Wasis Dwi Aryawan - Academia.edu (original) (raw)

Papers by Wasis Dwi Aryawan

International Journal of Technology

Nowadays, the issue of energy efficiency in the maritime transportation sector has been strongly ... more Nowadays, the issue of energy efficiency in the maritime transportation sector has been strongly associated with the decreasing use of fossil energy and greenhouse gas emissions. Crew boats are one of the ship modes which consumes a lot of fuel in maritime transportation. This affects the number of exhaust gases released into the atmosphere. A study into the estimation of crew boat resistance was carried out experimentally using a towing tank, numerically using a CFD methodology, and then compared with Savitsky's method. Measurements were taken in calm waters under even keel and trim scenarios, considering load variation had been adjusted for. Determining the correct load position affected the LCG (Longitudinal Center of Gravity) and VCG (Vertical Center of Gravity) parameters, affected trim, and decreased crew boat resistance. Overall results showed that the experimental test, CFD method, and the empirical estimation from Savitsky were in good agreement with average errors up to 3%. The calculation results demonstrated that trim had a greater influence on decreasing resistance up to 3.062% than even keel position. Furthermore, the shifting of LCG had a more significant effect than that of VCG in the context of resistance changes.

Proceedings of the 4th International Conference on Marine Technology, 2019

Jurnal Teknik ITS, 2019

Pesatnya perkembangan industri di Indonesia masih menyisakan beberapa daerah terpencil dalam kead... more Pesatnya perkembangan industri di Indonesia masih menyisakan beberapa daerah terpencil dalam keadaan belum teraliri listrik, salah satunya yaitu Kabupaten Kepulauan Selayar, Sulawesi Selatan. Menanggapi hal tersebut, penggunaan energi terbarukan; energi panas matahari dapat dijadikan solusi kurangnya pemerataan pembangunan pembangkit listrik pada daerah terpencil tersebut. Dengan memanfaatkan kondisi geografis Kepulauan Selayar yang dikelilingi laut, hal tersebut dapat didesain Pembangkit Listrik Tenaga Surya Apung (PLTSA) yang terdiri dari barge dengan lambung katamaran sebagai media apung dari panel surya dan inverter sehingga nantinya satu PLTSA dapat memenuhi kebutuhan listrik pada beberapa kecamatan walaupun berada di pulau yang berbeda. Dengan menggunakan grid-tie system, pasokan listrik yang dihasilkan dapat langsung dialirkan ke grid PLN daerah setempat. Berdasarkan informasi dan kebutuhan listrik di Kabupaten Kepulauan Selayar, dibutuhkan sekitar 4 barge dengan 2410 unit panel surya dan 4 inverter pada tiap kapalnya untuk memenuhi kebutuhan daya listrik per hari sebesar 1.849.362,051 W. Ukuran utama kapal yang didapatkan adalah L = 164 m, B = 42 m, H = 4,2 m, T = 1,2 m. Dari ukuran utama kapal tersebut, didapatkan perhitungan analisis teknis, analisis ekonomis, analisis sensitivitas, serta gambar Lines Plan, General Arrangement, dan 3D Modeling.

Jurnal Teknik ITS, 2019

Indonesia merupakan negara maritim yang terbesar di dunia dengan 80% dari wilayahnya yang berupa ... more Indonesia merupakan negara maritim yang terbesar di dunia dengan 80% dari wilayahnya yang berupa lautan. Hal ini menyebabkan susahnya pengawasan terhadap keamanan dan kedaulatan wilayah NKRI khususnya dalam sektor maritime. Oleh karena itu dibutuhkan desain kosep kapal cepat katamaran yang baik dan cepat tanggap sebagai alusista perang dan pengamanan wilayah maritim Indonesia. Tujuan dari desain kapal Tank Boat ini adalah 1. menentukan operational requirements kapal perang serbu Catamaran Tank Boat dengan Turbojet, 2. Memperoleh ukuran utama kapal perang serbu Catamaran Tank Boat dengan Turbojet, 3. Mendapatkan lines plan dan rencana umum kapal perang serbu Catamaran Tank Boat dengan Turbojet, 4. Mendesain layout awal rencana umum dan model 3D kapal perang serbu Catamaran Tank Boat dengan Turbojet. Dalam proses desain awal kapal perang ini, dilakukan penentuan operational requirement kapal dan ukuran utama kapal yang diperoleh dari metode parent ship dengan ukuran utama LOA=18 m, B...

