基于局部方法的余度惯性组件故障诊断.PDFVIP

摇 2006 年 7 月 第32卷 第7期 北 京 航 空 航 天 大 学 学 报 Journal of Beijing University of Aeronautics and Astronautics July摇 2006 Vol. 32摇 No郾 7 摇 收稿日期: 2005鄄07鄄20 摇 基金项目: 国家自然科学基金资助项目 摇 作者简介: 熊摇 凯(1976-), 男, 北京人, 博士生, tobelove2001@ tom. com. 基于局部方法的余度惯性组件故障诊断 熊摇 凯摇 摇 张洪钺 (北京航空航天大学 自动化科学与电气工程学院, 北京 100083) 摇 摇 摘摇 摇 摇 要: 介绍了局部方法( local approach)原理及其在随机系统故障诊断中的应用问 题,讨论了用于故障诊断的样本数目对检测性能的影响,指出通过增加样本数目,可以大大增 加局部方法检测小故障的能力,并说明样本数为 1 时,广义似然比(GLR,Generalized Likelihood Ratio)方法和局部方法的判决函数相同.为了验证所提出方法的有效性,将局部方法用于沿正 十二面体对称侧面配置的冗余微机械惯性组件( IMU, Inertial Measurement Unit)故障检测,实 验结果表明文中的理论分析是符合实际情况的. 关摇 键摇 词: 容错系统; 惯性导航系统; 局部方法; 广义似然比方法 中图分类号: V 241. 6 文献标识码: A摇 摇 摇 摇 文 章 编 号: 1001鄄5965(2006)07鄄0783鄄05 Fault detection for inertial measurement unit based on local approach Xiong Kai摇 Zhang Hongyue (School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China) Abstract: The application of local approach for fault detection in stochastic dynamic systems was presen鄄 ted. It was demonstrated that the selection of samples numbers plays an important role in improving the per鄄 formance of the local approach. And it was pointed out that by enlarging the number of samples, the ability of the technique to detect small fault will be enhanced significantly. It was shown that when the sample size n = 1, decision function of the generalized likelihood ratio (GLR) method is the same as that of the local ap鄄 proach. In order to illustrate the efficiency of the proposed method, the local approach was applied to detect fault of the redundancy micromechanical inertial measurement unit (IMU) with a dodecahedron configuration, and the experiment results confirm findings of the theory analysis. Key words: fault tolerant systems; inertial navigation systems; local approach; GLR test 摇 摇 随着惯性传感器精度的提高和组合导航技术 的发展,惯性器件在飞行器导航和航天器姿态测 量方面发挥着越来越重要的作用. 自主导航技术 的发展对系统可靠性提出了更高的要求. 硬件余 度技术是提高系统可靠性的重要手段,其基本思 想是使用多个传感器执行同一任务,并采用故障 检测与隔离(FDI,Fault Detection