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%。
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%.
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
Key words
metrology /
double-channel ultrasonic flowmeter /
time-difference method /
Kalman fusion /
low pressure gas /
state estimation
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基金
国家市场监督管理总局科技计划项目(2019MK146)
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