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Riki Effendi
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SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin
Published by Universitas Muhammadiyah Jakarta
ISSN : 20889038     EISSN : 25499645     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin is an open access, peer-review journal which publishes original and review articles that advance the understanding of both the fundamentals of engineering science and its application to the solution of challenges and problems in mechanical engineering systems, machines and components. The editorial team aims to publish high quality and highly applied research and innovation that has the potential to be widely disseminated, taking into consideration the potential mechanical engineering that it could generate.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 269 Documents
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Design of Low Subsonic Wind Tunnel with Open Return System for Testing Wind Turbines at Low Airspeeds Yanel, Karnova; Yanto, Asmara
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 17, No 2 (2023): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.17.2.82-96

Abstract

The The Republic of Indonesia is rich in potential for renewable energy, including abundant wind energy. This study aims to design a subsonic open return wind tunnel for testing wind turbines at low airspeeds. The testing focus includes the evaluation of blade efficiency, bearing performance, and other aspects. Testing at low airspeeds (<5 m/s) is highly relevant to the wind conditions in Indonesia. The design process utilizes Computer Aided Design (CAD), while data collection and analysis are conducted through Computer Aided Engineering (CAE) simulations and theoretical calculations. The wind tunnel comprises components such as contraction, honeycomb, test section, diffuser, and support structure. Airflow over the turbine blades can be observed using smoke visualization in the test section. This research is expected to provide practical contributions to the development of low-speed wind turbines in Indonesia.
Analysis of the Performance of Moisture Reduction Rate in a Horizontal Mill Type Coffee Dryer Using a Suction Blower Yanel, Karnova; Hendra, Surya; Saferi, Rozi; Sulaiman, Sulaiman
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 1 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.1.38-43

Abstract

Coffee, originating in the 9th century Ethiopia and later expanding across North Africa and tropical regions globally, remains a crucial commodity. Indonesia, recognized for its robust coffee industry, ranks third worldwide in production, contributing 8% of the global supply. However, the drying process poses challenges to Indonesian farmers due to traditional methods and variable weather conditions. This research aims to evaluate a coffee dryer utilizing forced convection with a suction blower to optimize drying parameters for coffee beans. The study employs a horizontal mill dryer with a heated drum for drying experiments. Results demonstrate that the dryer effectively reduces the moisture content of post-harvest coffee cherries to 2%. In the initial test, 20 kg of coffee dried over 7.5 hours at 75℃ decreased from 61.66% to 5.3% moisture, while a subsequent test with 17 kg dried over 4 hours reduced from 36% to 2% moisture content. The findings conclude that the suction blower-equipped dryer meets Indonesian National Standards (SNI), achieving the requisite 12% moisture content for post-harvest coffee.
Study of the Effect of Welding Current Variations on Joint Strength and Microstructure of Cracker Lontongan Chopper Machine Rusdi, Firman Maulana; Istiqlaliyah, Hesti
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 17, No 2 (2023): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.17.2.120-129

Abstract

Welded joints in machine frame construction are prone to failure due to changes in material properties caused by the influence of heat, as well as the possibility of defects in welded joints. This is especially crucial in constructions subjected to dynamic loads, where the weld joint is a determining factor in the toughness of the material. This study aims to evaluate the microstructure, hardness, and tensile strength by applying variations in welding current in the Shielded Metal Arc Welding (SMAW) process. The research method included an experimental approach and literature study with careful observation. The findings of this study include: 1) The welding current strength significantly affected the microstructure arrangement of each tested specimen. 2) An increase in welding current resulted in an increase in the number and density of perlite structures in the Heat-Affected Zone (HAZ). In addition, an increase in welding current also resulted in an increase in hardness and tensile strength values. The average tensile strength successively increased from 90 A, 100 A, to 110 A, namely 320.11 MPa; 345.33 Mpa; 368.6 Mpa. 3) The results of statistical tests using the F-test on the tensile and hardness tests showed values of 0.023 and 0.040, respectively, indicating a significant difference in the hardness testing process with the application of current strengths of 90 A, 100 A, and 110 A. This research contributes to an in-depth understanding of the effect of welding current strength on the mechanical properties of materials, with important implications for improving the reliability of welded joints in machine construction.
Heat Transfer Analysis of Sandwich Plate System Application As Insulation Material for Fishing Vessels Hatches by Finite Element Method Syauqi, Syafiq Ahmad; Nugroho, Nur Yanu; Hardianto, Didik; Azhar, Ali
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 1 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.1.6-12

