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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2023, Vol. 57 Issue (10): 2028-2041    DOI: 10.3785/j.issn.1008-973X.2023.10.012
    
IndRNN-1DLCNN based fault diagnosis of independent metering valve-controlled hydraulic cylinder system
Wei SUN(),Heng LIU,Jian-feng TAO*(),Hao SUN,Cheng-liang LIU
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China
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Abstract  

A fault diagnosis method was proposed to address the problem of fault components identification under similar fault information representations in an independent metering valve-controlled hydraulic cylinder system. An independently recurrent neural network (IndRNN) and a one-dimensional large-kernel convolution neural network (1DLCNN) was combined in the method. An independent metering valve-controlled hydraulic cylinder system was constructed. A state-sensing scheme was presented for capturing pressure and displacement signals. The signal characteristics under different fault conditions were analyzed. A deep neural network model utilizing IndRNN-1DLCNN was established. The deep network architecture of multi-layer IndRNN with a residual structure was adopted. The 1DLCNN was developed to enhance the global information capture capability. The model structure facilitated multi-sensor information fusion and specific fault component identification. Results showed that the proposed method could accurately distinguish eight specific fault components, including four pilot valves, two main valves, displacement sensors and a hydraulic cylinder in the case of different working conditions. The overall diagnostic accuracy of the system could reach up to 96% for the discussed working conditions. The fault identification accuracy of one component was above 93% under the working condition.

Key words： independent metering control      valve-controlled hydraulic cylinder system      independently recurrent neural network      one-dimensional large-kernel convolution neural network      fault diagnosis     
Received: 21 October 2022      Published: 18 October 2023
CLC:  TH 137  
Fund:  国家重点研发计划资助项目（2020YFB2009703）；教育部-中国移动联合基金资助建设项目（MCM20180703）
Corresponding Authors: Jian-feng TAO     E-mail: fireire233@sjtu.edu.cn;jftao@sjtu.edu.cn
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Wei SUN
Heng LIU
Jian-feng TAO
Hao SUN
Cheng-liang LIU
Cite this article:

Wei SUN,Heng LIU,Jian-feng TAO,Hao SUN,Cheng-liang LIU. IndRNN-1DLCNN based fault diagnosis of independent metering valve-controlled hydraulic cylinder system. Journal of ZheJiang University (Engineering Science), 2023, 57(10): 2028-2041.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.10.012     OR     https://www.zjujournals.com/eng/Y2023/V57/I10/2028


基于IndRNN-1DLCNN的负载口独立控制阀控缸系统故障诊断

为了解决负载口独立控制阀控液压缸系统故障信息相似表征下的故障元件识别难题，提出基于独立循环神经网络(IndRNN)和一维大核卷积神经网络(1DLCNN)结合的故障诊断方法. 构建负载口独立控制阀控液压缸系统，针对系统提出压力与位移信号的状态感知方案，分析了系统故障的信号特征. 设计一种基于IndRNN-1DLCNN的深度神经网络模型，模型引入残差结构进行多层IndRNN设计并引入1DLCNN增强全局信息捕捉能力，实现多源信号的融合，识别发生故障的具体元件. 结果表明在不同的负载工况下，利用提出的方法均能够准确地将系统故障定位至4个先导阀、2个主阀、1组位移传感器以及1个液压缸共8类具体元件，系统的整体诊断准确率最高达到96%，单一元件的故障识别准确率均大于93%.


