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Scientific Journal of Mechanical Engineering Kinematika
Published by Universitas Lambung Mangkurat
ISSN : 26559048     EISSN : 2655903X     DOI : http://dx.doi.org/10.20527
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Scientific Journal of Mechanical Engineering Kinematika (SJME Kinematika) is a mechanical engineering journal that focuses on Energy, Applied Mechanics, Materials, Manufacturing Processes. SJME Kinematics journal publish in Indonesian and receive in English. Scientific Journal of Mechanical Engineering Kinematika (SJME Kinematika) is an Open Access Journal that is available for free on online media. We are not only accept journals that focus on the derivatives of the four fields below, but also the possibility of an integrated focus of fields from several fields.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 166 Documents
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ANALISIS BERBASIS SIMULASI TERHADAP SIFAT AERODINAMIKA AIRFOIL NACA 2412 DENGAN PENAMBAHAN ELEMEN FLAP DAN SLAT Okto Dinaryanto; Bahrul Jalaali; Syahrizal; Abdul Haris Subarjo; Dedet Hermawan Setiabudi; Eli Kumolosari
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.724

Abstract

The original concept for the Easy-Fly project was to create an ultra-light STOL (Short Takeoff and Landing) plane featuring minimal drag and speed attributes. To support this goal, CFD (Computational Fluid Dynamics) was applied by varying the configuration of single-grooved flaps and slats and the angle of attack on the NACA 2412 airfoil. The viscous model used in this case is Spalart-Allmaras. The variation of the angle of attack (α) was modified in the range of 0°-20°. For the flap model, the deflection angle was adjusted to 30° and 40°, and slats were added to the configuration. Based on the results of the study, it was found that flap deflections of 30° and 40° resulted in higher CL values ​​at an angle of attack of 0°. The use of flap and slat designs on the NACA 2412 airfoil effectively delayed airflow separation until it reached a maximum angle of attack of 24°. In addition to the high-lift system design on the NACA 2412 airfoil, changes in camber and effective chord line adjustments resulted in significant improvements in the lift coefficient (CL), drag coefficient (CD), and stall angle. Finally, a 30° flap deflection was more efficient than a 40° deflection in takeoff conditions. The average percentage increase in CL/CD from a 30° to a 40° flap was 17.61%.
INVESTIGASI EKSTRAK KULIT BATANG KAPUK SEBAGAI INHIBITOR KOROSI PADA BESI ASTM A36 DALAM LARUTAN NaCl 5% Syarif Hidayatullah; Suteja
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.791

Abstract

The growing concern for sustainability and environmental issues in the field of metal corrosion has become increasingly urgent in response to global demands for the adoption of environmentally friendly technologies. One of the widely used approaches to address this challenge is the utilization of plant-based corrosion inhibitors due to their abundant availability and relatively simple extraction process. This study aims to investigate the effect of varying concentrations of kapok bark extract inhibitors specifically at 1000, 2000, and 3000 mg/L on the corrosion rate of ASTM A36 steel in a 5% NaCl solution. The anticorrosion performance and inhibition mechanism were carefully examined through potentiodynamic polarization (PDP) testing and electrochemical impedance spectroscopy (EIS). The results revealed that at a concentration of 3000 mg/L, the kapok bark extract was able to significantly reduce both cathodic and anodic reaction rates. This condition led to a decrease in the corrosion rate from 1.51 to 0.28 mm/year in the NaCl solution. The highest inhibition efficiency, 81.61%, was achieved at an inhibitor concentration of 3000 mg/L. Based on these findings, the kapok bark extract demonstrates significant potential as an environmentally friendly corrosion inhibitor for ASTM A36 steel.
KARAKTERISTIK FISIK, MEKANIK, DAN THERMAL BIOKOMPOSIT PVA DIPERKUAT NANOSELULOSA SERAT WARU - SERBUK CaCO3 Suteja; Syarif Hidayatullah
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.810

Abstract

Polyvinyl alcohol (PVA) biocomposites are a potential material to replace conventional plastics, but mechanical strength and thermal resistance are still low. To overcome these limitations, reinforcement from waru fiber nanocellulose (NCW) and calcium carbonate (CaCO₃) fillers are added to PVA bioplastics. Biocomposites formulator were mixed using a magnetic stirrer until gel formed, then poured onto glass and dried in oven for 12 hours at 60 °C. The density results showed an increase to 2.15 g/cm3 and a thickness of 1.32 mm after adding CaCO3. Meanwhile, PVA-NCW had a density and thickness of 1.27 g/cm3 and 0.26 mm respectively. This indicates as a major factor in increasing the tensile strength of biocomposites. The fillers play a role in increasing the tensile strength of biocomposites through better surface bonding. In addition, the interfacial bonding between PVA and the fillers has been confirmed by FTIR results. SEM observation shows the presence of clumps of NCW and CaCO3. In line with the tensile testing, the highest thermal resistance was also found in the PVA-CaCO3 sample. This is in line with the amount of residue produced by the PVA-CaCO3 sample 6.38%. The developed biocomposite offers great potential as a conventional plastics substitute.
PENGARUH SUHU NOZZLE 3D PRINTING TERHADAP KEKUATAN TARIK DAN KEKERASAN PERMUKAAN FILAMEN PP DAUR ULANG Adnan Fatchurrachman; Danar Susilo Wijayanto; Taufik Wisnu Saputra
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

