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STUDI NUMERIK ALIRAN TAYLOR VORTEX TURBULENT DENGAN PENGARUH GRADIEN TEMPERATUR Iman Pradana A. Asssagaf; Rizki Ilmal Yaqin; Angger Bagus Prasetiyo
Journal of Energy, Materials, & Manufacturing Technology Vol 1 No 01 (2022): Journal of Energy, Materials, & Manufacturing Technology
Publisher : Unit Penelitian, dan Pengabdian Masyarakat (UPPM) Politeknik ATI Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61844/jemmtec.v1i01.149

Abstract

Pola aliran dan torsi pada Taylor vortex turbulent dengan perpindahan kalor  telah diteliti menggunakan metode numerik. Parameter geometri pada penilitian dengan radius ratio 0, 714 dan aspect ratio 10 dengan bilangan Taylor  2463 - 9852 serta  dan . Hasil penelitian menunjukan bahwa vortex turbulent berupa aliran yang terjadi secara tidak teratur namun garis vortexnya masih ada dan turbulensi makin kuat ketika seiring dengan peningkatan putaran silinder dalam. Semakin tinggi bilangan Nusselt rata-rata dari dinding silinder bagian dalam menunjukkan abiliti perpindahan kalor yang lebih kuat. Peningkatan torsi atas pengaruh putaran silinder pada daerah aliran,kenaikan torsi gesekan dipengaruhi oleh sel-sel vortex pada aliran turbulent.
ANALISA HASIL PENGELASAN PADA POSISI 1G BAJA ST37 DENGAN METODE FAULT TREE ANALYSIS Iman Pradana A Assagaf; Ariyanto; Nurhidayat; Rizki Ilmal Yaqin; Angger Bagus Prasetiyo
Steam Engineering Vol. 5 No. 1 (2023): STEAM Engineering, Vol. 5, No. 1, September 2023
Publisher : Program Studi Pendidikan Teknik Mesin, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37304/jptm.v5i1.10857

Abstract

Welding is an important process in the manufacturing, metal and machinery industries, the welding results of students in the 1G Steel ST7 position are studied with the aim of identifying potential weld defects, determining root causes, evaluating and developing repair strategies to improve overall welding quality. The methods used in this research are qualitative and quantitative methods. Measuring welding dimensions with visual weld inspection, as well as liquid penetrant testing to identify weld defects. The data is processed using a Pareto diagram to determine the dominant types of defects that occur in the welding process. Once the dominant defect type is known, analysis is then carried out using the Fault Tree Analysis method. The results of the liquid penetrant test show that there are 8 types of weld defects with a total of 62 defects. In the FTA, basic events have been identified that contribute to the occurrence of weld defects, namely factors such as welding speed instability, incorrect current settings, and moist electrode. Regular evaluation, continuous monitoring and supervision during the welding process to reduce the risk of defects and improve welding quality
PERBAIKAN KEKERASAN DAN STRUKTUR MIKRO LOGAM KUNINGAN SEBAGAI BAHAN PROPELLER DENGAN METODE SHOT PEENING Margono Margono; Yanti Pasmawati; Nugroho Tri Atmoko; Rizqi Ilmal Yaqin; Bambang Hari Priyambodo
Jurnal Teknologi Terapan Vol 9, No 2 (2023): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v9i2.431

