Kumpulan Jurnal dan Prosiding Elektronik PPNS (Politeknik Perkapalan Negeri Surabaya - Pusat Penelitian dan Pengabdian Masyarakat, P3M)
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Pendekatan Penurunan Peforma kapal Ferry Ro-Ro menggunakan Energy Efficiency Operational Indicator (EEOI)
No full textRo-Ro Passanger ships have a fairly high development can be evidenced in the Ministry of Transportation which records the development of the number of Ro-Ro Passanger ships that are increasing in 2011 - 2022 in this case it does not escape the spread of ship fuel emissions to the environment, therefore the need for regulation in dealing with ship emissions. So that measurements must be developed, measurements are carried out on logistics and the scope of Maritime transportation. This regulation was developed by the IMO to reduce emissions in ships. For This study has a goal, namely to approach the decline in the performance of the Ro-Ro Ferry using the Energy Efficiency Operational Indicator (EEOI) approach. This study compares EEOI in Predicted and EEOI in Actual (Recorded), the result from this comparison may be expressed as a representation of hull and propeller fouling and decreased Engine performance. Obtained an error difference value of 6.06%
KAJIAN NUMERIK PENGARUH PUSH DAN PULL VELOCITY TERHADAP PENYEBARAN DROPLET YANG KELUAR BERSAMA BATUK PADA DOWNWARD PUSH-PULL VENTILATION DENGAN MODEL PENGUAPAN DROPLET
No full textThe transmission of Covid-19 is still increasing in many parts of the world, such as Indonesia. The main cause of the increase in this virus is the large number of people in a country who have not received booster vaccinations in various groups. Social Distancing must be implemented so that the virus does not increase. The industry has one reason to implement social distancing. So in this study, there is one solution system that can protect workers when working indoors to reduce the risk of virus transmission, namely air curtains. For this reason, a push-pull ventilation analysis was carried out with a droplet evaporation model using CFD (Computational Fluid Dynamic) and SALOME software and varying the meshing with a value of 0.04 and variations in the Push-Pull ratio speed and distance. From the simulation results obtained at the ratio of the peak cough speed of 0.05Vc with a ratio of 1 Blow nozzle is 0.7813 m/s and Suction nozzle 0.7813 m/s and a ratio of 2 Blow nozzles is 0.7813 m/s and Suction nozzle 0.1526 m/s. that the larger the ratio, the smaller the percentage of droplets that penetrate the air curtain, however if there is an anomaly in the air curtain, the large ratio is unable to hold the droplets as well as with a larger ratio of 0.01Vc
Kajian Eksperimen Pengaruh Variasi Sudut Deflektor di Depan Returning Blade Terhadap Performa Turbin Angin Savonius Dengan Persamaan Myring n=1
No full textIndonesia has wind energy potential of 970MW, which allows wind turbines to generate electricity. Savonius wind turbines are suitable for it because they can be operated at low wind speed. Many studies had been conducted to improve the performance of these turbines. Additional deflector could enhance the performance of overlapping Savonius wind turbines, but additional deflector plates with Myring n=1 has not been tested yet. This experimental study involved adding a deflector of 50cm long and 40cm high in front of returning blade with Myring n=1. Thedeflector angles are ?= 30°, 35°, 45°, and 60°. Variation of wind speeds are 5m/s, 6m/s, and 7m/s. The study aimed to determine the turbine performance after adding deflector in terms of coefficient of torque (Ct) and coefficient of power (Cp). The results indicated that adding the deflector and varying its angles in front of returning blade with Myring n=1 Savonius wind turbine doesn’t perform better than without any deflector. There are a decrease in the coefficient of torque (Ct) by 30% to 95% and also in the coefficient of power (Cp) by 33% to 98% at a wind speed 6m/s
ANALISIS PERFORMA FOUR STROKE DIESEL ENGINE DENGAN MULTI-FEEDSTOCK BIODIESEL (MINYAK KELAPA SAWIT, MINYAK JELANTAH, MINYAK BUNGA MATAHARI)
