从潜艇潜望镜到潜艇成像系统的新概念

提出了潜艇成像的全新概念。现代潜艇的获取外部图像信息的方式不再局限于潜艇潜望镜和光电桅杆，而是通过空中、水上和水下三维方式的多种成像传感器实时地向潜艇指挥员提供艇外图像信息。通过这种潜艇成像系统提供的全方位信息，这就大大提高了潜艇的作战能力同时也增强了潜艇的隐蔽性。潜艇成像系统是由8种成像子系统组成的。分别对8种成像子系统的技术现状做了简要的分析。     

某自锚式悬索桥吊杆施工关键技术

自锚式悬索桥是一种结构体系封闭的超静定结构,控制吊杆张拉力是实现合理成桥状态的一项重要措施.文章结合一座自锚式悬索桥吊杆张拉施工,分析了合理成桥状态下的吊杆内力,模拟并确定了吊杆的分次张拉施工过程,在索夹预偏计算中考虑了主缆的几何非线性影响,提出用油顶逐一试张拉的方式检测各吊杆内力.实践表明,文章所提出的吊杆施工技术可保证主梁和主塔受力合理.     

Measuring the safety impact of road infrastructure systems on driver behavior: Vehicle instrumentation and real world driving experiment

Featured in this pilot experimental study is the construction and design of an instrumented vehicle that is able to capture vehicle trajectory data with an extremely high level of accuracy and time resolution. Once constructed and properly instrumented, the various data collection systems were integrated with one another and a driving experiment was conducted on northern Virginia roadways with 18 participants taking part in the study. Trajectory data were collected for each of the drivers as they traversed a predefined loop of four roadway segments with varying numbers of lanes and varying shoulder widths. Data collected from the experiment were then used to calibrate the parameters of the prospect theory car-following model through a genetic algorithm calibration procedure. Once all model parameters were successfully calibrated, significance testing was carried out to determine the impacts that the varying roadway infrastructure had on driving behavior. Results indicated that there were significant changes in behavior when comparing one lane roadways to their two lane counterparts—specifically in cases where the roadway featured a wide shoulder. Additional testing was conducted to ensure that there was no variation based on gender, as nine study participants were female and nine were male. The successfulness of this first study conducted with the newly constructed instrumented vehicle creates the opportunity for a variety of additional studies to be conducted in the future.     

BP神经网络在女性假人颈部标定试验中的应用

采用BP神经网络代替响应曲面法的多项式函数,建立了基于BP神经网络的女性假人颈部减速特性模型.该模型以摆锤冲击速度、标定温度、蜂窝铝孔数、蜂窝铝切割形式为输入,10ms时刻颈部减速度为输出,实现了颈部减速特性的拟合预测功能.两种方法的预测结果表明,基于BP神经网络法的预测误差最大值为0.04m/s,而响应曲面法的预测误差最大值为0.05 m/s.     

479Q汽油机电控参数标定研究

利用AVL PUMA OPEN汽车动力测试台架对479Q发动机进行稳态电控参数的标定。为了寻求ECU与发动机的最佳配合,利用神经网络建立电控参数预测模型,通过对神经网络模型进行训练预测出稳态工况下发动机连续的ECU控制参数,并进行检验。研究结果表明,该预测模型具有较强的泛化能力,能够准确地预测出发动机电控参数。     

FDR技术在黄土路基水分测定中的应用

首先介绍了FDR(Frequency Domain Reflectometry)频域反射用于测量土壤水分的基本原理.接着对压实度为95%的西安黄土体积含水率进行了实验室标定,得出了标定曲线.最后在建成的室内路基实物模型中进行了实际应用.分析结果显示:对于体积含水率在27%至42%之间的路基土,FDR测量结果和烘干法测量...     

基于CCP协议的电控发动机监控标定系统开发

CCP协议是一种基于CAN总线的匹配标定协议,其可靠性和稳定性高,应用范围越来越广.通过采用Labview开发了基于CCP协议的上位机标定监控软件,利用CCP DRIVER实现了下位机与上位机的通讯,实现了数据上传和下载等相关功能.采用本标定系统进行的电控发动机监控标定试验表明该套系统实时性和可靠性好,能够满足发动机标...     

基于变形测量的舰船航向标校方法

为了解决目前航向标校中的船体变形无法克服和采样时间不同步的问题,根据单摄像机三维姿态测量原理,通过若干台摄像机经过多层甲板的传递测量,最后综合各级接力站测量的结果可以得到安装在甲板层艏艉线上的参考物相对于安装在导航平台上的摄像机系统的姿态角,从而减小船体变形对航向标校的影响。并利用软件定时器进行同步录取解决读数时间不同步问题。通过理论分析表明,该方法可有效的提高测量精度,并可拓展使用到所有基座不通视的被试武器系统和测量设备之间的三维姿态测量。