A numerical model is developed to compare the performances of mooring materials for a gravity cage system. At first, small-scale built and it validated by previous experiments. With same method, full-scale study performance different materials. Link elements are used wire ropes consider weight, nonlinear spring composite fibre stiffness. High-tenacity polyester multifilament has best performance. It can reduce average value amplitude forces, which also contributes reducing stress...

Experiments are conducted in a flume to study the mooring forces and motions of gravity cage regular waves. Cage models built with hollow pipes nets. Mooring including surge, heave pitch measured. With increase wavelength, force, surge while rate gradually slows down until stops. On other hand, under short waves, increases decrease wavelength. In addition, does not finish cycle motion before next peak arrives, which leads reduction all directions. observation overtopping, it can be concluded...

The mooring force in a fish cage array subjected to currents and waves is investigated using the finite element method. Firstly, numerical model of with six gravity cages built by Ansys/APDL. Collars bottom rings are simulated pipe beam elements while rest structure link elements, including net cables. Thus, weight hydrodynamic load on cables can be considered. initial shape ropes calculated based dynamics. Since each component slender array, Morison equation used calculate load. Secondly,...

A numerical model associated with wave–current interactions a moored flexible cylindrical cage was developed based on the finite element method. An analytical formulated under linearised wave theory and small structural response, semi-analytical solution obtained using Fourier Bessel series least squares approximation method, along matching technique. The results from analysis of horizontal displacements for different design parameters uniform current were compared solutions. It seen that...

Experiments are conducted in a flume to study the motions and wake behind circular gravity cage under linear waves. The model is built with high-density polyethylene pipes nylon nets. Wave heights periods measured by wave gauges both upstream downstream. Supports used above fix connect model. It found that behaves differently short long relative motion between floating water surface large can be observed clearly how waves pass over collar. On other hand, collar just rides on without apparent...

Vertical tubes are proposed to connect the collar and bottom ring address significant deformation of gravity cage nets caused by currents waves. The goal is minimize volume loss cages, which reduces habitat available for fish. This study analyses effect vertical on drag forces using numerical experimental methods. Tests conducted in a towing tank measure validate model that employs beam link elements simulate behaviour. differences between simulations experiments discussed. Cages with thin...

Hyperspectral images (HSIs) encapsulate a vast amount of information due to their expansive size and high number channel dimensions. However, they are insufficiently utilized for ineffective feature extraction, particularly regions with few samples predominant edges. To fully leverage the spatial–spectral features HSIs, dual-branch multi-scale residual attention network (MSRAN) that integrates extraction mechanisms is proposed. MSRAN independently extracts spatial spectral through dual...

The volume of a gravity cage is greatly reduced under current due to the flexible structure, which affects growth and health fish. Thus, an accurate assessment essential determine number fishes in cage. In this study, firstly, numerical model was built study reduction cages net deformation when subjected uniform flow. remaining calculated compared with earlier experiments. Even though flow velocity reductions were considered according data from previous experiments, differences between...

The construction quality control of hull blocks is great significance for shipbuilding. total station device predominantly employed in traditional applications, but suffers from long measurement time, high labor intensity and scarcity data points. In this paper, the Terrestrial Laser Scanning (TLS) utilized to obtain an efficient accurate comprehensive information blocks. To address registration problem which most important issue comparing point cloud design model, automatic approach...

AbstractThe paper presents a method to estimate the displacement of neutral axis during loading damaged ship hull subjected bending moment. The uses load–end shortening relationship obtained from numerical residual strength calculations double-bottom structure with fixed location and establishes force equilibrium over whole transverse section ship. set estimated locations axes allows defining new load condition induce moment on double bottom at higher strain rate. is compared previous intact...

Filter systems are widely used in petrochemical plants for removing solid impurities from hydrocarbon oils. The backwash is the cleaning process to remove on sieves of filters without a need interrupt operation entire system. This paper presents case study based actual project filter system plant, demonstrate significant effect vibration structural integrity piping. induced had led fatigue failure pipes connecting A preliminary assessment suggested that vibrations caused by backwashing...