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学者姓名：雷亚国
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Abstract ：
The application of robotic technologies in building construction leads to great convenience and productivity improvement, and construction robots (CRs) bring enormous opportunities for the way we conduct design and construction. To get a better understanding of the trends and track the application of CRs for on-site conditions, this paper conducts a systematic review of control models and status monitoring of CRs, which are two key aspects that determine construction accuracy and efficiency. Control accuracy and flexibility are primary needs for CRs applied in different scenes, so the control methods based on driving models are vitally important. Status monitoring on CRs contains knowledge in fault detection, intelligence maintenance, and fault-tolerant control, and multiple objectives need to be met and optimized in the whole drive chain. Moreover, the state-of-the-art is comprehensively summarized, and new insights are also provided to carry on promising researches.
Keyword ：
construction robot control strategy dynamic model intelligent operation and maintenance
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| GB/T 7714 | Shi, Huaitao , Li, Ranran , Bai, Xiaotian et al. A review for control theory and condition monitoring on construction robots [J]. | JOURNAL OF FIELD ROBOTICS , 2023 . |
| MLA | Shi, Huaitao et al. "A review for control theory and condition monitoring on construction robots" . | JOURNAL OF FIELD ROBOTICS (2023) . |
| APA | Shi, Huaitao , Li, Ranran , Bai, Xiaotian , Zhang, Yixing , Min, Linggang , Wang, Dong et al. A review for control theory and condition monitoring on construction robots . | JOURNAL OF FIELD ROBOTICS , 2023 . |
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Abstract ：
Deep learning (DL) based diagnosis models have to be trained by large quantities of monitoring data of machines. However, in real-case scenarios, machines operate under the normal condition in most of their life time while faults seldom happen. Therefore, though massive data are accessible, most are data of the normal condition while fault data are still extremely limited. In other words, fault diagnosis of real machines is actually a few-shot diagnosis problem. To deal with few-shot diagnosis, this article proposes adaptive knowledge transfer with multiclassifier ensemble (AKTME) under the paradigm of continual machine learning. In AKTME, knowledge learned by DL models is considered to be represented by the learnable filter kernels (FKs). The key of AKTME is a proposed continual weighted updating (CWU) technique of FKs. By CWU, shared FKs are distilled from multiple auxiliary tasks and adaptively transferred to the target task. Then by multiclassifier ensemble, AKTME is able to recognize faults with few fault data accessible. AKTME is applied on two few-shot diagnosis cases. Results verify that AKTME achieves higher diagnosis accuracies than recently proposed methods. Moreover, AKTME tends to improve the diagnosis accuracy as it prelearns on more auxiliary tasks continually.
Keyword ：
Adaptation models Continual machine learning (CML) Data models Fault diagnosis few-shot learning Kernel Knowledge transfer mechanical fault diagnosis restricted Boltzmann machine Task analysis Training transfer learning
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| GB/T 7714 | Xing, Saibo , Lei, Yaguo , Yang, Bin et al. Adaptive Knowledge Transfer by Continual Weighted Updating of Filter Kernels for Few-Shot Fault Diagnosis of Machines [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (2) : 1968-1976 . |
| MLA | Xing, Saibo et al. "Adaptive Knowledge Transfer by Continual Weighted Updating of Filter Kernels for Few-Shot Fault Diagnosis of Machines" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 69 . 2 (2022) : 1968-1976 . |
| APA | Xing, Saibo , Lei, Yaguo , Yang, Bin , Lu, Na . Adaptive Knowledge Transfer by Continual Weighted Updating of Filter Kernels for Few-Shot Fault Diagnosis of Machines . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (2) , 1968-1976 . |
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Abstract ：
Remaining useful life (RUL) prediction and maintenance optimization are two critical and sequentially connected modules in the prognostics and health management of machines. Due to the advantages of obtaining more accurate RUL prediction results and the effectiveness of addressing replacement scheduling and spare parts provision dynamically, ensemble RUL prediction and online joint replacement-order optimization are paid specific attention to. Despite substantial works on those two aspects, there are still two limitations that compromise their performances in practical applications: 1) Existing ensemble RUL prediction methods neglected the nonlinear relationships among individual prediction models. 2) No online joint optimization model that utilizes ensemble RUL information is available. Faced with these two limitations, this paper first proposes a nonlinear ensemble RUL prediction method, which takes nonlinear relationships among models into consideration. Furthermore, an online joint replacement-order model is formulated using the ensemble RUL prediction results, and an iterated local search based optimization algorithm is utilized for dynamically finding the near-optimal joint policies. Through the experimental study of milling cutter life tests, the proposed nonlinear ensemble RUL prediction method is verified with higher accuracy, and the joint optimization model utilizing the ensemble RUL results is shown to provide more effective joint policies.
