一种神经网络控制器的容错设计与可靠性评估方法

本文以应用于电力控制系统中的人工神经网络快速汽门非线性适应控制器为例,详细论述了一种神经网络控制器的容错设计与可靠性评估方法,文中首先提出网络可靠性研究的重要性,以及本文所提出和容错设计与可靠性评估方法的通用性,然后详细介绍了一种神经网络快速汽门非线性适应控制器的设计结构和容错设计原理,最后根据设计的结果,得出了可靠性评估公式及其推广。     

FPGA电路动态老化技术研究

近年来,随着FPGA电路在军工和航天领域的广泛应用,用户对FPGA电路的可靠性要求也越来越高。在集成电路的可靠性评估试验中,动态老化试验是最重要的试验之一,FPGA动态老化技术的实现可以提高FPGA电路的可靠性。文章通过研究FPGA电路内部结构和功能模块,讨论FPGA电路加载配置过程的原理和流程,通过对动态老化和静态老化的对比试验和结果分析,研究出FPGA电路动态老化试验方法,并在工程实践中得到了成功实现和应用。     

A new hierarchical belief-rule-based method for reliability evaluation of wireless sensor network

With the wide applications of wireless sensor network (WSN), its reliability evaluation has been attracted more attention. The reliability of a WSN is affected mainly by internal and external factors, which include internal faults and external attacks. In this paper, a reliability evaluation method based on a hierarchical belief rule base (BRB) method is proposed for the reliability evaluation of the WSN. First, the factors affecting the reliability of a WSN are analysed, and the reliability evaluation process that considers the WSN fault evaluation and WSN security evaluation is described. Second, the reliability evaluation model is constructed based on the hierarchical BRB model. The qualitative knowledge is used by the BRB model to build initial belief rules, and the quantitative data are used to optimize the initial parameters of the BRB model, which can utilize various types of uncertainty information effectively. Therefore, the proposed method can be applied to the WSN reliability evaluation, which is a complex and uncertain problem. Finally, a simulation case study and an actual case study of wellhead blowout monitoring are conducted to verify the effectiveness of the proposed method. The reliability results of actual WSN are obtained by the standard testing method, where the loss and accuracy rates of the collected data are treated as the observation factors for obtaining the actual reliability values. The estimated results of hierarchical BRB model are very close to the actual reliability values, which shows that the proposed method can be used for evaluating the reliability of the actual WSN accurately.     

雷达固态发射机可靠性评估和失效判别的定量方法

本文导出了固态发射机可靠性评估模型和验证方法，以适应固态发射机可靠性设计和实验的需求。     

电子对抗系统可靠性的参照式模糊综合评估

使用模糊综合评判与贴近度的理论对电子对抗系统的可靠性进行了评估,并将这种评估方法与传统模糊综合评估方法进行了对比分析,并参照已有的评估体系建立了一套电子对抗系统的可靠性的评估指标．以作为使用本评估算法的评估基础。     

电子对抗系统可靠性的参照式模糊综合评估

使用模糊综合评判与贴近度的理论对电子对抗系统的可靠性进行了评估,并将这种评估方法与传统模糊综合评估方法进行了对比分析,并参照已有的评估体系建立了一套电子对抗系统的可靠性的评估指标,以作为使用本评估算法的评估基础。     

航天用DC/DC电源模块结构分析研究

结构分析作为一种可靠性评估方法,它通过分析元器件的设计和结构工艺来确定元器件是否存在潜在的失效机制,对于高可靠应用领域元器件的质量保证起着重要的作用。DC/DC电源模块是航天器广泛使用的重要元器件,它的长期可靠性和稳定性直接关系着航天器的在轨安全。对航天用DC/DC电源模块的结构分析方法进行了研究,并给出了它的关注点和试验方法及其重要的判据,为航天用DC/DC电源模块的结构分析提供重要的指导。     

Using error tolerance of target application for efficient reliability improvement of digital circuits

With the technology scaling, nanoscale devices are becoming more and more sensitive to external influences. Reliability analysis is expected to play a major role for the design process of nanoscale systems. In fact, understanding the relations between circuit structure and its reliability allows the designer to implement tradeoffs that can improve the resulting design. In this work, we propose and verify a method for reliability evaluation, named effective reliability, that can tolerate errors based on a pertinent quality metric. In order to demonstrate the impact of the proposed approach, we designed two operators using reliability as a constraint: an 8-bit ripple carry adder and a 4-bit multiplier. Comparing the resulting designs using the traditional reliability evaluation method and the proposed one, we can observe significant savings in circuit area.     

Overall reliability evaluation for large computer communication networks: An MHC approach

An important parameter in the topological design of computer communication networks is that of overall reliability, rather than terminal-pair reliability, as one is interested in not allowing service disruption between any pair of nodes. Exact techniques for overall reliability evaluation based on the spanning trees idea fail for networks even of reasonable size because of the enormous amount of computer time and storage required. In this paper, we present a very simple and fast method based on an m-level hierarchical clustering (MHC) for network overall reliability evaluation which gives results as good as exact techniques for realistic values of link reliability (e.g. 0.9 or more). Adaptability of a practical clustering method (i.e. complete linkage, CL) to obtain near optimal clusters for overall reliability evaluation by incorporating suggested modifications is proposed.     

