连云港港货物吞吐量预测研究

分别采用线性回归法和支持向量机法对连云港港货物吞吐量进行预测研究,在此基础上,提出基于前两种方法的最优线性组合预测模型。通过对3种预测方法的预测结果对比,指出组合预测法具有性能稳定且精度较高的特点。最后根据组合预测模型结果,给出连云港港2010—2015年货物吞吐量的预测数据。     

基于ADSP2106X的制导雷达信号处理方法

通过对ADSP2106X性能特点的分析,结合新体制制导雷达对信号处理的要求,提出了一种制导雷达多信号处理系统设计方案。该系统具有信号实时处理能力,能同时采集、处理、显示多路信号,处理能力强,设计简捷,使用灵活、方便。     

基于CCD的增压锅炉火焰温度及辐射率检测

为实现对炉内火焰温度分布进行实时监测和有效控制以提高锅炉运行的可靠性和经济性,通过接口与密封装置,将3支彩色火焰图像探测器分别布置在增压锅炉前后墙的观火孔内,通过专业采集软件采集炉内火焰图像并保存至计算机中,运用图像处理技术以及基于双色法的火焰温度检测方法得到火焰的辐射温度和辐射率分布图像,实测结果与数值模拟结果吻合较好。不同负荷下试验表明:辐射温度与过热蒸汽温度、烟气压差和燃油压力的变化趋势表现很好的一致性,辐射率的变化趋势则与之相反。     

基于CUDA的雷达线性调频信号脉冲压缩实现

利用图形处理器（GPU）作为雷达仿真平台,采用统一计算设备架构（CUDA）技术,实现雷达线性调频信号脉冲压缩算法,并与CPU算法进行比较。实验结果表明利用CUDA技术实现的脉冲压缩算法取得了比CPU算法明显较高的运算效率。     

基于SVM的隧道衬砌空洞填充物雷达图像识别研究北大核心CSCD

衬砌背后空洞及其填充物对隧道结构安全具有重要影响,开展空洞探测识别对于结构安全评估和病害处置具有重要意义。首先采用室内试验和FDTD正演模拟相结合的方法,获得了空洞内填充空气、水、干砂、湿砂条件下的雷达图谱数据,并对不同填充物波形规律进行对比分析;然后,基于支持向量机算法对波形特征进行提取和分类识别,建立了一种空洞填充物的人工智能辨识方法。研究结果表明,采用傅里叶变换前的平均值、方差、平均绝对离差和傅里叶变换后的最大幅度值max(fft(X))四个统计量作为支持向量机的识别特征,可以有效区分出衬砌背后填充物的六种类型;当采取单一倾向数据时,识别准确率较好,六种物质二分类问题准确率均可以达到90%以上。     

矩形凸台零件加工误差分析

本文根据矩形凸台零件在铣削加工过程中出现的形状误差,指出了该零件数控加工程序编写中存在的问题,并用图解方式阐明了其误差产生的主要原因以及保证零件加工精度的编程要点。     

基于聚类的朴素贝叶斯分类无监督学习方法

为实现朴素贝叶斯分类模型的无监督学习,提出一种基于数据挖掘理论中聚类算法思想的学习方法。该方法首先定义不同类型单维状态分量的差异度量方法和混合型多维向量的联合差异度量方法,通过分析样本数据中向量之间的差异性进行聚类统计,得到研究对象的分类类别,然后对各单维状态分量分别聚类得到特征核值,进而确定不同类别各分量对应单维特征核值空间的概率隶属度。仿真实验结果表明,该方法能有效进行朴素贝叶斯分类学习。     

Investigation of the condition and the behavior of a modular floating structure by harnessing monitoring data

In this paper, the condition and the behavior of an installed and operating Modular Floating Structure (MFS) is investigated and assessed by harnessing field monitoring data and using collectively multiple Correlation Coefficients (CCs) between measured quantities. The examined MFS consists of five pairs of interconnected floating concrete modules and it functions as a floating breakwater. The field monitoring data are acquired through a sensor network deployed on one pair of modules (connected through two groups of connectors) of the MFS. A methodological data processing framework for data organization, manipulation and post-processing is developed and presented. This framework enables the quantification of the structure's condition at different time periods through the calculation of CCs: (a) between the incident wave height and the tensions of the mooring lines and (b) between the tensions of the mooring lines, considering various wave directions. Recorded data at three characteristic time periods during the structure's lifetime are used, namely: (i) before any failure (structure's initial condition), (ii) after the failure of the first connectors' group and (iii) after the failure of the second connectors' group. The data processing framework developed in the present paper is applied to the above recorded data in order to calculate CCs and, therefore, quantify the structure's condition, at the three aforementioned time periods. The quantification of the structure's initial condition resulted to conclusions that were consistent from a physical point of view with the most recently documented, available in-situ mapping of the mooring lines' configuration in the horizontal plane. By considering the structure's initial condition as a reference base for comparison, the effect of the connectors' failure on the CCs, used to quantify this condition, was also investigated and efficiently assessed. Specifically, the significant changes observed in the variation patterns of all examined CCs, when compared with their respective patterns corresponding to the structure's initial condition, demonstrated and confirmed the existence of significant reformation of the examined structural system resulting from the connectors' failure. In this way, the effectiveness of the joint utilization of CCs to assess the structure's condition was proved.     

基于VDR回放数据的船舶碰撞过程仿真系统的设计

应用开发船用航行数据记录仪(VDR)，在将其作为新数据源的基础上，提出了一种基于VDR回放数据的船舶碰撞过程仿真系统的设计方案，并对系统的结构和所采用的主要技术进行了详细的介绍。     

电压型PWM整流器电流空间矢量控制研究

针对如何提高电压源型三相PWM整流器交流侧电流的控制速度问题,本文提出了控制和调制相结合的两种控制策略,即电流的空间矢量滞环控制策略和优化的电流空间矢量控制策略。本文分别对这两种控制策略进行了仿真,仿真结果验证了两种策略的有效性。