No full textPetroleum is the main source of energy in everyday life, especially in the transportation sector. However, with the decreasing availability of petroleum, alternative renewable fuels, such as biodiesel, are needed. This research focuses on the production of multi-feedstock biodiesel using esterification and transesterification methods using palm oil, used cooking oil, and sunflower oil as feedstocks, as well as NaOH and methanol catalysts. Palm oil is abundant and economical in Indonesia, making it an affordable and readily available option. Used cooking oil, which is widely available as waste, can reduce waste and lower biodiesel production costs. Sunflower oil, although more expensive, has good physical and chemical properties for biodiesel, thus improving the quality when blended with other oils. These biodiesel blends were then mixed with HSD (Pertamina Dex) to produce B20, B35, and B100 fuels. Tests were conducted on a four-stroke diesel engine with lamp loads of 2000 watts, 3000 watts, and 4000 watts and engine speed variations of 1000 rpm, 1200 rpm, and 1400 rpm. The test results showed that B100 (100% multi-feedstock biodiesel) had the highest power and torque values at all variations, indicating the most optimal working performance. On the other hand, Pertamina Dex produced the lowest gsfc values at all variations, indicating the best fuel efficiency
STUDI NUMERIK PENGARUH RASIO DIAMETER SILINDER PENGGANGGU DI DEPAN RETURNING BLADE TURBIN ANGIN SAVONIUS MYRING n=1 DENGAN FIN
No full textA previous experimental study showed that additional fin with various diameter in front of returning blade of Savonius wind turbine with myring n=1 could increase its performance. However, flow visualization techniques like velocity contours, velocity Streamline and pressure contours couldn’t be seen. Therefore this research utilized Computational Fluid Dynamic (CFD) software with 3 dimensional model to visualize its flow and enhance the turbine performance. The study focused on the turbine with myring n=1. The additional fin diameter and height are 40 cm. The simulations were conducted with different variations of stagger diameter i,e. ds/D = 0.4 ; ds/D = 0.5; ds/D = 0.6; ds/D = 0.7. The wind speed was 6 m/s. Simulation were carried out to find out the best value of Coeficient of Torque (Ct), Coeficient of Power (Cp), and also visualize the turbine flow. The best result is in the cp value of 0.367 at tsr 0.8. It means that the turbine performance increases 11.59 % compared with no stagger on diameter variation of ds/D = 0.4
PERANCANGAN INSTALASI PEMBANGKIT ARUS MODULAR PADA TANGKI UJI ARUS-GELOMBANG MULTIFUNGSI
No full textA modular current generator is a device used to generate current in a test tank using pump as a fluid distributor. The flowing current in the test tank can be used to drive a water turbine to produce electrical energy. Research and testing on ocean waves and currents in Indonesia are still limited due to high cost. Based on these conditions, the design of a modular current generating device in a laboratory-scale wave-current test tank was carried out. Calculation was done first to determine its flow rate, pump specifications, and turbulent filter dimensions. Based on it, the design was carried out on a test tank with dimensions of 6 x 2 x 1.5m. The flow velocity is 0.02 m/s with a Reynolds number = 200000 including the transition flow from laminar to turbulent. The pump used is a centrifugal pump, KSB Etanorm 125-100-200, which can deliver fluid with a capacity of 170 m3/h, power of 5 kW and a rotation speed of 1450 rpm. The motor is KSB B3 Type Of Construction, 4-Pin 132 M with a power of 7.5 kW and a torque of 47.73 Nm. A honeycomb-shaped (hexagonal) turbulent filter was also installed to reduce the turbulent influence on the flow
PENINGKATAN UNJUK KERJA SEAPLANE PADA SAAT TAKE OFF
No full textA seaplane is a type of aircraft designed to operate both on water and on land. Similar to conventional airplanes, seaplanes undergo several processes before taking off, with takeoff being a critical moment influenced by various factors such as speed, runway length, center of gravity, and the aircraft\u27s lift capability. Since a seaplane uses water as its runway, this study investigates the addition of fins to the underside of the seaplane to potentially enhance its lift during takeoff on water and to observe the effects of adding a 100 kg engine on lift performance. The study utilizes Computational Fluid Dynamics (CFD) software with the Volume of Fluid (VOF) method, modeling two phases: water and air. Three models are analyzed: a seaplane with wings, a seaplane with wings and fins, and a seaplane with wings, fins, and an added 100 kg load. The simulation results indicate that the seaplane with the added fin has a significantly improved lift force compared to the seaplane without the fin, with an increase of 276% when in the water. Additionally, as the fin is submerged deeper into the water, the lift force generated also increases
Analisis Karakteristik Dan Engine Propeller Matching Pada Propeller DTMB 4119 Dengan Variasi Jumlah Blade Pada Kapal Combatant 142 Meter
