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All Journal Jupiter Machine : Jurnal Teknik Mesin Indonesian Physical Review International Journal of Marine Engineering Innovation and Research Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Edutik : Jurnal Pendidikan Teknologi Informasi dan Komunikasi Jurnal Bluefin Fisheries Jurnal Airaha Prosiding Seminar Nasional Teknologi Industri Berkelanjutan Edutik : Jurnal Pendidikan Teknologi Informasi dan Komunikasi
Ahmad Ilham Ramadhani
Politeknik Kelautan Dan Perikanan Bitung
Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation Other

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PENGARUH KOMPOSISI CU-ZN TERHADAP TINGKAT KEKERASAN DAN STRUKTUR MIKRO ALUMINIUM DIE CASTING (ADC) 12 SEBAGAI BAHAN PROPELLER Ahmad Ilham Ramadhani; Barokah Barokah; Fahriadi Pakaya; Jozua Ch. Huwae; Marinus S. Tappy; Andie Murtono; Ahmad Tubagus Tsani Risqi Aji
JURNAL BLUEFIN FISHERIES Vol 3, No 2 (2021)
Publisher : Politeknik Kelautan dan Perikanan Bitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (386.352 KB) | DOI: 10.15578/jbf.v3i2.114

Abstract

Propeller is one of the important components of a ship. Generally, propellers are made of aluminum which is easily damaged when hit by waves and corrosion. The development is done by adding brass (Cu-Zn) on ADC 12. The sample was successfully made with a ratio of 70% ADC 12 : 30% Cu-Zn using the casting method and then cooled at room temperature followed by die casting and sand casting processes. The sample was tested for hardness using the Rockwell method according to the ASTM E18 standard and the microstructure test on the sample. Based on the test results obtained an average hardness level of 72.6 HRC and the formation of Al-Si-Mg, α-Al, Cu, Zn in the sample which shows the distribution of non-ferrous material in ADC-12. Keywords : ADC 12; Cu-Zn; propeller; microstructure; hardness
Analisa Kekuatan Tarik dan Kekuatan Impact Propeller Alumunium Die Casting (ADC) 12 dengan Penambahan Cu-Zn Ahmad Ilham Ramadhani; Barokah Barokah; Fahriadi Pakaya; Jozua Ch. Huwae; Marinus S. Tappy; Andie Murtono; Ahmad Tubagus Tsani Risqi Aji
Jurnal Airaha Vol 11 No 01: June 2022
Publisher : Politeknik Kelautan dan Perikanan Sorong, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (483.642 KB) | DOI: 10.15578/ja.v11i01.320

Abstract

Propeller kapal nelayan umumnya terbuat dari aluminium yang mudah mengalami kerusakan pada saat dihantam batu karang, ombak dan mengalami korosi. Maka dilakukan pengembangan dengan penambahan kuningan (Cu-Zn) terhadap material propeller ADC 12. Spesimen berhasil dibuat dengan penambahan 30% Cu-Zn pada ADC 12 dengan menggunakan metode pengecoran yang dilanjutkan pencetakan dengan metode die dan sand casting. Spesimen ADC 12 dan paduan ADC 12+CuZn diuji tarik dan impak sesuai standard ASTM E8 dan ASTM E23 untuk mengetahui perubahan sifat mekanik material tersebut. Berdasarkan hasil pengujian tarik diperoleh bahwa adanya unsur Cu-Zn menurunkan kekuatan tarik ADC 12 (141 MPa) dan paduan ADC 12+CuZn (55,1 Mpa). Hasil pengujian kekuatan impact menunjukkan tingkat kekuatan impact kekerasan rata-rata ADC 12 (15,61 joule) dan paduan ADC 12+CuZn (15,98 joule).
Studi Pengaruh Jenis Minyak Nabati terhadap Campuran Bioresin Vinil ester-Minyak Nabati Eli Novita Sari; Ahmad Ilham Ramadhani; Jauharotul Maknunah
Prosiding SENASTITAN: Seminar Nasional Teknologi Industri Berkelanjutan Prosiding SENASTITAN Vol. 01 2021
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (551.973 KB)

