Research On Mobile Charging For Avoidance Of Actuator Node Failure In WSANs

Wireless Sensor and Actuator Networks(WSANs)are composed of a large number of sensor nodes and a small number of actuator nodes.The sensor nodes are usually stationary,while the actuator nodes are usually mobile in the networks.Compared with the sensor nodes,the actuator nodes have a large amount of energy and need a long time to charge.So the existence of the actuator nodes brings new challenges to the charging of WSANs.Although the energy replenishment mechanism of Wireless Sensor Networks(WSNs)has been widely researched,it is not applicable to WSANs.Therefore,this paper takes WSANs energy replenishment mechanism as the research background and proposes charging strategy applicable to WSANs aiming at the charging challenges brought by actuator nodes.This paper firstly introduces the research status of WSANs,wireless charging technology and describes the existing WSANs energy supplement strategies.Secondly,aiming at the charging challenge brought by the addition of the actuator nodes in WSANs,this paper proposes a charging framework to avoid the failure of actuator nodes.This framework fully considers the remaining energy of the nodes,the distance from the mobile charging equipment and the dynamic energy consumption of the nodes when planning the charging path.A large number of simulation experiments are compared with the existing three algorithms,the results show that the framework has obvious advantages in node failure rate,charging cost and average charging delay.The innovation points of this paper are as follows:(1)The energy consumption of nodes is highly dynamic because of the influence of surrounding environment,perceived tasks and other factors.In this paper,the current energy consumption rate of nodes is calculated,which have practical significance to the realization of reasonable charging strategy.(2)In this paper,a charging framework is designed on the basis of dynamic consumption rate.This framework effectively avoids the failure of the actuator nodes,and solves the problem of a large number of dead sensor nodes caused by the long charging time of the actuator nodes.Meanwhile this framework reduces the failure rate of the sensor nodes.In addition,this framework fully considers the distance between the nodes and the Mobile Vehicle(MV),carefully plans the next chargingnode,and reduces the network charging cost.Finally,based on the mobility of the actuators,this paper effectively solves the tracking and positioning problem of the actuator nodes by the node movement model.(3)This paper carries out simulation experimental based on failure rate of sensor nodes,charging cost and average charging delay.This paper analyzes the influence of each parameter on the experimental results and compares with the existing three charging strategies FCFS,NJNP and FEMER.The results fully prove the advantages of the charging framework proposed in this paper.