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Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Mechanical Engineering - Energy Conversion Engineering - Material Engineering - Manufacturing Technology - Mechatronics - Machine and Mechanism Design - Biomechanics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 22 Documents
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Search results for , issue "Vol 23, No 1 (2025): February" : 22 Documents clear
Performance evaluation of helix and spiral receiver geometries for a parabolic solar collector using cfd analysis Yonanda, Ahmad; Hakim, Naufal; Amrizal, Amrizal; Irsyad, Muhammad; Harmen, Harmen; Riszal, Akhmad; Sinaga, Jorfri Boyke; Haviz, Muhammad
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5709

Abstract

This comparative study evaluates the thermal performance of helix and spiral-shaped receivers in a Parabolic Dish Collector (PDC) system, a renewable energy technology that converts solar radiation into heat by concentrating sunlight onto a receiver. The geometry of the receiver significantly influences heat absorption and system efficiency. Using Computational Fluid Dynamics (CFD) simulations, this research compares temperature distribution, fluid flow velocity, and thermal energy transfer between the two receiver designs. Results indicate that the helix receiver provides more uniform heat distribution and achieves 2.6% higher thermal efficiency than the spiral receiver. However, the spiral receiver exhibits higher central flux and benefits from a simpler design and lower production costs. These findings offer insights into selecting optimal receiver geometries for improved solar energy utilization, supporting the advancement of efficient parabolic solar collector technology in renewable energy applications.
Thermal behavior of reusable ice cubes: Cooling efficiency and performance analysis Luthfi, Luthfi
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5521

Abstract

Reusable ice cubes as mini–ice packs have been widely used in the food industry and have played important roles in preventing waterborne diseases and microplastic contamination from using water ice cubes due to unhygienic water sources. This study investigates the thermal performance of various commercially available reusable ice cubes, assessing their cooling efficiency using a DS18B20 thermocouple sensor integrated with an Arduino microcontroller and a HIKMICRO B20 infrared camera. The primary objective is to evaluate and compare the cooling capabilities of different reusable ice cubes by measuring minimum temperatures and cooling times when placed in a water-filled glass. Experimental results indicate that stainless steel ice cubes exhibit faster cooling rates due to their higher thermal conductivity, whereas plastic ice cubes achieve lower minimum temperatures. The study further examines the influence of key parameters, including the number of ice cubes (N), water volume (V), and glass diameter (D). Empirical relationships for local plastic ice cubes were derived, showing dependencies of minimum temperature at Tmin ~ N1/5V1/3D5/2 and minimum cooling at tmin ~ N1/5V-1/5D3. These findings provide insights into the usage of reusable ice cube performance for various cooling applications.
IoT-Enhanced mechanical system for fogponic cultivation: Air circulation and environmental control Heltha, Fahri; Yunidar, Yunidar; Syahyadi, Rizal; Melinda, Melinda; Azhari, Rizki; Elizar, Elizar
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.6183

Abstract

Fogponic cultivation, a hydroponic technique that utilizes water mist for nutrient delivery, offers a significant advantage in water and nutrient efficiency. However, suboptimal air circulation, temperature, and humidity in the root chamber can hinder plant growth and nutrient uptake. This study develops an IoT-enhanced mechanical system to optimize environmental conditions in a fogponic root chamber for cultivating spinach (Spinacia oleracea) seedlings. An actuator in the form of a fan was integrated to regulate air circulation, and managed by a Proportional Integral Derivative (PID) controller for precise temperature and humidity control. The system was monitored using the IoT-based Blink application. The results showed that the PID controller effectively regulated environmental conditions, with optimized parameter values: Kp = 5.76, Ki = 0.576, and Kd =14.4. Performance comparisons with P, PI, and PD controllers demonstrated effective humidity control, achieving the target set point of 92% with rise times of 447–1090 seconds and steady-state errors of 0–0.5%. By integrating mechanical components such as the fan with IoT-based monitoring, the system achieves continuous adjustments to the environment, enhancing plant growth conditions. 
Physical and mechanical properties of aluminum matrix composites reinforced with copper powder via stir casting method Kholis, Nur; Purnama, Yudhi; Nugroho, Agung; Purwanto, Helmy; Hawari, Rizal
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5587

