Parameter identification of ship longitudinal motions using continuous ant colony algorithm with period searching

A continuous ant colony algorithm with period searching(PSCACA) is introduced.It was suc-cessfully applied in solving the problem of hydrodynamic parameter identification of ship longitudinal mo-tions.Firstly,the problems of parameter identification of ship longitudinal motions are converted to nonlin-ear optimization problems in parameter space,and then,in the solving of the optimization problem,the pa-rameters are dynamic grouped in the light of the importance of each parameter respectively.Furthermore,the ranges of the parameter are fixed and the search is practiced with high accuracy in these ranges.The result of hydrodynamic parameter identification of ship shows that the algorithm can recognize the hydro-dynamic parameter of ship longitudinal motions in a satisfied precision.And the algorithm is proved to be effective.