| 黄云志,翟丽文,吴 晨,杨双龙.面向强周期振动干扰的涡街流量计系统研制[J].电子测量与仪器学报,2023,37(8):105-112 |
| 面向强周期振动干扰的涡街流量计系统研制 |
| Development of vortex flowmeter system for stron periodic vibration interference |
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| DOI： |
| 中文关键词: 涡街流量计 周期振动干扰 差动式电荷放大器 频移策略 频率方差 |
| 英文关键词:vortex flowmeter periodic vibration differential charge amplifier frequency shift strategy frequency variance |
| 基金项目:安徽省科技重大专项(18030901040)项目资助 |
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| 中文摘要: |
| 涡街流量计是流体振动型流量仪表,易受管道振动、流场扰动等影响,在小流量条件下测量误差较大,尤其在强振动干
扰下涡街信号被淹没,无法准确测量。 本文研制抗强周期振动干扰的涡街流量计系统,采用带有电压负反馈的差动式电荷放大
器,提高小流量信号的放大能力;提出基于频移策略的频率方差算法,减少强周期振动干扰的影响。 首先通过频移策略降低相
近频率的影响,然后根据流量信号与周期振动干扰的频带宽度不同,通过计算和比较频率方差,判定流量信号频率。 研制了涡
街流量计信号处理系统并实验,结果表明,研制的系统扩展了量程下限,且在强周期振动干扰条件下可以准确提取信号,精度提
升 1 个数量级。 |
| 英文摘要: |
| Vortex flowmeter is a fluid vibration flow meter, which is easily affected by pipeline vibration and flow field disturbance. The
measurement error is large under the condition of small flow rate, especially under the interference of strong vibration, vortex signal is
submerged, and it cannot be accurately measured. In this paper, a vortex flowmeter system which is resistant to strong periodic vibration
is developed. Differential charge amplifier with negative voltage feedback is used to improve the ability of discharge flow signals. A
frequency variance algorithm based on frequency shift strategy is proposed to reduce the influence of strong periodic vibration. Firstly,
the influence of similar frequencies is reduced by frequency shift strategy. Then, according to the frequency band width of traffic signal
and periodic vibration interference, the frequency of traffic signal is determined by calculating and comparing the frequency variance.
The signal processing system of vortex flowmeter is developed and tested. The results show that the developed system extends the lower
limit of range and can accurately extract signals under the condition of strong periodic vibration interference, and the accuracy is
improved by one order of magnitude. |
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