靶式流量计动态标定装置设计方案的探讨

Investigation of the Design Scheme for Dynamic Calibration Device of the Target Flowmeter

针对靶式流量计在非定常流中无法确保其准确度与可靠性的问题,阐述了对靶式流量计进行动态标定的必要性。基于对靶式流量计结构特点与工作原理的认识,提出对靶式流量计进行动态标定的三种装置设计方案。根据标定信号的类型,将三种方案分为随机信号法、脉冲信号法和负阶跃信号法。通过对这三种信号标定装置设计方案的优缺点的比较,得出负阶跃信号法为最佳设计方案。负阶跃信号法具有简单可靠、可行性高且成本低廉等特点,可实现靶式流量计的动态标定。

In unsteady flow, the accuracy and reliability of target flowmeter are unable to be ensured, aiming at this problem, the necessity of dynamic calibration for target ilowmeter is elicited. Based on the knowledge about structural features and operating principle of target flowmeter, three kinds of the design schemes for dynamic calibration of target flowmeter are proposed. In accordance with the types of calibration signals, there are random signal method, pulse signal method, and negative step signal method. Through comparing the advantages and disadvantages of these three types of calibration devices, it is found that the negative step signal method is the best scheme. This method features simple, reliable, low cost and more flexible, so it can be used to implement dynamic calibration of target flowmeter.