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INDONESIA
Indonesian Journal of Engineering and Science (IJES)
Published by Asosiasi Peneliti Sriwijaya (APS)
ISSN : -     EISSN : 2774373X     DOI : 10.51630
Core Subject : Science, Engineering,
Energy Engineering Materials Science & Nanotechnology Mechanical Engineering
Indonesian Journal of Engineering and Science (IJES : ISSN 2274-373X) is a peer-reviewed journal that aims at the publication and dissemination of original research articles on the latest developments in all fields of engineering science and technology. The journal publishes original papers in English, which contribute to the understanding of engineering science and improvement of the engineering technology and education. Papers may be theoretical, experimental and paper review. The contribution should be unpublished before and not under consideration for publication elsewhere.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 3 Documents
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Search results for , issue "vol. 7 no. 2 (2026): table of contents: in progress" : 3 Documents clear
EVALUATION OF THE MILLING PROCESS USING AL₂O₃ AND Fe₃O₄ NANOFLUIDS IN AN MQL SYSTEM ON MACHINING POWER AND SURFACE ROUGHNESS Muhammad Yanis; Yonichart Artha Wiradjaya; Muhammad Zahir
Indonesian Journal of Engineering and Science Vol. 7 No. 2 (2026): Table of Contents: In progress
Publisher : Asosiasi Peneliti Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51630/ijes.v7i2.221

Abstract

This study investigated the effect of nanofluid-based Minimum Quantity Lubrication (MQL) cooling strategy and machining parameters on machining power and surface roughness in milling process. Two nanofluids, Al₂O₃ and Fe₃O₄, were evaluated under identical cutting conditions. The results showed that the machining power using Al₂O₃ nanofluid was slightly lower than Fe₃O₄ (1%). However, it produced higher surface roughness (14.27%) than Fe₃O₄. Furthermore, machining parameters significantly affected the performance. Increasing cutting speed (vc = 3.23%), feed rate (fz = 0.93%), and depth of cut (ax = 0.33%) led to higher machining power due to increased material removal rate and cutting force. Surface roughness was mainly influenced by fz = 8.49% and ax = 6.16%, with feed rate identified as the dominant factor. Taguchi analysis and ANOVA revealed that depth of cut contributed most to machining power, while feed rate dominated surface roughness. The optimal machining power was achieved at vc = 22.5 m/min, fz = 0.028 mm/tooth, and ax = 0.5 mm, with values of 1.336 kW (Al₂O₃) and 1.341 kW (Fe₃O₄). Meanwhile, the best surface roughness was obtained at vc = 40.8 m/min, fz = 0.028 mm/tooth, and ax = 0.5 mm, with values of 0.596 µm (Al₂O₃) and 0.494 µm (Fe₃O₄).
DESIGN OF A PID CONTROLLER FOR SPEED OF A CONVEYOR Truong-Nguyen Phan; Huu-Tai Nguyen; Quy-Kien Tran; Trung-Nhan Nguyen; Minh-Thanh Nguyen; Hoang-Danh Vu; Thanh-Toan Nguyen; Nguyen-Quoc-Nam Dang; Duc-Quang-Thai Nguyen; Ba-Anh Le; Van Dong Hai Nguyen; Thi-Ngoc-Thao Nguyen; Hoang-Lam Le
Indonesian Journal of Engineering and Science Vol. 7 No. 2 (2026): Table of Contents: In progress
Publisher : Asosiasi Peneliti Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51630/ijes.v7i2.222

Abstract

This study presents a compact and energy-aware conveyor speed control system designed to maintain stable and precise motor operation. A PID controller is implemented on an Arduino Mega, using encoder feedback and a discrete Kalman filter to reduce measurement noise and improve response smoothness. The system incorporates an H-bridge driver for motor actuation and an LCD module for on-site monitoring, together with a Python-based interface that provides real-time visualization of set speed, actual speed, and transient response via UART communication. Experimental results show that the controller achieves fast response, minimal steady-state error, and low overshoot across various reference speeds. Performance at a fixed 25-rpm setpoint under both no-load and light-load conditions further demonstrates good disturbance tolerance. Overall, the system offers a reproducible, low-cost, and energy-efficient solution suitable for small conveyor applications in educational and prototyping environments.
PICO-SCALE OPEN FLUME PROPELLER WATER TURBINE PERFORMANCE UNDER VARIATION IN AIRFOIL THICKNESS-TO-CHORD RATIO Christian Romulus Tigor; Warjito Warjito; Budiarso Budiarso; Aji Putro Prakoso
Indonesian Journal of Engineering and Science Vol. 7 No. 2 (2026): Table of Contents: In progress
Publisher : Asosiasi Peneliti Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51630/ijes.v7i2.223

Abstract

Air pollution from coal-fired power plants contributes approximately 44% of Indonesia’s CO₂ emissions. Transitioning to renewable sources, such as hydroelectric power, offers a viable solution, particularly with open-flume propeller turbines in remote areas. This study investigates the effect of T/C ratios on pico-scale open-flume propeller turbines using NACA 44XX airfoils. Three configurations (0.11, 0.12, and 0.13) with varying rotational speeds were evaluated using computational fluid dynamics (CFD) simulations with mesh motion in ANSYS Fluent, along with analytical methods for torque, power output, and efficiency. T/C 0.13 consistently delivered the best performance, reaching a maximum efficiency of 15.39% at 850 rpm. In contrast, the analytical method found that the maximum efficiency of that configuration is approximately 26% at 1100 RPM. The deviation between the analytical and numerical results arises from the analytical method's limitations in capturing the viscous shear flow around the turbine blades and the gap-clearance loss. The pressure distribution analysis revealed that T/C 0.13 maintained the most balanced high–low pressure zones, minimizing early flow separation. T/C 0.12 exhibited instability at high RPM due to less stable pressure differentials, whereas T/C 0.11 maintained stability with sharper pressure gradients and a higher risk of separation despite lower output. These findings emphasize the role of optimal blade geometry in improving efficiency, pressure–velocity stability, and flow control in small-scale water turbines. However, the lack of experimental testing in this study limits the validity of its results; further experimentation is needed.

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