小子样方法在制导弹药储存可靠性评估中的应用

由于价格高、数量少,导致对制导弹药储存质量进行试验和评估时,不能进行大样本量的实弹射击。首先分析了评估制导弹药储存可靠性的可用数据,确定融合静态电参数检测数据和实弹射击数据,采用混合Bayes方法进行综合的评估;并针对某典型制导弹药,进行了具体的评估。为制导弹药储存可靠性评估提供了一种新方法,具有应用价值。     

基于MATLAB App Designer的牵引电机滚动轴承可靠性评估系统设计

牵引电机滚动轴承在运行过程中由于存在载荷不均匀和运行环境恶劣的问题,需要评估地铁车辆牵引电机滚动轴承的可靠性.文中基于MATLAB App Designer对牵引电机滚动轴承可靠性评估系统进行了设计开发.通过提取振动信号的时域、频域特征指标,利用主成分分析法进行特征融合.将融合后的特征指标作为威布尔比例故障率模型的响应...     

模糊综合评判在雷达性能评估中的应用

雷达工作状态的好坏通过雷达的性能参数反映出来，利用模糊综合评判法对测得参数的相关数据进行处理，然后对被测雷达装备性能做出综合评估，会大大提高评判结果的可信度。文中结合雷达性能测试与评估系统的设计，介绍了模糊综合评判法的原理及其数学模型的建立，阐述了该模型在雷达性能测试与评估系统中的应用，并给出了该测试评估系统的硬件组成以及实现测试评估的软件表述和模块构成。     

可靠性仿真试验及其在雷达研制中的应用

可靠性仿真试验是基于故障物理原理和计算机技术,利用计算机仿真分析软件,对雷达等电子设备进行数字模型可靠性分析和计算的过程。通过软件在电子样机上施加产品所经历的载荷历程,分解到产品的基本模块上,进行应力分析和应力损伤分析,从而找出产品的设计薄弱环节;通过仿真预计产品的失效时间分布并分析,指导和辅助可靠性设计优化;通过可靠性仿真量化评估,比较设计方案,为可靠性综合评价提供支持。研究表明：可靠性仿真试验缩短了雷达研制周期,提高了雷达可靠性水平。     

Reliability evaluation of multistage interconnection networks with multi-state elements

This paper presents a graph-theoretic method for the reliability evaluation of multistage interconnection networks with multistate elements. For the purpose of analysis, the generalized cube (GC), a unique-path MIN and an extra-stage cube (ESC), a fault-tolerant variation of GC, are considered. An algorithm is presented to evaluate three reliability measures, i.e. terminal reliability (TR), broadcast reliability (BR) and network reliability (NR) of MINs for different reliability values of links and switches. The proposed method is found to be simple and computationally efficient compared to the existing techniques, and therefore can be applied for reliability evaluation of other large interconnection networks used in parallel computing systems.     

外挂管理系统安全可靠性评估

为了评估外挂管理系统（SMS）工作的安全可靠性，提出了建立SMS的测试环境和对SMS安全可靠性进行测试的方法，并运用NHPP模型对测试数据进行拟合，用工作可靠度和残留故障数对SMS的安全可靠性进行了评估。     

Reliability Analysis of Large Circuits Using Scalable Techniques and Tools

The rapid development of CMOS and non-CMOS nanotechnologies has opened up new possibilities and introduced new challenges for circuit design. One of the main challenges is in designing reliable circuits from defective nanoscale devices. Hence, there is a need to develop methodologies to accurately evaluate circuit reliability. In recent years, a number of reliability evaluation methodologies based on probabilistic model checking, probabilistic transfer matrices, probabilistic gate models, etc., have been proposed. Scalability has been a concern in the applicability of these methodologies to the reliability analysis of large circuits. In this paper, we develop a general, scalable technique for these reliability evaluation methodologies. Specifically, an algorithm is developed for the model checking-based methodology and implemented in a tool called Scalable, Extensible Tool for Reliability Analysis (SETRA). SETRA integrates the scalable model checking-based algorithm into the conventional computer-aided design circuit design flow. The paper also discusses ways to modify the scalable algorithm for the other reliability estimation methodologies and plug them into SETRA's extensible framework. Our preliminary experiments show how SETRA can be used effectively to evaluate and compare the robustness of different circuit designs.     

热仿真设计在陶瓷封装中的应用研究

热仿真设计可以对封装产品进行散热性能评估,对缩短产品设计周期、提高产品热可靠性有着重要的意义。采用有限元方法对陶瓷封装器件进行了结壳热阻(θJC)的仿真分析。仿真结果显示,当采用两种不同方法进行边界条件处理时,所得仿真结果产生一定的差异。分析认为,陶瓷基板散热条件的变化会对最终的热阻值造成一定的影响。热电测试法被用来进行实物封装的热阻测量,测试时采用的导热胶会对最终的测试结果产生影响。仿真与测试结果对比显示,仿真方法可以获得较精确的结果。     

微电子生产工艺可靠性评价与控制

简要介绍了可靠性评估(REM)测试结构设计,并介绍了REM试验中与时问有关的栅氧化层击穿(TDDB)、热载流子注入(HCI)效应和电迁移(EM)效应的评价试验方法及实例。REM技术与工艺过程控制(PCM)、统计工艺控制(SPC)技术结合起来就可以实现对工艺的可靠性评价与控制,某集成电路生产公司将它应用于金属化工艺中．确定了工艺输入变量与电迁移可靠性的相关性,优化了金属化工艺试验条件,提高了金属化系统的抗电迁移能力。     

输电线路在线监测系统可靠性提升方法研究

根据输电线路在线监测系统的特点和实际运行情况,对其常见故障进行了分类与分析,并建立了可靠性模型。在此基础上,提出了针对电路设计、机械设计、电源设计、标准化设计、实验验证等各个环节的可靠性提升方法。最后提出了针对输电线路在线监测系统的可靠性预计方法,并对所优化的系统进行了可靠性预计,得到了系统平均无故障工作时间（MTBF）的预计值,在一定程度上验证了可靠性提升方法的应用效果。