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All Journal Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Prosiding Semnastek Majalah Ilmiah MOMENTUM INOVTEK POLBENG Infotekmesin Jurnal Teknik Elektro Uniba (JTE Uniba) DEVICE Jurnal Pengabdian Kepada Masyarakat Abdi Putra Jurnal Maritim Polimarin JURNAL SAINS DAN TEKNOLOGI MARITIM INCOME: Indonesian Journal of Community Service and Engagement Indonesian Research Journal on Education Dedikasi: Jurnal Pengabdian Pendidikan dan Teknologi Masyarakat Kolaborasi: Jurnal Hasil Kegiatan Kolaborasi Pengabdian Masyarakat Multidisciplinary Indonesian Center Journal
Noviarianto, Noviarianto
Politeknik Maritim Negeri Indonesia
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Pengaruh Quenching Terhadap Sifat Mekanik dan Struktur Mikro Baut Connecting Rod Bekas Untuk Alat Gesek FSW Ari Putranto, Wahyu; Khaeroman; Susanto; Herdawan, Deri; Noviarianto
Infotekmesin Vol 16 No 1 (2025): Infotekmesin: Januari 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i1.2531

Abstract

One method of joining soft metals such as aluminum that is widely used is Friction Stir Welding (FSW). The friction tool is a very important part of FSW. Friction tools are usually made from hardened H13 steel. This research aims to make a friction tool from steel connecting rod bolts used in marine diesel engines. The experimental methods used include FSW tool design, heat treatment of the material at a temperature of 900oC followed by a quenching process with water and salt water cooling media, then continued with material testing (chemical composition test, hardness test, and micrographic test). The test results obtained from the chemical composition test show that the connecting rod bolts include AISI 4145 steel material. The highest hardness value obtained from the connecting rod steel in the saltwater quenching process was 52.67 HRC with a martensite phase, as seen from the micrographic test. Used steel connecting rod bolts from marine diesel engines can be used as FSW friction tool material.
A SIMPLE STRATEGY OF LINEAR REGRESSION ON 8-BIT MICROCONTROLLER ADC TO IMPROVE SENSOR VALUE READING ACCURACY Tur, Turahyo; novi, Noviarianto
Multidisciplinary Indonesian Center Journal (MICJO) Vol. 2 No. 4 (2025): Vol. 2 No. 4 Edisi Oktober 2025
Publisher : PT. Jurnal Center Indonesia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62567/micjo.v2i4.1468

Abstract

This study proposes a linear regression-based intelligent calibration approach to improve the accuracy of water turbidity sensor readings in an Arduino microcontroller-based embedded system. The primary objective of this research is to develop a mathematical model capable of converting analog values ​​from the Analog-to-Digital Converter (ADC) into a numerical representation that reflects the actual water turbidity level in Nephelometric Turbidity Units (NTU). The calibration process was performed using a standard Hanna Turbidity Meter with water samples ranging from 0.56 NTU to 500 NTU. Measurement results demonstrated a strong linear relationship between the ADC value (495–686) and NTU, with an average system accuracy level above 90%. Comparison of sensor measurements with the standard instrument showed an error margin below 5%, confirming the reliability of the linear regression model in compensating for optical sensor nonlinearities.
Optimization of CNC Machining Parameters (Cutting Speed and Feed Speed) on 7075 Aluminum Material to Achieve Minimum Surface Roughness Harsono, Prijo; Suyono, Suyono; Noviarianto, Noviarianto; Putranto, Wahyu Ari
Indonesian Research Journal on Education Vol. 5 No. 6 (2025): Irje 2025
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/irje.v5i6.3671

Abstract

This study examines the optimization of CNC milling machining parameters on 7075 aluminum material to achieve minimum surface roughness through a qualitative research approach. 7075 aluminum is a high-grade aluminum alloy with superior mechanical properties that is widely used in the aviation and automotive industries. The study was conducted by analyzing the effect of cutting speed (Vc) and feed rate (f) on the surface quality of the machined results. The research method uses a qualitative descriptive approach through in-depth observation data collection techniques, structured interviews with operators and technicians, and documentation of the machining process. Research data were obtained from surface roughness measurements using a surface roughness tester (Ra) and visual analysis using machine vision techniques. The results of the analysis show that the combination of an optimal cutting speed of 300-400 m/min and a feed rate of 0.1-0.15 mm/rev produces the lowest surface roughness on 7075 aluminum material. The use of appropriate coolant and maintenance of carbide cutting tools are very significant in achieving optimal surface results. The findings of this study are expected to provide practical guidance for the manufacturing industry in optimizing the CNC machining process for 7075 aluminum material to improve product quality and productive efficiency while still considering industrial sustainability.
DESIGN AND PERFORMANCE EVALUATION OF A HIGH-VOLTAGE DC GENERATOR USING A COCKCROFT-WALTON MULTIPLIER Turahyo Turahyo; Noviarianto Noviarianto
Multidisciplinary Indonesian Center Journal (MICJO) Vol. 3 No. 3 (2026): Vol. 03 No. 3 Edisi Juli 2026
Publisher : PT. Jurnal Center Indonesia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62567/micjo.v3i3.2462

