Robust Fault Detection of Markovian Jump Systems

This paper deals with the problem of observer-based robust fault detection for both continuous- and discrete-time linear Markovian jump systems with an unknown input. By using a fault detection filter as residual generator and a proposed performance index as objective function, the robust fault detection filter design is formulated as an optimization problem. A sufficient condition to solve this problem is established in terms of the feasibility of certain matrix inequalities, which can be solved via iterative linear matrix inequality (LMI) algorithms. The residual evaluation problem is also considered. A numerical example is given to illustrate the effectiveness of the proposed techniques.     

Design of paramet ric fault detection systems: An H- infinity optimization app roach

Problems related to the design of observer- based parametric fault detection (PFD) systems are studied. The core of our study is to first describe the faults occurring in system actuators , sensors and components in the form of additive parameter deviations ,then to transform the PFD problems into a similar additive fault setup , based on which an optimal observer- based optimization fault detection approach is proposed. A constructive solution optimal in the sense of minimizing a certain performance index is developed. The main results consist of defining parametric fault detectability , formulating a PFD optimization problem and its solution. A numerical example to demonstrate the effectiveness of the proposed approach is provided.     

基于粗集理论的归一化方法

针对神经网络分类器在不同类样本间距离较近时训练速度较慢的缺点,提出了基于粗集理论的归一化方法。利用粗集理论对样本进行归一化处理后,用处理后的样本对神经网络进行训练。并以配电网故障选线为例,对该方法进行了分析。仿真实验结果表明,样本处理后的神经网络训练时间明显缩短。     

东汽EQ153柴油车油底壳应变分析与选材预测

用ＳＰＣＥＮ和０８Ａｌ两种薄板材料坟东汽ＥＱ１５３柴油车油度壳，用应自动测试系统（ＡＳＡＭＥ）对成形后的应变进行分析。作出成形极奶图，确定了危险部位；评价了两种钢板的成形效果，对优化选材进行预测，指出了应变硬化指数ｎ为０．２１的钢板是冲压该油底壳的最佳网板。     

A fault detection scheme for linear discrete-time systems with an integrated online performance evaluation

This paper is concerned with the design of the fault detection systems, into which a residual generation, evaluation and threshold are integrated, for linear discrete time-varying processes over a finite horizon. In the proposed design scheme, the residual generation is realised in the context of H_∞ fault estimation with a prescribed attenuation level. This attenuation level is minimised by using the Krein-space linear estimation theory and, subsequently, an H_∞ fault estimator with the minimum attenuation level is designed in terms of the solution to a set of Riccati-like recursions. For the residual evaluation and decision making purpose, the false alarm rate and fault detection rate indicators are introduced in the norm-based framework, which is integrated into the decision making procedure. For the online computations of the false alarm rate and fault detection rate indicators, further estimates delivered by the H_∞ fault estimator are applied without additional (online) computations. By means of checking the change in the false alarm rate and fault detection rate indicators, a decision is then made. In this way, the fault detection performance can be significantly improved. Finally, one application example is exploited to demonstrate the application of the proposed integrated fault detection and performance evaluation schemes.     

非线性离散不确定系统的鲁棒H_∞状态反馈控制

研究具有不确定非线性离散系统的鲁棒性能准则问题 .基于二人零和动态对策理论 ,给出并证明了系统鲁棒稳定以及扰动衰减问题解存在的充分条件 ,通过求解离散时间Hamilton jacobi Isaacs方程给出了其鲁棒H∞ 状态反馈控制解 .     

奇异Markov跳跃系统的鲁棒故障检测

研究受L2有界未知输入影响的一类奇异Markov跳跃系统的鲁棒故障检测问题。采用基于观测器的故障检测滤波器（FDF）作为残差产生器,将故障检测滤波器的设计归结为随机意义下的H∞滤波问题。推导并证明了问题可解的充分条件,并通过求解线性矩阵不等式得到了故障检测滤波器参数矩阵的解。算例验证了所给算法的有效性。     

An Observer and Post Filter Based Scheme for Fault Estimation of Nonlinear Systems

International Journal of Control, Automation and Systems - The problem of actuator fault estimation for a kind of nonlinear discrete time varying (NDTV) systems is investigated. Norm bounded...     

分布式在线指纹识别系统及其在养老金发放中的应用

指纹识别是技术较为成熟且应用广泛的生物识别技术分支。但是,随着指纹库容量的不断加大,对于1:N的指纹识别模式,现有的指纹识别算法很难满足指纹识别应用的性能指标。为了解决这个问题,文章提出了一种分布式的在线指纹识别系统,介绍了指纹库分解的原则、方法和解决方案,并成功地应用于某地区的养老金发放。实际应用表明,该系统能够大大提高指纹识别的精度和速度。     

点焊试件疲劳裂纹的监测和探讨

本文采用电阻应变法,监测了点焊试件的疲劳裂纹萌生、扩展、破坏全过程。试验表明此方法对监测焊点的内裂纹是行之有效的。