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All Journal Jurnal Energi Dan Manufaktur KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Mechanical Jurnal Elementer (Elektro dan Mesin Terapan) Jurnal Teknik Mesin Jurnal Teknik Mesin Indonesia APTEK Journal of Integrated and Advanced Engineering (JIAE) JITER-PM (Jurnal Inovasi Terapan - Pengabdian Masyarakat) Jurnal Polimesin Nemui Nyimah
Nugraha, Nurcahya
Jurusan Teknik Mesin Fakultas Teknik Universitas Lampung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Investigation of geometric effects on fluid viscosity using the falling ball method Akhyan, Amnur; Ma’a, Mustaza; Irdam, Fortinov Akbar; Alvarez, Alvin; Nugraha, Nurcahya; Nurkhamdi, Nurkhamdi
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7347

Abstract

The falling ball method, based on Stokes law, is a simple yet accurate technique for determining fluid viscosity, though its precision is influenced by factors such as wall, Reynolds, end, memory, and off-center effects. This study aims to determine the effect of spherical geometry on the fluid viscosity value represented by the sphericity factor . An experimental study was conducted to examine its accuracy of viscosity values to produce the correction factor. The sphericity factors studied were 0.993, 0.976, and 0.949. To reduce the uncertainty caused by the wall effect, the ratio db/Dt was 0.071, using a 5.8mm diameter plastic ball and SAE 40 oil fluid at 32.4°C. Terminal velocity (??) was obtained by analyzing the video of the ball falling in the fluid, which was displayed on the tracker software. The video was taken using a 1080p, 60 fps camera. Wall and Reynolds effect correction factors were used to amend experimental viscosity values. The result indicates the viscosity will be accurately determined by selecting a larger sphericity value of the ball during the experimental process. It will reduce the necessity of correction factors to obtain the value of fluid viscosity.
Pengaruh Penggunaan Aplikasi Power BI dalam Analisis Produksi di Pabrik Karton Box XYZ di Provinsi Lampung, untuk Meningkatkan Efisiensi dan Pengambilan Keputusan Angga Darma Prabowo; Dondi Kurniawan; Sabiqunassabiqun; Rizal Nazarrudin; Nurcahya Nugraha; Eko Wahyu Saputra; Mochammad Resha; Saputra, Rizal Adi
Nemui Nyimah Vol. 5 No. 1 (2025): Nemui Nyimah Vol. 5 No. 1 2025
Publisher : FT Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/nm.v5i1.164

Abstract

This study aims to analyze the impact of using Power BI in improving efficiency and decision-making at Karton Box XYZ Factory in Lampung Province. Using action research methodology, production data, machine efficiency, product quality, raw material usage, and response time data were collected and analyzed before and after the implementation of Power BI. The results show that the implementation of Power BI successfully increased daily production, machine efficiency, product quality, as well as reduced raw material waste and response time. With its ability to visualize data in real-time, Power BI assisted the factory in optimizing production processes and enhancing operational efficiency. This study concludes that the use of Power BI has a positive impact on the factory's operational performance, boosting competitiveness, and supporting faster and more accurate data-driven decision-making.
Experimental and Analytical Investigation of Mooring Angle and Tube Mass Effects on the Dynamic Response of a Submerged Floating Tunnel Segment Model under Wave Excitation Akmal, Jamiatul; Dinata, Ragil Alvin; Tanti, Novri; Hasymi, Zulhendri; Nugraha, Nurcahya
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 23, No 1 (2026): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v23i1.77442

Abstract

The Submerged Floating Tunnel (SFT) is an alternative infrastructure for crossing transportation routes in deep and wide waters, but further studies are still needed on the dynamic response to wave forces. This study aims to evaluate the dynamic response of a wave-excited Tension Leg type SFT segment model, specifically regarding the influence of the mooring cable angle and the influence of the tube mass. This study was conducted using a damped forced vibration theory approach, exploring the relationship among three main elements of structural dynamics: mass (?), damping (?), and stiffness (?). These parameters are important as fundamental elements that determine the overall stiffness of the structure. The SFT segment model, made of a 3-inch (76 mm) diameter tube with a length of 700 mm, was installed at a depth of 1/6 z below the water surface. The parameters tested included the effect of the mooring cable angle (variations: 15°, 30°, and 45°) and the effect of the tube mass (variations: 0.5 kg, 0.75 kg, and 1 kg). The displacement response of the specimens was obtained from video recordings and analyzed using video tracking software. The experimental results show that an increase in the angle of inclination of the mooring cable leads to an increase in stiffness (?) and a smaller structural displacement. In addition, a larger tube mass results in a greater displacement. The experimental data showed good agreement with the theoretical model of single-degree-of-freedom (SDOF) damped forced vibration, with deviations below 10%. Therefore, this study recommends the use of the largest feasible mooring angle and smallest practical tube mass for optimal SFT design, while still considering real-world application limitations.
Co-Authors Adli, Muhammad Amirul Ahmad Su'udi Ahmad Su’udi Ahmad Yonanda Akhyan, Amnur Alvarez, Alvin Angga Darma Prabowo Asnawi Lubis Checilia, Azzahra Dwi Dinata, Ragil Alvin Eko Wahyu Saputra Hadi Prayitno Ibrahim, Fauzi Irdam, Fortinov Akbar Jamiatul Akmal Kurniawan, Dondi Ma'a, Mustaza Ma’a, Mustaza Mochammad Resha Nazarrudin, Rizal Novison, Roni Novri Tanti Novri Tanti, Novri Nurkhamdi, Nurkhamdi Panji Firmanul Hakim Pramana, Tunggul Rizal Adi Saputra Sabiqunassabiqun Saputra, Eko Wahyu Wijianto, Agus Zaky Abyan Fahrain Zulhendri Hasymi