Keyword ：
machine Nonlinear ensemble Online joint optimization Prognostics and health management of  Remaining useful life prediction
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| GB/T 7714 | Yan, Tao , Lei, Yaguo , Li, Naipeng et al. Online joint replacement-order optimization driven by a nonlinear ensemble remaining useful life prediction method [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2022 , 173 . |
| MLA | Yan, Tao et al. "Online joint replacement-order optimization driven by a nonlinear ensemble remaining useful life prediction method" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 173 (2022) . |
| APA | Yan, Tao , Lei, Yaguo , Li, Naipeng , Si, Xiaosheng , Pintelon, Liliane , Dewil, Reginald . Online joint replacement-order optimization driven by a nonlinear ensemble remaining useful life prediction method . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2022 , 173 . |
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Abstract ：
Remaining useful life (RUL) prediction is critical for ensuring the safe and efficient operation of machinery. Due to the existence of multiple influencing factors, the degradation of machinery is often described as dependent competing failure processes (DCFPs). Extensive studies have been conducted on the degradation modeling and RUL prediction for DCFPs. However, they suffer from two limitations: 1) no analytical expression is available for RUL prediction under the first passage time (FPT) concept, and 2) the offline estimation and online update of parameters have not been jointly addressed. Faced with these limitations, this paper investigates the degradation modeling and RUL prediction for DCFPs. The considered DCFPs comprise of soft failure processes subject to gradual degradation and random shocks, and hard failure processes induced by random shocks. First, degradation models for both soft and hard failure processes are formulated, and the FPT-based analytical expression of RUL is correspondingly derived. Second, the offline estimation and online update of parameters are jointly addressed. A sequential estimation scheme is developed for offline estimation, then the estimated results are updated using a specifically designed total variation multiple model particle filter. Finally, a numerical example and an experimental study are provided for demonstration. © 2021 Elsevier Ltd
Keyword ：
Forecasting Machinery Monte Carlo methods Parameter estimation
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| GB/T 7714 | Yan, Tao , Lei, Yaguo , Li, Naipeng et al. Degradation modeling and remaining useful life prediction for dependent competing failure processes [J]. | Reliability Engineering and System Safety , 2021 , 212 . |
| MLA | Yan, Tao et al. "Degradation modeling and remaining useful life prediction for dependent competing failure processes" . | Reliability Engineering and System Safety 212 (2021) . |
| APA | Yan, Tao , Lei, Yaguo , Li, Naipeng , Wang, Biao , Wang, Wenting . Degradation modeling and remaining useful life prediction for dependent competing failure processes . | Reliability Engineering and System Safety , 2021 , 212 . |
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Abstract ：
Health condition monitoring of machinery has entered into the big data era, which brings new opportunities to machinery fault diagnosis. However, due to the abnormal operating environment, disturbance from human and fault data acquisition devices, condition-monitoring data generally include lots of data with abnormal or missing values, which reduces the quality of data seriously. Wrong diagnosis results are probably obtained from the analysis of the low-quality data, leading to inappropriate strategy of machinery maintenance. To solve this problem, a condition-monitoring vibration data recovery method is proposed based on tensor decomposition. A four-order tensor including rotational speed, time-domain window, multi-scale using wavelet transform, and time is constructed. Tucker decomposition is used to process this four-order tensor for extracting the information of health condition and missing data are recovered by tensor completion. Simulated data and real vibration data are used to verify the effectiveness of the proposed method, respectively. The result shows that the data recovered by the proposed method are more close to the real data, compared with traditional data recovery methods, which demonstrates its effectiveness for data recovery in data quality assurance. The proposed method is applied to improve the quality of the condition-monitoring data collected from wind power equipment. © 2021 Journal of Mechanical Engineering.
