Design And Evaluation Of Interface Of Ship Dynamic Positioning System Based On Cognitive Decision Mechanism

With the rise of marine economy,the scope of marine resource development is moving from offshore to deep sea.Compared with the traditional anchoring methods,dynamic positioning vessels have great advantages during deep-sea positioning operations.On the one hand,thanks to the development of automation technology,operators only need to monitor system information and make key decisions when interact with dynamic positioning system.On the other hand,the digital displays and interfaces of dynamic positioning system contain complex information from multiple coupled subsystems,so operators usually have high cognitive workload and may have difficulty in decision making.Especially when unforeseen scenarios occur,operators need to reason causally based on the mechanism of the system as well as the current state of it,which increases the failure rate of decision-making.Therefore,designing the interface design based on operator cognitive decision making mechanisms can improve operators’ understanding of system mechanisms and the level of situational awareness of system states by balancing operator cognitive load,and assist their control decision-making.This paper firstly analyzes the process and classification of operators decision-making behaviors based on the basic theory of operator cognitive decision-making mechanism,and clarifies the important role of information processing shortcuts.The design principles of decision-aided interfaces are then summarized based on two key factors that support operators’ reasoning and decision-making,namely,operators’ intellectual understanding of system mechanisms and situational awareness of system states.Secondly,methods to extract and present information requirements of the software interfaces of ship dynamic positioning system are proposed based on the cognitive decision theory and principles of designing interfaces that support decision-making.The working domain analysis of the ship dynamic positioning system is used to clarify the information variable requirements and hierarchical variable relationships of the system interface design.The situation awareness information requirements is summarizes using the user interview method.Then,the information graphic design methods is analyzed.Again,the layout design of the interfaces is carried out on the basis of clarifying the basic operation tasks of the system,and the information requirements of the system interface were summarized into functional views,after which the detailed design of the system interface and the high-fidelity interaction prototype design were completed.Finally,the interface evaluation methods of the ship dynamic positioning system is developed.The optimized scheme is evaluated from the dimensions of cognitive workload,operational performance and situation awareness using a combination of subjective and objective methods and finally verifies the effectiveness of the optimization scheme.