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International Journal of Hydromechatronics (2 papers in press)
The effects of particle swarm optimization and genetic algorithm on ANN results in predicting pile bearing capacity by Bhatawdekar Ramesh Murlidhar, Rabindra Kumar Sinha, Edy Tonnizam Mohamad, Rajesh Sonkar, Majid Khorami Abstract: The current study has attempted to build 2 hybrid intelligent models for pile bearing capacity prediction Presenting the influence of genetic algorithm (GA) and particle swarm optimization (PSO) on a pre-developed artificial neural network (ANN), 2 hybrid models i e , GA-ANN and PSO-ANN have been built to pile bearing capacity prediction Then, the best predictive models of GA-ANN and PSO-ANN were selected based on 3 performance indices, i.e, R2, RMSE and VAF. Respectively, R2 variables as (0.975 and 0.988) and (0.985 and 0.993) have been gained to train and test of datasets in GA-ANN and PSO-ANN. The outcomes have proved both hybrid methods as capable with highly accurate bearing capacity prediction, however, PSO-ANN predictive model is more applicable in terms of performance capacity and it can be introduced as a new technique in this field. Keywords: Piling; Ultimate bearing capacity; Genetic algorithm; Particle swarm optimization; Artificial neural network. DOI: 10.1504/IJHM.2019.10023991
Numerical modeling of underwater structural impact damage problems based on the material point method by Jingxin Ma Abstract: Based on the material point method (MPM), the numerical modelling of the steel plate structure under the near-field contact explosion in underwater was studied. The equations of state, constitutive equation and failure mode are used to analyse the destruction and failure process of materials. Numerical studies analyse the impact of explosive loads on underwater steel plates under different operating conditions, and calculate the distribution of pressure and particles. The results show that the steel plate will produce a large plastic deformation and eventually form a punch inge, and the existence of steel plate medium has obviously helped the whole system to weaken the shock wave, which can reduce the damage by about 20%. It can serve as a useful reference for the protection of underwater systems. Keywords: Failure mechanism; Underwater explosion; Contact explosion; Material Point Method.