Abstract

Brass metal is widely used as a supporting equipment material, one of which is a propeller. The propeller itself is one component of the boat that rotates and produces thrust energy. The continuous use of propellers results in degradation or a decrease in quality and service life. The degradation of the propeller is affected by the hardness, toughness, and corrosion resistance of the working environment. To improve the quality of the propeller, shot peening treatment was carried out on its surface. Shot peening is a continuous shooting process with fine particles in the form of steel balls on the surface of the object. Shot peening can increase the density of the microstructure and produce compressive residual stress which causes the surface hardness to also increase. Shot peening is carried out with variations in duration of 2, 4, 6, 8, and 10 minutes, 100 mm shooting range, and 7 Bar firing pressure. The steel ball particles used have a hardness of 40-50 HRC and a diameter of 5 mm. The results of the hardness test showed an increase in the surface hardness of the spesimens for a duration of 2, 4, 6, 8, and 10 minutes, respectively 189, 294, 302, 324, 330, dan 341 HV. The microstructure of the spesimen after shot peening looks tighter and denser. The highest hardness value is 341 HV or an increase of 80% compared to raw material.
Pengaruh Perbedaan Mesh Terstruktur dan Mesh Tidak Terstruktur Pada Simulasi Sistem Pendinginan Mold Injeksi Produk Plastik Angger Bagus Prasetiyo; Fauzun; Azhim Asyratul Azmi; Didit Setyo Pamuji; Rizqi Ilmal Yaqin
Retii Prosiding Seminar Nasional ReTII Ke-14 2019
Publisher : Institut Teknologi Nasional Yogyakarta

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

Abstract

Determination of the type of mesh and mesh manufacturing density plays a very important role in a simulation, this is due to minimize the time and computational costs. This study presents a comparison of the influence of mesh on CFD analysis. Mesh is the most important part in doing a simulation. Mesh is good, affects the calculation results of a simulation. To simulate internal flow in injection molding cooling channels to make it more accurate. There are three types of mesh that are applied in a simulation of this study, namely: hexahedral, polyhedral, and tetrahedral mesh are applied to simulate the internal flow of cooling channel injection molding using the k-epsilon turbulence model. Simulation results show that the simulation method using the polyhedral mesh is proposed to be able to speed up calculations and accelerate the convergence of the simulation as evidenced by an iteration graph. The use of polyhedral mesh in CFD simulations is more effective than using tetrahedral or hexahedral mesh. However, the use of hexahedral mesh simulation results is closer to the experiment and requires a long iteration time. In addition, the result is polyhedral mesh requires less computational time than hexahedral mesh and tetrahedral mesh. Using polyhedral mesh in CFD was found to be more effective than using tetrahedral elements.
Pendekatan Model Empiris untuk Prediksi Kehilangan Berat dan Laju Korosi AISI 304 pada Media Air Laut Rizqi Ilmal Yaqin; Mega Lazuardi Umar; Bambang Hari Priyambodo; Sugeng Slamet; Miftakhur Rohmah
Jurnal Metal Indonesia Vol 45, No 2 (2023): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32423/jmi.2023.v45.48-59