Abstract

Fish is a highly perishable food due to its suitability as a substrate for the growth of spoilage microbes, particularly bacteria. One method to maintain fish quality and extend its shelf life is preservation through a cooling system, where the duration of effective storage in the hatch is influenced by the quality of the insulation wall. Previous research modified the hatch insulation wall using a rice husk and white cement composition; however, these materials proved neither effective nor efficient in maintaining cooling temperatures. This study aims to determine the effect of heat transfer in a sandwich plate system on cooling time and temperature. Experiments were conducted using three variations in core layer thickness within a stainless steel-polyurethane-stainless steel configuration. The results indicated that at a temperature of 4°C, the maximum cooling times for each core layer thickness variation were as follows: variation 1 (3-20-3mm) lasted 62.5 hours, variation 2 (3-25-3mm) lasted 64 hours, and variation 3 (3-30-3mm) lasted 65.5 hours. The findings demonstrate that an increase in core layer thickness results in a prolonged maintenance of the cooling temperature within the hatch.
Design of a Web-based Cold Storage Temperature Monitor with Arduino Uno for Fish Quality Maintenance: Sensor-based Methodology and Innovative Contribution Hermawan, Ade; Andrian.Harahap, Doly Andrian; Daging, I Ketut; Dewi, Priyantini; Ridhwan, Rafif Zainun; Qadri, Munzir
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 17, No 2 (2023): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.17.2.161-170

Abstract

The development of a web-based cold storage temperature and humidity monitoring device using Arduino Uno aims to monitor room conditions, particularly in cold storage spaces, through a website. This device utilizes DHT11 and DS18B20 sensors, along with the Wemos D1 Mini module, integrated with the Arduino Uno microcontroller. Arduino configuration is performed through an application to send commands to other components. The research was conducted at PT. Indu Manis Gresik, East Java. Data collection and testing were carried out at the specified location. The test results demonstrate the device's efficient operation, transmitting testing data to the associated website. The accuracy of the DS18B20 temperature sensor testing reached 98.8%, while the DS18B20 humidity sensor achieved 99.35%.
Thermal Efficiency Analysis on Box Dryer Equipment in the Chemical Industry Savitri, Melisa Dwi; Sari, Dessy Agustina; Hakiim, Azafilmi
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 1 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.1.44-48

Abstract

Box dryers are widely utilized in the chemical processing, food, and agricultural industries for drying purposes. The efficiency of these dryers significantly impacts energy utilization. Low thermal efficiency suggests inefficient heat utilization compared to the energy required for drying. Therefore, analyzing thermal efficiency is crucial to optimize energy usage, enhance drying effectiveness, and identify avenues for improvement. This study employs a direct method to assess the thermal efficiency of a box dryer. Data from observations, operational parameters, and literature form the basis for calculating thermal efficiency. Results indicate thermal efficiency ranging from 89.00% to 92.00%, with a drying feed mass rate of 77–91 kg/hour over six hours of operation. These findings classify the box dryer equipment as highly efficient. The industry maintains this efficiency through periodic maintenance schedules and optimization of drying conditions. This research provides a foundational analysis of box dryer performance, aiming to streamline the drying process and minimize energy consumption. The outcomes contribute to ongoing efforts in industrial sectors to enhance operational sustainability and economic viability.
Optimization of Tambourine Kecer Punching Machine with Two Axis Movement System using Trimmer Machine to Improve Efficiency and Product Quality Lostari, Aini; Rian, Novi Indah; Amal, Fairus Ikhlasul
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 17, No 2 (2023): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.17.2.151-160

Abstract

Indonesian traditional arts, such as tambourine art, have become an inseparable part of cultural heritage. In Kaliwot Village Bungah Gresik, the process of making tambourines still relies on manual methods, especially at the stage of punching the kencer with a hand saw. As a result, the tambourine produced has a rough and uncomfortable surface. This research aims to improve the efficiency and quality of tambourine production through the design of a kecer punching machine using a trimmer machine. The experimental research involved designing, manufacturing, and testing the trimmer machine, focusing on the timing of tambourine kencer punching. The types of wood used include mango, jackfruit, and mahogany. The results included a drive engine power of 0.35 kW, a plan power of 0.45 kW, and variations in motor torque: mahogany 0.0197 Nm, jackfruit 0.0215 Nm, mango 0.0184 Nm. The average hollowing time ranges from 9.42 to 13.31 minutes, with a daily production capacity of 35-42 tambourine seeds, depending on the type of wood. Analysis of motor torque showed that higher motor revolutions increased torque during feeding, potentially affecting wood hardness. The conclusion of the study emphasizes that the use of a trimmer machine can increase the efficiency and production capacity of tambourines, making a positive contribution to the craftsmen in Kaliwot Village as well as the preservation of tambourine art as a whole.
Development of a Special Service Tool for Hydraulic Piston Maintenance on Excavator PC 210-10M0 Armas, Reza Febriano; Purwono, Hendro; Junaedi, Thomas; Alfauzi, Alfauzi; Santosa, Lintang Fuji
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 2 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.2.121-128