IOP Conference Series: Materials Science and Engineering, 2021

Ship maneuvering is defined as the inherent capability of a vessel to turn its path based on the ... more Ship maneuvering is defined as the inherent capability of a vessel to turn its path based on the hydrodynamics principles. The maneuvering performance becomes important to the safety of navigation when a ship operates. In case of vessel turning motion, International Maritime Organization (IMO) requires the maximum tactical diameter is five times of the ship lengths. Tactical diameter is the distance travelled by the ship’s center of gravity in a parallel direction to the ship’s initial path. In this paper, semi-empirical approach proposed by Clarke (1983) was used to obtain the first derivative of hydrodynamics equation. After that, the maneuvering performance was calculated using Son and Nomoto’s mathematical model (1981). Based on IMO regulations, the calculation of tactical diameter was conducted with 35° of rudder position. The calculation and analysis of tactical diameter was carried out according to relevant procedure of the ship maneuvering provided by IMO. The calculation re...

CFD Letters, 2022

Energy efficiency and environmental sustainability are important aspects in ship design and opera... more Energy efficiency and environmental sustainability are important aspects in ship design and operation. Hull-shape optimization, hull cleaning and coating, and the use of appendages are, among others, well-known efforts to reduce ship fuel consumption. Regarding energy efficiency and environmental sustainability, it is possible to effectively reduce the resistance of an existing catamaran by retrofitting a foil system to it. In this study, a foil system is designed and retrofitted to a catamaran to reduce its total resistance. Reynolds-averaged Navier-Stokes simulations, utilizing k-w SST turbulence model, were performed to study the effects of the foil system on the vessel’s total resistance. Free surface effects were modelled, i.e., the generation of waves due to the vessel’s movement on the water surface. The foil system affects the wetted surface area, running sinkage and trim, and the wave pattern generated by the vessel, which ultimately affect the vessel’s total resistance. At...

IOP Conference Series: Materials Science and Engineering, 2021

Search and rescue operations, especially in ship accidents, require speed and reliability from th... more Search and rescue operations, especially in ship accidents, require speed and reliability from the rescue vessels in facing the challenges of extreme weather and sea waves. A rescue boat hydrodynamic performance study is very important to do to determine the ship’s ability to withstand dangerous conditions while operating. Therefore, a rescue boat design is needed that is capable of high acceleration and can penetrate various extreme sea condition. Three rescue boat hull models have been developed to obtain the hull model with the best seakeeping performance. A numerical arrangement based on computational fluid dynamics (CFD) techniques is used to predict seakeeping behaviour from three rescue boat hull model in wave. Three-dimensional diffraction panel method uses as a CFD solver method to predict the seakeeping performance of rescue boat high-speed operation in wave. From the study results, it was found that the first rescue boat hull model had a good seakeeping performance compar...

