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中文摘要：
针对某型高射机枪自动机振动信号低信噪比、干扰多的特点，提出利用S．L．Peng的局部窄带分解理论对信号进行分解和重构，并用支持向量机对故障模式进行识别。通过对自动机故障机理分析，找到易发生故障的位置，并设置3种故障后进行振动信号采集。将信号通过基于局部窄带信号的分解和重构后通过广义维数计算获得各种工况的盒维数、信息维数、关联维数、广义分形维数谱均值，将其供给支持向量机进行故障分类。所得诊断结果准确率达93．75％，具有一定的参考及实用价值。
英文摘要：
As the vibration signals of a certain type of antiaircraft gun automatons are featured by low signal-to-noise ratio（SNR） and multi-disturbances, a S.L.Peng-based local narrow-band decomposition method has been proposed to decompose and reconstruct the signals. Particularly, a support vector machine （SVM） has been used to identify the failure mode. First, the failure mechanism of the automaton was analyzed to find the location prone to failures and the vibration signals were collected after three kinds of failures were set. Second, the signals were decomposed and reconstructed by means of local narrow-band signal decomposition. Third, the box dimension, information dimension, correlation dimension, and the mean average of generalized fractal dimension spectrum were obtained and put into the SVM to classify the failure. The accuracy rate of the diagnosis is as high as 93.75%, which proves that this method has some reference and practical value.
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