外夹式超声流量计单声道测量理论分析与实验
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摘要
本文针对外夹式超声流量计单声道测量原理进行分析,以声波在流动介质中传播的时间差与流速的关系以及折射定律为原理,得出流量Qv与探头安装距离L的数学模型;通过测算,验证了安装距离L数学表达式的正确性;最后通过管道实验,流量随着设定管壁厚度δ的增大而减小,且在不同流量下,相对示值误差的变化趋势一致;根据实验数据,进行相对示值误差E相对于管壁厚度δ的3阶多项式曲线拟合,得出R~2都趋近于1,说明了实验数据具有一定的参考价值。
In this paper,the principle of single track measurement of an external clip type ultrasonic flow meter was analyzed. Based on the relation between the time difference of sound wave propagation in the medium and the flow velocity,and the refraction law,The mathematical model of flow and probe installation distance L was obtained;The correctness of the mathematical expression of installation distance L was verified through calculation. At last,the flow decreases with the increase of the designated wall thickness δ,and the trend of relative error is the same at different flow rates by pipe test. According to the experimental data,The 3 rd-order polynomial curve fitting of the relative display error E relative to the wall thickness δ is used,obtain that R_2 was close to 1,indicating that the experimental data had a certain reference value.
In this paper,the principle of single track measurement of an external clip type ultrasonic flow meter was analyzed. Based on the relation between the time difference of sound wave propagation in the medium and the flow velocity,and the refraction law,The mathematical model of flow and probe installation distance L was obtained;The correctness of the mathematical expression of installation distance L was verified through calculation. At last,the flow decreases with the increase of the designated wall thickness δ,and the trend of relative error is the same at different flow rates by pipe test. According to the experimental data,The 3 rd-order polynomial curve fitting of the relative display error E relative to the wall thickness δ is used,obtain that R_2 was close to 1,indicating that the experimental data had a certain reference value.
引文
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[7]JJG1030-2007《超声波流量计》[S].
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[14]孙钟.温度对超声波声速影响的研究[A].中国钢结构协会(China Steel Construction Society)、国家钢结构工程技术研究中心(National Research Center for Steel Construction).'2011全国钢结构学术年会论文集[C].中国钢结构协会(China Steel Construction Society)、国家钢结构工程技术研究中心(National Research Center for Steel Construction):中国钢结构协会,2011:4.
[15]ZHANG X T,MAO Q M,NIE Z G,et al.A study of composite flow meter based on the theory of electro-magnetic and ultrasonic[J].Applied Mechanics&Ma-terials,2014(568~570)309~314.
[16]DRENTHEN J G,KURTH M,VAN KLOOSTER J,et al.Reducing installation effects on ultrasonic flow me-ters[C].//27th International North Sea Flow Measurement Workshop,2009:1~20.
[17]许德福,王涛,马磊.不同介质下气体超声波流量计计量特性分析[J].工业计量,2017,27(06):17~18.
[2]HermannMüllcr,漆平生.检测纯净液体和高度污染液体用的超声流量计[J].国外计量,1980(06):40~42+34.
[3]段慧明,翟秀贞.超声流量计的应用与展望[J].计量技术,1995(06):23~26.
[4]王志和.超声波流量测量[J].国外计量,1985(02):36~40.
[5]胡江顺,何松杰.管道参数对便携式超声波流量计测量的影响[J].计量技术,2001(09):7~8.
[6]李晓宇,王顺利,孟涛.管道壁厚测量对便携式超声波流量计检定结果的影响分析[J].中国计量,2015(08):95~96.
[7]JJG1030-2007《超声波流量计》[S].
[8]PT878便携式超声波中文操作手册(修改).
[9]https://baike.baidu.com/item/便携式超声波流量计/10966072.
[10]KIRILLOV K M,NAZAROV A D,MAMONOV V N,et al.An ultrasonic flowmeter for viscous liquids[J].Measurement Techniques,2014,57(5):533~536.
[11]HU L,QIN L,MAO K,et al.Optimization of neural network by genetic algorithm for flowrate determination in multipath ultrasonic gas flowmeter[J].IEEE Sensors Journal,2016,16(5):1158~1167.
[12]陈国宇,刘桂雄.时差式超声流量计单声道结构分析[J].中国测试,2018,44(03):73~77.
[13]刘桂雄,陈国宇,朱斌庚,等.考虑覆盖率下时差式超声流量计的平面声道模型[J].华南理工大学学报(自然科学版),2014,42(1):1~5.
[14]孙钟.温度对超声波声速影响的研究[A].中国钢结构协会(China Steel Construction Society)、国家钢结构工程技术研究中心(National Research Center for Steel Construction).'2011全国钢结构学术年会论文集[C].中国钢结构协会(China Steel Construction Society)、国家钢结构工程技术研究中心(National Research Center for Steel Construction):中国钢结构协会,2011:4.
[15]ZHANG X T,MAO Q M,NIE Z G,et al.A study of composite flow meter based on the theory of electro-magnetic and ultrasonic[J].Applied Mechanics&Ma-terials,2014(568~570)309~314.
[16]DRENTHEN J G,KURTH M,VAN KLOOSTER J,et al.Reducing installation effects on ultrasonic flow me-ters[C].//27th International North Sea Flow Measurement Workshop,2009:1~20.
[17]许德福,王涛,马磊.不同介质下气体超声波流量计计量特性分析[J].工业计量,2017,27(06):17~18.