Abstract

Excavators are essential machinery widely utilized in mining, construction, plantation, and other industries. The Komatsu PC210-10M0, a small-sized excavator model, performs critical operations such as material digging and transportation. However, during component overhauls, particularly for the boom cylinder, bucket, and arm, significant challenges arise due to the absence of suitable tools for efficiently removing and installing hydraulic cylinder pistons. The current reliance on generic tools such as screw wrench sets (L-keys) is suboptimal, leading to inefficiencies, increased risks of workplace accidents due to tool slippage, and longer processing times. This study addresses these limitations by employing the Seven Up++ method to develop a specialized service tool specifically designed for hydraulic cylinder piston maintenance. The methodology encompasses three critical phases: Analysis, Solution, and Results, ensuring a systematic and innovation-focused approach. The developed tool securely positions itself on the piston cylinder, utilizing two pins inserted into pre-existing holes on the piston surface. The results demonstrate significant improvements: maintenance processing time is reduced by up to 70%, operational safety is enhanced due to the tool's secure attachment, and labor requirements are halved, with manpower reduced from two operators to one. These findings highlight the tool's potential to optimize maintenance operations and improve overall efficiency in the use of Komatsu PC210-10M0 excavators.
Analysis of Boiler Efficiency and NPHR With the Use of Sootblower in a 315 MW Coal-fired Power Plant Utama, Tri Yoga; Ruhyat, Nanang
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 2 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.2.80-89

Abstract

In the power generation sector, particularly in Indonesia, coal-fired power plants remain a key source of electricity. The Lontar Extension Coal-Fired Steam Power Plant (PLTU) (1x315 MW) is a significant facility that plays a critical role in ensuring a stable electricity supply to the Jakarta area and its surroundings. One of the major operational challenges faced by the plant is managing the ash produced during coal combustion, which leads to slagging and fouling on boiler tube surfaces. These phenomena impair heat transfer efficiency and increase fuel consumption. Given the growing emphasis on operational efficiency and sustainability in the power generation industry, addressing these challenges is of paramount importance. In this research, we conduct a comprehensive analysis of key performance parameters, such as Net Plant Heat Rate (NPHR) and boiler efficiency, at the Lontar Extension PLTU. A particular focus is placed on the use of soot blowers in the Heat Recovery Area (HRA) to mitigate slagging and fouling issues. This study offers unique insights by quantifying the benefits of soot blower operation, which resulted in a 0.71% increase in boiler efficiency and a 33.91 kcal/kWh decrease in NPHR at 100% load, and a 0.63% increase in boiler efficiency and 47.16 kcal/kWh reduction in NPHR at 50% load. Additionally, the soot blowers contributed to increased net power output and reduced coal consumption, highlighting the innovation in boiler cleaning techniques and their significant impact on fuel efficiency.
Optimisation of Air-water Harvester Machine Performance With Variations of Inlet Air Flow Velocities Mirmanto, Mirmanto; Wirawan, Made; Tarmisi, Ahmad
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 2 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.2.129-134

Abstract

In the dry season, some parts of Indonesia experience drought and clean water crisis which results in scarcity and difficulty in drinking water. One way to overcome this problem is to present a water-producing device from air called a water harvester machine. The purpose of this study was to examine the effect of the inlet air velocity of 4 m/s, 5 m/s, and 6 m/s on the mass of water produced and the rate of heat transfer. This study was conducted experimentally with R134a refrigerant working fluid, and a 1 PK rotary compressor and centrifugal fan. The results showed that the highest water mass, which was 5.99 kg, was obtained at an air velocity of 6 m/s. The highest heat transfer rate, which was 2080.2 W, was also obtained at a speed of 6 m/s. This can be caused by the high inlet air velocity, the inlet air mass flow rate is also high so that the water vapor content that enters is greater. As a result, the mass of water produced is greater and the rate of heat transfer that occurs is also greater.

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