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KOMPONEN GAYA HAMBATAN KAPAL CEPAT Iskendar, Iskendar
Jurnal Sains dan Teknologi Indonesia Vol. 8 No. 2 (2006)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Ship resistance is very importance to learn as we need to calculate the main power of the ship to reach the defined speed. In fact ship resistance has several components, which one and each other make interaction and mechanism in the emerging of ship resistance. This paper will focus on the explanation of the component of ship resistance in the case of high speed vessel.

KETAKSTABILAN MEMANJANG KAPAL BERSAYAP SEBELUM TINGGAL PERMUKAAN H. Priyatno, Dany; Iskendar, Iskendar
Jurnal Sains dan Teknologi Indonesia Vol. 8 No. 2 (2006)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Wing in Surface Effect (WiSE) craft or winged ship is a peripatetic transportation floating to surface by exploiting dynamic cushion because surface effect influence and form of the means wing. This craft adopted high speed planning hull for its fuselage hullform design, the lateral and longitudinal instability always occurs during planing mode operations. In this paper the study and investigate both theoretical and experimentals of longitudinal dynamic instability done, especially the porpoising fenomena of the high speed craft in the water territory. Porpoising is the effect as a self-sustained coupled motion of pitching and heaving.

UJI TARIK HIDRODINAMIKMODEL KAPAL BERSAYAP WiSE DENGAN LAMBUNG DASAR BERSTEP Iskendar, Iskendar; Jamaludin, Andi; Indiyono, Paulus
Jurnal Sains dan Teknologi Indonesia Vol. 12 No. 3 (2010)
Publisher : Badan Pengkajian dan Penerapan Teknologi

This paper describes hydrodynamic model tests of Wing in Surface Effect (WiSE) Craft. These craft was fitted with stephull form in different location on longitudinal flat bottom (stepedhull planning craft) to determine the influences of sticking and porpoising motion performances. These motions are usually occured when the craft start to take-off from water surfaces. The test models with scale of 1 : 7 were comprised of 4 (four) stephull models and 1 (one) non-stephull model as a comparative study. The hydrodynamic tests were performed with craft speed of 16 – 32 knots (prototype values) in Towing Tank at UPT. Balai Pengkajian dan Penelitian Hidrodinamika (BPPH), BPPT, Surabaya. The resistance (drag) was measured by dynamo meter and the trim of model (draft changing at fore and aft of model due to model speed) was measured by trim meter. By knowing the value of model trim, the wetted surface area can be determined. Then, the lift forces were calculated based on these measured values. The model test results were presented on tables and curves. Test results show that models with step located far away from center of gravity of the WiSE craft tend to porpoising and sticking condition, except if the step location on the below of these center of gravity. While model without step tends to sticking conditions.

The Effects of Water Debit and Number of Blades on the Power Generated of Prototype Turbines Propeller as Renewable Electricity Biantoro, Agung Wahyudi; Iskendar, Iskendar; Subekti, Subekti; bin Muhd Noor, Nik Hisyamudin
Jurnal Rekayasa Mesin Vol 12, No 1 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.01.22

This research is a prototype design of a Pico hydropower plant. The Pico hydro laboratory scale is planned to be installed at the water outlet at the steam gas power plant (PLTGU) in Cilegon, whose water discharge has not been utilized. Pico hydro will produce green energy, which in turn can partially replace fossil energy needs. The purpose of this study was to determine the effect of water discharge and the number of blades on the power generated by Pico hydro. The method used in this research is an experimental method carried out in the laboratory, by designing and making Pico hydro prototypes, with several variations in the number of blades. The results of the manual calculation analysis show that the mass flow rate, circumferential speed, and the highest rotational speed are found in blade 6. Furthermore, the design process uses the CFD method, which produces the best energy when using 6 or 7 blades.Â The stronger the water discharge, the higher the Rpm, and the stronger the electric current and the resulting voltage. The water discharge of 0.04 m3/s produces 215 Rpm, a current of 0.30 ampere, and a voltage of 2.00 volts. While the airflow rate of 0.08 m3/s produces 695 Rpm, a current of 0.70 ampere,s and a voltage of 4.30 volts. Statistical analysis also shows that the higher the Rpm value of the 6 blade turbine, the higher the power and current it produces.

