故障诊断论文基于聚类分析的卫星姿态控制系统故障诊断方法研究(2)

故障诊断论文：基于聚类分析的卫星姿态控制系统故障诊断方法研究【中文摘要】应用于卫星系统的故障诊断技术是确保卫星系统正常工作必不可少的一项关键技术,它不仅让卫星系统具有智能化修复功能,而且其诊断经验可以优化卫星系统观测点的分布。随着卫星系统越来越复杂与智能化,卫星故障诊断的能力在未来卫星技术发展中变得突出重要,并不断向更高水平发展。现代卫星系统的复杂化,使得基于模的故障诊断方法——建模难度大、灵活性差,导致基于模型的方法很难取得较好的故障诊断结果。由于基于聚类分析的故障诊断方法利用历史数据进行建模,不需要实际的物理结构模型,它能够克服基于模型的诊断方法的缺点。本论文采用基于聚类分析的故障诊断方法,开发和利用卫星监控系统所采集的历史数据。论文的研究内容主要包括以下几个方面:首先,研究基于聚类分析的数据分布特征提取方法的特点,学习聚类分析的两种算法,利用聚类算法分析拟合数据与异常数据,设计拟合数据与异常数据的差值模型,初步建立基于聚类分析的故障诊断模型。其次,对标准的飞机控制系统模型进行数值仿真,获取该模型的健康数据和故障数据,采用基于聚类分析的诊断方法进行故障诊断,依据诊断结果来完善该故障诊断模型的建模与诊断推理步骤。再次,结合卫星姿态控制系统的结构,对主要部件的数学模型做了详细分析,并研究飞轮摩擦力矩对姿态角控制效果的影响。建立卫星姿态控制系统的外在干扰力与力矩的数学模型,针对系统的执行部件与测量部件,设置了不同的故障模式并建立相应的数学模

型。最后,根据卫星姿态控制系统部件的几种典型的故障模式,建立相应的simulink仿真模型,设置卫星姿态控制系统仿真参数与设定该

系统的状态观测点,对这几种仿真模型进行数值仿真模拟并采集系统

的健康数据与故障数据。利用聚类分析的方法对该姿态控制系统进行故障诊断。

【英文摘要】The Fault Diagnosis Technique (FDT) applied to satellite systems is a special technique adopted to ensure the proper functions of the systems. It can not only realize the intelligent repaire, but the diagnosis experiences can also optimize the observation points of the satellite systems. With the developing tendency of more complex and intelligent of satellite systems, FDT plays a more important role and is pushed to reach a higher level.Because of the complexity of the modern satellite systems, the model-based FDT, which has a complicated modeling process and poor flexibility, can not always obtain a good result of fault diagnosis; while the

cluster-analysis-based on history process data FDT (CBHD-FDT), which makes use of historical data and does not need the physical structure of systems, can overcome those short comings. Therefore, the research in this paper is using the CBHD-FDT, and exploring and applying the historical data gathered by the satellite monitering system. The main content of this research

is as follows:Firstly, the characteristics of the extraction method into the data distrubuted features of CBHD-FDT are taken into deep research. Then two kinds cluster analysis algorithms are studied, using which the expected fitting data and the actual abnormal data are analyzed, a variance model is built, and the initial CBHD-FDT model is established.Then, the numerical simulation is performed on a standard aircraft control system, from which both the healthy and faulty data are obtained. Further, CBHD-FDT is applied to diagnose this system, based on the results of which, the modeling process and diagnosis reasoning steps can be improved.What’s more, combined with the actural structure of the satellite attitude controling system, the mathematical models of the main components are analyzed in details, with the influence of the flywheel friction torque on the attitude angle controling effects. The analytical models of the external disturbance forces and torques loading on the satellite attitude controling system are established. In addition, in view of specific operating and measuring components, the corresponding mathematical models are set under different faulure modes.Finally, based on several typical failure modes of a satellite attitude controling system, after the parameters of