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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik ITS IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Jurnal Kelautan Nasional Wave: Jurnal Ilmiah Teknologi Maritim Archipelago Engineering Makara Journal of Technology Sewagati
I Ketut Aria Pria Utama
Jurusan Teknik Perkapalan Institut Teknologi Sepuluh Nopember
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Journal : Makara Journal of Technology

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Shaft Torsional Vibration Response of Vertical Axis Ocean Current Turbine Model Due to Torque Excitation Husodo, Adi Wirawan; Utama, I Ketut Aria Pria; Ariana, I Made
Makara Journal of Technology Vol. 14, No. 2
Publisher : UI Scholars Hub

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Shaft Torsional Vibration Response of Vertical Axis Ocean Current Turbine Model Due to Torque Excitation. The current research aimed to study the torsional vibration response of Vertical Axis Ocean Current Turbine due to randomly torque excitation pattern, owing to the variety of ocean current velocity. The turbine model is composed of 3 aluminum blades of NACA 0018 connected to steel shaft. Turbine dimensions are 10 cm of chord, 1.8 cm of chamber and 100 cm of span. The variation of ocean current velocity is 0.5 m/s, 1.0 m/s, 1.5 m/s, 2.0 m/s, 2.5 m/s and 3.0 m/s. The Model has 2 degree of freedom which is described into two 2nd order differential equations. The eigenvalue solution yields the model’s natural frequencies; 201,38 rad/s and 457.91 rad/s. Fourier series is used to define the equation of torsional excitation, whilst the vibration equation is solved using Laplace Transform. According to analysis, there is no resonance occur. That because of the system’s natural frequencies is diverse to the magnitude of excitation frequencies. Model will be statically twisted first before vibrated. The response will be transient first then constantly steady. Furthermore, the bigger torque excitation will cause the bigger angular displacement as well the amplitude.
An Investigation Into the Resistance/Powering and Seakeeping Characteristics of River Catamaran and Trimarana Murdijanto, Murdijanto; Utama, I Ketut Aria Pria; Jamaluddin, Andi
Makara Journal of Technology Vol. 15, No. 1
Publisher : UI Scholars Hub

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The increase of fuel price has caused fleet operational and shipping business to be in danger situation. The fuel consumption of a ship is influenced by ship volume or wetted area which contributes directly to the increase of ship resistance and the size of main engine. In order to find out the appropriate answers, a series of investigation into river transportation using monohull, catamaran and trimaran types of vessel was carried out. The work focused on the estimation of total resistance and powering as well as seakeeping characteristics and carried out experimentally using tank test and numerically using a ship design software (Maxsurf). It was found out that the catamaran and trimaran could have less resistance and hence power compared to monohull of similar displacement. The seakeeping characteristics of the multihull vessels were also comparable with those of the monohull. This is a good indication that river catamaran/trimaran is an efficient and comfortable vessel. If a prototype or real vessel is developed, it can be a very efficient ship as well as a ship with high safety standard.
Co-Authors Adi Wirawan Husodo Ahmad Charizzaka Andi Jamaluddin Andrew Gibson Aries Sulisetyono Aryo Tri Septya Nugraha Bagiyo Suwasono Baital, Muh. Sawal Dian Purnamasari Dian Purnamasari Dita Adhelia Putri Endah Suwarni Endah Suwarni Fajar Adi Pratama Garry Raditya Putra Giles Anthony Thomas Hasanudin Hasanudin Hery Indria Dwi Puspita I Ketut Suastika I Made Ariana I. K. Suastika Kurniawati, Fiqih Dwi M. Zain Fajar Ramadhani M.Arief Hamdani Muhammad Hafiz Nurwahyu Aliffrananda Murdijanto Murdijanto Nasirudin, Ahmad Noor Muhammad Ridha Nugroho, Ardi Nurhadi Nurhadi Pradipta Rahman Hakim Rahmat Diko Edfi Richard Benny Luhulima Robi Wahyudi Rosa, Andrea Grech La Setyawan, Dony Sri Rejeki Wahyu Pribadi Sugeng Riyadi Sutiyo Sutiyo Sutiyo, S Teguh Putranto Zhafir Tri Setiabudi Putra