Jurnal Teknik ITS, 2017

Biawak terletak di laut jawa di Kabupaten Indramayu Jawa Barat di sebelah utara semenanjung Indra... more Biawak terletak di laut jawa di Kabupaten Indramayu Jawa Barat di sebelah utara semenanjung Indramayu seitar 40 kilometer dari pantai utara Indramayu. Pulau biawak adalah salah satu tempat pariwisata yang menarik untuk dikunjungi, daratan seluas 120 hektare kaya akan dengan tanaman bakau, pesona laut yang masih 'perawan', disini terdapat mercusuar juga yang masih berfungsi yang didirikan sejak zaman Belanda dan terdapat juga ikon pulau ini yaitu hewan varanus salvator atau biawak yang sering kita sebut dan wisata lainnya. Sehingga sekarang banyak wisatawan dari daerah luar Kabupaten Indramayu seperti Jakarta, Cirebon dan bahkan luar Jawa Barat yang menuju Pulau Biawak setiap harinya, sehingga sangat sedikit kapal yang melayani para wisatawan. Hal ini menyebabkan berbagai macam persoalan dalam transportasi angkutan wisata, seperti kapal yang tidak terpenuhi, perjalanan yang sangat lama dan kurangnya keselamatan penumpang menuju Pulau Biawak. Oleh sebab itu diperlukan sarana transportasi laut untuk mengatasi permasalahan tersebut,. Pada studi ini dilakukan analisis teknis dan ekonomis dengan menggunakan kapal pembanding yang diperiksa kembali batasan-batasannya sesuai dengan daerah pelayaran yang mempunyai kedalaman rata-rata 2 meter. Berdasarkan analisis yang telah dilakukan didapatkan ukuran optimal bis air, yaitu L= 10.4 m, B= 4.7m, H= 1.2 m dan T= 0.3 m. Dari ukuran tersebut kemudian dibuat Lines Plan, General Arrangement dan Safety Plan.

IPTEK Journal of Proceedings Series

Proceedings of the 3rd International Conference on Marine Technology

International Journal of Technology

One aspect that needs to be studied in submarine design is the hydrodynamic aspect relating to su... more One aspect that needs to be studied in submarine design is the hydrodynamic aspect relating to submarine maneuverability. This research begins by calculating the value of drag and lift on the three variations of the after body’s mini submarine. The first variation as the initial design is rudder and stern plane arranged perpendicularly or named the+ Stern. Then for the second variation made changes to the arrangement of rudder and stern plane in the after body of the mini submarine with + Stern arrangement, the rudder arranged each other crossed so that it resembles the letter X and called the X-Stern arrangement. Further, for the third variation, the upper rudder of the X-Stern arrangement is replaced by the upper rudder of the + Sternarrangement so that it resembles the inverted Y letter and is called the Y-Stern arrangement. Drag and lift are calculated numerically by using ANSYS-CFX software. From the calculation of CFD found that the submarine with after-body Y-Stern arrangeme...

The effect of resistance interference on catamarans was investigated experimentally. The model hu... more The effect of resistance interference on catamarans was investigated experimentally. The model hull forms comprise a symmetrical catamaran along with laterally separated and longitudinally staggered demihull configurations. To this aim, a series of tests on the models were conducted at the Towing Tank of the Indonesia Hydrodynamic Laboratory (IHL) over a speed range corresponding to Froude numbers of up to 0.65. In this paper, experimental results are presented in tabular and graphical form and the resistance characteristics and interference effects are discussed and compared with other published data. The test results show that favourable interference has been observed around Fr> 0.5 for the hull clearance and around Fr = 0.4 – 0.55 for the staggered catamarans. These results may prove useful for designers at the conceptual or preliminary design stages.

Sektor perikanan merupakan salah satu sektor dengan potensi terbesar pada wilayah Provinsi Kepula... more Sektor perikanan merupakan salah satu sektor dengan potensi terbesar pada wilayah Provinsi Kepulauan Riau dikarenakan lebih dari 96% luas wilayah merupakan lautan, namun potensi yang sangat besar ini justru seringkali dimanfaatkan oleh kapal-kapal berbendera asing untuk melakukan praktek illegal fishing pada daerah fishing ground Kepulauan Riau, khususnya perairan Natuna. Kapal-kapal ikan berbendera Indonesia pada daerah Kepulauan Riau masih belum maksimal dalam memanfaatkan potensi ini dikarenakan jumlah armada kapal yang masih sedikit, dan juga penerapan teknologi yang masih sederhana/konvensional. Dengan maksud untuk menunjang pemanfaatan potensi sektor perikanan Provinsi Kepulauan Riau yang masih berada diangka 4-6%, maka pada Tugas Akhir ini akan didesain kapal ikan hibrida berbahan dasar plastik HDPE yang mempunyai tiga sumber daya utama yang merupakan energi terbarukan yakni angin (Vertical Axis Wind Turbines), sinar matahari (Photovoltaic Panel) dan juga gas hidrogen (Fuel C...

