Fault DSm T Fusion Method of Core Barrel Based on Wavelet Energy Analysis
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摘要: 针对反应堆堆芯吊篮破裂和吊篮紧固件部分脱落故障信号难以获取问题,提出一种小波包能量特征提取和不确定理论DSm T故障决策的融合方法。测试3种吊篮故障工况的振动信号,利用小波包变换对信号进行分解-重构,提取频段能量构建子带能量特征向量,归一化处理后赋值给DSm T信度函数,使用DSm T信息融合方法在决策层对故障模式进行识别及验证。实验结果表明该方法能够有效辨识吊篮故障模式,具有较高的准确性及泛化能力。Abstract: Being aimed at the problems that it is difficult to recognize effectively the faults of core barrel rupture and fall off of core barrel fasteners parts, a method of the wavelet packet energy analysis and DSm T is proposed. By using the wavelet decomposition and reconstruction method, the fault signal of core barrel is decomposed to the basis function family formed from wavelet expanding and contracting, then sub-band energy distributed in different bands are obtained, and used as BPA evaluation signal of core barrel DSm T. By the simulation and analysis, the effectiveness of this method is verified.
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Key words:
- DSm T /
- Wavelet packet energy analysis /
- Core barrel /
- Information fusion
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