Abstract

Minyak nabati merupakan alternatif untuk mengganti minyak mineral dan bahan kimia, karena minyak nabati bersifat biodegradable, tidak beracun, ramah lingkungan, dan dapat diperbarui. Penelitian ini akan mengembangkan bioresin yang merupakan campuran dari polimer vinil ester dengan polimer alam berupa minyak nabati. Hasil dari pengujian bioresin dengan variasi minyak nabati yang meliputi minyak sawit, minyak kelapa, minyak kedelai, dan minyak wijen didapatkan hasil bahwa bioresin vinil ester dengan pengisi minyak sawit (VE-MS) dan minyak wijen (VE-MW) memiliki properti teroptimum. Nilai kekerasan VE-MS 76 HD dan VE-MW 75 HD, nilai kekuatan tarik VE-MS 42 Mpa dan VE-MW 45 Mpa, nilai pertambahan panjang VE-MS 24% dan VE-MW 20%, nilai kekuatan tekuk VE-MS 73 Mpa dan VE-MW 89 Mpa, massa jenis VE-MS 1,004 g/cm3 dan VE-MW 1,003 g/cm3.
The Phenomenon of Biodiesel Heating: Its Effect on Viscosity, Density, and Emission Barokah Barokah; Semin Semin; Beny Cahyono; Bambang Sampurno; Ahmad Ilham Ramadhani; M. Bintang Fikri
International Journal of Marine Engineering Innovation and Research Vol 7, No 4 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v7i4.14827

Abstract

Biodiesel fuel is a mixture of diesel oil mixed with vegetable oil (palm). The composition of the mixture affects its properties, especially viscosity and density. The research was conducted to determine the effect of increasing temperature on these properties. By applying several experimental methods, including the ASTM D 445-95 method, the pycnometer method, and the particulate emission test method. The biodiesel test was carried out with variations in temperature of 30oC, 40oC, 50oC, 60oC, and 70oC at room conditions of 24.0oC temperature and 71% humidity. From the temperature variation, the viscosity is 2.23 cSt, 2.61 cSt, 3.1 cSt, 3.7 cSt, and 4.45 cSt. The results of the research prove that the increase in biodiesel temperature affects decreasing viscosity and density which has an impact on reducing particulate emissions.
Prototipe Perahu Listrik: Pengaruh Ukuran Propeller Terhadap Resistance dan Power Pada Software Maxsurf Resistance Ahmad Ilham Ramadhani; Dwi Dharma Arta Kusuma; Andie Murtono; Ahmad Tubagus Tsani Risqi Aji
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 4, Nomor 3, Edisi November 2023
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v4i3.30775

Abstract

The boat model as a prototype of an electric boat has been successfully modeled and simulated using Maxsurf software. The research aims to determine the resistance and power values of the boat when operating using the Holtrop method. The Pakura boat was modeled using a Maxsurf modeler and simulated using Maxsurf resistance. Based on the modeling results, it shows that the boat model corresponds to the main dimensions in real conditions. The Pakura boat model has a displacement of 320.5 kg, amidship and immersed draft of 0.25 m, and a wetted area of 2.94 m2. The resistance and power are calculated using the resistance and power holotrop methods. Based on the simulation results, we obtained a prototype model of an electric boat that can operate on a certain propeller size. The maximum speed of the electric boat prototype with a 7-inch propeller is 4.31 kn. At 1500 rpm, the boat receives an HR of 92.71 N and requires a power of 205.57 W. On an 8-inch propeller that is 4.82 kN. At 1500 rpm, the boat receives an HR of 121.83 N and requires a power of 302.08 W. The size of the propeller affects the resistance value and power of the boat. The resistance value of the boat and operating power requirements increase along with changes in rpm on the electric engine. This can be used as a reference in determining the propulsion components for an electric boat prototype.
Penggunaan Metode Waterfall pada Website Polytechnic Integrated Online System W, Wasum; Murtono, Andie; Dharma Arta Kusuma, Dwi; Ilham Ramadhani, Ahmad; Tubagus Tsani Risqi Aji, Ahmad; H. Ndahawali, Daniel
JUPITER (Jurnal Penelitian Ilmu dan Teknologi Komputer) Vol 17 No 1 (2025): Jurnal Penelitian Ilmu dan Teknologi Komputer (JUPITER)
Publisher : Teknik Komputer Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In today's digital era, the use of information technology (IT) in public services is a must. One of the implementations is the use of websites in public services. This website is designed to improve information accessibility services to the public (users), making it easier for people to access public services at the Marine and Fisheries Polytechnic of Bitung without having to come to the office. Other benefits that have been felt include more transparent services, the public can see the status of services in real time and help increase campus accountability. In this research, in developing the website, the author used the Waterfall method. The reason for using it is that the stages of work are sequential, interrelated, and easy to develop. After implementing the Waterfall method on the Polytechnic Integrated Online System (PIOnS) website, the results show that it can save time and costs when using public services, accurate, effective, fast, realtime, accountable, and more useful. The next result is that on the PIOnS website there are five types of services, namely Basic Safety Training (BST), Air Blast Freezer (ABF)/Cold Storage, Ship Docking, Ship Machinery Workshop and Training Ship Fleet.
EVALUASI TORSI ELECTRIC ENGINE PROTOTIPE PERAHU LISTRIK NELAYAN MENGGUNAKAN METODE PRONY BRAKE Ramadhani, Ahmad Ilham; Murtono, Andie
Machine : Jurnal Teknik Mesin Vol 11 No 2 (2025): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Sains dan Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/t7gczp80

