Modeling approach for turbofan engines based on intelligent multi-feature extraction and interval type-2 fuzzy sets
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摘要:
考虑涡扇发动机在包线内大范围工况变化下的强非线性、强不确定性特点,提出一种基于多元特征智能提取的涡扇发动机全包线区间二型(IT2)模糊模型建模方法。设计并提取涡扇发动机全包线多元特征参数,利用改进的判别邻域嵌入算法(IDNE)对多元特征参数降维处理,并结合模糊C均值算法(FCM)求取典型特征,避免传统聚类算法在高维空间失效。在典型特征点处辨识模糊规则后件变量模型。优化获得IT2型隶属度函数,提高存在不确定性时模糊模型精度,最终建立了小涵道比涡扇发动机IT2模糊模型。开展了全包线内模型性能验证,结果表明IT2模糊模型与部件级模型输出相比,平均方均根误差(ARMSE)小于0.20%,具有较高精度;在退化等不确定性作用下,IT2模糊模型精度变化小于0.05%,显著优于一型模糊模型,具有更强的不确定性表征能力;IT2模糊模型单次计算平均耗时为3.9 ms,具有良好的实时性。
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关键词:
- 涡扇发动机 /
- 区间二型模糊模型 /
- 特征参数提取 /
- 改进判别邻域嵌入算法 /
- 模糊C均值算法
Abstract:Considering turbofan engine’s strong nonlinearity and significant uncertainty within wide operational ranges, a new modeling approach for turbofan engines in the full flight envelope was proposed based on multi-feature extraction and interval type-2 (IT2) fuzzy sets. The engine multi-feature parameters were designed and extracted. To avoid the failure of traditional clustering algorithms in high-dimensional spaces, an improved discriminant neighborhood embedding algorithm (IDNE) was developed for dimensionality reduction of multi-feature parameters and collaborated with the fuzzy C-means algorithm (FCM) to extract the typical features. The consequent models were identified at typical feature points. The IT2 membership functions were optimized to improve the accuracy of the fuzzy model under uncertainty. Finally, an IT2 fuzzy model for a low bypass ratio turbofan engine was established. Model performance within the flight envelope was validated. The results showed that the model had high accuracy as the average root mean square error (ARMSE) was less than 0.20%. Under degradation uncertainties, the IT2 fuzzy model’s accuracy variation was less than 0.05%, significantly better than the type-1 fuzzy model, which showed a better uncertainty representation capability. The resulting model demonstrated an excellent real-time performance with around 3.9 ms for its average computation time per instance.
