基于LabVIEW的钢轨阻抗特性测量系统

Rail Impedance Measurement System Based on LabVIEW

中文关键词:  高速铁路  轨道电路  钢轨阻抗测量  LabVIEW  专业声卡  专业功放

英文关键词:high speed railway  track circuit  rail impedance measurement  LabVIEW  professional soundcard  professional amplifier

中文摘要:

      改进型多特征脉冲轨道电路可以较完善地解决原有站内轨道电路“分路不良”问题。钢轨作为它的主要部件，分析其阻抗特性随不同频率信号的变化情况，对该电路电气特性的分析与优化设计具有重要意义。但是，已有的阻抗测试方法或系统只能对单点频率下的钢轨阻抗进行测量。针对该问题，在LabVIEW软件平台下，构建了一款基于专业声卡的轨道电路钢轨阻抗测量系统。该系统能够实现一定频带扫频下，各频点钢轨阻抗值的实时测量。采用多通道数据采集，具有测量精度高、频响范围宽等优点。将从硬件和软件的设计与实现等方面对系统结构及功能进行介绍，并通过测量实例说明该测量系统在阻抗测试方面的优势。

英文摘要:

      The modified multi-features impulse track circuit is dedicated to solving shunt-fault problems confronted by traditional track circuit installed in station.Rail is a primary component of this track circuit.Analysis of rail impedance characteristics under continuous different frequency signals is very meaningful for electrical characteristics analysis and optimal design of this track circuit.However,the existing measurement systems for impedance characteristics can be only applicable to single-point frequency case.In the framework of LabVIEW,a new system with professional soundcard is developed for achieving impedance measurement of rail or other metal conductors under sweep frequency signals.It can be characterized by multichannel data acquisition,high accuracy and wide frequency range.The system structure and function are introduced from designs of hardware and software.Finally,some measuring examples illustrate predominance of its performance.