In this study, we aim to investigate the fault prediction for watercraft equipment by using grey relational analysis. At first, the healthy degree model of watercraft equipment is proposed, and then two main theorems are derived to determine the health condition criteria for equipment. Lastly, the relevant simulation results are provided to verify the validity and accuracy of the healthy degree model. Current results can be helpful to effectively design the supporting mode of watercraft equipment and realize the transformation of watercraft equipment support from planned maintenance to predictive maintenance.

This paper settles the nonlinear merging consensus for multi-agent systems on a directed and weighted signed network. A novel nonlinear merging control protocol is proposed to drive the states of all agents to arrive at the same state. To be consistent with the reality, the interactions among agents can be either cooperative or competitive and the information flow is considered to be directed. Particularly, the protocol can still ensure the states of all agents to reach an agreement, even though the corresponding directed network is not strongly connected. Besides, to guarantee the efficiency of multi-agent systems, the convergence rate of agents can be sped up by adjusting the parameter of the protocol. Finally, the theoretical analysis and simulation results are provided to verify the effectiveness of this protocol. The current results are instructive for us to comprehend and design an efficient consensus protocol within multi-agent systems. INDEX TERMS Nonlinear merging consensus, multi-agent systems, signed graph, weighted and directed network.

Product configuration system, being a knowledge intensive system, plays an important role in order to realize Mass Customization. The Platformbased generic product configuration tool(PB-GPCT) being developed by Institute of Design for Innovation, Hebei University of Technology. PB-GPCT is a structure-based and domain independent configuration tool. For the realization of PB-GPCT, UML is chosen to construct the configuration model and OCL(Object Constraint Language) to express constraints. In order to manage the constraints of product easily, the approach of checking consistency of configuration model is presented. The theory of constraints hierarchies is introduced into the system of PB-GPCT in order to express customer requirements of different levels.

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