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$ \boldsymbol {\psi } $ 前件变量 $ \tau $ 作用力设计参数 $ {\boldsymbol {M}}_{i} $ 第i条规则对应的前件区间二型模糊集合 $ \rho $ 多元参数间的距离 $ \boldsymbol {x} $ 系统状态变量 $ {\lambda }_{i} $ P矩阵第i个列向量对应的拉格朗日乘子 $ \boldsymbol {u} $ 系统控制变量 $ \boldsymbol {F} $ 作用力矩阵 $ \boldsymbol {y} $ 系统输出变量 $ \boldsymbol {S} $ 求和后对角作用力矩阵 $ {f}_{\text{UMF}} $ 上隶属度函数 $ {\boldsymbol {P}}^{*} $ 最优转换矩阵 $ {f}_{\text{LMF}} $ 下隶属度函数 $ s $ 转换前特征参数维度 $ {f}_{\text{EFS}} $ 嵌入T1模糊集 $ d $ 转换后特征参数维度 $ {h}_{i} $ 第$ i $条规则的激活强度 $ {N}_{\text{C}} $ 聚类个数 $ {\underline{\mu }}_{j,i} $ 第$ i $条规则的第$ j $个前件变量的下隶属度函数 $ \boldsymbol {U} $ 隶属度矩阵 $ {\overline{\mu }}_{j,i} $ 第$ i $条规则的第$ j $个前件变量的上隶属度函数 $ \boldsymbol {V} $ 聚类中心点的集合 $ {\delta }_{j,i} $ 第$ i $条规则的第$ j $个前件变量的隶属度设计参数 $ m $ 模糊权重系数 $ H $ 高度 $ {E}_{\text{SS}} $ 误差平方和(SSE) $ Ma $ 马赫数 $ {{\boldsymbol{\varTheta }}}_{\text{C}i} $ 第i类的聚类中心点 $ {n}_{\mathrm{H}} $ 高压转速 $ {\kappa }_{\text{SC}} $ 轮廓系数 $ {\lambda }_{\mathrm{R}} $ 主导极点的实部 $ \overline{{E}_{\text{RMS}}} $ 平均方均根误差(ARMSE) $ {\lambda }_{\mathrm{I}} $ 主导极点的虚部 $ {R}_{\text{EP}} $ 发动机落压比(EPR) $ \boldsymbol {K} $ 系统稳态增益矩阵 $ {W}_{\mathrm{fb}} $ 主燃油流量 $ {\boldsymbol{\varTheta }} $ 多元特征参数 $ {A}_{8} $ 尾喷口喉道面积 $ \boldsymbol {P} $ DNE算法转换矩阵 $ {n}_{\mathrm{L}} $ 低压转子转速 $ \Delta (\boldsymbol {P}) $ 类内紧度 $ {T}_{43} $ 涡轮间总温 $ \delta (\boldsymbol {P}) $ 类间散度 $ {p}_{6} $ 低压涡轮出口总压 $ {f}_{ij} $ 第i个和第j个特征参数之间的作用力 $ {T}_{3} $ 压气机出口总温 表 1 工作点A和工作点B动态特性对比
Table 1. Comparison of dynamic characteristic between operating points A and B
工作点 $ {\lambda }_{\mathrm{R}} $ $ {\lambda }_{\mathrm{I}} $ A 1.79 0 B 1.78 0 表 2 工作点C和工作点D稳态特性对比
Table 2. Comparison of steady-state characteristics between operating points C and D
工作点 $ {k}_{11} $ $ {k}_{12} $ $ {k}_{21} $ $ {k}_{22} $ C 7.74 5.66 −4.05 −2.79 D 7.74 5.66 −4.18 −2.78 表 3 改进的DNE-FCM算法聚类结果
Table 3. Clustering results of improved DNE-FCM algorithm
典型特征点 $ H/\mathrm{km} $ $ Ma $ $ {n}_{\mathrm{H}}/\text{%} $ 1 7.90 0.86 88 2 5.77 0.74 79 3 4.58 0.71 82 4 8.56 0.96 91 5 7.02 0.88 84 6 11.89 1.19 95 表 4 模糊模型后件变量
Table 4. Fuzzy model consequence variables
典型特征点 后件变量 1 $ {\boldsymbol {A}}_{1}=\left[\begin{matrix}5.3\text{3} & -2.9\text{1}\\123.\text{50} & -51.4\text{7}\end{matrix}\right]\quad\quad {\boldsymbol {B}}_{1}=\left[\begin{matrix}0.\text{50} & -1.1\text{2}\\4.79 & -20.71\end{matrix}\right] $
$ {\boldsymbol {C}}_{1}={\left[\begin{matrix}1 & 0 & 2.170\;7 & -1.414\;3 & 1.393\;1 & 1.075\;3\\0 & 1 & -0.370\;7 & 0.093\;0 & 0.035\;6 & -0.024\;5\end{matrix}\right]}^{\mathrm{T}} $
