Fault detection method of unequal-length batch process based on VGDTW-MCVA

doi:10.11949/0438-1157.20190349

Abstract

Abstract:

Aiming at the problem that batch data synchronization in unequal-length batch process monitoring fails to fully exploit local information, this paper proposes a variable grouping dynamic time warping-multiway canonical variate analysis (VGDTW-CVA) algorithm for unequal-length batch process fault detection. First, the mutual information matrix is used to describe the correlation between variables of unequal-length batch process, and all the variables are divided into serval groups based on mutual information matrix. Then use the DTW algorithm to synchronize each variable group separately, and integrate the synchronized variable groups into a complete 3D data set. Finally, MCVA method is utilized to establish dynamic monitoring model for online monitoring of batch production process. The simulation results on the penicillin simulation system show that the VGDTW-MCVA has better monitoring effect for the unequal-length batch production process.

Key words: unequal-length batch process, local information exploiting, variable grouping, mutual information, dynamic time warping, canonical variate analysis, fault detection

摘要：

针对不等长间歇过程监控中批次数据同步化未能充分挖掘局部信息的问题，提出一种基于变量分组DTW-MCVA（VGDTW-CVA）的不等长间歇过程故障检测方法。首先，利用互信息矩阵描述不等长间歇过程测量变量之间的相关性，并基于互信息矩阵进行变量分组。然后利用DTW算法对各个变量组分别进行同步化，并将同步化后的变量组整合为完整的三维数据集。最后，利用MCVA方法建立动态监控模型实现对间歇生产过程的在线监控。盘尼西林发酵过程的仿真结果表明，VGDTW-MCVA能够比基本的DTW-MCVA方法更好地监控间歇过程故障。

关键词: 不等长间歇过程, 局部信息挖掘, 变量分组, 互信息, 动态时间规整, 多向典型变量分析, 故障检测

CLC Number:

TP 277

Lei YU, Xiaogang DENG, Yuping CAO, Kaiqi LU. Fault detection method of unequal-length batch process based on VGDTW-MCVA[J]. CIESC Journal, 2019, 70(9): 3441-3448.

于蕾, 邓晓刚, 曹玉苹, 路凯琪. 基于变量分组DTW-MCVA的不等长间歇过程故障检测方法[J]. 化工学报, 2019, 70(9): 3441-3448.

Figures/Tables 10

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故障	描述
1	底物流加速率在100~400 h施加+0.004/100 h斜坡干扰
2	通风速率在100~400 h施加+0.5/100 h斜坡干扰
3	搅拌速率在100~400 h施加+3/100 h斜坡干扰

故障	描述
1	底物流加速率在100~400 h施加+0.004/100 h斜坡干扰
2	通风速率在100~400 h施加+0.5/100 h斜坡干扰
3	搅拌速率在100~400 h施加+3/100 h斜坡干扰

序号	变量号
1	1、2、3
2	4、7、8
3	5、6、9、10

序号	变量号
1	1、2、3
2	4、7、8
3	5、6、9、10

故障	DTW-MCVA		VGDTW-MPCA		VGDTW-MCVA
故障	T ²	SPE	T ²	SPE	T ²	SPE
1	67.79	61.07	64.00	70.00	75.84	80.54
2	94.63	85.91	88.00	78.67	95.97	91.95
3	94.63	93.96	80.67	80.00	83.22	97.32