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

Abstract

This study aims to investigate the effect of nozzle temperature variations on the tensile strength and surface hardness of 3D-printed specimens using polypropylene (PP) filament derived from instant noodle packaging waste. The filament was produced through an extrusion process at 200°C and subsequently printed into test specimens using Fused Deposition Modeling (FDM) with nozzle temperatures of 190°C, 200°C, and 210°C. Tensile testing was conducted in accordance with ASTM D638 Type IV, while hardness testing was performed using the Shore D method. The results show that nozzle temperature significantly affects the mechanical and physical properties of the specimens. The optimum performance was obtained at 200°C, yielding a tensile strength of 16.83 MPa and a hardness of 47.80 Shore D. At 190°C, both tensile strength and hardness decreased, while at 210°C hardness increased but tensile strength declined due to potential thermal degradation. Therefore, 200°C is identified as the optimum temperature, providing the best balance between mechanical performance and structural stability
ENHANCEMENT OF BIOETHANOL FUEL PROPERTIES FROM CIU GUMAYUN THROUGH ADSORPTIVE DISTILLATION WITH NATURAL ZEOLITE AND SILICA GEL Farid Majedi; Galih Satrio; M. Shafwallah Al Aziz R.
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.793

Abstract

Bioethanol as an alternative energy source for fossil energy conversion. A potential source of bioethanol is Ciu Gumayun, a liquor with 25% alcohol content, which can be purified through adsorptive distillation using natural zeolite and silica gel as water adsorbents. The study aimed to determine the effects of adsorbent variations on the alcohol, water, and calorific value of bioethanol using a multistage adsorptive distillation process at 78°C with 2 liters of Ciu and 70 grams of adsorbent in each distillate. The results of the natural zeolite adsorption distillate: alcohol content of 67%, 79%, 88%, and 92%, with a final volume of 162 ml. In the silica gel adsorption distillate, alcohol content: 68%, 79%, 86% and 92%, with a final volume of 170 ml. The water content of both natural zeolite and silica gel distillates was 8%, with water volumes of 12.96 ml for natural zeolite distillate and 13.6 ml for silica gel distillate. The calorific value was 24,147 J/g for natural zeolite distillate and 24,704 J/g for silica gel distillate. From the alcohol content, water content, and calorific value, silica gel proved to be more effective in the adsorptive distillation process.
PENGARUH VARIASI DEBIT UDARA TERHADAP KARAKTERISTIK ALIRAN DUA FASE PADA AIRLIFT PUMP DENGAN SUDUT INJECTOR 15° Auzan Faizdaffa Hakim; Trisma Jaya Saputra; Nurmala Dyah Fajarningrum
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

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

Abstract

Airlift pump is a type of pumping system that utilizes the density difference between air and water to create two-phase flow, commonly applied in closed-loop circulation systems. This study aims to investigate the effect of varying air flow rates on the characteristics of two-phase flow in an airlift pump with a 15° swirl injector. The experimental method was used with air flow variations of 30, 40, 50, and 60 liters per minute (lpm), focusing on parameters such as superficial velocity of liquid and gas, liquid hold-up, gas volumetric quality, and observed flow patterns. The results show that increasing the air flow rate significantly raises the superficial velocities of both liquid and gas. Furthermore, liquid hold-up tends to decrease with higher air flow rates, while gas volumetric quality increases. The observed flow patterns include bubble, slug, and churn flows, each formed depending on the level of injected air flow. Overall, increasing the air flow rate has a significant impact on the hydrodynamic characteristics of the airlift pump system.
EFFECT OF BALLAST POSITION ON VERTICAL STABILITY AND EFFICIENCY OF A SMALL-SCALE BUOYANCY-DRIVEN UNDERWATER GLIDER Arie Sukma Jaya; Yusuf Arindyatama Putra
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.829