Pemanfaatan Energi Biogas untuk Pembangkit Listrik di Desa Tuwang Kecamatan Karanganyar Kabupaten Demak Muhammad Sukron; Iskendar Iskendar
Teknobiz : Jurnal Ilmiah Program Studi Magister Teknik Mesin Vol 10 No 2 (2020): Teknobiz
Publisher : Magister Teknik Mesin Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/teknobiz.v10i2.1485

The Increase of energy demand in Indonesia causes the need for alternative energy to replace fossil energy. One of alternative energy is renewable energy that obtained from nature freely. Tuwang Village in Karanganyar District, Demak Regency has the potential for renewable energy from methane gas produced by cow dung on farms. Cow dung is tested in the laboratory to take the methane gas content. Two chambers biodigester from fiberglass are used to ferment and hold biogas which is then used as fuel on the stove. From 171 kg of cow manure that mixed with water in a ratio of 1:3, the ideal digestification time with the highest energy production of 689 kJ is 22 days. The average of CH4 composition is around 50% from the total of biogas content. The total energy obtained during the water heating process is 4.32 MJ, smaller than the theoretical energy calculation (20,52 MJ). Based on the results of experiments, it can be estimated that biogas energy generated from Tuwang Village each day is 40,42 MJ. Biogas energy power plant can use a genset or stirling engine with 468 Watt of power. This power can be used for neighborhood association lighting needs.

The influence of battery-powered engine on the reduction of carbon dioxide production from fishing boats Octaviani, Nilam Sari; Waskito, Dwitya Harits; Iskendar, Iskendar; Muis, Abdul; Fuadi, Noor Muhammad Ridha; Muhajirin, Muhajirin; Palebangan, Hendra; Ismoyo, Kunto; Kartikasari, Dewi; Gutami, Nanda Itohasi; Ajidarmo, Kusno
Journal of Mechatronics, Electrical Power, and Vehicular Technology Vol 14, No 2 (2023)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/j.mev.2023.v14.208-214

Several technologies are currently being applied in the maritime industry to reduce greenhouse gas (GHG) emissions. An example is the implementation of an electric propulsion system with a battery charged using a renewable energy source. Meanwhile, it is important to analyze the energy demand and the quantity of emissions reduced in a vessel after installing this system. Therefore, this study focused on analyzing the energy demand and emissions produced on fishing boats, specifically the “Sandeq” fishing boats in West Sulawesi. The primary objective was to quantify the carbon dioxide emissions reduced after the conventional engine of the vessel was replaced with an electric propulsion system. Moreover, the energy demand of the boat was estimated by analyzing the daily speed, length of voyage, and engine capacity. The results showed that six batteries were required to provide the power needed for daily operation. Furthermore, the electric propulsion system was able to reduce CO2 emission by 7.94 tons annually per ship, leading to the reduction of fuel consumption and emission taxes to approximately 10 million Rupiah annually. These results were expected to encourage stakeholders to promote the transition from conventional diesel engines to electric-powered engines.

Design of Airscrew Propeller as an Alternative Main Propulsion for Wing in Surface Effect (WiSE) A2C Using the Simplified Method Approach Sasmito, Cahyo; Pujiwat, Rutma; Priatno, Dany Hendrik; Iskendar, Iskendar; Khoirudin, Muh Hisyam; Eskayudha, Dimas Bahtera
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 2 (2024): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i2.77937

This study focused on developing an airscrew propeller as an alternative propulsion system for the Wing in Surface Effect (WiSE) A2C, employing a rigorous and systematic scientific approach. The design and calculation methodology were grounded in the "simplified method" introduced by Hovey. This technique has proven effective for preliminary propeller design despite its reliance on several assumptions and simplifications. This method balances practicality with empirical data, offering a straightforward framework for generating initial design parameters without extensive computational demands. Although the simplified method has limitations, such as its dependence on empirical observations and reduced computational precision, it remains effective for developing foundational design concepts. The study leveraged this approach to create a propeller design that aligns with the aerodynamic and performance requirements specific to the WiSE A2C. The resulting design features an airscrew propeller with an RAF-6 airfoil profile and a diameter of 685 mm. The RAF-6 profile was chosen for its favorable aerodynamic characteristics, including a high lift-to-drag ratio, which is crucial for optimizing propulsion efficiency. This tailored design ensures compatibility with the operational environment of the WiSE A2C, enhancing its overall performance and stability while meeting specific aerodynamic goals.

