车用发动机汽缸-活塞-活塞环磨损自诊断技术研究

提出了通过测量汽缸压缩压力来判断汽缸-活塞-活塞环磨损的自诊断技术方案,研究了测试系统及硬件结构,编制了测试软件程序并进行了计算机仿真,并对该系统提出了具体要求.     

复杂控制系统故障诊断方法分析

分模块介绍了复杂控制系统故障诊断的相关方法,重点讨论了自诊断自测试技术,并提出复杂控制系统中开展自诊断自测试技术研究的一些思路与方法。     

基于多路选择器的胚胎电子系统的设计与实现

胚胎电子系统的多细胞结构和工作机制产生于多细胞生物启发的灵感，是一种具有在线自诊断、自修复能力的细胞阵列。文章介绍了胚胎电子阵列的结构和基本原理，给出了细胞电路的设计方案，提出了一种胚胎电子阵列重构时保持电路状态的工作机制。以序列信号发生器为例，给出了基于胚胎电子阵列的应用系统设计方法，通过数字仿真验证了方案的可行性与正确性。     

线型红外感烟火灾探测器算法设计

本文以对射式编码型线型红外光束感烟火灾探测器为例,介绍了其基本工作原理及探测器采用的通信协议、自动补偿、可变窗口建立基准和差值等智能算法,并对试验获得的数据进行了分析,验证了上述算法的可行性。     

压力传感器自学习校准系统的设计

提出了用计算机提高压力传感器性能和精度的方法,设计了硬件电路及软件。在对传感器修正方法的分析基础上,提出了一种综合修正压力传感器的温度误差和非线性误差的方法,并详细介绍了放大器自调零方法和系统自学习方法     

PLC控制系统的故障诊断技术

PLC控制系统故障诊断包括外设、系统和硬软件诊断.其块堆栈、中断堆栈和局部堆栈通过系统自诊断可自动生成各部分状态,经编程器读写状态字和控制字能判断系统故障原因和部位.调用编程器的状态测试、输入/输出信号、与内存比较可实现PLC自诊断.输入开关、输出指示灯用直接检测法检测.在系统初始化程序中插入键短路检测程序可判断键的故障.首发故障使用程序中定义首发故障标志而诊断.     

光纤智能复合材料结构的研究

本文介绍了一种光纤智能复合材料结构的研究情况。在这种智能复合材料结构中,采用了偏振型光纤传感器构成了载荷自诊断系统、液芯光纤组成了损伤自诊断自修复系统。此外,在结构中还埋置了形状记忆合金丝网络,对增强结构强度、改善自修复的质量均起到了良好的作用。     

A new self-diagnosing approach based on petri nets and correlation graphs for fault management in wireless sensor networks

In most fault-detection algorithms in wireless sensor networks (WSNs), each sensor compares its data with the data of neighboring nodes. The majority of comparative methods will not work properly if more than half of the neighboring nodes of a sensor are faulty. Moreover, such comparative methods are unable to detect common mode failures (CMFs). Hence, having noticed the deficiencies of the existing comparative methods and as a reaction against such problems, we introduced a novel self-diagnosing approach to reduce the effect of neighboring node’s data in determining the status of nodes so that a sensor’s status will be determined independently of any comparisons. A sensor will be deemed to be fault-free if its components and the inner links between the components are flawless. In this paper, the behaviors of the components of a sensor are independently analyzed by means of the proposed model based on Petri nets and the links of the sensor’s components are investigated by means of the correlation graph. In addition, the authors extended and generalized the proposed method to all the nodes of a network and evaluated their operation. Simulation results showed that the modeling implemented by the HPSim tool can cover both permanent and transient faults accurately. Moreover, using the correlation graph and Pearson correlation coefficient helped us to gain confidence in the correctness of the inner links between the components of a sensor. Evaluation of the results indicated that the statistical results from the QI Macros tool were substantially similar to those from HPSim and Matlab tools. Furthermore, simulations results demonstrated that the detection accuracy and false alarm rate of the proposed method is acceptable even when the fault probability of each sensor is generally to be high. As a result, using these mechanisms leads to the development of the self-diagnosing capability in the sensors of a WSN.     

无人机飞控软件抗干扰设计

在无人机飞控系统中，抗干扰性能是系统可靠性的重要指标。结合自身实践，本文首先介绍了干扰可能对软件运行造成的影响，然后提出了若干行之有效的软件抗干扰措施。本文重点研究了无人机飞控软件的自诊断和自修复技术。飞行实践证明，所采取的这些抗干扰措施行之有效，基本达到了设计要求。