Abstract

Fishing boat technology utilizing an electric motor drive system has been developed as one of the innovations in marine vehicle design. Electric boats can move using the torque force generated from the electric motor to rotate the motor shaft, which is connected to the propeller. The aim of this research is to evaluate the torque force produced by an electric engine using the prony brake method. The research method employed was an experimental approach, focusing on variations in load, external diameter of the motor shaft pulley, and motor rotation. The results of experimental calculations show that the prony brake test can be used as an instrument in the approach method for calculating torque. The torque value is influenced by the pulley diameter and load variations. The largest torque value for variations in load and pulley diameter is at a pulley diameter of 3 inches and a load of 8 kg, namely 3.10 Nm. Changes in motor shaft rotation (rpm) affect the increase in torque. The largest torque value in the rotation variation is at 800 rpm and a load of 8kg for each diameter variation; 4.31 Nm (2 inches), 5.34 Nm (2.5 inches), 6.46 Nm (3 inches). The torque obtained is used as a reference in determining the capabilities of the electric engine and the capabilities of the fishing boat prototype while operating at sea.
Mapping the Implementation of Maxsurf Software to Marine Vehicle Simulation Ramadhani, Ahmad Ilham; Murtono, Andie; Halimi, Ahmad Dzulfikri
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 6, Number 3, November 2025 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.vi.46119

Abstract

Maxsurf software is a software that can help in simulating modeling aspects, especially marine vehicles. However, the modeling is still limited to large-dimensional marine vehicles. The aim of this study was to map the potential use of Maxsurf software as a simulation tool for small marine vessels used by fishermen. The mapping was conducted by reviewing articles related to Maxsurf's use based on its modeling, resistance, and stability.The research method used is a Publish or Perish literature search and VOSviewer bibliometric analysis. Articles on the use of Maxsurf software from 2015-2025 were obtained from international journals indexed by Google Scholar and Scopus, with the main keyword Maxsurf. The search results on Publish or Perish obtained 42 articles related to the use of maxsurf on large-dimension ships. The distribution of maxsurf use is found in 42 articles with 7 articles (2022 and 2021), 6 articles (2025, 2023, and 2020), 3 articles (2018), 4 article (2024), and 1 article (2019, 2016, and 2015). The general topic studied in the research is design analysis with the most frequently used maxsurf, namely the combination of maxsurf modeller – resistance in 18 article. Research trends are visualized using VOSviewer with the relationship between research topics and keywords. There are 6 main clusters, including; cluster 1 (12); cluster 2 (5); cluster 3 (2); cluster 4 (9); cluster 5 (10); cluster 6 (11). This phenomenon shows that the distribution of topics is still low by looking at the research trend which has decreased over the past 10 years.
EFFECT OF CALCINATION TEMPERATURE ON F-DOPED LiFePO4 CATHODE MATERIAL ON FORMATION OF OLIVINE PHASE Ramadhani, Ahmad Ilham; Noerochim, Lukman; Susanti, Diah; Sari, Eli Novita
Indonesian Physical Review Vol. 4 No. 3 (2021)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v4i3.99

