| 张伟星,李建民,薛鹏飞,侯文,王高,刘争光.细管道中流速的超声相关法测量[J].声学技术,2021,40(1):64~70 |
| 细管道中流速的超声相关法测量 |
| Ultrasonic correlation measurement of fluid velocity in a fine pipeline |
| 投稿时间：2019-09-23 修订日期：2019-11-05 |
| DOI：10.16300/j.cnki.1000-3630.2021.01.010 |
| 中文关键词: 流速 超声波测量 相关函数法 细管道 |
| 英文关键词: fluid velocity ultrasonic measurement correlation function method fine pipeline |
| 基金项目:山西省应用基础研究项目（201701D121061） |
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| 中文摘要: |
| 针对应用常规超声波方法测量极小管径（5 mm及以下）中流体速度的精度较低问题，文章应用相关函数法精确测量时延，降低噪声对测量结果的影响，提高了极小管径中流体速度的测量精度。首先，利用COMSOL Multiphysics有限元仿真软件建立管道传输模型，然后将被顺、逆水流影响后的超声波波形数据分别导入Matlab软件，用插值法处理后做相关计算，得到较为精确的时延，最后计算极小管径管道的流速。结果显示：相关函数法处理插值后的仿真数据可以得到较为精确的时延，对噪声具有一定的抑制能力。使用插值处理数据时，插值点越多即插值点间隔时间越小，测量精度越高，但是插值间隔太小会导致抗干扰能力降低。 |
| 英文摘要: |
| For the low accuracy of the common ultrasonic method in measuring the flow velocity in the pipeline with a very small diameter (below 5 mm), a correlation function method, which can accurately measure the time delay and reduce the influence of noise on the measurement results, is proposed in this paper for improving the accuracy of measuring flow velocity. First, the COMSOL Multiphysics finite element simulation software is used to establish the pipeline transmission model, then the ultrasonic waveform data of forward and reverse flows are respectively introduced into Matlab, and the correlation calculation is performed by the interpolation method to obtain a more accurate time delay, and finally the flow velocity in the pipeline with very small diameter pipes is calculated. The results show that the correlation function method combined with data interpolation can obtain a more accurate time delay and has a certain ability to suppress noise; the more interpolation points, the higher the resolution, but the anti-interference ability would decrease for too dense interpolation. |
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