Abstract

This paper presents the design and performance evaluation of a high-voltage direct current (DC) generator based on the Cockcroft–Walton (CW) voltage multiplier for laboratory-scale applications in electrical engineering. Conventional high-voltage generation methods often involve bulky transformers and complex circuitry, making them less suitable for compact and cost-effective laboratory use. To address these limitations, a modular CW-based system is proposed, integrating a high-frequency input source with an optimized diode-capacitor ladder network. The proposed system is designed to achieve high DC voltage output in the kilovolt range while maintaining acceptable levels of ripple and efficiency. Experimental results show that the system can achieve up to 86% of the theoretical output voltage under no-load conditions, with an efficiency of around 70.8%. Furthermore, the ripple voltage of the generated output voltage is very small, demonstrating stable performance suitable for laboratory applications. The proposed design offers a compact, cost-effective, and reliable solution for high-voltage DC generation, making it highly suitable for educational and low-power applications.
Optimalisasi Peralatan Inert Gas System untuk Pencegahan Terjadinya Ledakan Pada Tangki Minyak di Kapal Tanker Khaeroman Khaeroman; Noviarianto Noviarianto; Ridwan Ridwan
Jurnal Maritim Polimarin Vol. 11 No. 2 (2025)
Publisher : PPPM Polimarin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52492/jmp.v11i2.131

Abstract

Oil tankers are a type of vessel specifically designed to transport oil or its derivatives. One of the preventive safety measures employed on these ships is the inert gas system—a system that generates gas with low oxygen content to prevent explosions onboard. However, an increase in oxygen concentration in the inert gas is a common issue encountered, which makes optimizing the performance of the inert gas system a matter of serious concern. The methodology adopted in this research is descriptive qualitative, with the inert gas system aboard MT. NORDDOLPHIN serving as the primary research object. Data collection was carried out through several approaches, including direct field observation, interviews with relevant personnel, and a literature review of technical documents such as instruction manuals and standard operating procedures (SOP) available on the vessel. The study demonstrates that the rise in oxygen content in inert gas is caused by inadequate maintenance of the fuel oil control valve and a dirty main burner, which leads to an imbalance in the combustion ratio. The effort undertaken to keep the oxygen level below the threshold of 4% involves lowering the correction factor on the boiler. This adjustment increases the fuel supply during combustion, which in turn raises the carbon dioxide concentration and lowers the oxygen level in the inert gas
Analisis Penyebab Penurunan Temperatur Pada Sistem Permesinan di Kapal Wahyu Ari Putranto; Shendi May Rudin; Yulius Oscar; Khaeroman Khaeroman; Noviarianto Noviarianto; Ngatmin Ngatmin
Jurnal Maritim Polimarin Vol. 12 No. 1 (2026)
Publisher : PPPM Polimarin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52492/jmp.v12i1.176

Abstract

Marine generators play a crucial role in supplying electrical power for overall ship operations. This study aims to investigate the factors causing the temperature drop in the Marine Fuel Oil (MFO) system of the generator on MV. Radiant Reb. The temperature decrease (to 98ºC-100ºC) leads to increased fuel viscosity, flow resistance, and a decline in both combustion efficiency and diesel generator performance. By applying a descriptive-qualitative case study approach involving direct observation, interviews, and documentation, this research identified four primary causes. These factors include: reduced heater performance due to scaling and leaks, a suboptimal steam trap causing condensate buildup, damaged thermal insulation (lagging) accelerating heat loss, and wear on the circulation pump disrupting fuel flow. Corrective measures were implemented through routine maintenance and thorough inspections of these vital components. In conclusion, preventive maintenance and early detection are crucial for maintaining the fuel temperature within the ideal range (108ºC-118ºC) to preserve the operational efficiency and reliability of the marine generator.
Optimalisasi Kinerja Pompa Minyak Lumas Untuk Mencegah Penurunan Tekanan Pada Generator Engine Type Daihatsu di MV. Great Venture Bagus Viky Satriatama; ngatmin ngatmin; Wahyu Ari Putranto; Arif Rakhman Suharso; Noviarianto Noviarianto
Jurnal Maritim Polimarin Vol. 12 No. 1 (2026)
Publisher : PPPM Polimarin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52492/jmp.v12i1.182

