Indonesia as a country that often experiences tsunami disasters needs to have an early warning system against tsunami disasters. This system can use various existing technologies, one of which is the tsunami buoy system. The new tsunami buoy system does not use the natural mooring system but uses the wave glider system. This paper discusses the structural strength of the surface floater of wave glider using Eva Foam and Fiberglass material for skin and Alluminium material for frame and kell. The surface floater using 16 pieces for frame and 1 piece for keel. Enviromental loads is use in this paper like hydrodynamics load and weight load. The results from this paper is material from Eva Foam has a maximum principle stress is 12693 Pa and shear stress is 6114.6 Pa. For material from Fiberglass has maximum principle stress is 11.875 Pa and shear stress is 6076.3 Pa. Safety factor (SF) from maximum principle stress and shear stress for Eva Foams is up to 6x and SF for maximum principle and shear stress for Fiberglass is up to 26x. Conclusions for this paper is the desain for surface floater of wave glider it can be operated in the sea with draugh 0.18 m.
Computational Fluid Dynamics (CFD) is a tool for solving the basic problems of equations for model flow motion. The CFD application can be used to predict the magnitude of the ship's resistance which is related to the engine power needed to move the ship. Benchmarking is the process of comparing different methods, procedures, and physical models to provide a common basis for the validation of numerical methods. This study simulates the resistance test on the LHI 007 benchmark ship model using FINE™/Marine with speed ranges 1.63 m/s – 2.47 m/s at a temperature of 27°C. The purpose of this research is to complete the simulation approach and numerical uncertainty for the previous study. By adding a time step component to the verification and validation of the uncertainty analysis, the error value gets smaller than the validation value for various speeds 1.63 m/s, 1.8 m/s, 1.91 m/s and 2.02 m/s. It shows that validation was achieved.
The high cost of certification and the low pass percentage in welding certification are common issues for beginner welders. The use of Augmented Reality (AR) technology is expected to solve these issues. The results of the penetrant, bending, and tensile tests showed that the welder who had used the AR welding machine produced better welding specimens than before they practiced using the AR welding machine. The penetrant test after beginner welder practiced using the AR welding machine produces rounded defects with a defect size of 1,44 mm (accepted by ASME Section V), whereas before they practiced using the AR welding machine it produces defects that cannot be accepted by the criteria. The maximum open discontinuity length in the bending test on the welded specimen after welder practiced using the AR welding machine is 2,90 mm (accepted by ASME Section IX), whereas the bending test before welder practiced using the AR welding machine is not accepted by the citeria. The tensile test results after welder practiced using the AR welding machine were 410,00 and 455,66 N/mm2 for the maximum tensile stress. This value exceeds the minimum tensile strength of SA-36 carbon steel, which is 400 N/mm2. When compared to the specimen before the welder practiced using the AR welding machine, the modulus of elasticity produced after the welder practiced using the AR welding machine is also smaller, indicating that the material has better elasticity. Based on the results of the tests, it can be seen that the AR welding machine can be used for the implementation of competency certification because the quality of the weld results is better, there are fewer risks (sparks, eye irritation, and burns), and the use of welding consumables is reduced
Kinerja sistem tambat Kapal Isap Produksi (KIP) timah sangat dipengaruhi oleh tension dari tali tambat dan offset yang dialami oleh struktur. Analisis pada sistem tambat untuk penelitian ini dilakukan dengan variasi sudut sebar tali tambat (30°, 45°, dan 60°) dan variasi panjang tali yaitu dengan diperpendek 0.2 m dan diperpanjang 0.2 m. Hasil yang diperoleh dari analisis yang dilakukan adalah respon gerak dari KIP timah dalam gerakan vertikal dan horizontal sudah cukup bagus. Variasi sudut sebar tali 30° menghasilkan tension maksimum paling baik, dengan tension maksimum sebesar 451.35 kN akibat arah pembebanan 90° di fairlead. Pada variasi panjang tali, adanya penambahan panjang 0.2 m, sudut sebar 30°, arah pembebanan 90° di fairlead merupakan yang terbaik dengan tension maksimum sebesar 449.30 kN. Tension maksimum yang dihasilkan masih dalam batas yang diijinkan API RP 2SK. Offset maksimum yang dihasilkan juga masih dalam batas aman yang diijinkan oleh API RP 16Q, dengan offset sumbu-x terbesar 0.228 m akibat arah pembebanan 135° dan sumbu-y sebesar 0.566 m akibat arah pembebanan 90°.
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