IPTEK The Journal for Technology and Science

Ship maneuverability is important to study because it affects safety. Moreover, if the ship opera... more Ship maneuverability is important to study because it affects safety. Moreover, if the ship operates in a narrow shipping lane, as experienced by SPUB that operated in Musi River. This research focuses on the experimental process of SPUB maneuvers in open water, especially for the turning circles' movement. The experiment was conducted using a prototype, model SPB-XXOO, which was equipped with components of the instrumentation system such as data logger and propulsion system. Both are integrated into the remote control and computer to perform control functions, calculations, data logging, and data transfer through the wireless communication system. The main controller of the propulsion system is an implanted program to deflect the rudder automatically. Three rudder models with variations in aspect ratios of 1.10, 1.65, and 2.20, also two variations of the rudder angle; 30o and 35o are used to test the model. GPS does the data acquisition process for each experimental process. Based on the analysis of the rudder model's effect, it was found that a rudder with a large aspect ratio provides better performance than a lower aspect ratio. The average increase in the maneuver performance of the rudder with the smallest to the most significant aspect ratio is 17.345%.

Jurnal Teknik ITS, Feb 22, 2019

Abstrak-HYDROCONTEST merupakan perlombaan kapal cepat dan efisien antar mahasiswa di tingkat inte... more Abstrak-HYDROCONTEST merupakan perlombaan kapal cepat dan efisien antar mahasiswa di tingkat internasional dalam format race menggunakan kapal yang didesain, diteliti, dan diproduksi sendiri oleh para mahasiswa. Perlombaan ini mendorong para peserta untuk berinovasi dalam menghasilkan kapal dengan performa keseluruhan yang baik dari segi hambatan, propulsi, maneuvering, dan efisinesi sistem elektrik. Melihat iklim riset dalam perlombaan dan berdasarkan pengalaman/keikutsertaan tim HYDRONE ITS dalam HYDROCONTEST 2017, dilakukan proses desain kapal yang akan digunakan tim HYDRONE ITS dalam HYDROCONTEST 2018 dimana dalam proses desain ini juga dilakukan analisa CFD pada 3 variasi bentuk haluan kapal dan optimisasi sistem propulsi (pitch propeller dan RPM) agar kapal memiliki kecepatan dan endurance yang optimal. Dari proses penelitian ini, diperoleh desain kapal monohull dengan haluan berupa axe bow dengan estimasi kecepatan maksimal 5.25 m/s dan jumlah jarak tempuh maksimum 24 lap lintasan tanpa mengisi ulang baterai.

Jurnal Kelautan Nasional

Dalam pengoperasian kapal selam, olah gerak (maneuver) yang baik diperlukan pada saat melakukan s... more Dalam pengoperasian kapal selam, olah gerak (maneuver) yang baik diperlukan pada saat melakukan serangan maupun menghindar dari serangan musuh. Salah satu komponen teknologi kapal selam yang perlu dikembangkan untuk mencapai maneuver yang baik adalah komponen hydroplane yang tersusun pada bagian after body kapal selam. Kapal selam itu dapat melakukan olah gerak vertikal mapun horizontal dengan menggunakan sistem kendali gerak (hydroplane). Ukuran geometri dan bentuk lambung dari kapal selam mempengaruhi karakteristik maneuver kapal selam. Untuk mencapai karakteristik maneuver yang diinginkan diperlukan perancangan ulang sistem kendali hydroplane. Penelitian ini diawali dengan membuat variasi bentuk after body kapal selam dan memprediksi lintasan gerak melingkar kapal selam. Perhitungan gaya hidrodinamika dan momen dilakukan secara numerik dengan menggunakan software Computational Fluid Dynamic (CFD-CFX). Kemudian dengan menggunakan software MATLAB , data-data hasil dari perhitunga...

