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基于虚拟仪器技术,利用LabVIEW7.1编写采集分析程序,并以Matlab Script节点形式调用在Matlab里训练成功后的BP神经网络程序,开发了柴油机供油系故障诊断系统。该系统由PCI-6221采集卡获取测取燃油压力波形,利用小波包分解提取特征信号,并组成特征向量输入训练成功的BP神经网络进行典型故障识别,诊断结果通过人机界面输出,从而实现了故障诊断的智能化。
Based on the virtual instrument technology, LabVIEW7.1 is used to compile acquisition and analysis program, and BP neural network program after successful training in Matlab is called by Matlab Script node. The fault diagnosis system of diesel oil supply system is developed. The system acquires the fuel pressure waveform by PCI-6221 acquisition card, extracts the characteristic signal by wavelet packet decomposition, and forms the eigenvector which is input into the trained BP neural network for typical fault identification. The diagnostic result is output through the man-machine interface, Intelligent troubleshooting.