Abstract

Penelitian sebelumnya telah melakukan evaluasi menggunakan pendekatan empiris untuk prediksi korosi pada baja karbon rendah dan baja paduan rendah. Namun, hingga saat ini belum ada penelitian serupa yang dilakukan untuk baja tahan karat. Oleh karena itu, tujuan dari penelitian ini adalah menerapkan persamaan matematis guna mendapatkan model sederhana yang dapat digunakan untuk mengevaluasi laju korosi pada baja tahan karat akibat korosi air laut. Dalam penelitian ini, bahan yang digunakan adalah baja tahan karat komersial 304. Pengkajian sifat fisiokimia bahan ini meliputi analisis komposisi kimia, struktur mikro, serta sifat mekanik seperti kekuatan tarik dan kekerasan berasal dari speifikasi produk. Metode pengurangan berat digunakan untuk mengukur tingkat korosi, dilanjutkan dengan penerapan persamaan prediksi penurunan kehilangan berat. Analisis korosi selanjutnya didapatkan dari plotting kehilangan berat yang kemudian dikonfirmasi dengan pengukuran kualitas air laut dalam eksperiment dan foto makro. Hasil penelitian menunjukkan bahwa model dan eksperimen memiliki persentase kesalahan terbaik saat waktu perendaman mencapai 600 jam. Selain itu, persamaan model laju korosi menunjukkan kecenderungan yang mendekati hasil eksperimen dengan bertambahnya waktu perendaman. Dengan demikian, penggunaan pendekatan empiris dalam prediksi kehilangan berat dan laju korosi pada baja tahan karat memberikan kontribusi alternatif yang berharga dalam memperkirakan laju korosi pada jenis bahan ini. Selain itu, penggunaan model empiris ini juga mampu memprediksi laju korosi stainless steel di lingkungan laut, sehingga dapat dijadikan pertimbangan dalam merancang alternatif desain dengan material tersebut AbstractEvaluation of the use of an empirical approach for corrosion prediction has been carried out on low carbon and low alloy steels, but it still limited for stainless steel. The aim of this research is applying a mathematical equation to obtain a simple model, so that it can evaluate the corrosion rate of stainless steel due to seawater corrosion. Commercial stainless steel 304 was used as the tested material. The physiochemical properties in terms of chemical composition and microstructure as well as mechanical properties which are tensile strength and hardness were evaluated. The weight loss method is used for corrosion rate measurement, and further applicate to the the weight loss prediction equation. Corrosion analysis was obtained from plotting weight loss confirmed by water quality measurements and photo macro. The results of weight loss by model and experiment have the best percentage error at immersion time of 600 hours. Meanwhile, the equation for the corrosion rate model has a trend closer to the experimental results with increasing immersion time. The use of empirical approachment for weight loss prediction on the stainless steel can provide the alternative contribution for its corrosion rate prediction, especially in the marine environment. These results can be an alternative design consideration for future.
Effect of cooling media on hardness and microstructural changes in S45C carbon steel during heat treatment process Bambang Hari Priyambodo; Reni Laili; Rizqi Ilmal Yaqin; Suhartoyo Suhartoyo
Jurnal POLIMESIN Vol 21, No 3 (2023): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i3.3846

Abstract

S45C Carbon steel is commonly used in the manufacturing of structural or machine components due to its numerous advantages. However, to fulfill its intended purpose, the mechanical properties of this material require improvement. One approach to achieve this is through heat treatment using different cooling fluids. Therefore, this study aimed to examine the effect of varying cooling fluids on heat treatment of S45C carbon steel, specifically its hardness and microstructure changes. The experimental method employed involves heating the specimens in a furnace at 850oC for 30 minutes, followed by cooling using different fluids, namely water, ice water, and oil. The results showed that faster cooling led to an increase in hardness. In particular, the specimens cooled using water, ice, and oil yielded hardness values of 697 HV, 481 HV, and 248 HV, respectively. The highest hardness value of 697 HV was achieved using ice water, indicating an increase of around 281%. The phase changes observed on the surface of the specimen showed the dominance of martensite.
Rekayasa Peningkatan Kekerasan Permukaan Gear Sprocket Sepeda Motor dengan Metode Quenching Variasi Media Pendingin Rauuf Nur Fattah; Sugiyanto Sugiyanto; Bambang Hari Priyambodo; Achmad Nurhidayat; Rizqi Ilmal Yaqin
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol 5, No 1 (2023): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v5i1.19418

Abstract

This study used an experimental research method, which is a research method that aims to understand the causal process by treatment and conducting controlled testing on a sample of research subjects. This research uses quantitative methods by taking research data in the form of numbers. The material used in this study is the gear sprocket. A gear sprocket is a motor component that transmits power from the engine to the rear wheels so that the motor can run optimally. The sprocket gear was heat treated at 850 ℃ with a holding time of 20 minutes. The variations of quenching media are mineral water, dromus coolant, and SAE 40 oil. Hardness and microstructure tests were carried out for each specimen to determine the effect of different cooling media on the quenching process. The results of this study indicate the highest specimen hardness value was obtained at 301 HV by immersion in mineral water media. The lowest hardness was obtained at 207 HV with SAE 40 oil media immersion. Meanwhile, the non-treatment material hardness is 150 HV. In this case, there was an increase in the highest hardness of about two times compared to non-treated specimens. Observation of the microstructure shows that the grain size of the mineral water quenching specimens looks smaller than that of the non-treatment models. This phenomenon supports the idea that quenching can increase the surface hardness of the gear sprocket.
Theoretical Evaluation of Fuel Consumption in Fishing Vessel Machinery Yaqin, Rizqi Ilmal; Anjaska, Riski; Demeianto, Bobby; Siahaan, Juniawan Preston
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 3 (2024): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i3.62863

