基于双声道的低压超声气体流量计数据融合方法

doi:10.3969/j.issn.1000-1158.2021.07.07

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摘要针对双声道的超声流量测量计测量低压中小管径流量时,超声波信号在低压气体中衰减大、信噪比低,导致某一声道的测量数据产生较大误差或错误,从而降低超声气体流量计测量的准确性和稳定性的问题,提出了一种时差法的双声道超声流量计数据融合方法。该方法首先对单一声道的时差数据进行粗大误差剔除和流量计算后,然后对数据进行预估处理获得流量状态,最后采用改进的卡尔曼融合方法计算管道内的平均流量,从而实现双声道气体超声流量计的数据融合和故障的判断。实验证明该方法的测量相对误差和重复性分别为-0.58%和0.21%。

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	赵伟国
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	章涛

关键词 ：计量学, 双声道超声波流量计, 时差法, 卡尔曼融合, 低压气体, 状态预估

Abstract：The double-channel ultrasonic flow measurement is conventionally applied in low-pressure gas of the small and medium pipes. However, the error data and wrong data of one channel will be produced by the high attenuation and low signal-to-noise ratio when the ultrasonic signals travel in the low-pressure gas. So the accuracy and stability of ultrasonic flowmeter will be decreased. In order to solve these problems, a fusion method of double-channel ultrasonic flowmeter based on time-difference is proposed. Firstly, the gross errors of time-difference data are eliminated and flowrate is calculated in every channel. Then, the state of the flowrate is estimated by time-difference data. Finally, the improved Kalman data fusion is adopted to calculate the mean flowrate in pipe. The experimental results show that the measurement error is -0.58% and the repeatability is 0.21%.

Key words： metrology double-channel ultrasonic flowmeter time-difference method Kalman fusion low pressure gas state estimation

收稿日期: 2019-10-02 发布日期: 2021-07-15

PACS:

TB937

基金资助:国家市场监督管理总局科技计划项目(2019MK146)

通讯作者: 卜勤超(1995-),男,浙江嘉兴人,中国计量大学在读硕士研究生,主要研究方向为流量计量测试和智能化仪表。Email: buqinchao@163.com E-mail: buqinchao@163.com

作者简介: 赵伟国(1973-),男,陕西蓝田人,中国计量大学副教授,硕士生导师,主要从事自动检测技术和智能仪表方面的研究。Email: zjufriendly@cjlu.edu.cn

引用本文:

赵伟国,卜勤超,姚海滨,章圣意,章涛. 基于双声道的低压超声气体流量计数据融合方法[J]. 计量学报, 2021, 42(7): 873-878.
ZHAO Wei-guo,BU Qin-chao,YAO Hai-bin,ZHANG Sheng-yi,ZHANG Tao. A Data Fusion Method of Double-channel Ultrasonic Flowmeter Application in low pressure Gas. Acta Metrologica Sinica, 2021, 42(7): 873-878.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2021.07.07 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2021/V42/I7/873

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