Abstract

The stir casting method is a widely used technique for producing metal matrix composites by incorporating reinforcement particles into molten metal. This study investigates the effect of copper (Cu) powder reinforcement on the microstructure and mechanical properties of aluminum matrix composites fabricated using the stir casting method. The base material consists of recycled aluminum from vehicle wheels, with copper added as a reinforcement to enhance the mechanical characteristics of the cast material. The casting process involved melting aluminum waste at 650°C, followed by the gradual addition of Cu powder in varying volume fractions (2.5%, 5%, and 7.5%) while stirring at a constant speed of 500 rpm for 5 minutes to ensure uniform distribution. The microstructural analysis was conducted using optical metallography, while tensile and hardness properties were evaluated using a Universal Testing Machine. The results indicate that the most uniform powder distribution was achieved at 5% Cu reinforcement, whereas the highest porosity was observed at 7.5% due to particle agglomeration. The highest hardness value (42.52 BHN) was observed at 2.5% Cu reinforcement, while the maximum tensile strength (111.7 MPa) was obtained at 5% Cu. However, an increase in Cu content beyond 5% led to a decline in mechanical properties due to increased porosity and reduced bonding efficiency. These findings highlight the importance of optimizing Cu content in aluminum matrix composites to balance mechanical strength and structural integrity.
The Effect of Clay, Alumina, and Starch Composition on The Characteristics of Thermal Insulation Cylinders Suluh, Sallolo; Bethony, Frans Robert; Simon, Christof Geraldi; Gallaran, Ferayanti Boas; Aket, Paulus; Pasampa, Enos
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.6176

Abstract

Efficient thermal insulation materials are crucial in improving performance, minimizing energy consumption, and maintaining safety in various industrial applications. This study examines the impact of multiple combinations of clay, alumina, and starch on the properties of thermal insulation cylinders. Five different composite samples were prepared by adjusting the percentages of clay and alumina while maintaining a consistent starch content. The samples were subjected to comprehensive tests to assess their water content, density, and porosity. Based on the findings, it was observed that as the alumina content increased, the water content and density of the composite materials decreased while their porosity increased. The sample labeled C6-A2 had the highest water content (9.19%) and density (1,087.04 kg/m³), while the sample labeled C2-A6 had the lowest water content (8.69%) and density (1,069.93 kg/m³). The range of porosity values observed was between 25.67% and 26.60%. It was observed that an increase in alumina content resulted in a corresponding increase in porosity. The findings indicate that the larger particle size and lower cohesion of alumina result in a more porous microstructure, affecting the material's overall properties. This study offers valuable insights into the composition optimization of clay, alumina, and starch to create customized composite materials suitable for various industrial applications. It focuses on achieving a delicate balance between water resistance, structural integrity, and thermal insulation
Open-source modeling and structural deformation analysis of a solar-powered charging station using freeCAD Kasturi, Kasturi; P, Regan Rahadian; Akhiriyanto, Novan; Hafiz, Muhammad
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5958

Abstract

Solar energy is a sustainable and widely available resource with minimal environmental impact and low maintenance requirements. Ensuring the structural integrity of photovoltaic (PV) module supports is crucial for safe and efficient operation. This study utilizes FreeCAD, an open-source software with finite element analysis (FEA) capabilities, to evaluate the deformation and stress distribution in a solar-powered charging station structure. Two thickness variations (3 mm and 1.5 mm) of hollow carbon steel supports were analyzed under identical loading conditions. Results indicate that reducing the thickness from 3 mm to 1.5 mm increased deformation by 69.81% (from 0.53 mm to 0.9 mm) and stress by 96.93%, both remaining within acceptable structural tolerance limits. These findings validate FreeCAD as a cost-effective alternative to commercial FEA software, leveraging open-source libraries like Python, Calculix, and Open Cascade Technology (OCCT) to perform complex simulations without expensive licenses or high-end hardware.
Effect of jackfruit seed extract (artocarpus heterophyllus) concentration on corrosion inhibition of galvanized steel in seawater Sudirmansyah Lubis; Muhammad Sayuti; Muhammad Muhammad; Rizka Mulyawan; Nurul Islami
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.6200

Abstract

This study confirms that immersion time and inhibitor concentration significantly affect the corrosion rate of galvanized steel in seawater. Without an inhibitor (0% concentration), the corrosion rate progressively increases, reaching a maximum of 0.4395 mpy after 30 days. In contrast, the addition of jackfruit seed extract effectively reduces corrosion, with the lowest rates observed at 0.0441 mpy (2%), 0.0330 mpy (4%), and 0.0192 mpy (6%) after 30 days. These results highlight the high efficiency of jackfruit seed extract as a natural corrosion inhibitor, demonstrating that higher concentrations and longer immersion times enhance corrosion protection. This study suggests that jackfruit seed extract is a viable, eco-friendly alternative to synthetic inhibitors, offering a sustainable solution for corrosion prevention in marine environments. Further research on long-term stability and large-scale applications is recommended to optimize its industrial implementation.
Impact of excess air on the performance and emissions of an ethanol-fueled si engine Ilminnafik, Nasrul; Saputra, Toni Haikal; Rozy Hentihu, Muhammad Fahrur
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.6228

