小管径高精度超声波流量计设计  

Design of High-Accuracy Ultrasonic Flowmeter

作　　者：丁凤林[1] 李宗良[1] 魏延明[1] 宗光华[2] 

机构地区：[1]北京控制工程研究所,北京100190 [2]北京航空航天大学机器人研究所,北京100191

出　　处：《空间控制技术与应用》2011年第1期28-32,49,共6页Aerospace Control and Application

摘　　要：航天器推进剂在轨剩余量测量一直是航天器在轨管理所面临的一个难题.提出采用超声波流量计测量推进剂在轨剩余量的方法,并给出了超声波流量计的设计方案.设计的新型超声波流量计结构,通过改变超声换能器的安装方式,从而延长了超声波传播路径,减少了传播过程中超声波的衰减.通过以单片机和FPGA为主控制器、以高精度时间测量芯片作为数据采集模块的流量计软硬件系统实现了超声波流量计对液体流量的高精度测量.通过恒速测试、交变流速测试和总量测试表明,该系统测量精度达到了0.5%,可满足目前航天器推进系统推进剂剩余量的在轨测量要求.In order to solve the problems of short propagation path and difficulties in measuring the transit-time when a traditional ＂Z＂ ultrasonic flowmeter is used for small caliber measurement,a new ultrasonic flowmeter is designed.Propagation path is extended and the attenuation of ultrasonic intensity is reduced by altering the transducer＇s installation.The high-precision flowmeter control system is designed by using FPGA as the main-controller and high accuracy timer as the time interval measurement controller.The experiments of constant speed test,alternate flow rate test and gross flow rate test to ultrasonic flowmeter are implemented.The measure accuracy of ultrasonic flowmeter is about 0.5%.

关 键 词：超声波流量计 流量测量 时间差法 

分 类 号：V448[航空宇航科学与技术—飞行器设计]