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Jurnal Teknologi dan Riset Terapan (JATRA)
Published by Politeknik Negeri Batam
ISSN : 26854910     EISSN : 26854910     DOI : -
Core Subject : Science, Engineering,
Aerospace Engineering Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering
Jurnal Teknologi dan Riset Terapan (JATRA) is scientific, peer-reviewed and open access journal managed and published by Research and Community Services, Politeknik Negeri Batam. The journal is published two times a year on June and December. Jurnal Teknologi dan Riset Terapan (JATRA) provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 96 Documents
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STUDI PERBANDINGAN CUT QUALITY PADA VARIASI CUTTING SPEED DALAM PLASMA CUTTING Wijayanti, Ita; Mutiarani; Novebriantika; Kamsyah, Domi; Silalahi, Meschac Timothee; Nurhuda, Yusuf; Perkasa, Veryawan Nanda; Putro, Yogi Satrio
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 7 No. 1 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - June 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i1.9317

Abstract

Dalam fabrikasi logam, plasma cutting sangat penting karena menawarkan hasil potongan yang presisi, efisien dan fleksibel. Salah satu parameter kritis dalam plasma cutting yaitu cutting speed. Tujuan penelitian ini yaitu membandingkan kualitas hasil potong (cut quality) pada material mild steel dengan ketebalan 8 mm. Variasi cutting speed yang diteliti meliputi 3000 mm/min, 4000 mm/min, 5000 mm/min, dan 6000 mm/min. Pengamatan cut quality dilakukan secara visual dan pengukuran kedalaman hasil potongan menggunakan vernier caliper. Hasil pengamatan menunjukkan bahwa pada parameter cutting speed 3000 mm/min menghasilkan cut quality terbaik. Pada variasi cutting speed yang rendah menghasilkan cut quality yang baik karena plasma memiliki waktu yang cukup untuk penetrasi dan memotong material dengan bersih.  
ANALISA PERBANDINGAN KEMAMPUAN KARBON AKTIF SEKAM PADI DAN KARBON AKTIF BATOK KELAPA DALAM ALAT FILTRASI AIR Gunawan, Leo Van; Farhan, Ahmad; Rohmat, Abdul; Pujo Leksonowati, Nur Fitria; Purba, Adi Syahputra
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 7 No. 1 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - June 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i1.9327

Abstract

Dalam instalasi alat filtrasi air terdapat tiga jenis material yang umum dipakai sebagai media filtrasi yaitu Zeolit, Silika dan Karbon. Karbon aktif dapat dibuat menggunakan arang dari limbah hasil pertanian. Di Indonesia limbah sekam padi kebanyakan hanya di bakar atau diolah untuk tambahan pakan ternak. Batok kelapa kebanyakan digunakan untuk bahan untuk produksi briket. Penelitian ini dilakukan untuk membandingkan kemampuan karbon dari limbah sekam padi dan batok kelapa dalam meningkatkan kinerja alat filrasi air saat menyaring zat pencemar. Langkah-langkah dalam pembuatan karbon aktif dari limbah sekam padi dan batok kelapa ini yaitu melakukan proses pretreatment, proses dehidrasi, proses karbonisasi, proses pengaktifan secara fisika dan kimia. Kualitas air dilakukan pengujian menggunakan metode fisika dan kimia dengan mengacu standar kualitas air dari PP Republik Indonesia No 22 Tahun 2021 tentang Penyelenggaraan Perlindungan dan Pengelolaan Lingkungan Hidup. Hasil pengujian menunjukan air yang dihasilkan dari alat filtrasi menggunakan karbon aktif sekam padi berada pada baku mutu kelas 1 sedangkan air yang dihasilkan dari alat filtrasi menggunakan karbon aktif batok kelapa berada pada baku mutu kelas 2. Hal ini menunjukan penggunaan karbon aktif dari sekam padi dapat meningkatkan kinerja alat filrasi air dalam menyaring zat pencemar apabila dibandingkan dengan penggunaan karbon aktif dari batok kelapa.
PEMBUATAN DAN PENGUJIAN VARIASI PEMBEBANAN TERHADAP WAKTU YANG DIBUTUHKAN MESIN PEMISAH SARI PATI KEDELAI UNTUK PABRIK TAHU Farhan, Ahmad; Ghozali, Muhamad; Novrianda, Raju; Afnanto, Nurul; Nur Rohmat, Yusup; Sukroni, Sukroni; Gunawan, Leo Van; Pradana, Claudha Alba
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 7 No. 1 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - June 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i1.9372

