Abstract The use of unconventional design has become a norm for mission-specific underwater autonomous craft. Geometrical characteristics and drag optimized shapes single-hulled vehicles are known since 1970s few significant improvements have been possible then. These mostly related to the efficiency wake adapted propeller, positioned at stern in hull. In novel effort, when propeller is integra...

blind source separation technique separates mixed signals blindly without any information on the mixing system. in this paper, we have used two evolutionary algorithms, namely, genetic algorithm and particle swarm optimization for blind source separation. in these techniques a novel fitness function that is based on the mutual information and high order statistics is proposed. in order to evalu...

Composite propellers offer high damping characteristics and corrosion resistance when compared with metal propellers. But the design of a hybrid composite propeller with the same strength of metal propeller is the critical task. For this purpose, the present paper focusses on fluid-structure interaction analysis of hybrid composite propeller with Carbon/Epoxy, R-Glass/Epoxy and S2-Glass/Epoxy t...

In this paper, a new approach is proposed for the optimum design of single-phase induction motor. By using the classical design equations and the evolutionary algorithms such as Genetic Algorithms (GA), Particle Swarm Optimization (PSO) and Modified Particle Swarm Optimization (MPSO), a Single Phase Induction Motor (SPIM) was designed with the maximum efficiency. The Finite Element Method (FEM)...

E-learning model is examined of three major dimensions. And each dimension has a range of indicators that is effective in optimization and modeling, in many optimization problems in the modeling, target function or constraints may change over time that as a result optimization of these problems can also be changed. If any of these undetermined events be considered in the optimization process, t...

‎this paper proposes a multi-supplier multi-product inventory model in which the suppliers have unlimited production capacity, allow delayed payment, and offer either an all-unit or incremental discount. the retailer can delay payment until after they have sold all the units of the purchased product. the retailer’s warehouse is limited, but the surplus can be stored in a rented warehouse at a...

This paper presents numerical analyses of aerodynamics and aeroacoustics ducted/un-ducted propellers based on high-fidelity CFD methods, adjoint-based aerodynamic performance optimisation the ducted propeller by altering duct blade shapes. Ducted experiments NASA are chosen for validation used as baseline designs. High-fidelity simulations performed using in-house solver HMB3. The is analysed s...

Modal decomposition techniques, flow field, and spectral analysis are employed to investigate the wake dynamics destabilization mechanisms of a four-bladed marine propeller with or without nozzle. Numerical simulations conducted using delayed detached eddy simulation model for arbitrary mesh interface method blade rotation. The presence nozzle significantly reduces wake's streamwise velocity, d...

E-learning model is examined of three major dimensions. And each dimension has a range of indicators that is effective in optimization and modeling, in many optimization problems in the modeling, target function or constraints may change over time that as a result optimization of these problems can also be changed. If any of these undetermined events be considered in the optimization process, t...