International Journal of Technology

Nowadays, the issue of energy efficiency in the maritime transportation sector has been strongly ... more Nowadays, the issue of energy efficiency in the maritime transportation sector has been strongly associated with the decreasing use of fossil energy and greenhouse gas emissions. Crew boats are one of the ship modes which consumes a lot of fuel in maritime transportation. This affects the number of exhaust gases released into the atmosphere. A study into the estimation of crew boat resistance was carried out experimentally using a towing tank, numerically using a CFD methodology, and then compared with Savitsky's method. Measurements were taken in calm waters under even keel and trim scenarios, considering load variation had been adjusted for. Determining the correct load position affected the LCG (Longitudinal Center of Gravity) and VCG (Vertical Center of Gravity) parameters, affected trim, and decreased crew boat resistance. Overall results showed that the experimental test, CFD method, and the empirical estimation from Savitsky were in good agreement with average errors up to 3%. The calculation results demonstrated that trim had a greater influence on decreasing resistance up to 3.062% than even keel position. Furthermore, the shifting of LCG had a more significant effect than that of VCG in the context of resistance changes.

Proceedings of the 4th International Conference on Marine Technology, 2019

Jurnal Teknik ITS, 2019

Pesatnya perkembangan industri di Indonesia masih menyisakan beberapa daerah terpencil dalam kead... more Pesatnya perkembangan industri di Indonesia masih menyisakan beberapa daerah terpencil dalam keadaan belum teraliri listrik, salah satunya yaitu Kabupaten Kepulauan Selayar, Sulawesi Selatan. Menanggapi hal tersebut, penggunaan energi terbarukan; energi panas matahari dapat dijadikan solusi kurangnya pemerataan pembangunan pembangkit listrik pada daerah terpencil tersebut. Dengan memanfaatkan kondisi geografis Kepulauan Selayar yang dikelilingi laut, hal tersebut dapat didesain Pembangkit Listrik Tenaga Surya Apung (PLTSA) yang terdiri dari barge dengan lambung katamaran sebagai media apung dari panel surya dan inverter sehingga nantinya satu PLTSA dapat memenuhi kebutuhan listrik pada beberapa kecamatan walaupun berada di pulau yang berbeda. Dengan menggunakan grid-tie system, pasokan listrik yang dihasilkan dapat langsung dialirkan ke grid PLN daerah setempat. Berdasarkan informasi dan kebutuhan listrik di Kabupaten Kepulauan Selayar, dibutuhkan sekitar 4 barge dengan 2410 unit panel surya dan 4 inverter pada tiap kapalnya untuk memenuhi kebutuhan daya listrik per hari sebesar 1.849.362,051 W. Ukuran utama kapal yang didapatkan adalah L = 164 m, B = 42 m, H = 4,2 m, T = 1,2 m. Dari ukuran utama kapal tersebut, didapatkan perhitungan analisis teknis, analisis ekonomis, analisis sensitivitas, serta gambar Lines Plan, General Arrangement, dan 3D Modeling.

Jurnal Teknik ITS, 2019

Indonesia merupakan negara maritim yang terbesar di dunia dengan 80% dari wilayahnya yang berupa ... more Indonesia merupakan negara maritim yang terbesar di dunia dengan 80% dari wilayahnya yang berupa lautan. Hal ini menyebabkan susahnya pengawasan terhadap keamanan dan kedaulatan wilayah NKRI khususnya dalam sektor maritime. Oleh karena itu dibutuhkan desain kosep kapal cepat katamaran yang baik dan cepat tanggap sebagai alusista perang dan pengamanan wilayah maritim Indonesia. Tujuan dari desain kapal Tank Boat ini adalah 1. menentukan operational requirements kapal perang serbu Catamaran Tank Boat dengan Turbojet, 2. Memperoleh ukuran utama kapal perang serbu Catamaran Tank Boat dengan Turbojet, 3. Mendapatkan lines plan dan rencana umum kapal perang serbu Catamaran Tank Boat dengan Turbojet, 4. Mendesain layout awal rencana umum dan model 3D kapal perang serbu Catamaran Tank Boat dengan Turbojet. Dalam proses desain awal kapal perang ini, dilakukan penentuan operational requirement kapal dan ukuran utama kapal yang diperoleh dari metode parent ship dengan ukuran utama LOA=18 m, B...