Abstract

Fuel serves as a crucial element in the operations of fishing businesses employing boats. Presently, the usage of fuel in ships remains significant, yet it lacks thorough mathematical and theoretical assessment. This research aims to evaluate, both mathematically and theoretically, the fuel consumption of fishing vessels during their fishing endeavors. The study involved observations of various aspects, such as engine types, fuel types, and fuel flow, on fishing vessels. Fuel consumption was computed based on operational hours and RPM (Revolutions Per Minute) of diesel engines onboard ships. The findings revealed that engines with identical loads exhibited varying fuel consumption rates due to differences in cylinder volume. Additionally, fuel consumption increased with higher RPM. Fluctuations in fuel consumption during fishing operations were attributed to adjustments made by vessels according to environmental and situational factors. Theoretical and mathematical analyses indicated that several factors, including operational hours, RPM, and cylinder volume, influence fuel consumption in diesel engines of fishing vessels. This study's significance lies in providing insights into the theoretical and mathematical aspects of predicting fuel consumption in diesel engines utilized in fishing vessels.
Analisa Kegagalan Motor Penggerak Generator Set Pada Kapal Penangkap Ikan Priharanto, Yuniar Endri; Yaqin, Rizqi Ilmal; Sihombing, Nasib; Siahaan, Juniawan Preston
JURNAL ILMIAH MOMENTUM Vol 20, No 1 (2024)
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/jim.v20i1.8507

Abstract

Penggunaan metode root cause failure analysis (RCFA) telah banyak digunakan untuk mengidentifikasi akar penyebab kegagalan, namun penerapan secara spesifik dalam mengevaluasi dan menilai penyebab kegagalan pada motor penggerak generator set di kapal penangkap ikan belum banyak digunakan sehingga mengalami kegagalan yang berulang-ulang. Berdasarkan hal itu penelitian ini  bertujuan dari artikel ini adalah mengevaluasi dan menganalisis penyebab komponen pada motor penggerak generator yang mengakibatkan kegagalan pada generator kapal penangkap ikan dengan pendekatan RCFA. Objek penelitian ini adalah Kapal penangkap ikan di Wilayah Pati, Jawa tengah yang merupakan Kapal Penangkap Ikan dengan alat tangkap purse seine yang memiliki generator set dengan kapasitas 50 kVA. Data kerusakan diambil dan  diidentifikasi akar penyebab kegagalan menggunakan RCFA sehingga mendapatkan proses rekomendasi perbaikan dan perawatan generator set. Berdasarkan hasil fishbone didapatkan 7 faktor yang sering menjadi penyebab. Namun, analisis yang dilakukan menghasilkan patahan komponen crank shaft pada mesin penggerak generator set pada kapal penangkap ikan disebabkan oleh pembebanan listrik yang berlebih. Berdasarkan hasil Rekomendasi perbaikan meliputi penggantian suku cadang crank shaft dan perubahan SOP pembebanan listrik pada generator set di kapal penangkap ikan. Kontribusi dari penelitian ini yaitu memberikan informasi terkait penyebab kegagalan crank shaft dan cara mengatasi dan rekomendasi perbaikannya
Penerapan SHERPA untuk Identifikasi Kinerja dan Human Error Pengoperasian Mesin Induk Kapal Penangkap Ikan Yaqin, Rizqi Ilmal; Septianda, Devin; Priharanto, Yuniar Endri; Abrori, M. Zaki Latif
Jurnal Rekayasa Sistem Industri Vol. 13 No. 1 (2024): Jurnal Rekayasa Sistem Industri
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26593/jrsi.v13i1.6681.91-106