关键词： 负载口独立控制,  阀控液压缸系统,  独立循环神经网络,  一维大核卷积神经网络,  故障诊断 
Fig.1 Schematic diagram of independent metering valve-controlled hydraulic cylinder system
Fig.2 Practical diagram of independent metering valve-controlled hydraulic cylinder system
参数 参数值 参数 参数值
$ {p}_{\mathrm{s}} $ 10.00 MPa $ {M}_{\mathrm{p}} $ 0.05 kg
$ {p}_{\mathrm{s}\mathrm{p}} $ 3.20 MPa $ {D}_{\mathrm{c}} $ 140.00 mm
$ {D}_{\mathrm{v}} $ 16.00 mm $ {D}_{\mathrm{r}} $ 100.00 mm
$ {M}_{\mathrm{v}} $ 1.00 kg M 100.00 kg
$ {D}_{\mathrm{p}} $ 8.00 mm K 2.50×106 N/m
Tab.1 Valve-controlled hydraulic cylinder system parameters
Fig.3 Diagram of high-speed on/off valve driving voltage
Fig.4 Control strategy of independent metering valve-controlled hydraulic cylinder system
参数符号 参数值
PID1比例环节 $ {K}_{\mathrm{p}\mathrm{v}1}、{K}_{\mathrm{p}\mathrm{v}2} $ 60.00
PID1积分环节 $ {K}_{\mathrm{i}\mathrm{v}1}、{K}_{\mathrm{i}\mathrm{v}2} $ 0
PID1微分环节 $ {K}_{\mathrm{d}\mathrm{v}1}、{K}_{\mathrm{d}\mathrm{v}2} $ 0.10
PID1转换系数 $ {K}_{\mathrm{v}1} $ ?0.01
PID1转换系数 $ {K}_{\mathrm{v}2} $ 0.01
PID2比例环节 $ {K}_{\mathrm{p}\mathrm{l}1}、{K}_{\mathrm{p}\mathrm{l}2}、{K}_{\mathrm{p}\mathrm{r}1}、{K}_{\mathrm{p}\mathrm{r}2} $ 100.00
PID2积分环节 $ {K}_{\mathrm{i}\mathrm{l}1}、{K}_{\mathrm{i}\mathrm{l}2}、{K}_{\mathrm{i}\mathrm{r}1}、{K}_{\mathrm{i}\mathrm{r}2} $ 0
PID2微分环节 $ {K}_{\mathrm{d}\mathrm{l}1}、{K}_{\mathrm{d}\mathrm{l}2}、{K}_{\mathrm{d}\mathrm{r}1}、{K}_{\mathrm{d}\mathrm{r}2} $ 0.10
PID2转换系数 $ {K}_{\mathrm{l}1}、{K}_{\mathrm{r}1} $ 250.00
PID2转换系数 $ {K}_{\mathrm{l}2}、{K}_{\mathrm{r}2} $ ?250.00
Tab.2 Controller parameters of valve-controlled hydraulic cylinder system
Fig.5 Diagram of system model structure
Fig.6 Valve low characteristic validation
Fig.7 Step response characteristic validation
Fig.8 Validation of system step response characteristic
Fig.9 Sleeve rustiness of high-speed on/off valve
类型 正常值区间 故障值区间
${d}_{\mathrm{C} }$/s [0， 0.0003] (0.0003， 0.0010]
$ {f}_{\mathrm{C}} $/Hz [48， 52] [40， 48)， (52， 60]
${N}_{\mathrm{P} }$/N [1.3， 1.5] [0.6， 1.3)
kP/(N·mm?1) [4.6， 4.8] [3.5， 4.6)
Tab.3 Fault parameters of pilot valve
Fig.10 Fault diagram of left pilot valve1
参数 正常值区间 故障值区间
rV/mm [0.001， 0.015] (0.015， 0.080]
lV/mm [0.001， 0.015] (0.015， 0.080]
NV/N [133， 149] [70， 133)
kV/(N·mm?1) [13.4， 14.8] [7.0， 13.4)
Tab.4 Fault parameters of main valve
Fig.11 Fault diagram of left main valve
参数 正常值区间 故障值区间
$ {\delta }_{\mathrm{V}} $/mm [0， 0.03] (0.03， 0.15]
$ {\delta }_{\mathrm{C}} $/mm [0， 0.01] (0.01， 0.50]
Tab.5 Fault parameters of displacement sensors feedback
Fig.12 Network diagram of multi-layer IndRNN
Fig.13 Network diagram of multi-layer 1DLCNN
Fig.14 IndRNN-1DLCNN-based fault diagnostic model
故障类型 标签 故障类型 标签 故障类型 标签
系统无故障 0 左先导阀1故障 3 右主阀故障 6
左先导阀1故障 1 左先导阀2故障 4 液压缸故障 7
左先导阀2故障 2 左主阀故障 5 传感器故障 8
Tab.6 Fault labels of system
网络层 输入维度 输出维度 关键参数
IndRNN 9×2000 64×2000 IndRNN单元个数：7
隐层特征个数：64
残差连接个数：3
1DLCNN 64×2000 120×39 卷积核大小：100
步长：50
MaxPooling1 120×29 120×5 池化核大小：20
步长：4
1DCNN 120×5 200×3 卷积核大小：3
步长：1
MaxPooling2 200×3 200×1 池化核大小：3
步长：1
Tab.7 Model parameters of IndRNN-1DLCNN
模型 精度/% 模型 精度/%
LSTM 25.6 IndRNN 84.7
2DCNN 87.9 1DLCNN 90.9
1DCNN 85.1 IndRNN-1DLCNN 96.0
Tab.8 Fault diagnosis accuracy for system
Fig.15 Confusion matrix of test set for fault diagnosis
Fig.16 Feature visualization of fault diagnosis
Fig.17 Fault diagnosis accuracy under different conditions
模型 ACC/%
工况A 工况B 工况C
2DCNN 87.9 89.1 90.2
1DCNN 85.1 84.5 86.7
IndRNN 84.7 84.8 83.7
1DLCNN 90.9 93.0 91.3
IndRNN-1DLCNN 96.0 96.0 95.4
Tab.9 Fault diagnosis accuracy under different conditions
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