Abstract

In Lohbener Village, Indramayu Regency, small and medium enterprises (SMEs) produce tofu using traditional methods, where the soybean pulp filtering process requires significant time and physical effort. To address this issue, a soybean pulp filtering machine was developed to improve filtering efficiency. The machine was tested with three different input loads—5 kg, 10 kg, and 15 kg—at a constant speed of 57 rpm. The filtering times recorded were 3 minutes 10 seconds, 5 minutes 17 seconds, and 8 minutes 21 seconds, respectively, determined by the point at which no more liquid discharged from the system. The final weights of the filtered soybean pulp were 1.5 kg, 5.7 kg, and 7.4 kg, respectively. These weight differences were influenced by an unbalanced soybean-to-water ratio, which affected extraction effectiveness. The average moisture content of the filtered pulp was 18% for the 5 kg load, 14.90% for 10 kg, and 15.17% for 15 kg. These results indicate that the use of the filtering machine significantly improves filtering efficiency compared to manual methods, in terms of time, output, and pulp quality. Overall, the machine has a positive impact on increasing productivity and product quality in tofu production at the SME level.
Analisis Variasi Polaritas Shield Metal Arc Welding Dan Build-Up Root Gap Terhadap Diskontinuitas, Metalografi, Dan Nilai Ketangguhan Pada Material Baja SS400 Untuk Struktur Bangunan Kapal Wibowo, Alvalo Toto; Al Amin, Mochammad Karim; Saputro, Dimas; Aprilian, Elham
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 7 No. 1 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - June 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i1.9404

Abstract

Dalam fabrikasi struktur bangunan kapal, root gap yang terlalu lebar sering ditemukan saat pengelasan, umumnya akibat kesalahan pemotongan pelat. Untuk memenuhi dimensi desain, perbaikan diperlukan. Metode build-up, penambahan lapisan logam las untuk memperkecil gap menjadi solusi. Dalam penelitian ini metode build-up menggunakan variasi layer sebanyak 2 sampai 4 layer serta perbedaan polaritas pada pengelasan SMAW menggunakan AC dan DC+ agar mendapatkan lelehan deposit las yang besar dan penetrasi dangkal sehingga ketebalan layer yang direncanakan terpenuhi. Akibat dari metode build-up material terkena heat input secara berulang yang dapat mempengaruhi struktur dan sifat mekanisnya sehingga penelitian ini bertujuan untukmengetahui diskontinuitas, metalografi, dan ketangguhan akibat proses tersebut. Hasilnya menunjukkan area build-up tidak terdapat diskontinuitas dan cacat. Struktur mikro menunjukkan perbedaan jumlah kandungan pearlite dan batas butir, dengan jumlah paling banyak hingga paling sedikit yaitu di daerah logam las, build-up, HAZ, dan logam dasar yang tidak banyak berubah. Uji makro menunjukkan HAZ melebar hingga 1 mm seiring penambahan lapisan, namun variasi polaritas tidak berpengaruh signifikan. Ketangguhan tertinggi terjadi pada polaritas AC sebesar 116,16 J dan paling rendah dengan polaritas DC sebesar 85,66 J akibat perbedaan heat input dan travel speed, sementara peningkatan jumlah layer build-up menurunkan ketangguhan.
ANALISA PENGARUH HAMBATAN KAPAL DENGAN PENAMBAHAN VARIASI PELETAKAN HYDROFOIL PADA LAMBUNG KAPAL PATROLI DENGAN MENGGUNAKAN METODE CFD Muh.Haikal Dwi Atabik; Fiveriati, Anggra; Anam, Chairul; Rohman, Abdul; Muzaka, Khairul
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 7 No. 1 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - June 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i1.9466