Keyword ：
Condition monitoring Data acquisition Health Machinery Quality assurance Recovery Tensors Time domain analysis Wavelet transforms Wind power
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| GB/T 7714 | Lei, Yaguo , Xu, Xuefang , Cai, Xiao et al. Research on Data Quality Assurance for Health Condition Monitoring of Machinery [J]. | Journal of Mechanical Engineering , 2021 , 57 (4) : 1-9 . |
| MLA | Lei, Yaguo et al. "Research on Data Quality Assurance for Health Condition Monitoring of Machinery" . | Journal of Mechanical Engineering 57 . 4 (2021) : 1-9 . |
| APA | Lei, Yaguo , Xu, Xuefang , Cai, Xiao , Li, Naipeng , Kong, Detong , Zhang, Yongming . Research on Data Quality Assurance for Health Condition Monitoring of Machinery . | Journal of Mechanical Engineering , 2021 , 57 (4) , 1-9 . |
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Abstract ：
Predictive maintenance is one of the most promising ways to reduce the operation and maintenance (O&M) costs of wind turbines (WTs). Remaining useful life (RUL) prediction is the basis for predictive maintenance decision. Self-data-driven methods predict the RUL of a WT driven by its own condition monitoring data without depending on failure event data. Therefore, they are applicable in industrial cases where no sufficient failure event data is available. One challenging issue for RUL prediction of WTs is that they generally suffer from varying rotating speeds. The speed variation has serious impact on the degradation rates as well as the amplitudes of state observations. To deal with this issue, this paper proposes a self-data-driven RUL prediction method for WTs considering continuously varying speeds. In the method, a generalized cumulative degradation model is constructed to describe the degradation process of WTs under continuously varying speeds. A baseline transformation algorithm is developed to transform health state observations under varying speeds into a baseline speed. A continuous trigging algorithm is employed to determine the first degradation time (FDT) for degradation modeling and the first predicting time (FPT) for RUL prediction. The best fitting model is selected adaptively to keep in line with the degradation trend of interest. The effectiveness of the method is demonstrated using a simulation case study and an industrial case study. © 2021 Elsevier Ltd
Keyword ：
Condition monitoring Degradation Forecasting Maintenance Speed Wind turbines
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| GB/T 7714 | Li, Naipeng , Xu, Pengcheng , Lei, Yaguo et al. A self-data-driven method for remaining useful life prediction of wind turbines considering continuously varying speeds [J]. | Mechanical Systems and Signal Processing , 2021 , 165 . |
| MLA | Li, Naipeng et al. "A self-data-driven method for remaining useful life prediction of wind turbines considering continuously varying speeds" . | Mechanical Systems and Signal Processing 165 (2021) . |
| APA | Li, Naipeng , Xu, Pengcheng , Lei, Yaguo , Cai, Xiao , Kong, Detong . A self-data-driven method for remaining useful life prediction of wind turbines considering continuously varying speeds . | Mechanical Systems and Signal Processing , 2021 , 165 . |
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Abstract ：
The reliable and explainable diagnosis of severity level for Parkinson's disease (PD) is significant for the therapy. Nonetheless, there are little data for severe PD patients but abundant data for slight PD patients, and this imbalanced distribution reduces the accuracy of diagnosis. Besides, the intrinsic differences for different severity levels are still unclear due to the individual differences and similarity of gait. To figure out the gait differences toward the development of PD severity level, gait features like time and force features as well as their coefficient of variance and asymmetry index have been extracted and compared. To overcome the imbalance influence during the severity level diagnosis, an ensemble K-nearest neighbor (EnKNN) is proposed. The K-nearest neighbor algorithm is applied to construct the base classifiers with extracted features, then the weight of each base classifier is calculated by the G-mean score and the F-measure. Finally, base classifiers are integrated by weight voting. Results show that the proposed EnKNN can achieve an average accuracy of 95.02% (0.44%) for PD severity level diagnosis overwhelming the imbalanced distribution of data. Additionally, some gait features exhibit distinct change with the increase of PD severity level which helps to a reliable and explainable diagnosis. © 2021 Elsevier Ltd
