摘要
磁流体动力学(magneto-hydro-dynamic,简称MHD)传感器是测量航天器平台宽频微角颤振的关键器件之一。鉴于MHD传感器的误差与噪声特性会影响星载惯性导航系统的精度与分辨率,对所设计的MHD传感器进行误差分析与试验验证。采用样机数据分析与组件物理建模相结合的方法,分析与验证MHD传感器灵敏度特性与误差模型。结果表明:传感器的误差主要受到重力方向与温度条件的影响,并且该项误差对无温控MHD传感器的误差起决定作用;当温度变化较小时,变压器磁芯磁导率的工艺误差占总误差的一半;差分放大器的噪声对传感器噪声具有显著影响。
This paper presents the error analysis and experimental identification of a magneto-hydro-dynamic(MHD)sensor system for space application.MHD sensor is an alternative to measure the angular vibration ofμrad in a broad frequency band.Because the quality of a MHD sensor decides the precision and resolution of spaceborne inertial navigation system,the error and noise shall be the important standards to improve its performance.In combination with hypothetical model of data analysis,sensitivity performance and error model of the designed MHD sensor is analyzed and verified by numerical modeling of sensor assembly.The sensor′s error analysis motivates the importance of clarifying the gravity orientation and temperature condition,because the parameters contribute to the largest part of bias error.The inconformity of dynamic permeability in the transformer occupies the half of the total error when the temperature is constraint.The noise of the differential amplifier should be emphasized.The result will provide a reference to improve the performance of MHD sensor.
作者
周海佳
李得天
ZHOU Haijia;LI Detian(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics Lanzhou,730000,China)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2020年第6期1135-1140,1233,共7页
Journal of Vibration,Measurement & Diagnosis
关键词
磁流体动力学传感器
误差分析
灵敏度
模型验证
magneto-hydro-dynamic(MHD)sensor
error analysis
sensitivity
model identification
