一种实时轨道监测无线传感器网络与服务模型研究

列车在运行时,对轨道和路基等的承载设施进行全面监测并将获取的信息实时传送给机车操控人员和列车运行监控记录装置具有重要的科研和实用意义。以此为背景,本文建立一种多网关移动条件下对线路进行实时监测的无线传感器网络模型,描述网络的结构、定义传感数据生成的服务等级划分规则和数据的传输流程。提出一种在网关运动条件下基于相对位置信息的网络功率控制方法并进行相应的通信协议设计。仿真结果表明,在选择合理的底层通信协议的条件下,该网络能够保证监测数据的可靠传输,并满足节能和实时性要求。     

车用雨量传感器应用

介绍目前乘用车用雨话传感器的工作方式．着重阐述红外散射式雨量传感器的工作原理、整车连接方式，并对传感器的具体实现方案进行讨论：     

Development of a new time domain-based algorithm for train detection and axle counting

This paper presents an innovative train detection algorithm, able to perform the train localisation and, at the same time, to estimate its speed, the crossing times on a fixed point of the track and the axle number. The proposed solution uses the same approach to evaluate all these quantities, starting from the knowledge of generic track inputs directly measured on the track (for example, the vertical forces on the sleepers, the rail deformation and the rail stress). More particularly, all the inputs are processed through cross-correlation operations to extract the required information in terms of speed, crossing time instants and axle counter. This approach has the advantage to be simple and less invasive than the standard ones (it requires less equipment) and represents a more reliable and robust solution against numerical noise because it exploits the whole shape of the input signal and not only the peak values. A suitable and accurate multibody model of railway vehicle and flexible track has also been developed by the authors to test the algorithm when experimental data are not available and in general, under any operating conditions (fundamental to verify the algorithm accuracy and robustness). The railway vehicle chosen as benchmark is the Manchester Wagon, modelled in the Adams VI-Rail environment. The physical model of the flexible track has been implemented in the Matlab and Comsol Multiphysics environments. A simulation campaign has been performed to verify the performance and the robustness of the proposed algorithm, and the results are quite promising. The research has been carried out in cooperation with Ansaldo STS and ECM Spa.     

一种低成本计轴设备

西门子公司针对中国市场研发了一种低成本计轴设备,计轴主机仅采用1个模块构成,可处理2个室外检测点的信息,给出2个区段的状态。将简要介绍该计轴设备。     

一种嵌入式航海数据采集系统方案设计

本文首先研究了基于无线传感器组网的数据采集系统以及其中的技术逻辑,分析了航海雷达数据的特性。针对雷达数据的高频采样率,本文设计一种新的多通道组网方式来处理航海雷达回波的数据采集方案,并给出雷达数据的采集汇聚算法,该算法对舰队组网中的节点进行规划,通过相邻节点组成簇,来提高数据采集的实时性。最后基于此系统所采用的多通道组网方式以及汇聚算法设计了基于DSP的嵌入式仿真系统,验证了该多通道组网方式以及汇聚算法的有效性。     

基于无线传感器网络的船舶识别方法

本文总结了基于无线传感器网络的船舶识别方法,并进行可行性分析,提出基于Zig Bee的无线传感网络身份自动识别技术。理论分析表明,基于WSN的船舶识别技术具有良好的兼容性、抗干扰性和安全性,对船舶产业的发展具有很好的促进作用。     

汽车胎压采集模块的设计与研究

现在由于轮胎引起的汽车事故是越来越多,特别是在夏天高温的路面上高速行驶的汽车。因此,轮胎的安全性对于汽车的安全性至关重要。本文论述了通过基于无线通信模块和压力传感器的汽车胎压采集模块的硬件和软件的设计与研究,可以为我们的汽车用户提供实时的胎压数据。从而有效的防止因为轮胎而带来的交通事故。     

A Research for Error Compensation Algorithm of Dual Range Pressure Sensor

Large range-high precision measurement has always been a challenge in the field of mechanical measurements. This paper built the input-output differential equation of Dual Range Pressure Sensor(DRPS) and gave an error compensation algorithm of DRPS after analyzing the mathematical model of DRPS. For a given situation, dynamic measurement errors of sensor parameters can be compensated by this method. Finally the accuracy and feasibility of the method were verified using Adams Software.     

基于分布式传感光纤的隧道二次衬砌全寿命应力监测方法

应用气吹灌浆铺设技术将分布式光纤传感器埋入二次衬砌混凝土内部,并将光纤传感器时变应力场监测结果与施工初期埋入的传统传感器初始应力场叠加,得到隧道二次衬砌的长期真实应力水平;通过对采用气吹灌浆铺设的光纤传感器进行标定试验,对二次衬砌长期应力场的监测断面进行应力水平分析,提出将时间序列分析方法应用于所有监测断面健康状态评估。结果表明:所提出的方法能够实现对隧道二次衬砌的全寿命健康诊断与评估。     

混合动力汽车制动踏板位移传感器的故障诊断

混合动力汽车的怠速停机、制动能量回馈等功能都需要制动踏板位移信号作为输入判定条件,因此有必要对制动踏板位移传感器信号的有效性进行监控,以正确识别其工作是否正常。如果不正常,那么是哪种失效方式?针对具体的失效方式采用相应的故障处理方式,以保证混合动力系统工作稳定。本文系统地介绍了荣威750BSG混合动力汽车制动踏板位移传感器的短路、断路、合理性和零点漂移等故障的诊断方法,提供了一整套针对制动踏板系统的安全监控方法。