Keyword ：
Classification (of information) Diagnosis Disease control Gait analysis Motion compensation Nearest neighbor search Neurodegenerative diseases Pattern recognition
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| GB/T 7714 | Zhao, Huan , Wang, Ruixue , Lei, Yaguo et al. Severity level diagnosis of Parkinson's disease by ensemble K-nearest neighbor under imbalanced data [J]. | Expert Systems with Applications , 2021 , 189 . |
| MLA | Zhao, Huan et al. "Severity level diagnosis of Parkinson's disease by ensemble K-nearest neighbor under imbalanced data" . | Expert Systems with Applications 189 (2021) . |
| APA | Zhao, Huan , Wang, Ruixue , Lei, Yaguo , Liao, Wei-Hsin , Cao, Hongmei , Cao, Junyi . Severity level diagnosis of Parkinson's disease by ensemble K-nearest neighbor under imbalanced data . | Expert Systems with Applications , 2021 , 189 . |
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Abstract ：
Transforming nonlinear degradation paths into nearly linear ones has been widely used for nonlinear degradation modeling and prognostics. However, types of the current transformation functions are difficult to determine. This paper addresses issues in nonlinear stochastic degradation modeling and prognostics from a Box-Cox transformation (BCT) perspective. Specifically, the BCT is first used to transform the nonlinear degradation data into nearly linear data, and then the Wiener process with random drift is utilized to model the evolving process of the transformed data. To determine the model parameters, a two-stage estimation procedure is developed including offline stage and online stage. In the offline stage, the parameters are determined via maximum likelihood estimation method based on the historical degradation data and such estimated values are used to initialize the online stage. During the online stage, the Bayesian method is adopted to update the model parameters using the data of the degrading system in service, in which the hyperparameters are updated by the expectation maximization algorithm. A closed-form solution to remaining useful life with updated model parameters is further derived for prognostics. Finally, case studies for lithium-ion batteries and liquid coupling devices are provided to demonstrate the proposed approach. © 2021
Keyword ：
Bayesian networks Image segmentation Lithium-ion batteries Mathematical transformations Maximum likelihood estimation Maximum principle Parameter estimation Stochastic systems Systems engineering
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| GB/T 7714 | Si, Xiao-Sheng , Li, Tianmei , Zhang, Jianxun et al. Nonlinear degradation modeling and prognostics: A Box-Cox transformation perspective [J]. | Reliability Engineering and System Safety , 2021 , 217 . |
| MLA | Si, Xiao-Sheng et al. "Nonlinear degradation modeling and prognostics: A Box-Cox transformation perspective" . | Reliability Engineering and System Safety 217 (2021) . |
| APA | Si, Xiao-Sheng , Li, Tianmei , Zhang, Jianxun , Lei, Yaguo . Nonlinear degradation modeling and prognostics: A Box-Cox transformation perspective . | Reliability Engineering and System Safety , 2021 , 217 . |
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Abstract ：
Semi-observable systems are referred to as a kind of widely used industrial equipment whose physical degradation state is only observable via shutdown inspection. To monitor the degradation process of semi-observable systems online, different types of sensors are generally employed to collect monitoring signals. Lots of studies have been conducted to fuse multi-sensor signals to predict remaining useful life (RUL). Majority of them, however, ignored the partially available state observations which can be viewed as ground truth measurements of physical degradation. To deal with this problem, this article proposes a multi-sensor data-driven RUL prediction method for semi-observable systems, which leverages degradation information from online multi-sensor signals as well as offline state observations. This method is developed based on a generalizable state-space model combined with particle filtering framework. In the framework, a state transition function is used to describe the degradation process of system states. A multidimensional measurement function is constructed to describe the mapping between states and multi-sensor signals. To enhance the performance of prediction, an algorithm named prioritized sensor group selection is also proposed to select the optimal sensor group for RUL prediction. The effectiveness of the proposed method is demonstrated using an experiment of cutting tool wear.
