廊道水流运动引起的阀门净动水启门力与孔口水流弗劳德数的平方成线性变化关系;3)各开度下由门井水流运动引起的阀门净动水启门力与门井水流弗劳德数成线性变化关系;4)首次提出了高水头船闸平底廊道反弧形阀门净动水启门力计算公式,公式计算结果与原型观测结果吻合好,计算精度高。     

Subsidence Velocity Estimation Using PS-Based Time Series DInSAR

Introduction As a new space-geodetic technology, satellitedifferential synthetic aperture radar interferometry(DInSAR) has proven highly powerful for regionaldeformation mapping with some prominent advantageslike high sensitivity to displacement, high spa…     

添加稀土元素对硬质合金物理机械性能和切削性能的影响

本文研究了稀土元素的添加种类和添加量对ＹＴ１５硬质合金物理机械性能和切削性能的影响。研究结果表明，添加稀土元素后硬质合金刀片的抗弯强度以及刀具耐用度等显著提高；添加Ｓｍ，Ｙ，ＳｍＰｒ效果较好，并且添加量存在一量佳范围，本文还对添加稀土元素后硬质合金的改机理作了探讨。     

A new model for soil consolidation based on microstructure

This paper introduces a new means to predict consolidation deformation of soil from its microstructure. Based on a kind of pore-size distribution density function, a fractal model for soil consolidation is established. Through this model, the relation between macroscopic deformation and microcosmic pore property of soil is founded. In order to justify this proposed model for soil consolidation, consolidation experiments of soft clay are performed. Afterward, the microstructure of soft clay unconsolidated and consolidated under every pressure is studied by a scanning electron microscope (SEM). The results show that the proposed model for soil consolidation is valid in predicting consolidation deformation.     

Numerical simulation of non-destructive testing of stainless steel composites plate by infrared thermography

The non-destructive testing (NDT) of debonding in stainless steel composites plate (SSCP) is performed by infrared thermography, finite element analysis (FEA) software ANSYS is taken as the simulative tool, and 2D simulative model has been set up to investigate effect of the thickness of coating and/or substrate on the detectibility of debonging in SSCPs. Two parameters, namely the maximum defect temperature difference and defect appearing index, are defined to evaluate the detectivity of defects, and their computational methods and formulas are given respectively. The preliminary changing tendency of the maximum defect temperature difference and defect appearing index with the thickness of coating and/or substrate is found by numerical simulation.