数字式涡街流量计应用中关键问题的研究  

Study on Key Issues in the Application of Digital Vortex Flowmeter

作　　者：朱志海[1] 徐科军[1] 刘三山[1] 

机构地区：[1]合肥工业大学自动化研究所,安徽合肥230009

出　　处：《自动化仪表》2009年第1期10-12,15,共4页Process Automation Instrumentation

基　　金：国家863计划项目(编号:2007AA04Z180)

摘　　要：对基于谱分析的数字式涡街流量计在应用中响应速度比较慢及其在小流量或小口径时流量计输出波动两个问题进行了深入分析。采用设置门限值的方法提高了系统响应速度。对频谱分析结果进行多次为0判断,解决了系统输出断续问题。通过对频谱分析结果的限幅,在平均时去掉超过标准差的频率值,并去掉最大值和最小值,对平均结果进行第二次平均的方法减小了系统输出的波动,提高了流量计输出稳定性。Two key problems in applications of vortex flowmetes with spectrum analysis are studied carefully. One is slow response speed, and the other is big output fuctuation when the flow rate or the diameter of meter is small. The threshold is set to increase the response speed of the meter. The results of spectrum analysis are analyzed for determining the number of zero value in order to solve the output interruption. A series of processing procedures, i.e. limiting the amplitude of spectrum analysis results, removing the frequency values that exceed the standard deviation, removing the maximal and minimal values, and performing the second average, are proposed to reduce the output fluctuation of meter and improve the stability.

关 键 词：涡街流量计 数字信号处理器 频谱分析 响应速度 输出断续 输出波动 

分 类 号：TP216.1[自动化与计算机技术—检测技术与自动化装置]