Abstract

The lubrication system serves not only to lubricate moving and stationary parts but also plays a role in cooling the engine. This study aims to identify the factors causing a rise in lubricating oil temperature and a drop in pressure within the diesel generator's auxiliary engine. The research was conducted aboard the MV. Great Venture, owned by Wah Kong. A qualitative descriptive method was employed, utilizing interviews with the Third Engineer. The findings indicate that the rise in temperature and drop in lubricating oil pressure were caused by the clogging of the oil pump filter due to sealant debris originating from the L.O. cooler. The solution to this issue is to perform routine maintenance on the generator engine in accordance with the Planned Maintenance System (PMS).
Pemberdayaan Pemuda melalui Pelatihan Dasar Teknik Las Listrik (SMAW) Berbasis Keselamatan Kerja dan Kewirausahaan di Kelurahan Bringin, Semarang Suyono Suyono; Noviarianto Noviarianto; Khaeroman Khaeroman; Wahyu Ari Putranto; Christine Widilestari
Dedikasi: Jurnal Pengabdian Pendidikan dan Teknologi Masyarakat Vol. 4 No. 2 (2026): Dedikasi 2026
Publisher : Institut Teknologi Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/dedikasi.v4i2.183

Abstract

Pengangguran terbuka yang didominasi oleh lulusan sekolah menengah merupakan permasalahan struktural yang memerlukan intervensi melalui pelatihan vokasi berbasis komunitas. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan kompetensi teknis, kesadaran Keselamatan dan Kesehatan Kerja (K3), dan mindset kewirausahaan pemuda melalui pelatihan dasar Shielded Metal Arc Welding (SMAW). Mitra kegiatan adalah remaja Karang Taruna RT 02 RW 07, Kelurahan Bringin, Kecamatan Ngaliyan, Kota Semarang. Metode pelaksanaan menggunakan pendekatan andragogi partisipatif dengan tahapan: (1) sosialisasi dan edukasi K3, (2) demonstrasi teknik pengelasan posisi 1G dan 2G, dan (3) praktik langsung (learning by doing) dengan evaluasi weld bead. Hasil kegiatan menunjukkan peningkatan signifikan pada pemahaman K3 dan keterampilan dasar las. Evaluasi pre-test dan post-test menunjukkan kenaikan rata-rata pemahaman teori dan K3 dari 42,5 menjadi 84,0. Secara praktis, 85% peserta berhasil menghasilkan manik las yang memenuhi standar visual dasar tanpa cacat porosity yang berarti. Lebih jauh, kegiatan ini berhasil menstimulasi minat pemuda untuk mendirikan Usaha Mikro, Kecil, dan Menengah (UMKM) bengkel las. Program ini membuktikan bahwa transfer keterampilan vokasi di tingkat akar rumput efektif sebagai katalisator kemandirian ekonomi pemuda.
Co-Authors Akhmad Nuriyanis Anwar, Amthori Arif Rakhman Suharso Bagus Viky Satriatama Christine Widilestari Deri Herdawan Dwi Retnandari, Septina Eka Firmansyah Fransisco Danang Wijaya Heri Kiswanto Hero Budi Santoso Hero Budi Santoso Hidayat, Ihsan Ilham Putranto, Angga Iqbal Alansyah, Fardian Janes Ginting, Harjun Joko Triyono Khaeroman Khaeroman Khaeroman Khaeroman, Khaeroman Kiswanto, Heri Kiswanto ngatmin ngatmin Ngatmin Ngatmin Nugroho, Anang Budhi Nur Kholis P Tony Kusumartono P. Tony Kusumartono P. Tony. Kusumartono Prijantono Dillyanto Prijo Harsono Purwanto Rahindra Bayu Kumara Ridwan Ridwan Rifki Arya Wiguna Santoso, Hero Budi Sekti, Irsat Surya Shendi May Rudin Sri Tutie Rahayu Supardi Supardi SUSANTO Susanto Susanto Susanto Susanto Suyono Suyono Suyono Suyono Suyono Suyono Tony Kusumartono Tur, Turahyo turahyo, Turahyo Ulum, Rizka Noor Miftakhul Wahyu Ari Putranto Wahyu Ari Putranto Widar Bayu Wantoro Yulius Oscar