IOP Conference Series: Materials Science and Engineering, 2021

Ship maneuvering is defined as the inherent capability of a vessel to turn its path based on the ... more Ship maneuvering is defined as the inherent capability of a vessel to turn its path based on the hydrodynamics principles. The maneuvering performance becomes important to the safety of navigation when a ship operates. In case of vessel turning motion, International Maritime Organization (IMO) requires the maximum tactical diameter is five times of the ship lengths. Tactical diameter is the distance travelled by the ship’s center of gravity in a parallel direction to the ship’s initial path. In this paper, semi-empirical approach proposed by Clarke (1983) was used to obtain the first derivative of hydrodynamics equation. After that, the maneuvering performance was calculated using Son and Nomoto’s mathematical model (1981). Based on IMO regulations, the calculation of tactical diameter was conducted with 35° of rudder position. The calculation and analysis of tactical diameter was carried out according to relevant procedure of the ship maneuvering provided by IMO. The calculation re...

CFD Letters, 2022

Energy efficiency and environmental sustainability are important aspects in ship design and opera... more Energy efficiency and environmental sustainability are important aspects in ship design and operation. Hull-shape optimization, hull cleaning and coating, and the use of appendages are, among others, well-known efforts to reduce ship fuel consumption. Regarding energy efficiency and environmental sustainability, it is possible to effectively reduce the resistance of an existing catamaran by retrofitting a foil system to it. In this study, a foil system is designed and retrofitted to a catamaran to reduce its total resistance. Reynolds-averaged Navier-Stokes simulations, utilizing k-w SST turbulence model, were performed to study the effects of the foil system on the vessel’s total resistance. Free surface effects were modelled, i.e., the generation of waves due to the vessel’s movement on the water surface. The foil system affects the wetted surface area, running sinkage and trim, and the wave pattern generated by the vessel, which ultimately affect the vessel’s total resistance. At...

IOP Conference Series: Materials Science and Engineering, 2021

Search and rescue operations, especially in ship accidents, require speed and reliability from th... more Search and rescue operations, especially in ship accidents, require speed and reliability from the rescue vessels in facing the challenges of extreme weather and sea waves. A rescue boat hydrodynamic performance study is very important to do to determine the ship’s ability to withstand dangerous conditions while operating. Therefore, a rescue boat design is needed that is capable of high acceleration and can penetrate various extreme sea condition. Three rescue boat hull models have been developed to obtain the hull model with the best seakeeping performance. A numerical arrangement based on computational fluid dynamics (CFD) techniques is used to predict seakeeping behaviour from three rescue boat hull model in wave. Three-dimensional diffraction panel method uses as a CFD solver method to predict the seakeeping performance of rescue boat high-speed operation in wave. From the study results, it was found that the first rescue boat hull model had a good seakeeping performance compar...