No full textMaritime security issues in the 21st century require a DTMB (David Taylor Model Basin) 5415 combatant ship with complex armament, high speed and efficiency. minimizing energy consumption while generating appropriate power within the warship\u27s desired speed range. Propellers are a major component in warship design. The DTMB 4119 Propeller is selected as a modern type of Propeller because of its suitability for high-speed and high-efficiency ships. This study analyzes thrust, torque, and efficiency with variations in the number of blades. by using modeling software and Computational Fluid Dynamic (CFD) simulation software. Propeller comparison on variations of 3, 4 and 5 blades, to get propeller recommendations with the best results then look for Engine selection and calculate Engine Propeller Matching (EPM). Simulation results, the increasing number of blades with the same area, the greatest thrust and torque values are generated, namely 2302509.3 N and 2633061.6 Nm on 5 blades at J 0.83. Then, the greater the thrust or torque value, the better the propeller performance. For efficiency, the largest value is at 3 blades J 0.83 of 0.735. Then, the greater the thrust or torque value, the better the propeller performance. For efficiency, the largest value is at 3 blades J 0.83 of 0.735. in 4 engines selected with Twin screw 2 engines for speedan 18 kN patrol and 2 engines for a maximum speed of 27 kN
ANALISIS PROFITABILITAS DAN UKURAN PERUSAHAAN TERHADAP CORPORATE SOCIAL RESPONSIBILITY (CSR) DENGAN LEVERAGE
Full text linkIndustrial development in Indonesia is growing rapidly, causing intense competition. This phenomenon is also followed by social inequality and environmental damage due to excessive exploitation of natural resources. In this context, companies in the transport and logistics sector have an impact on the environment and health through air pollution, congestion, and noise, so the concept of Corporate Social Responsibility (CSR) emerged. This study aims to examine the effect of profitability and company size on CSR disclosure with leverage as a moderating variable in Transportation and Logistics Companies listed on the IDX during the 2020-2023 period. This study uses secondary data in the form of financial reports obtained from the company\u27s website. Purposive sampling was used in determining the sample and obtained by 20 companies. The analysis method to test the hypothesis is panel data regression analysis and MRA test. The results revealed that profitability and company size have an effect on CSR, which means that companies with high profitability tend to decrease CSR disclosure and larger companies are more likely to make wider CSR disclosures. Profitability moderated by leverage and firm size moderated by leverage have no effect on CSR because management\u27s focus on financial management, but still discloses CSR
ANALISIS STRUKTUR WHEELHOUSE AKIBAT PERUBAHAN UKURAN MASTHEAD PADA KAPAL SPOB 1500-KL
Full text linkPerubahan tinggi masthead pada SPOB (Self-Propelled Oil Barge) 1500-KL ditingkatkan dari 4525 mm menjadi 7200 mm untuk memenuhi persyaratan pemasangan lampu navigasi sesuai dengan konvensi peraturan internasional untuk mencegah tabrakan di laut COLREG (Convention on the International Regulations for Preventing Collisions at Sea). Modifikasi ini meningkatkan beban statis pada struktur wheelhouse, sehingga diperlukan evaluasi terhadap integritas strukturnya. Studi ini menganalisis respons struktural wheelhouse sebelum dan sesudah perubahan ketinggian masthead untuk menentukan apakah desain yang ada masih berada dalam batas aman. Analisis numerik dilakukan menggunakan MEH (Metode Elemen Hingga) dengan perangkat lunak Fusion 360. Simulasi dilakukan untuk dua konfigurasi ketinggian masthead 4525 mm (awal) dan 7200 mm (modifikasi) dengan beban angin dari arah depan, belakang, dan samping kapal. Hasil menunjukkan peningkatan tegangan yang signifikan setelah perubahan ketinggian masthead. Pada desain awal, nilai tegangan di semua kondisi masih berada dalam batas aman. Namun, pada kondisi yang dimodifikasi, tegangan maksimum mencapai 215,035 MPa di bawah beban angin dari depan, 187,769 MPa dari belakang, dan 140,255 MPa dari samping. Nilai-nilai ini menunjukkan bahwa struktur tidak aman terhadap beban angin dari arah depan dan belakang. Studi ini menyoroti dampak langsung perubahan ketinggian masthead terhadap kekuatan wheelhouse dan dapat menjadi referensi untuk evaluasi struktural lebih lanjut, termasuk kemungkinan penambahan kekuatan atau redesain