Abstract

Olivine single phase of LiFePO4 was successfully synthesized by solid-state reaction (SSR) method through the formation of Fe2P2O7 from precursors of Li2CO3, F2O3, NH4H2PO4, and LiF as materials doping. Variations at temperatures of calcination 670 0C, 700 0C and 750 0C with doped 0.1F. TGA-DSC test results show that the LFP sample undergoes decomposition in the temperature range 0-600 0C. The olivine phase formed at temperatures of more than 650 0C and the oxidation process on the LiFePO4/C sample was completed, and the sample mass was constant. The olivine phase formed was determined by comparing the 2𝜃 value obtained through characterization with the ICDD LFP (01-081-1173), and accordingly with experiment. The increase of the temperature results from a dominant LFP phase with a larger grain size. The effect of increasing the calcination temperature at 0.1F has resulted in an enlargement of the particle size.
Prototipe Pemanasan Bahan Bakar Biosolar B30 Menggunakan Arduino Aji, Ahmad Tubagus Tsani Risqi; Rompas, Parabelem Tinno Dolf; Daud, Metsi; Kusuma, Dwi Dharma Arta; Ramadhani, Ahmad Ilham
Edutik : Jurnal Pendidikan Teknologi Informasi dan Komunikasi Vol. 4 No. 6 (2024): EduTIK : Desember 2024
Publisher : Jurusan PTIK Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/edutik.v4i6.10936

Abstract

ABSTRAK Salah satu pengganti bahan bakar fosil adalah biosolar, dimana bahan bakar yang diperoleh dari sumber daya biologis, seperti minyak nabati dan lemak hewani. Salah satu untuk meningkatkan efisiensi dari biosolar dengan cara mengkonsumsi diatas suhu 25 0c. Untuk itu dibuatlah penelitian yaitu sebuah prototipe pemanas bahan bakar yang diatur oleh mikrokontroller arduino uno dengan menggunakan sensor DS18B20, pemanas heater dan relay. Percobaan dilakukan dengan memanaskan bahan bakar biosolar B30 sebanyak 700 ml dalam tabung berukuran diameter 16,5 cm dan tinggi 20 cm pada suhu awal 30 0C. Pengujian prototipe pemanas dilakukan dengan suhu 35 0C, 40 0C, 450C, dan 50 0C. Dari hasil percobaan terdapat persentase selisih ushu sebesar 5.71 %, 4.25%, 2.89 %, dan 1.62 %. ABSTRACT One alternative to fossil fuels is biodiesel, which is fuel derived from biological resources such as vegetable oils and animal fats. One way to improve the efficiency of biodiesel is by consuming it at temperatures above 25°C. To achieve this, a study was conducted to develop a fuel heating prototype controlled by an Arduino Uno microcontroller using a DS18B20 temperature sensor, a heater, and a relay. The experiment involved heating 700 ml of B30 biodiesel fuel in a cylindrical container with a diameter of 16.5 cm and a height of 20 cm, starting at an initial temperature of 30°C. The heating prototype was tested at temperatures of 35°C, 40°C, 45°C, and 50°C. The experimental results showed temperature deviation percentages of 5.71%, 4.25%, 2.89%, and 1.62%, respectively.
Co-Authors Ahmad Dzulfikri Halimi Ahmad Tubagus Tsani Risqi Aji Ahmad Tubagus Tsani Risqi Aji Ahmad Tubagus Tsani Risqi Aji Aji, Ahmad Tubagus Tsani Risqi Aji, Ahmad Tubagus Tsani Risqi Andie Murtono Andie Murtono, Andie Bambang Sampurno Bambang Sampurno Barokah Beny Cahyono Cahyono, Beny Daud, Metsi Dharma A.K, Dwi Dharma Arta Kusuma, Dwi Diah Susanti Dwi Dharma Arta Kusuma Dwi Dharma Arta Kusuma Eli Novita Sari Faisal Riza, Faisal Ginto, Louis A. H. Ndahawali, Daniel Heru Santoso Irawan, R. Agung Jauharotul Maknunah Jozua Ch. Huwae Kusuma, Dwi Dharma Arta Kusuma, Dwi Dharma Arta Lukman Noerochim M. Bintang Fikri Marinus S. Tappy Metsi Daud Metsi Daud1 Mohammad Bintang Fikri Muhammad Z. Arifin Pakaya, Fahriadi parabelem tinno dolf rompas Parabelem Tino Dolf Rompas Risqi Aji, Ahmad Tubagus Tsani Rompas, Parabelem Tino Dolf Sari, Eli Novita Semin Semin Semin Tauladhani, Saeful A. Tubagus Tsani Risqi Aji, Ahmad Tumewu, Gregorio A. Wasum