Feasibility of localizing in vivo micro-devices with electromagnetic methods

In order to measure the location of medical micro-devices in the gastrointestinal tract, electromagnetic methods were developed considering the magnetic permeability of human bodies. Two varieties of electromagnetic localization methods have been implemented： one uses direct current（DC） to generate the electromagnetic field, and the other uses alternating current （AC）. The two varieties of the localization principle were analyzed and relevant experiments were made. The experiments show that the alternating electromagnetic method acquires higher accuracy, higher stability and wider measurement range.     

基于Labview的汽车油耗检测平台

通过对油耗检测技术进行研究,以Labview软件为开发平台,建立了油耗值计算的数据库系统,研制出一套不解体油耗检测系统.     

实现道路驾驶技能考试自动化的技术基础

实现驾驶人实际道路考试的自动化,需要采集驾驶人、考车及周边静态物体、动态物体的各种参数,仅使用传统的传感检测技术难以满足要求.载波相位实时动态差分(RTK)GPS定位技术、超声波动态测距技术和驾驶人视线方向视频检测技术是三种新的检测技术,可大大提高实际道路考试的自动化检测率,提高整个实际道路考试系统的自动化考试程度,且能保证考试要求的检测精度和实时性要求.     

异形钢桥塔高程精密测量技术

针对传统桥塔高程测量方法受场地、环境等因素影响较大无法满足异形桥塔高程测量要求的问题,本文结合永定河特大桥桥塔高程测量的实际需求,提出了一种基于正负压力变送器测量桥塔倾斜端口高差的方法,并介绍其计算分析方法.全站仪地面竖向高程传递+端口正负压力变送器测量倾斜端口高程的测量方法克服了传统方法中要求测试端口基本平直的限制;温度引起的液态水密度变化会对压力变送器测量高差的精度产生较大影响;通过测量已知基准点高差反算液体密度取值可减小温度影响产生的误差;该测量方法能够满足高度大于100 m的异形桥塔高程精确、快速测量的要求.     

一种量测型组合导航系统的设计与实现

文章以滤波技术为核心,根据测量舰船的实际需求,设计了一种量测型组合导航系统,并详细地介绍了系统的设计原则、硬件组成、软件设计和实现方法。     

Modelling and validation of coupled high-speed maglev train-and-viaduct systems considering support flexibility

This study presents a more realistic modelling of the maglev-based high-speed railway line in Shanghai, China. Focus is placed on an accurate simulation of the two subsystems: the train subsystem including the magnets and the viaduct subsystem including the modular function units of the rails. The electromagnet force–air gap model with a proportional-derivative (PD) controller is adopted to simulate the interaction between the maglev train via its electromagnets and the viaduct via its modular function units. The flexibilities of the rails, girders, piers and associated elastic bearings are all considered in the modelling of the viaduct subsystem to investigate their effects on an interaction between the two subsystems. By applying the proposed model to the Shanghai maglev line, the essential characteristics of the coupled system can be duly captured. The accuracy and effectiveness of the proposed approach are then validated by comparing the computed dynamic responses and frequencies with the measurement results. It is confirmed that the proposed modelling with a detailed simulation of the magnets and modular function units can duly account for the dynamic interaction between the train and viaduct systems. Moreover, the effects of the inclusion of the flexibilities of the rails, girders and elastic supports to the response of the coupled system are respectively investigated, the results of which prove that their involvements are essential to the accurate prediction of the response of the coupled maglev train–viaduct system.     

汽车用车速表不确定度评估

以YT1100型道路性能测试仪对标致牌DC7169TSAB型乘用车的车速表示值进行检测,并对其结果进行不确定度的简化评估为例,探讨车速表示值的检测结果不确定度的评估。     

高寒高海拔隧道保温层敷设方式及设计参数优化

为了深入探究高寒隧道保温层敷设方式及其设计参数优化的问题，以高寒高海拔特长珠角拉山隧道工程为背景，通过数值模拟重点研究了保温层敷设方式、设计厚度及导热系数参数的选择，并讨论了当地气温变化与保温层设计参数的关系。研究结果表明：在寒区隧道保温层设防区段，贴壁式敷设方式最佳；随着保温层厚度的增加，洞内冷空气影响范围逐渐减小，调热圈径深随保温层厚度变化的趋势用公式表达为f（x_h）=3.039e^{-0.280 9x_h}+13.8e^{-0.009 322x_h}；基于调热圈径深随保温层厚度增加的变化速率曲线及隧道结构安全，建议保温层厚度设计为5~10 cm；随着保温材料导热系数的增大，洞内冷空气影响范围逐渐增大，调热圈径深与导热系数关系趋势用公式表达为f（x_λ）=15.47e^{0.287 4x_λ}-3.829e^-39.05x_λ；基于调热圈径深随导热系数变化速率曲线及隧道结构安全，建议保温材料导热系数取0.020~0.035 W·（m·K）^-1；在假定保温层厚度为5 cm，导热系数为0.022 2 W·（m·K）^-1，通风时间4个月的情况下，只有当洞内气温大于-15℃时才能保证支护结构和围岩不受冻害影响。研究成果可为川藏铁路建设提供指导作用。     

冷天气起飞时的高度修正研究

对飞机在冷天气起飞时是否应该对高度进行修正问题进行了研究，通过理论分析和实际计算证明：由于冬季低温天气实际温度大大低于标准大气温度，几何高度可能比气压高度低几百英尺甚至更多。因此，冷天气起飞时应该对改平高度进行修正。文中给出了冷天气高度修正的通用计算方法，并以波音公司的图表为例介绍了冷天气高度修正方法。     

Origin软件在隧道监控量测数据处理中的应用

介绍Origin软件的基本功能及其应用。利用Origin软件实现了对量测数据的绘图、非线性拟合等处理,获得可靠的参数及直观的图形。以石龙山隧道施工监控中量测数据处理的实例,并据此指导了隧道的开挖作业和支护结构的设计与施工。