Jurnal Teknik ITS, 2017

Biawak terletak di laut jawa di Kabupaten Indramayu Jawa Barat di sebelah utara semenanjung Indra... more Biawak terletak di laut jawa di Kabupaten Indramayu Jawa Barat di sebelah utara semenanjung Indramayu seitar 40 kilometer dari pantai utara Indramayu. Pulau biawak adalah salah satu tempat pariwisata yang menarik untuk dikunjungi, daratan seluas 120 hektare kaya akan dengan tanaman bakau, pesona laut yang masih 'perawan', disini terdapat mercusuar juga yang masih berfungsi yang didirikan sejak zaman Belanda dan terdapat juga ikon pulau ini yaitu hewan varanus salvator atau biawak yang sering kita sebut dan wisata lainnya. Sehingga sekarang banyak wisatawan dari daerah luar Kabupaten Indramayu seperti Jakarta, Cirebon dan bahkan luar Jawa Barat yang menuju Pulau Biawak setiap harinya, sehingga sangat sedikit kapal yang melayani para wisatawan. Hal ini menyebabkan berbagai macam persoalan dalam transportasi angkutan wisata, seperti kapal yang tidak terpenuhi, perjalanan yang sangat lama dan kurangnya keselamatan penumpang menuju Pulau Biawak. Oleh sebab itu diperlukan sarana transportasi laut untuk mengatasi permasalahan tersebut,. Pada studi ini dilakukan analisis teknis dan ekonomis dengan menggunakan kapal pembanding yang diperiksa kembali batasan-batasannya sesuai dengan daerah pelayaran yang mempunyai kedalaman rata-rata 2 meter. Berdasarkan analisis yang telah dilakukan didapatkan ukuran optimal bis air, yaitu L= 10.4 m, B= 4.7m, H= 1.2 m dan T= 0.3 m. Dari ukuran tersebut kemudian dibuat Lines Plan, General Arrangement dan Safety Plan.

IPTEK Journal of Proceedings Series

Proceedings of the 3rd International Conference on Marine Technology

International Journal of Technology

One aspect that needs to be studied in submarine design is the hydrodynamic aspect relating to su... more One aspect that needs to be studied in submarine design is the hydrodynamic aspect relating to submarine maneuverability. This research begins by calculating the value of drag and lift on the three variations of the after body’s mini submarine. The first variation as the initial design is rudder and stern plane arranged perpendicularly or named the+ Stern. Then for the second variation made changes to the arrangement of rudder and stern plane in the after body of the mini submarine with + Stern arrangement, the rudder arranged each other crossed so that it resembles the letter X and called the X-Stern arrangement. Further, for the third variation, the upper rudder of the X-Stern arrangement is replaced by the upper rudder of the + Sternarrangement so that it resembles the inverted Y letter and is called the Y-Stern arrangement. Drag and lift are calculated numerically by using ANSYS-CFX software. From the calculation of CFD found that the submarine with after-body Y-Stern arrangeme...

The effect of resistance interference on catamarans was investigated experimentally. The model hu... more The effect of resistance interference on catamarans was investigated experimentally. The model hull forms comprise a symmetrical catamaran along with laterally separated and longitudinally staggered demihull configurations. To this aim, a series of tests on the models were conducted at the Towing Tank of the Indonesia Hydrodynamic Laboratory (IHL) over a speed range corresponding to Froude numbers of up to 0.65. In this paper, experimental results are presented in tabular and graphical form and the resistance characteristics and interference effects are discussed and compared with other published data. The test results show that favourable interference has been observed around Fr> 0.5 for the hull clearance and around Fr = 0.4 – 0.55 for the staggered catamarans. These results may prove useful for designers at the conceptual or preliminary design stages.

Sektor perikanan merupakan salah satu sektor dengan potensi terbesar pada wilayah Provinsi Kepula... more Sektor perikanan merupakan salah satu sektor dengan potensi terbesar pada wilayah Provinsi Kepulauan Riau dikarenakan lebih dari 96% luas wilayah merupakan lautan, namun potensi yang sangat besar ini justru seringkali dimanfaatkan oleh kapal-kapal berbendera asing untuk melakukan praktek illegal fishing pada daerah fishing ground Kepulauan Riau, khususnya perairan Natuna. Kapal-kapal ikan berbendera Indonesia pada daerah Kepulauan Riau masih belum maksimal dalam memanfaatkan potensi ini dikarenakan jumlah armada kapal yang masih sedikit, dan juga penerapan teknologi yang masih sederhana/konvensional. Dengan maksud untuk menunjang pemanfaatan potensi sektor perikanan Provinsi Kepulauan Riau yang masih berada diangka 4-6%, maka pada Tugas Akhir ini akan didesain kapal ikan hibrida berbahan dasar plastik HDPE yang mempunyai tiga sumber daya utama yang merupakan energi terbarukan yakni angin (Vertical Axis Wind Turbines), sinar matahari (Photovoltaic Panel) dan juga gas hidrogen (Fuel C...