Abstract

Underwater gliders rely on buoyancy-driven motion for long-duration, energy-efficient ocean monitoring, but their stability and performance depend strongly on mass distribution. This study evaluates how ballast position affects vertical dynamics and buoyancy-driven energy-conversion efficiency in a 50 cm cylindrical, syringe-based buoyancy glider tested in a laboratory tank under sinking and floating conditions. Three ballast position ratios (λb = 0.2, 0.4, and 0.5) were selected (forward, intermediate, near-midpoint) to capture the transition toward stable vertical motion under reproducible, prototype-constrained conditions. Vertical velocity, buoyancy-driven energy-conversion efficiency (defined as useful buoyancy power divided by electrical input power), and orientation angles (pitch and roll) were measured using video tracking and an MPU6050 sensor. In this work, maximum efficiency refers to the ballast configuration that maximizes this energy-conversion ratio while exhibiting stable pitch and roll, which indicate vertical-motion stability. Results show that forward ballast (λb = 0.2) produced steep pitch angles exceeding 100°, reduced displacement to 15 cm, and yielded low efficiency (~13–15%). Shifting the ballast aft improved performance, with the midpoint configuration (λb = 0.5) achieving near-vertical alignment, symmetric ascent and descent, higher velocity (~0.045 m/s), and the highest efficiency (~23%). The relative roll response remained more stable across all cases, confirming that pitch dynamics dominate performance. The study concludes that optimal ballast placement near the midpoint maximizes stability and buoyancy-driven energy-conversion efficiency, offering a simple yet effective design principle for improving small-scale buoyancy-driven gliders.
OPTIMISASI PARAMETER MESIN PERAJANG UMBI PORANG TERHADAP HASIL KUALITAS POTONGAN CHIPS PORANG DENGAN METODE TAGUCHI Eli Novita Sari; Dian Ridlo Pamuji; Anggoro Bayu Wicaksono; Akhmad Afandi; M Fauzi Soulton; Syamsul Arifin; Bagiyo Herwono; Nuraini Lusi
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.831

Abstract

Porang tubers (Amorphophallus muelleri) have great potential as a food and health ingredient, but improper processing can reduce product quality. One important process is slicing the tubers to produce chips with uniform thickness. This study aims to optimize the parameters of a porang tuber slicing machine using the Taguchi method. The factors tested include the number of blades (2 and 4), the angle of the blades (10° and 15°), and the engine speed (600 rpm and 1200 rpm). The test results showed that the chip thickness was significantly influenced by these three factors. Signal-to-noise (S/N) ratio analysis and analysis of variance (ANOVA) showed that the blade angle contributed the most to the cutting results, namely 70.87%, followed by the number of blades 25.26%, and the engine speed 2.50%. The optimal parameter combination obtained was four blades, a 10° angle, and 1200 rpm, which resulted in an average thickness of 3.11 mm, in accordance with the standard for porang chips (2–8 mm). These results prove that the Taguchi method is effective for optimizing the parameters of the porang tuber chopping machine to improve the quality of the chopped results.
KARAKTERISTIK ALIRAN MINYAK-AIR DENGAN RASIO VISKOSITAS RENDAH DI PIPA HORIZONTAL DENGAN CFD Eli Kumolosari; Teguh Wibowo; Ndaru Atmi Purnami
Scientific Journal of Mechanical Engineering Kinematika Vol 9 No 2 (2024): SJME Kinematika Desember 2024
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v9i2.324

Abstract

Two-phase flow is crucial in various fields, particularly in the oil industry, where oil-water flows are common in offshore production wells. Oil is transported with water during its process, and Core Annular Flow (CAF) is one flow pattern that enhances transportation efficiency. This study uses CFD simulations to analyze oil-water flow with a low viscosity ratio in a horizontal pipe (L/d = 30). The aim is to determine the superficial velocities of oil and water (Jo and Jw) that form CAF flow patterns and calculate pressure drop and water hold up. Validation was conducted using experimental data for accuracy. Results show three flow patterns: stratified flow, CAF, and wavy flow. Pressure drop increases linearly with rising J values, from 0.0414 kPa at Jo = 0.21 m/s to 0.6898 kPa at J2 = 2 m/s. The relationship between pressure drop and water hold up is nonspecific, likely due to shear stress in two-phase flow. Pressure drop in the CAF pattern is lower than in stratified flow at the same J values, aligning with theoretical predictions.
INVESTIGASI SIFAT MEKANIK MODEL BIODEGRADABLE STENT BERBASIS BAHAN PLLA Muhammad Fadly Hi. Abbas; Sukiman B; Sandi Rais; Lita Asyriati Latif; Syarif Al Fajrin; Yulinda Sakinah Munim; Sahdar Rajak
Scientific Journal of Mechanical Engineering Kinematika Vol 9 No 2 (2024): SJME Kinematika Desember 2024
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v9i2.327

Abstract

Cardiovascular diseases are the leading cause of death worldwide, with diseases related to the narrowing of blood vessels being the primary cause of death in Indonesia. One solution for addressing this issue is the use of stents, specifically biodegradable polymer stents made from poly L-lactic acid (PLLA). The stent investigated in this study features a batik design (BT) with unidirectional struts (S><), combining open cell and close cell structures. This research employs a design analysis method using the finite element method (FEM) with the assistance of Abaqus student software. Data were collected by simulating the application of moments on each design combination of the stent in crimped and expanded configurations, with varying stent thicknesses of 120 µm, 130 µm, and 140 µm. The results indicate that, in the crimped configuration, the stent with a thickness of 130 µm produced the highest curvature index value, indicating the best flexibility. Meanwhile, in the expanded configuration, the stent with a thickness of 120 µm yielded the best flexibility results. This study makes a significant contribution to the development of more flexible and optimal biodegradable stents, with practical implications for improving stent design to reduce post-implantation complications and enhance clinical outcomes for patients with cardiovascular diseases.

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