Trans RINA, Vol 161, Part A4, Intl J Maritime Eng, Oct-Dec 2019
Wei et al. (2015) has developed a minimum fuel consumption based solution model to solve collision avoidance problems at sea. In this study, problem solving has been achieved by using the Cat Swarm Biological Algorithm (CSBA). The simulation tests have showed that the model is effective and applicable.
Lazarowska (2015) has presented a swarm intelligence application using Ant Colony Optimization (ACO) to form a decision support system. The capability of the system contains collision avoidance path planning in restricted waters as well as open sea. In this study, polygonal ship domain has been used instead of circular which is commonly used and static objects have also been taken into account to generate collision-free trajectories. The other ACO based method has been introduced by Tsou and Hsueh (2010). The main difference between these two studies is solution construction. The former one takes into account all target ships (TSs) in the vicinity at the same time to construct a collision avoidance path. The latter one, however, the TS with the highest collision risk is first to be disposed. The collision avoidance calculation has been performed with regard to collision risk degree of the TSs.
On the other hand, Lazarowska (2017) has also presented a deterministic approach, called the Trajectory Base Algorithm Decision Support System (TBADSS), to generate a decision support system providing an optimal and safe trajectory for ships. The system has been formed to solve the trajectory planning problem for complex environment with dynamic and static obstacles. The TBADSS composes of four submodules as Data Input Module, Database Module, TBA Module and Solution Output Module. The database constituting all possible solution trajectory has been created and the TBADSS aims to find the optimal one. The deterministic algorithm has been compared with the ACO-based method. The TBA- based approach provides better performance concerning lengths of path and execution time.
Nguyen et al. (2012) has developed a Bacteria Foraging Optimization based automatic tool for navigators by determining the optimal collision avoidance strategy. The proposed algorithm has been applied for various scenarios to confirm its efficiency. The scenario implementations have showed that the algorithm is robust, efficient and applicable.
Naeem et al. (2012) has proposed a COLREGs-based collision avoidance strategy for USV. The developed system is a reactive path planning algorithm providing feedback to autopilot of USV or navigator of manned ship for altering the course. A* algorithm and Line-of-Sight (LOS) algorithm has been used to generate a safe trajectory and both could produce a realistic trajectory.
Lisowski (2012) has introduced a game control process in marine navigation. In this study, multi-step matrix and multi-stage positional, cooperative and non-cooperative,
optimal and game control algorithms in encounter situation has been implemented. The simulation of control game algorithm has revealed that the model of game theory for the optimal manoeuvring has made it possible to form the safe route of the OS passing through a large number of TSs.
Tam and Bucknall (2013) has developed a deterministic based algorithm to generate a practical and COLREGs- complaint navigation trajectory for ships with collision risks. The algorithm structure has been categorized into two main subdivisions. The first subdivision is to determine the collision risk for each target in the vicinity. The second subdivision comprises the calculation of avoidance manoeuvre to overcome the collision risk. It is emphasized in the study that the algorithm is based on a deterministic form so, it can produce the exact and unique solution in every execution.
Xu (2014) has presented a Danger Immune Algorithm- based method to accomplish ship collision avoidance route optimization regarding economy and safety. In this study, ship domain and ship arena have been utilized to evaluate the collision risk to calculate the fitness function. The simulation tests have revealed that the algorithm is feasible and valid.
Zhang et al. (2015) have studied on a multi-ship collision avoidance decision support using Linear Extension Algorithm under the requirements of COLREGs. The model has been developed to form a safe path for the OS to keep her clearance from all the TSs in the navigation area. The study concludes that the speed changing to avoid collision gives better performance than course alteration for encounter situations with small crossing angle while course alteration performs better for large crossing angle.
Johansen et al. (2016) has described a model predictive control based approach for collision avoidance system for ship. A set of control behaviours for an autonomous ship have been constituted by diversifying two parameters: course command and propulsion command. Simulation experiment has showed that the model can be set to determine control behaviours for various cases and effectively manages complex situations with multiple obstacles.
Wang et al. (2017) has proposed a finite-time observer based accurate tracking control plan for path tracking of a marine vehicle with complex uncertainties. The simulation studies carried out in the study have showed that the marine vehicle system under the thoroughly uncertain dynamics conditions can be properly tracked regarding velocity and position.
Kim et al. (2017) has developed a Distributed Stochastic Search Algorithm (DSSA)-based method which enables each ship to alter her course in a stochastic manner according to the intentions of the TSs. The experimental test results have showed that the DSSA yields better
©2019: The Royal Institution of Naval Architects
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