Abstract

Kapal patroli memiliki peran yang sangat penting dalam menjaga keamanan maritim, menegakkan hukum, dan mengawasi perairan nasional. Dalam mendukung tugasnya, lambung kapal patroli dituntut memiliki peforma tinggi, khususnya pada aspek kecepatan, efisiensi hambatan dan wetted surface area. Penelitian ini bertujuan untuk menganalisis pengaruh penambahan serta variasi peletakan hydrofoil terhadap hambatan total dan wetted surface area pada lambung kapal patroli. Tiga variasi peletakan hydrofoil diuji, yaitu peletakan bagian haluan, buritan dan kombinasi keduanya dengan titik acuan pada center of waterline. Computational Fluid Dynamics digunakan untuk mengalisa hambatan total dengan variasi kecepatan 20, 24 dan 28 knot. Hasil penelitian menunjukkan bahwa penambahan peletakan variasi hydrofoil belum mampu menurunkan nilai hambatan total secara signifikan dibandingkan model lambung kapal patroli tanpa penambahan hydrofoil. Akan tetapi pada ketiga variasi peletakan hydrofoil pada lambung kapal patroli, variasi peletakan hydrofoil pada haluan kapal menunjukkan bahwa peforma terbaik dengan penurunan nilai wetted surface area sebesar 17.41% pada kecepatan 24 dan 23.41% pada kecepatan 28 knot
Analisa Ukuran Antropometri Pelindung Wajah COVID - 19 Hasil Manufaktur Mesin 3D Printing Zulfadli; Mahmud; Dirhamsyah, Muhammad; Samsul Bahri; Azwar; Sariyusda
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.9201

Abstract

The COVID-19 pandemic has not only resulted in significant loss of life but has also caused a critical shortage of Personal Protective Equipment (PPE) for healthcare workers. In response, the global community has leveraged 3D Printing technology to produce face shields. This study aims to analyze and evaluate the conformity of the dimensions of 3D-printed face shields with the head anthropometric measurements of the Indonesian population. Anthropometric data from three head segments (Head Length/D1, Head Breadth/D2, and Face Height/D3) were collected from 377 subjects. Three face shield models (PW1: low grade, PW2: medium grade, PW3: high grade) were manufactured using a 3D Printing machine. The analysis results indicate that the existing designs are not fully compatible with the percentile dimensions of the Indonesian population. Modifications to the frame and visor dimensions are required to better align with Indonesian anthropometric data. Additionally, adjustments in 3D Printing process parameters and improved product quality are essential to achieve a more ergonomic design.
PRODUCTIVITY IMPROVEMENT LAPPING POT PADA MESIN AUTO CONTOUR LAPPING Novebriantika; Agung Handi Wibowo; Nurul Fadilah; Rahman Hakim; Yusuf Nurhuda; Ita Wijayanti
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.9487

Abstract

Improving seal production output requires productivity enhancements that increase the efficiency and effectiveness of both machinery and tooling. One of the main issues was identified in the auto contour lapping machine, particularly in the lapping pot, which was considered ineffective and inefficient in its application. This condition resulted in low production output, longer processing times, and increased material waste due to the use of rubber-based lapping pots. To overcome these limitations, an improved lapping pot was designed and manufactured using 3D printing technology, replacing rubber with filament material to reduce production waste. This study focuses on the design, fabrication, and feasibility evaluation of the improved lapping pot through direct implementation in the production process. Performance evaluation included visual inspection, free height measurement, and surface quality inspection of the seals. The results show that the improved lapping pot is suitable for production use and significantly enhances productivity. By accommodating four seals in a single lapping pot, the processing time was reduced by a total of 75 seconds per cycle. Consequently, production output increased fourfold from 144 seals per hour to 576 seals per hour, while the seal quality remained consistent and met customer-required dimensions and specifications.
REDUCTION OF LIFTED STITCH DEFECTS IN WIRE BONDING PROCESS THROUGH ROOT CAUSE ANALYSIS Puspita, Widya Rika; Manurung, Anjunius; budiana, Budiana; Nur Sakinah Asaad; Jefiza, Adlian; Nakul, Fitriyanti; Putra, Irwanto Zarma; Diputra, Muhammad Naufal Airlangga; Illa Aryeni; Handri Toar; Anggraini, Ria
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.9604

