基于扩展多信号模型的故障样本可拓评价方法

合理确定评价指标及分配指标权重对故障样本评价至关重要,文章在综合考虑测试性验证试验目的和考核内容的基础上,提出一种基于扩展多信号模型的故障样本可拓评价方法;方法基于扩展多信号流图构建故障样本评价的指标,结合可拓学理论,建立基于平均故障关联度的故障样本集可拓评价模型,并对某型机载数传测试性验证试验故障样本进行评价;研究结果验证了所提方法的有效性。     

单输入单输出系统故障检测中匹配混沌激励的设计

针对单输入单输出系统故障检测定义了混沌激励与被测系统匹配的概念,建立了混沌激励与被测系统匹配的标准,提出了调整混沌激励与被测系统匹配的方法.利用改进的预测误差实现了对单输入单输出系统的故障检测.仿真结果表明,匹配混沌激励能够对被测系统故障进行有效检测,而不匹配混沌激励对被测系统进行故障检测时存在不确定性.     

The backup 2-median problem on block graphs

The backup 2-median problem is a location problem to locate two facilities at vertices with the minimum expected cost where each facility may fail with a given probability. Once a facility fails, the other one takes full responsibility for the services. Here we assume that the facilities do not fail simultaneously. In this paper, we consider the backup 2-median problem on block graphs where any two edges in one block have the same length and the lengths of edges on different blocks may be different. By constructing a tree-shaped skeleton of a block graph, we devise an O（n log n q- m）-time algorithm to solve this problem where n and m are the number of vertices and edges, respectively, in the given block graph.     

江苏东方四通科技股份有限公司

<正>新能源产业成就卓越发展.绿色电源点亮未来之路超越自我追求卓越主要产品太阳能硅单晶炉直流开关电源蓝宝石(Al_2O_3)单晶炉直流开关电源单晶炉磁场电源单晶生长炉感应加热电源多晶铸锭炉PWM交流调压电源江苏东方四通科技股份有限公司是一家致力子绿色、高效电源研发和生产的高新技术企业,曾承担国家和江苏省火炬计划项目,并获得科技创新基金,主要产品有大功率软开关电源。PWM交流调压器。     

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介绍了高压直流电源输出发生短路故障时的暂态情况,并详细分析和计算了速调管负载发生极间打火时,在三电极气体开关保护动作过程中电源向速调管注入的能量。计算和仿真结果与实验结果一致,当高压电源输出发生短路故障时,开关能在μs级关断,并且能将短路电流能控制在200A。验证了三电极气体开关保护的快速性与可靠性,具有工程应用价值。     

The decoupling of the active structural acoustic control based on the theory of radiation modes

With the theory of radiation modes,piezoceramics are used as control actuators in the active control of sound radiation.According to the characteristics of the first four radiation mode shapes,the arrangement of four group of actuators is presented.Theoretical analysis and numerical calculation demonstrate that the four group of actuators can not only reduce the sound power effectively,but also decouple the control equations.While controlling of the sound powers of the first four radiation modes,these actuators can convert the complicated control system with multiple input/output into several simple and independent systems with single input/output.     

有优先权且工作故障与贮备故障后的修理时间不相同的温贮备系统的可靠性分析

为了解决开关寿命为连续随机变量且部件工作故障的修理时间与贮备故障后的修理时间各不相同的问题,利用Markov过程理论和Laplace变换方法,研究了有优先权的两不同型部件和两不同修理工组成的温贮备可修系统.假定部件的工作寿命、贮备寿命、工作故障的修理时间和贮备故障的修理时间均服从不同的指数分布,得到了该系统的可靠度Laplace变换和系统的首次故障前平均时间的解析表达式.     

直升机载光电稳瞄系统可靠性研究与分析

 稳瞄系统可靠性对直升机载武器系统可靠性具有重要影响。通过对产品可靠性概念和军用光电系统可靠性、直升机载稳瞄系统的功能和组成单元的阐述,给出了舰载直升机光电稳瞄系统的可靠性框图和数学模型。研究了舰载直升机稳瞄系统的可靠性影响因素和系统故障模式,探讨了稳瞄系统结构、光学和电气可靠性,提出通过计算机仿真对稳瞄系统可靠性进行预计分析的方法。某舰载直升机稳瞄系统在96 h可靠性试验过程中出现故障2次,达到MTBF≤32 h的可能性指标要求。对系统可靠性提前进行预估并采取相应的设计措施,保证产品可靠性达到设计要求,提高设计质量,缩短研制周期。     

作战飞机可靠性指标确定方法研究

作战飞机的可靠性决定了其完成作战任务的能力,在飞机研制阶段提出合理的可靠性指标,对提高飞机可用性和战备完好性具有重要作用.根据作战飞机实际使用需求,提出一种基于战斗出动强度的作战飞机可靠性指标确定方法,将飞机作战需求转换成和飞机出动强度有关的可靠性定量参数.     

Analysis and modeling of resistive switching mechanism oriented to fault tolerance of resistive memory based on memristor

With the progress of the semiconductor industry, resistive memories, especially the memristor, have drawn increasing attention. The resistive memory based on memrsitor has not been commercialized mainly because of data error. Currently, there are more studies focused on fault tolerance of resistive memory. This paper studies the resistive switching mechanism which may have time-varying characteristics. Resistive switching mechanism is analyzed and its respective circuit model is established based on the memristor Spice model.