Rapid advancement in sensing, communication, and mobile technologies brings a new wave of Industrial Internet of Things (IIoT). IIoT integrates a large number of sensors for smart and connected monitoring of machine conditions. Sensor observations contain rich information on operational signatures of machines, thereby providing a great opportunity for machine condition monitoring and control. However, realizing the full potential of IIoT depends to a great extent on the development of new methodologies using big data analytics. This paper presents a new methodology for large-scale IIoT machine information processing, network modeling, condition monitoring, and fault diagnosis. First, we introduce a dynamic warping algorithm to characterize the dissimilarity of machine signatures (e.g., power profiles during operations). Second, we develop a stochastic network embedding algorithm to construct a large-scale network of IIoT machines, in which the dissimilarity between machine signatures is preserved in the network node-to-node distance. When the machine condition varies, the location of the corresponding network node changes accordingly. As such, node locations will reveal diagnostic information about machine conditions. However, the network embedding algorithm is computationally expensive in the presence of large amounts of IIoT-enabled machines. Therefore, we further develop a parallel computing scheme that harnesses the power of multiple processors for efficient network modeling of large-scale IIoT-enabled machines. Experimental results show that the developed algorithm efficiently and effectively characterizes the variations of signatures in both cycle-to-cycle and machine-to-machine scales. This new approach shows strong potentials for optimal machine scheduling and maintenance in the context of large-scale IIoT.
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Hardware and Architecture
- Industrial and Manufacturing Engineering