Abstract

Ethanol-blended fuels, such as E60 (60% ethanol and 40% gasoline), have gained interest as an alternative to conventional fuels due to their potential to improve engine performance and reduce emissions. However, the effect of excess air on combustion characteristics remains a key factor in optimizing efficiency. This study investigates the impact of varying excess air levels on the performance and emissions of a 100 cc four-stroke spark ignition (SI) engine fueled with E60. The engine was connected to a Prony brake for performance testing, while exhaust emissions were analyzed using a gas analyzer. Results indicate that an excess air level of 22 L/m produced the highest power output (2.48 kW at 1600 rpm) and maximum torque (15.38 N·m at 1200 rpm). Additionally, at 22 L/m, the lowest fuel consumption of 0.110 kg/kWh and the lowest CO emissions were observed. However, at 23 L/m, a decline in performance was noted, likely due to incomplete combustion. The findings suggest that optimizing excess air in ethanol-fueled SI engines enhances performance and minimizes emissions. These insights contribute to the development of efficient combustion strategies for ethanol-based alternative fuels in small-scale transportation applications.
Finite element analysis of wear and deformation in casing rings for centrifugal pumps Susilo Handoko; Regan Rahadian P; Hafid Suharyadi; Totok Widiyanto
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5605

Abstract

The wear and deformation of critical components in centrifugal pumps, such as wear-casing rings, can be caused by the influence of operational lifetime and varying boundary conditions. To enhance the accuracy of wear and deformation predictions, this study integrates finite element analysis (FEA) with detailed field measurement data, including material wear rates and load conditions. The boundary conditions were applied to the CAD model of the wear-casing ring under varying operational loads. The simulation results indicate that the wear casing ring experiences a maximum deformation of 0.0037545 mm, with an estimated lifespan of 5.571 × 10⁷ cycles under normal loading and 0.5517 × 10⁷ cycles under doubled loading conditions. The installation clearance of the wear casing ring is 0.38 mm, with a tolerance of 0.05 mm. The deformation results fell within the acceptable limits for continued use, meeting the clearance standard. The contributions of this study lie in providing more precise wear predictions and insights into wear ring performance and an applicable predictive maintenance method that can be used to improve pump reliability and reduce maintenance costs. 
Implementation of a pid controller in a dc motor system: a case study on a floor cleaning robot Nanda, Rizki Aulia; Karyadi, Karyadi; Suhara, Ade; Tukino, Tukino; Guntur, Muhamad
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5543

Abstract

A floor-cleaning robot requires a stable and consistent movement to ensure effective cleaning. This study implements a Proportional-Integral-Derivative (PID) control system using Arduino Uno to regulate the DC motor’s speed and rotation. A well-tuned PID system ensures smooth and constant motion, optimizing the cleaning process. Without PID control, the robot’s movement can become inconsistent, reducing its cleaning efficiency. The research focuses on designing and implementing a PID system to achieve constant speed and rotation through programming. The selected PID parameters are Kp = 0.2, Ki = 50, and Kd = 0, effectively making it a Proportional-Integral (PI) controller. Experiments were conducted under two conditions: (1) unloaded motor testing—where the motor’s rotational stability was assessed without external load, and (2) loaded robot operation—where the robot was tested while cleaning a dirty floor. Results showed that the DC motor's unloaded speed was initially 5 RPM, stabilizing at 10.62 RPM. Under load, the robot's speed started at 0.2 RPM, peaked at 6.85 RPM, and maintained an average velocity of 4.85 cm/s. The robot demonstrated consistent motion in forward, left-turn, and right-turn maneuvers, achieving 13-degree rotations in 30 seconds. The robot was able to operate for 30 minutes, maintaining a stable speed between the 3rd and 22nd minute, before declining as battery power depleted. The findings confirm that the implementation of a PI controller effectively stabilizes motor rotation and enhances floor-cleaning efficiency. Additionally, this control method can be adapted to larger-scale robots and various DC/AC motor systems.

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