Abstract

Reliable connection inspection is crucial for the quality of semiconductor products. A frequent issue is stitch defects during wire bonding. To address this, an investigation was conducted using flow charts. Additionally, an analysis was performed by identifying root causes using the Fishbone Diagram method and the 5 Whys technique. After improvements, including targeted operator training, a significant reduction of 96.75% in stitch defects was achieved. This study demonstrates that the combination of root cause analysis methods and operator training effectively enhances the reliability of the wire bonding process and the quality of semiconductor products. This study did not account for environmental factors that might influence the wire bonding process, such as temperature and humidity variations. Therefore, the findings may be limited in settings with different environmental conditions.
ANALISA MOMEN PUNTIR POROS IMPELLER PADA SISTEM PROPULSI WATERJET KAPAL 6 METER DENGAN VARIASI BLADE IMPELLER MENGGUNAKAN METODE CFD Bagas Dwi Kurniawan; Jangka Rulianto; Achdri Fauzi Nugraha Oloan; I Gusti Ngurah Bagus Catrawedarma; Chairul Anam
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.9968

Abstract

Analysis of the impeller shaft torsion moment in the waterjet system with impeller blade variations aims to analyze the strength of the impeller shaft caused by the specified engine power. The engine used has a power of 6.5 hp and has an output power of 2000 Rpm. This study aims to determine the impeller shaft torsion moment with impeller blade variations using the Computational Fluid Dynamic (CFD) method. Using Aloy steel 4340 material which has a shaft diameter of 23 mm and a length of 700 mm. The torque value that appears in variation 1 with 3 impeller blades is 30.65 Nm, variation 2 with 4 impeller blades is 87.61 Nm and for variation 3 with 5 impeller blades is 33.07 Nm. In accordance with the results of the calculation of the torsion moment of 30.85 Nm, it is known that variation 1 with 3 impeller blades is said to meet the specified criteria to be applied to the waterjet system. Based on the results of the specified allowable stress of 60.89 Nm, it was found that for variations 1 and 3 with the number of impeller blades of 3 and 5 respectively, they have met the safe conditions for the impeller shaft torsion moment, by considering that variation 3 is adjusted to the results of the impeller shaft torsion moment calculation to determine the effectiveness for the specified waterjet system.
TECHNICAL ANALYSIS OF ADDING HOLES TO THE SKEG OF A TUGBOAT AND ITS EFFECTS ON FLOW AND RESISTANCE USING THE COMPUTATIONAL FLUID DYNAMICS METHOD David Prayogo; Abdul Rohman; Jangka Rulianto; Khairul Muzaka; I Gusti Ngurah Bagus Catrawedarma
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.10163

Abstract

Tugboats play a crucial role in supporting the safety and operational efficiency of ports and offshore activities. One of the key components in tugboat design is the skeg, which serves to enhance directional stability and reduce yawing effects. This study aims to analyze the influence of the number of holes in the skeg on the flow characteristics and resistance of a tugboat. Three skeg variations were tested: a skeg without holes, a skeg with two holes, and a skeg with four holes, under two speed conditions, namely 10 knots and 15 knots. The observed parameters include wetted surface area, drag force, and longitudinal flow velocity (velocity u). The simulation results indicate that the skeg without holes produced the lowest drag values, at 22.570 N at 10 knots and 138.430 N at 15 knots, along with a more stable and streamlined flow pattern. In contrast, adding holes to the skeg resulted in increased drag and flow disturbances in the form of vortices and fluid separation. Therefore, the skeg without holes is considered more hydro dynamically optimal for improving the operational efficiency of tugboats.  

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