Pemanfaatan Energi Biogas untuk Pembangkit Listrik di Desa Tuwang Kecamatan Karanganyar Kabupaten Demak Muhammad Sukron; Iskendar Iskendar
Teknobiz : Jurnal Ilmiah Program Studi Magister Teknik Mesin Vol. 10 No. 2 (2020): Teknobiz
Publisher : Magister Teknik Mesin Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/teknobiz.v10i2.1485

The Increase of energy demand in Indonesia causes the need for alternative energy to replace fossil energy. One of alternative energy is renewable energy that obtained from nature freely. Tuwang Village in Karanganyar District, Demak Regency has the potential for renewable energy from methane gas produced by cow dung on farms. Cow dung is tested in the laboratory to take the methane gas content. Two chambers biodigester from fiberglass are used to ferment and hold biogas which is then used as fuel on the stove. From 171 kg of cow manure that mixed with water in a ratio of 1:3, the ideal digestification time with the highest energy production of 689 kJ is 22 days. The average of CH4 composition is around 50% from the total of biogas content. The total energy obtained during the water heating process is 4.32 MJ, smaller than the theoretical energy calculation (20,52 MJ). Based on the results of experiments, it can be estimated that biogas energy generated from Tuwang Village each day is 40,42 MJ. Biogas energy power plant can use a genset or stirling engine with 468 Watt of power. This power can be used for neighborhood association lighting needs.

COMPARATIVE ANALYSIS BETWEEN AHP MOORA AND AHP-ELECTRE METHOD FOR OPTIMAL ELECTRIC AND SOLAR-POWERED SHIPYARD SITE SELECTION Ispandiari, Ade Ratih; Yustina, Nanda; Qonita, Zulfa; Shabrina, Nurul; Gutami, Nanda Itohasi; Rochyntawati, Annissa; Iskendar, Iskendar
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 17 No 4 (2023): BAREKENG: Journal of Mathematics and Its Applications
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol17iss4pp2381-2396

Transportation is the second largest emitter of CO2 in the world, accounting for 25% of total CO2 emissions. To achieve a zero-carbon shipping industry, Indonesia can use its high sun exposure to generate electrical energy by using solar cell technology, which converts solar energy into electrical power. To answer the challenge, this research will start with the site selection of electric and solar-powered shipyards. This research tries to solve the problem of selecting the best location for electric and solar-powered shipyards by using the Multi-Criteria Decision Making (MCDM) method. The purpose of this research is to get the optimal location of electric and solar shipyards using AHP-MOORA and AHP-ELECTRE methods. There are three alternative locations in the location selection. Alternatives 1 and 3 are in Paciran District, Lamongan Regency, East Java Province, and alternative 2 is in Serang Regency, Banten Province. Alternative site 1 has an area of 38 ha and is located in Sidokelar Village, Paciran Sub-district. Decision-makers determine the parameters that will be evaluated from each alternative location, such as slope, soil type, rainfall, and 18 other criteria. In determining the weighting of parameters, a method that has a consistency test is needed so that the weight results obtained are consistent and objective. The study result shows that alternative location 1 is the best location for the electric and solar-powered shipbuilding industry, the same conclusion using the AHP-MOORA Integration approach and the AHP weighting ELECTRE Integration approach.

Analisis Risiko Pembangunan Kapal Bertenaga Listrik dan Surya Untuk Mendukung Net Zero Emisi Hendra Palebangan; Muhajirin Muhajirin; Iskendar Iskendar; Dewi Kartikasari
Prosiding Seminar Nasional Ilmu Teknik Vol. 1 No. 1 (2024): Prosiding Seminar Nasional Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/prosemnasproit.v1i1.5

Vehicle electrification is becoming a growing trend in the transportation industry due to environmental concerns. Therefore, various global efforts are being made to develop electric-driven ships using environmentally friendly energy sources such as batteries. In the implementation of electric and solar-powered shipbuilding, there is always the potential for delays in completion. This is very detrimental to shipyard owners and even ship owners because it is not to the initial plan. Shipyard owners and shipowners must bear greater or unexpected costs due to delays in work. Other risks also have the potential to arise when electric and solar-powered ships are completed until operation. Delays in the completion of electric and solar-powered shipbuilding can be caused by various things. Through this research, the risk analysis of the development of the electric and solar-powered ship industry is discussed in terms of several aspects, namely market, legal, technical, socio-economic environmental, and financial aspects.

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