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针对DC-DC电路软故障诊断中特征提取困难和分类准确率低的问题,提出了一种基于多策略改进哈里斯优化算法-反向传播MHHO-BP)神经网络的故障诊断方法。该方法通过VMD对故障信号进行处理,提取其时域和频域特征作为故障向量,采用MHHO算法优化BP神经网络的权值和阈值,建立DC-DC电路的VMD-MHHO-BP软故障诊断模型。实验结果表明,对于DC-DC电路软故障,该方法相较于鲸鱼优化算法(WOA)和蝴蝶优化算法(BOA)优化BP神经网络,其诊断效果好,准确率高。 相似文献
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Because of the former gas chemistry examination method defects, tunable diode laser absorption spectrum technology (TDLAS) was used. It used an isolated absorption spectrum of the gas molecule to measure the gas absorption spectrum in order to distinguish the gas conveniently. The second harmonic (20 was measured in this system. Due to the fact which the harmonious signal is proportional to the concentration of the absorption gas, the gas concentration may be obtained through examining harmonious signal. The theoretical analysis and the experimental result indicate that under the same level of pressure, survey with the signal-to-noise ratio(SNR) of 2fsignal increases the accuracy by one order of magnitude and may reach 10 ^-3 and the sensitivity may reach the 10^-6 level compared to that of direct absorption. 5% methane density and a 30 cm absorption cell were used in the experiment. It has several advantages including high sensitivity, best resolution, and faster response and so on. The gas concentration monitoring of coal mine may be accomplished. 相似文献
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介绍了单片机的软件开发工具C51的延时程序的设计特点及不同方法,并结合自己的体会和经验用实例加以说明。 相似文献
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