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Smart Structures and Systems Volume 32, Number 3, September 2023 , pages 179-193 DOI: https://doi.org/10.12989/sss.2023.32.3.179 |
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A hybrid deep neural network compression approach enabling edge intelligence for data anomaly detection in smart structural health monitoring systems |
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Tarutal Ghosh Mondal, Jau-Yu Chou, Yuguang Fu and Jianxiao Mao
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| Abstract | ||
| This study explores an alternative to the existing centralized process for data anomaly detection in modern Internet of Things (IoT)-based structural health monitoring (SHM) systems. An edge intelligence framework is proposed for the early detection and classification of various data anomalies facilitating quality enhancement of acquired data before transmitting to a central system. State-of-the-art deep neural network pruning techniques are investigated and compared aiming to significantly reduce the network size so that it can run efficiently on resource-constrained edge devices such as wireless smart sensors. Further, depthwise separable convolution (DSC) is invoked, the integration of which with advanced structural pruning methods exhibited superior compression capability. Last but not least, quantization-aware training (QAT) is adopted for faster processing and lower memory and power consumption. The proposed edge intelligence framework will eventually lead to reduced network overload and latency. This will enable intelligent self-adaptation strategies to be employed to timely deal with a faulty sensor, minimizing the wasteful use of power, memory, and other resources in wireless smart sensors, increasing efficiency, and reducing maintenance costs for modern smart SHM systems. This study presents a theoretical foundation for the proposed framework, the validation of which through actual field trials is a scope for future work. | ||
| Key Words | ||
| data anomaly detection; deep neural network compression; edge intelligence; network pruning; structural health monitoring | ||
| Address | ||
| "(1) Tarutal Ghosh Mondal: Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, 65401, MO, United States; (2) Jau-Yu Chou: Department of Civil Engineering, National Taiwan University, Taipei, 10617, Taiwan; (3) Yuguang Fu: School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore; (4) Jianxiao Mao: Key Laboratory of C&PC Structures of Ministry of Education, Southeast University, 211189, China." | ||