Abstract

Occupational accidents due to human errors in the operation of main engines on fishing vessels need to be considered because they can be fatal to the ship. This study aims to identify and analyze critical activities in the operation of fishing vessel main engines using the Systematic Human Error Reduction And Prediction Approach (SHERPA) method. The analytical method is to collect data by observation and interviews to fulfill the SHERPA tabulation. SHERPA analysis is closely related to using Hierarchial Task Analysis (HTA) diagrams to determine the amount of activity generated in the operation of fishing vessel main engines. In addition, work intensity analysis is applied to determine the stages that need to be considered in the operation of the main engine. Based on the resulting analysis, the highest work intensity is at the operating stage of the main engine. At the same time, the critical activity level is in closing the fuel faucet and the cooling system water faucet, which are included in the activity category of turning off the main engine. The findings of this study provide insight into handling critical activities in the operation of the main engine so that a strategy is needed to reduce human error in operation. The strategy for reducing this activity is strictly supervising and modifying or adding tools to make it easier for operators. The investigation results can inform the intensity and critical points of human error in the operation of fishing vessel main engines to reduce the occurrence of work accidents.
Co-Authors A Marsha Alviani Abrori, M. Zaki Latif Achmad Nurhidayat Ade Hermawan Adian Febriyanto Ahmad Adib Ahmad Arbi Trihatmojo Ahmad Kurniawan Alfakhri Alfakhri Alip, Ahmad Angger Bagus Prasetiyo Anjaska, Riski Aqshal Ilham Fadiga Ariyanto Atmoko, Nugroho Tri Azhim Asyratul Azmi Azhim Asyratul Azmi Azhim Azyratul Azmi Bagas Prakoso Bambang Hari Priyambodo Bambang Hari Priyambodo Bambang Imawan Barokah Bobby Demeianto Bobby Demeianto Bobby Demeianto Bobby Demeianto Boby Wisely Ziliwu Boby Wisely Ziliwu Boby Wisely Ziliwu Demeianto Bobby Demeianto, Bobby Didit Setyo Pamuji Fajar Miftakhul Rizqy Fauzun Fauzun Fauzun Febi Luthfiani Finali, Asmar Hafiz Ziddin Hamdu Azrawi Daulay Hanafi, Agung Fauzi Henry Iskandar Madyantoro I Gusti Ngurah Agung Satria Prasetya Dharma Yudha I Ketut Suada Iman Pradana A Assagaf Iman Pradana A. Asssagaf Iskandar Musa Iskandar Musa Iwed Mulyani Juniawan Preston Siahaan Juniawan Preston Siahaan Juniawan Preston Siahaan Juniawan Preston Siahaan Kacuk Cikal Nugroho Kenny Bastian Lagsmana, Tegar M. Subroto Alirejo Margono Margono Mariandri Pasaribu Mega Lazuardi Umar Miftahul Huda Miftakhur Rohmah Mohamad Akmal Muhammad Ali Rozaki Muhammad Noor Asnan Muhammad Nur Arkham Mula Tumpu Mula Tumpu Nasib Sihombing Nirmala Efri Hasibuan Nirmala Efri Hasibuan Nurhidayat Pakpahan, Binsar Maruli Tua Pamaharyani, Luchiandini Ika Perdana Putra Kelana Prabuditya Bhisma Wisnu Wardana Priharanto, Yuniar Endri Pristiansyah, Pristiansyah Rangga Bayu Kusuma Haris Ratih Purnama Sari Rauuf Nur Fattah Reni Laili Rochmad Eko Prasetyaning Utomo Roma Yuli Hutapea Rudi Efendi Santi Yatnikasari Septianda, Devin Siahaan Juniawan Preston Siahaan, Juniawan Preston Sigiet Haryo Pranoto Sigit Haryo Pranoto Sihombing, Nasib Sugeng Slamet Sugiyanto Sugiyanto Suhartoyo Suhartoyo Syauqiy Ridlo Robbiy Taufan Mahendra Tumpu Mula Yanti Pasmawati Yuniar Endri Priharanto Zamri Zamri Zamri