IPTEK The Journal for Technology and Science

Ship maneuverability is important to study because it affects safety. Moreover, if the ship opera... more Ship maneuverability is important to study because it affects safety. Moreover, if the ship operates in a narrow shipping lane, as experienced by SPUB that operated in Musi River. This research focuses on the experimental process of SPUB maneuvers in open water, especially for the turning circles' movement. The experiment was conducted using a prototype, model SPB-XXOO, which was equipped with components of the instrumentation system such as data logger and propulsion system. Both are integrated into the remote control and computer to perform control functions, calculations, data logging, and data transfer through the wireless communication system. The main controller of the propulsion system is an implanted program to deflect the rudder automatically. Three rudder models with variations in aspect ratios of 1.10, 1.65, and 2.20, also two variations of the rudder angle; 30o and 35o are used to test the model. GPS does the data acquisition process for each experimental process. Based on the analysis of the rudder model's effect, it was found that a rudder with a large aspect ratio provides better performance than a lower aspect ratio. The average increase in the maneuver performance of the rudder with the smallest to the most significant aspect ratio is 17.345%.

Jurnal Teknik ITS, Feb 22, 2019

Abstrak-HYDROCONTEST merupakan perlombaan kapal cepat dan efisien antar mahasiswa di tingkat inte... more Abstrak-HYDROCONTEST merupakan perlombaan kapal cepat dan efisien antar mahasiswa di tingkat internasional dalam format race menggunakan kapal yang didesain, diteliti, dan diproduksi sendiri oleh para mahasiswa. Perlombaan ini mendorong para peserta untuk berinovasi dalam menghasilkan kapal dengan performa keseluruhan yang baik dari segi hambatan, propulsi, maneuvering, dan efisinesi sistem elektrik. Melihat iklim riset dalam perlombaan dan berdasarkan pengalaman/keikutsertaan tim HYDRONE ITS dalam HYDROCONTEST 2017, dilakukan proses desain kapal yang akan digunakan tim HYDRONE ITS dalam HYDROCONTEST 2018 dimana dalam proses desain ini juga dilakukan analisa CFD pada 3 variasi bentuk haluan kapal dan optimisasi sistem propulsi (pitch propeller dan RPM) agar kapal memiliki kecepatan dan endurance yang optimal. Dari proses penelitian ini, diperoleh desain kapal monohull dengan haluan berupa axe bow dengan estimasi kecepatan maksimal 5.25 m/s dan jumlah jarak tempuh maksimum 24 lap lintasan tanpa mengisi ulang baterai.

Jurnal Kelautan Nasional

Dalam pengoperasian kapal selam, olah gerak (maneuver) yang baik diperlukan pada saat melakukan s... more Dalam pengoperasian kapal selam, olah gerak (maneuver) yang baik diperlukan pada saat melakukan serangan maupun menghindar dari serangan musuh. Salah satu komponen teknologi kapal selam yang perlu dikembangkan untuk mencapai maneuver yang baik adalah komponen hydroplane yang tersusun pada bagian after body kapal selam. Kapal selam itu dapat melakukan olah gerak vertikal mapun horizontal dengan menggunakan sistem kendali gerak (hydroplane). Ukuran geometri dan bentuk lambung dari kapal selam mempengaruhi karakteristik maneuver kapal selam. Untuk mencapai karakteristik maneuver yang diinginkan diperlukan perancangan ulang sistem kendali hydroplane. Penelitian ini diawali dengan membuat variasi bentuk after body kapal selam dan memprediksi lintasan gerak melingkar kapal selam. Perhitungan gaya hidrodinamika dan momen dilakukan secara numerik dengan menggunakan software Computational Fluid Dynamic (CFD-CFX). Kemudian dengan menggunakan software MATLAB , data-data hasil dari perhitunga...