Keyword ：
Degradation Inspection Monitoring Multi-sensor data particle filtering (PF) Predictive models prognostic degradation modeling remaining useful life (RUL) prediction Sensors Sensor systems State-space methods state-space model
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| GB/T 7714 | Li, Naipeng , Lei, Yaguo , Gebraeel, Nagi et al. Multi-Sensor Data-Driven Remaining Useful Life Prediction of Semi-Observable Systems [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2021 , 68 (11) : 11482-11491 . |
| MLA | Li, Naipeng et al. "Multi-Sensor Data-Driven Remaining Useful Life Prediction of Semi-Observable Systems" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 68 . 11 (2021) : 11482-11491 . |
| APA | Li, Naipeng , Lei, Yaguo , Gebraeel, Nagi , Wang, Zhijian , Cai, Xiao , Xu, Pengcheng et al. Multi-Sensor Data-Driven Remaining Useful Life Prediction of Semi-Observable Systems . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2021 , 68 (11) , 11482-11491 . |
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Abstract ：
To integrate the complete degradation information of machinery, deep learning-based prognostics approaches usually use monitoring data acquired by different sensors as the inputs of networks. These approaches, however, lack an explicit learning mechanism to effectively identify the distinctions of different sensor data and highlight the important degradation information, thereby affecting the accuracy of deep prognostics networks and limiting their generalization. To overcome the aforementioned weaknesses, a new deep prognostics framework named multiscale convolutional attention network (MSCAN) is proposed in this article for predicting the remaining useful life (RUL) of machinery. In the proposed MSCAN, self-attention modules are first constructed to effectively fuse the input multisensor data. Then, a multiscale learning strategy is developed to automatically learn representations from different temporal scales. Finally, the learned high-level representations are fed into dynamic dense layers to perform regression analysis and RUL estimation. The proposed MSCAN is evaluated using multisensor monitoring data from life testing of milling cutters, and also compared with some state-of-the-art prognostics approaches. Experimental results demonstrate the effectiveness and superiority of the proposed MSCAN in fusing multisensor information and improving RUL prediction accuracy.
Keyword ：
Convolution Convolutional neural network (CNN) deep learning Degradation Estimation Feature extraction Machinery Monitoring multiscale learning remaining useful life (RUL) prediction self-attention mechanism Sensors
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| GB/T 7714 | Wang, Biao , Lei, Yaguo , Li, Naipeng et al. Multiscale Convolutional Attention Network for Predicting Remaining Useful Life of Machinery [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2021 , 68 (8) : 7496-7504 . |
| MLA | Wang, Biao et al. "Multiscale Convolutional Attention Network for Predicting Remaining Useful Life of Machinery" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 68 . 8 (2021) : 7496-7504 . |
| APA | Wang, Biao , Lei, Yaguo , Li, Naipeng , Wang, Wenting . Multiscale Convolutional Attention Network for Predicting Remaining Useful Life of Machinery . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2021 , 68 (8) , 7496-7504 . |
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