共查询到18条相似文献,搜索用时 93 毫秒
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提出了一种在模拟电路故障诊断中故障类模糊集的确定算法.该算法基于测前仿真法,不但同时适用于线性电路和非线性电路,而且可以确定元件模糊组以外的故障类模糊集.算法利用电路仿真故障特征数据计算故障的类间差异矩阵,从而完成故障类模糊集的确定.计算示例验证了该算法的有效性. 相似文献
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基于生物免疫系统的信息处理机理,介绍了被动免疫算法的实现过程,并将其应用到某装备电路板的故障诊断之中。该算法具有边检测边学习的动态调整功能,仿真和实验实例表明,该算法适合于电路板的故障诊断,有较高的故障诊断率。 相似文献
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随着电路系统的复杂程度不断提高,模拟电路故障率占据总故障率的大部分,因此人们更为迫切地希望提高模拟电路整体可靠性与可维护性.首先介绍模拟电路故障原因和故障诊断的要求,然后简要阐述故障诊断的方法。 相似文献
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随着电路系统集成度的不断增大,模拟电路中的故障成本占据集成电路总诊断成本的绝大部分,因此加强模拟电路故障诊断与排除的研究十分重要。首先分析模拟电话故障的类型与原因,随后详细介绍几种故障的诊断方法。 相似文献
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本文提出了一种模拟电路测试向量故障仿真方法。与传统的故障开关法相比 ,使用该方法求解模拟电路各种故障状态下的测试向量时 ,所需要的计算量大大减少 相似文献
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提出了基于支持向量机的模拟电路软故障诊断新方法.该方法提取电路的频域响应为故障特征,利用支持向量机对故障进行识别分类.支持向量机具有结构简单、泛化能力强的特点,对小样本分类具有良好的识别效果.以Sallen-Key滤波电路为诊断例,实验结果表明该方法故障诊断准确率大于99%. 相似文献
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在基于模型的诊断推理中,诊断是分两步进行的,一是与领域有关的冲突识别,二是与领域无关的候选产生。本文定义了测点元件影响集的概念,提出了由测点元件影响集与测点的二值测量结果直接求解最小故障集合的方法。该方法与现有模型诊断方法完全不同,诊断只需一步完成。 相似文献
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Das S. R. Zakizadeh J. Biswas S. Assaf M. H. Nayak A. R. Petriu E. M. Jone W. B. Sahinoglu M. 《IEEE transactions on instrumentation and measurement》2007,56(3):840-855
This paper aims to develop an approach to test analog and mixed-signal embedded-core-based system-on-chips (SOCs) with built-in hardware. In particular, oscillation-based built-in self-test (OBIST) methodology for testing analog components in mixed-signal circuits is implemented in this paper. The proposed OBIST structure is utilized for on-chip generation of oscillatory responses corresponding to the analog-circuit components. A major advantage of the OBIST method is that it does not require stimulus generators or complex response analyzers, which makes it suitable for testing analog circuits in mixed-signal SOC environments. Extensive simulation results on sample analog and mixed-signal benchmark circuits and other circuits described by netlist in HSPICE format are provided to demonstrate the feasibility, usefulness, and relevance of the proposed implementations 相似文献
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We propose a novel class strain measures for use with digital image correlation (DIC). Whereas the traditional notion of compatibility (strain as the derivative of the displacement field) is problematic when the displacement field varies substantially because of either measurement noise or material irregularity, the proposed measure remains robust, well defined and invariant under rigid body motion. Moreover, when the displacement field is smooth, the classical and proposed strain measures are approximations of each other. We demonstrate, via several numerical examples, the potential of this new strain measure for problems with steep gradients. We also show how the non‐local strain provides an intrinsic mechanism for filtering high‐frequency content from the strain profile and so has a high signal to noise ratio. This is a convenient feature considering image noise and its impact on strain calculations. 相似文献