Research On Scheduling Algorithm Of Ship Engine Room Integrated Monitoring Network

Along with the development of embedded technology and computer network technology,the latest engine room automation system has achieved put all equipment's detection,alarm and control in a system,called the integrated automatic control system.With the improvement of automation,higher requirements are put forward for the allocation of network resource.This dissertation focuses on how to improve the network performance from the perspective of collaborative design of control and scheduling in view of the determined network structure.Analyzing the shortcomings of existing scheduling algorithms,an improved fuzzy scheduling algorithm based on feedback is proposed.Adding a scheduler in the data acquisition node to achieve the scheme.Based on the nonlinear characteristics of fuzzy algorithm,the message transmission delay and the control performance of the system are considered to configure the priority.Compared with the EDF under the same network environment,the result shows that the algorithm can improve the real-time of message and the control effect of system.Ulteriorly,in the process of system operation,the number of non-periodic messages may suddenly increase,means the available bandwidth of each node is time-varying.This dissertation presenting a flexible scheme for cooperative scheduling of priority and variable sampling period.The allocation of bandwidth resources is on the basis of the non-cooperative game model in game theory,the optimal sampling period of the node is calculated based on Nash equilibrium point.The sampling period is allocated through the cooperative scheduling center.The simulation results show that the scheme can allocate the bandwidth resources more reasonably when the network bandwidth changes.On the basis of theoretical analysis and system simulation,an experimental platform is established to meet the testing requirements of networked systems.The networking experiment is completed under the framework of CANopen maritime electronic protocol,and the effectiveness of feedback-based improved fuzzy scheduling algorithm and collaborative scheduling scheme are verified.