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Multiple fault analog circuit testing by sensitivity analysis 总被引:1,自引:0,他引:1
Analog circuit testing is considered to be a very difficult task. This difficulty is mainly due to the lack of fault models and accessibility to internal nodes. To overcome this problem, an approach is presented for analog circuit modeling and testing. The circuit modeling is based on first-order sensitivity computation. The testability of the circuit is analyzed by the multiple-fault model and by functional testing. Component deviations are deduced by measuring a number of output parameters, and through sensitivity analysis and tolerance computation. Using this approach, adequate tests are identified for testing catastrophic and soft faults. Some experimental results are presented for simple models as well as multiple-fault models. 相似文献
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Analog Integrated Circuits and Signal Processing - This paper introduces a node elimination method for analog circuit analysis. It is useful for manually deriving the transfer functions of small... 相似文献
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在运用小波神经网络进行混合电路故障诊断的过程中,测试参数的选取至关重要。研究了一种基于电流测试的故障诊断。该方法即通过PSPICE模拟电路的静态及动态电流信息,再通过小渡神经网络的结合,证明了该方法在混合电路故障诊断中的可行性,为提高混合电路的故障诊断率提供了一种新的方法。 相似文献
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A method is proposed to obtain a minimal set of test nodes of an analog circuit for isolating all faulty conditions in the fault dictionary approach. Relevant theorem along with the proof is also given. Proposed method is extremely fast. This method is illustrated with an active filter circuit example. 相似文献
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This paper proposes a new single or multiple soft analog circuit fault diagnosis approach based on the minimum fault number rule. It is based on the consideration that the fact that the probability of a single soft fault is much greater than that of a multiple fault if the related fault modes are independent. In this way, a new diagnostic strategy based on the circuit sensitivity analysis is proposed. The proposed strategy is an optimization-based one, whose objective is to find the minimum value of unaccepted parameter deviations which satisfy all those constraints, and the constraints equations are actually the voltage increment equations in all test nodes and the changing range of each element. The diagnosis process can fulfill the requirement of fault detection and fault isolation. It enables a fast or a real-time diagnosis in practical engineering. A DC circuit example and an AC circuit example are presented to demonstrate the effectiveness of the proposed approach. 相似文献
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文中提出了一种基于小波预处理的模拟电路故障诊断方法。由于小波分析具有数据压缩和特征提取的特性,我们利用小波变换对电路脉冲信号进行多尺度分解,提取特征向量输入神经网络进行训练。实验表明,该办法可以有效地减少神经网络的训练时间,提高模拟电路故障诊断的准确率。 相似文献
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Shokrolahi Seyed Moslem Karimiziarani Mohammadsepehr 《Analog Integrated Circuits and Signal Processing》2021,107(3):597-604
Analog Integrated Circuits and Signal Processing - Automatic fault diagnosis in analog electronic circuits is one of the interesting and important cases for researchers of this field that has... 相似文献
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在检测和诊断模拟电路的故障中,为了解决传统的BP神经网络初始权值和阈值是随机选取的,容易陷入局部最小值,出现不收敛或收敛速度慢的缺点,文中提出了采用粒子群算法来优化传统BP网络的方法。首先利用粒子群算法优化BP神经网络的初始权值和阈值,然后再由改进的BP算法进行训练仿真。通过和在单一改进BP算法下训练的诊断仿真结果进行对比,可以发现通过粒子群算法优化后的神经网络改善了网络不收敛的缺陷,在训练速度以及诊断正确率上都有所提高。 相似文献
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由于模拟电路的非线性、易受外界干扰等因素,模拟电路的故障在设备总故障中占很大的比例。因此,对模拟电路的故障诊断技术进行深入研究具有很重要的意义。文中针对雷达电路的故障进行快速有效的特征提取,采用神经网络中ELM网络建立诊断系统结构,并通过对具体电路的仿真,输出ELM网络的诊断结果。实际应用表明,该系统具有操作简便、诊断精度高的特点,达到了设计要求。 相似文献
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介绍了应用小波变换法与BP神经网络相结合实现模拟电路故障诊断的方法。应用小波变换法作为故障信号的预处理器,提取故障特征量,减小了BP神经网络的规模。该方法提高了神经网络收敛的速度以及故障类别识别的准确度,具有一定的应用价值。 相似文献
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