基于离散时差检测的流量计不同步计数误差补偿技术-中国测试.pdf

第43卷第1期 中国测试 Vol.43 No.1 2017年 1月 CHINA MEASUREMENT TEST January，2017 doi院10.11857/j.issn.1674-5124.2017.01.005 基于离散时差检测的流量计不同步计数误差补偿技术 江境宏袁 刘桂雄袁 黄 坚 （华南理工大学机械与汽车工程学院，广东 广州 510640） 摘 要院为缩小计数误差、提高流量标准装置计量精度，基于离散时差检测提出一种无需信号预处理的流量计不同步 计数误差补偿技术。首先，根据多工位流量计脉冲计数原理，提出基于时差检测的计数误差补偿机理；其次，根据流量 计脉冲离散信号特性，推导得多工位脉冲计数误差补偿的离散形式；最后，在具有4 台流量计的多工位流量计标准装 置中实现工程应用，并进行模拟试验与工程应用试验。结果表明：在脉冲信号周期稳定的模拟试验中，经补偿后脉冲 计数误差小于0.0077个，在工程应用中，经补偿后脉冲计数误差小于0.0432个。 关键词院流量计；脉冲计数补偿；多路不同步信号；离散时差 文献标志码院A 文章编号院1674-5124渊2017冤01-0023-04 Asynchronous counting error compensation technique for flowmeters based on discrete time difference detection JIANG Jinghong，LIU Guixiong，HUANG Jian （School of Mechanical Automotive Engineering，South China University of Technology， Guangzhou 510640，China） Abstract: In order to reduce counting error and improve the measurement accuracy of flow device， an asynchronous counting error compensation technique for flowmeters based on discrete time difference detection which does not require preprocessing procedures is proposed. Firstly，according to the pulse counting principle of multichannel flowmeters，a counting error compensation technique is delivered based on discrete time difference detection. Then，the discrete form of pulse counting error compensation for multi-position is derived in view of the characteristic of pulse discrete signal of flowmeter. At last，engineering applications and simulation tests are conducted in a multi-station meter standard device with four flowmeters. The results show that，in the simulation tests of pulse si