基于K-L散度液位自适应判定的乌式粘度仪系统设计
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摘要
针对传统乌式粘度仪测量数据操作性差、液位检测自动化程度有限的弱点,设计一种液位自适应判定乌氏粘度仪。通过分析粘度仪的测量原理,根据吸液液位检测信号特征,提出基于K-L散度的吸液液位自动判定方法。设定液位到达计时刻度线会存在一个标志点,首先利用K-L散度方法获取标志点所在的液位检测信号窗口,采用格罗布斯准则自动判定窗口中标志点的位置,然后根据标志点计算计时起点或计时终点;再通过计时时间差进行吸液过程的流速估计,完成吸液自动判定。结合嵌入式UCOSIII操作系统和em Win图形库设计粘度仪系统,在触摸屏交互界面上实现数据的实时输入与显示。应用与实验结果表明,该粘度仪满足国家粘度测试标准,重复性优于0.35%,测量误差优于0.1%,并能进行直观的触摸界面操作,仪器显示界面友好。
Aiming at the disadvantages of traditional Ubbelohde viscometer has poor data interoperability and limited automation,an adaptive liquid level determination Ubbelohde viscometer instrument is designed. By analyzing the viscosity measurement principle of Ubbelohde viscometer,a new method for automatic suction fluid level detection with K-L Divergence is developed,which is based on the feature of the liquid level. Setting there is a mark point when the liquid level is reached at timing point line. First,the liquid level detection signal window is acquired by K-L divergence method,the mark point is automatically determined by Grubbs criterion,then the start point and stop point are obtained and the flow velocity is estimated based on timing difference. By combining embedded UCOSIII operating system and em Win graphic library,Ubbelohde viscometer system is designed to realize input and real-time display in touch screen interface. All experimental results show that the instrument can reach the demands of the national standard,in which the repeatability is superior to 0. 35%,the measuring error is less than 0. 1%,and the instrument has intuitive touch operation,the interface is friendly.
Aiming at the disadvantages of traditional Ubbelohde viscometer has poor data interoperability and limited automation,an adaptive liquid level determination Ubbelohde viscometer instrument is designed. By analyzing the viscosity measurement principle of Ubbelohde viscometer,a new method for automatic suction fluid level detection with K-L Divergence is developed,which is based on the feature of the liquid level. Setting there is a mark point when the liquid level is reached at timing point line. First,the liquid level detection signal window is acquired by K-L divergence method,the mark point is automatically determined by Grubbs criterion,then the start point and stop point are obtained and the flow velocity is estimated based on timing difference. By combining embedded UCOSIII operating system and em Win graphic library,Ubbelohde viscometer system is designed to realize input and real-time display in touch screen interface. All experimental results show that the instrument can reach the demands of the national standard,in which the repeatability is superior to 0. 35%,the measuring error is less than 0. 1%,and the instrument has intuitive touch operation,the interface is friendly.
引文
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[16]何康华,雷阳阳.基于u COS-III的教育机器人系统设计[J].电子测量技术,2016,39(10):114-118.HE K H,LEI Y Y.Design of educational robots system based onμCOS-III[J].Electronic Measurement Technology,2016,39(10):114-118.
[2]赵芸,蒋璐璐,张瑜,等.应用光谱技术快速测定发动机润滑油的粘度值[J].光谱学与光谱分析,2010,30(9):2496-2499.ZHAO Y,JIANG L L,ZHANG Y,etal.Determination of dynamic viscosity of automobile lubricant using visible and near infrared spectroscopy[J].Spectroscopy and Spectral Analysis,2010,30(9):2496-2499.
[3]RUST P,LEIBACHER I,DUAL J.Temperature controlled viscosity and density measurements on a microchip with high resolution and low cost[J].Procedia Engineering,2011,25(35):587-590.
[4]迟海,滕召胜,林海军,等.基于Lab VIEW的智能粘度仪设计[J].电子测量与仪器学报,2009,23(5):97-102.CHI H,TENG ZH SH,LIN H J,etal.Design of intelligent viscometer based on Lab VIEW[J].Journal of Electronic Measurement and Instrument,2009,23(5):97-102.
[5]杨圣洁,滕召胜,林海军,等.基于重力式毛细管的智能粘度仪设计[J].计量学报,2009,30(2):130-133.YANG SH J,TENG ZH SH,LIN H J,etal.Design of intellectual viscometer based on gravity-capillary[J].Acta Metrologic Sinica,2009,30(2):130-133.
[6]林海军,滕召胜,杨圣洁,等.毛细管粘度计自适应液位检测方法研究[J].仪器仪表学报,2009,30(3):625-630.LIN H J,TENG ZH SH,YANG SH J,etal.Adaptive liquid-level detection method for capillary-gravity viscometer[J].Chinese Journal of Scientific Instrument,2009,30(3):625-630.
[7]黄战华,谌刚.基于嵌入式Linux的粘度计设计[J].传感技术学报,2015,28(1):148-152.HUANG ZH H,ZHAN G.Design of viscometer based on embedded Linux[J].Chinese Journal of Sensors and Actuators,2015,28(1):148-152.
[8]陈惠钊.粘度测量和应用[J].中国计量,1998(3):45-46.CHEN H ZH.Viscosity measurement and applications[J].China Metrology,1998(3):45-46.
[9]孙洁娣,肖启阳,温江涛,等.改进LMD及高阶模糊度函数的管道泄漏定位[J].仪器仪表学报,2015,36(10):2215-2223.SUN J D,XIAO Q Y,WEN J T,etal.Pipeline leakage localization based on ELMD and high-order ambiguity function[J].Chinese Journal of Scientific Instrument,2015,36(10):2215-2223.
[10]姜晓亮,李巍,吕项羽,等.基于非参数核密度估计法的光储系统容量优化配置[J].高电压技术,2015,41(7):2225-2230.JIANG X L,LI W,LV X Y,etal.Optimization configuration of photovoltaic-storage system capacity based on non-parametric Kernel density estimation[J].High Voltage Engineering,2015,41(7):2225-2230.
[11]茹杨.核函数的核密度估计算法[D].哈尔滨:哈尔滨理工大学,2016.RU Y.Algorithm of kernel density estimation of kernel function[D].Harbin:Harbin University of Science and Technology,2016.
[12]韩中合,朱霄殉,李文华.基于K-L散度的EMD虚假分量识别方法研究[J].中国电机工程学报,2012,32(11):112-117.HAN ZH H,ZHU X X,LI W H.A false component identification method of EMD based on kullback-leibler divergence[J].Proceedings of the CSEE,2011,32(11):112-117.
[13]刘志平.检测仪表中粗大误差的剔除分析[J].电子测量技术,2009,32(11):55-57,84.LIU ZH P.Treatment analysis of rough error about measurement instrument[J].Electronic measurement technology,2009,32(11):55-57,84.
[14]中华人民共和国国家标准:粘度测试方法(GB10247-88)[S].197-199,210-211.Chinese national standards:Methods for measurement and test of viscosity(GB10247-88)[S].197-199,201-211.
[15]郑力,蔡启仲,陆伟男,等.基于em Win图形库的四旋翼飞行器监控系统设计[J].计算机测量与控制,2015,23(6):1986-1989.ZHENG L,CAI Q ZH,LU W N.A quadrotor monitoring system design based on em Win graphics library[J].Computer Measurement&Control,2015,23(6):1986-1989.
[16]何康华,雷阳阳.基于u COS-III的教育机器人系统设计[J].电子测量技术,2016,39(10):114-118.HE K H,LEI Y Y.Design of educational robots system based onμCOS-III[J].Electronic Measurement Technology,2016,39(10):114-118.