$ {\boldsymbol {D}}_{1}={\left[\begin{matrix}0 & 0 & 0.014\;2 & 0.397\;3 & 0.037\;0 & 0.053\;6\\0 & 0 & -0.033\;1 & 0.079\;5 & -0.219\;6 & -0.048\;2\end{matrix}\right]}^{\mathrm{T}} $$ \vdots $ $ \vdots $ 6 $ {\boldsymbol {A}}_{6}=\left[\begin{matrix}5.\text{30} & -2.0\text{8}\\159.4\text{9} & -47.8\text{7}\end{matrix}\right] \quad\quad {\boldsymbol {B}}_{6}=\left[\begin{matrix}0.4\text{2} & -1.10\\4.3\text{2} & -26.8\text{6}\end{matrix}\right] $
$ {\boldsymbol {C}}_{6}={\left[\begin{matrix}1 & 0 & 3.910\;3 & -1.306\;7 & 1.460\;0 & 0.870\;2\\0 & 1 & -0.270\;7 & -0.019\;3 & 0.124\;1 & 0.042\;2\end{matrix}\right]}^{\mathrm{T}} $
$ {\boldsymbol {D}}_{6}={\left[\begin{matrix}0 & 0 & -0.062\;3 & 0.456\;0 & 0.026\;6 & 0.063\;3\\0 & 0 & -0.020\;1 & 0.099\;8 & -0.235\;4 & -0.048\;4\end{matrix}\right]}^{\mathrm{T}} $表 5 各输出变量$ {{\boldsymbol{E}}}_{\bf{RMSmax}} $和$ \overline{{{\boldsymbol{E}}}_{\bf{RMS}}} $
Table 5. $ {{\boldsymbol{E}}}_{\bf{RMSmax}} $ and $ \overline{{{\boldsymbol{E}}}_{\bf{RMS}}} $ of output variables
输出
变量$ {W}_{\mathrm{fb}} $2%阶跃 $ {A}_{8} $2%阶跃 $ {E}_{\text{RMS}}{}_{\max } $/% $ \overline{{E}_{\text{RMS}}} $/% $ {E}_{\text{RMS}}{}_{\max } $/% $ \overline{{E}_{\text{RMS}}} $/% $ {n}_{\mathrm{H}} $ 0.16 0.03 0.41 0.03 $ {R}_{\text{EP}} $ 0.59 0.14 1.6 0.17 $ {n}_{\mathrm{L}} $ 0.61 0.15 1.8 0.20 $ {T}_{43} $/K 0.20 0.04 0.54 0.07 $ {p}_{6} $/MPa 1.04 0.18 0.83 0.17 $ {T}_{3} $/K 0.12 0.03 0.23 0.03 表 6 IT2与T1模糊模型各输出变量$ \overline{{{\boldsymbol{E}}}_{\bf{RMS}}} $
Table 6. $ \overline{{{\boldsymbol{E}}}_{\bf{RMS}}} $ of the IT2 and T1 fuzzy model output variables
输出
变量$ {W}_{\mathrm{fb}} $2%阶跃$ \overline{{E}_{\text{RMS}}} $/% $ {A}_{8} $2%阶跃$ \overline{{E}_{\text{RMS}}} $/% IT2 T1 IT2 T1 $ {n}_{\mathrm{H}} $ 0.03 0.04 0.05 0.06 $ {R}_{\text{EP}} $ 0.14 0.31 0.17 0.29 $ {n}_{\mathrm{L}} $ 0.15 0.22 0.20 0.23 $ {T}_{43} $/K 0.04 0.07 0.07 0.11 $ {p}_{6} $/MPa 0.18 0.27 0.17 0.22 $ {T}_{3} $/K 0.03 0.06 0.03 0.05 表 7 旋转部件性能变化程度
Table 7. Degree of performance variation of rotating parts
部件 健康参数 效率系数 变化程度/% 流量系数 变化程度/% Fan $ {C}_{\text{SE1}} $ −3 $ {C}_{\text{SW1}} $ −4 HPC $ {C}_{\text{SE2}} $ −6 $ {C}_{\text{SW2}} $ −8 HPT $ {C}_{\text{SE3}} $ −3 $ {C}_{\text{SW3}} $ 2 LPT $ {C}_{\text{SE4}} $ −2 $ {C}_{\text{SW4}} $ 1 表 8 不同不确定性模式中的部件性能变化
Table 8. Variation in component performance under different uncertainty modes
不确定性模式 性能变化部件 1 标称状态(无部件性能变化) 2 HPC和HPT性能变化 3 全部部件性能变化 表 9 模糊模型计算时间
Table 9. Fuzzy model calculation time
模糊
模型模型计算耗时/ms 工作点1 工作点2 $ \cdots $ 工作点 2478 平均耗时 T1 5.5 4.1 $ \cdots $ 3.8 3.9 IT2 5.5 4.0 $ \cdots $ 3.9 3.9 -
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