基于GPS技术的儿童定位和报警电路的设计与制作

利用 GPS 技术、单片机和射频通信技术,完成了儿童定位和报警电路的设计与制作.本电路解析 GPS数据获得儿童的位置、速度信息,SD 卡存储轨迹信息,8位 ATmega 单片机完成距离的计算和逻辑判断,射频收发芯片完成儿童与监护人之间的数据传送,实现两者之间应答式的实时定位监护.     

就地冷再生技术在沥青路面大修工程中的应用

通过采用就地冷再生技术在沥青路面大修工程中的应用实践,对这种技术的主要特点、质量控制过程进行了重点介绍,供业内同行参考。     

基于LabVIEW的电机转子无线测温系统性能研究

本文提出了一种新颖的在线监测电机转子温度的无线测温方法,解决了信号传递、引线、抗干扰以及温度采集装置的机械强度等一系列问题,并进行了系统深入的研究和测试,结果表明,该系统具有结构简单,安装方便,抗干扰性强,性能可靠,测温精度高的优点.     

Assessing the impact of the built environment on travel behavior: a case study of Buffalo,New York

Assessing the impact of characteristics of the built environment on travel behavior can yield valuable tools for land use and transportation planning. Of particular interest are planning models that can estimate the effects of ‘smart growth’ planning. In this paper, a post-processor method of quantifying and searching for relationships among many aspects of travel behavior and the built environment is developed and applied to the Buffalo, NY area. A wide scope of travel behavior is examined, and over 50 variables, many of which are based on high-detail data sources, are examined for potentially quantifying the built environment. Linear modeling is then used to relate travel behavior and the built environment, and the resulting models may be applied in a post-processor fashion to travel models to provide some measure of sensitivity to built environment modifications. The study’s findings demonstrate that mode choice is highly correlated to measures of the built environment, and that many of the principles of smart growth appear to be a valid way to encourage non-vehicle travel. Home-based VHT and VMT appear to be affected by the built environment to a lesser degree.     

某重型汽车动力性与燃油经济性仿真与匹配优化

根据某重型汽车的结构参数,按照动力传递路线,利用GT-DRIVE软件对该重型汽车进行了建模仿真,并分析了其动力性和燃油经济性。仿真结果与试验结果的对比验证了该整车模型的正确性。将此模型导入modeFRONTIER优化软件,采用多目标遗传算法对该车的传动系统参数进行优化,从优化方案中选取几种方案进行比较分析,并根据实际使用的需要确定了该车动力传动系统的最佳匹配方案。     

汽车安全气囊检测装置动态特性的仿真研究

对目前普遍使用的三分力气囊检测装置建立了动态模型并进行仿真。结果表明:当阻尼比为0.6,固有频率和阻尼比的相对变化量皆为1%时,模型相对误差可达4.5%以上。该模型误差不容忽略,但采用峰值叠加和增大检测装置阻尼比的措施可减小此误差。     

火灾下钢筋混凝土构件的弹塑性本构模型

在弹塑性理论的基础上,考虑了材料性能随温度的变化,应用J2流动理论导出了高温下钢筋混凝土构件弹塑性增量本构模型,编制了该模型的有限元求解程序.该模型具有明确的物理意义,表达形式规范,便于数值手段实现.数值计算结果与现有的试验模型基本吻合.     

Numerical study of ice-induced loads on ship hulls

A numerical model is introduced in this paper to investigate both global and local ice loads on ship hulls. This model is partly based on empirical data, by which the observed phenomena of continuous icebreaking can be well reproduced. In the simulation of a full-scale icebreaking trial, the interdependence between the ice load and the ship’s motion is considered, and the three degree-of-freedom rigid body equations of surge, sway and yaw are solved by numerical integration. The variations in the level ice thickness and in the strength properties of ice can also be taken into account. The simulated ice loads on ship hulls are discussed through two case studies, in which the ship’s performance, the statistics of ice-induced frame loads, and the spatial distribution of ice loads around the hull are analyzed and compared with field measurements. As far as we know the present paper is the first to integrate all the features above. It is hoped that further studies on this numerical model can supplement the field and laboratory measurements in establishing a design basis for the ice-going ships especially for ships navigating in the first-year ice.     

利用MATLAB进行冲淤变化分析计算

Matlab作为高级计算机语言,在数据可视化、数据分析以及数值计算等方面具有独特的优势。本文利用Matlab这些特点,编写程序对某特定海域进行冲淤变化分析计算,及时地掌握特定海域的冲淤情况,更好地为港口疏浚决策服务。     

基于有序加权平均算子的信号交叉口通行能力优化算法

分析国内现有的3种典型的信号交叉口通行能力计算方法,阐述有序加权平均算子理论及其赋权方法,以信号交叉口的通行能力为决策因子,建立了一种信号交叉口通行能力优化算法。通过对南京市某一信号交叉口进行实际调查并进行通行能力计算,结果表明：经有序加权平均算子理论综合加权优化后的信号交叉口通行能力与传统计算方法相比,具有更高的精度。