Dynamical response feature analysis based on 3⁃dimensional blade tip clearance and diagnosis method for blade crack
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摘要:
将裂纹叶片三维动力响应分析与参数识别方法相结合,分析不同裂纹叶片状态下三维叶尖间隙(3⁃dimensional blade tip clearance,3D⁃BTC)动力响应参量的信息熵特征,并利用稀疏滤波从不同参量信息熵分布中无监督学习叶片裂纹的多尺度动力响应特征,实现裂纹叶片在运行过程中响应变化特征的信息熵定量描述。在此基础上,利用支持向量机(support vector machine,SVM)的强非线性映射能力建立多尺度响应特征空间与状态空间之间复杂映射。经试验证实,所提方法能实现叶片裂纹损伤程度的定量诊断,达到100%的诊断准确率,远优于其他方法,且诊断结果稳定性好。
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关键词:
- 定量诊断 /
- 涡轮叶片裂纹 /
- 三维叶尖间隙(3D⁃BTC) /
- 信息熵 /
- 稀疏滤波 /
- 支持向量机(SVM)
Abstract:By combining the 3⁃dimensional dynamic response analysis with parameter identification,the information entropy of the 3D⁃BTC (3⁃dimensional blade tip clearance) dynamic response parameters for different crack blades was analyzed,and sparse filtering was used to learn multi⁃scale dynamic response features from information entropy distribution of different response parameters in an unsupervised manner,realizing quantitative description of operational response features for different crack blades based on multi⁃scale dynamic response information entropy.On this basis,the support vector machine (SVM) was further used to construct the complex mapping relationship between the multi⁃scale response feature space and the condition space by its strong non⁃linear mapping ability.In different sets of experiments,the quantitative effectiveness of the proposed method for different crack blades was verified,and the diagnosis accuracy reached 100% far beyond other comparative methods,and the stability of diagnosis results was fairly good.
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表 1 叶片健康状态说明
Table 1. Description for health conditions of blades
类别标签 健康状态 训练集 测试集 工况参数 1 无裂纹 250 750 转速:1 500、2 000、2 500、3 000 r/min;最大叶片线速度:125.66 m/s;采样频率:10 kHz;采集时间:120 s 2 2 mm裂纹 250 750 3 4 mm裂纹 250 750 4 6 mm裂纹 250 750 表 2 本文所提方法与对比方法性能比较
Table 2. Performance comparison among proposed method and other methods
方法 SF+WPTEE SF+WPTEE(无EEMD) SF+RS BPNN SAE IDBN 数值 标准差 数值 标准差 数值 标准差 数值 标准差 数值 标准差 数值 标准差 准确率 100 0 87.27 3.58 59.00 1.74 83.06 0.96 56.08 3.56 49.71 3.48 精确率 100 0 88.86 5.26 71.02 3.20 87.38 1.38 57.61 6.81 29.87 3.08 召回率 100 0 87.32 6.59 59.00 3.70 83.09 2.52 56.08 7.21 65.60 1.88 100 0 86.92 4.90 55.34 2.59 82.53 2.76 55.11 5.90 40.10 3.11 -
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