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Piston: Journal of Technical Engineering
Published by Universitas Pamulang
ISSN : 25413511     EISSN : 26862247     DOI : http://dx.doi.org/10.32493/pjte.v5i2.19158
Core Subject : Engineering,
Aerospace Engineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Ansor Salim Siregar, Mulyadi Mulyadi, Syaiful Arief Analisis Kegagalan Laminasi Komposit Epoksi/Serat Karbon Pada Sayap Pesawat Tanpa Awak DOI: 10.32493/pjte.v5i2.18596 Parlindungan Pandapotan Marpaung, Herbert H. Rajagukguk Energi Mekanik Penggerak Poros Magnet Rotor Alternator untuk Pembangkit Listrik AC DOI: 10.32493/pjte.v5i2.19158
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 7 Documents
 1 
Search results for , issue "Vol. 8 No. 2 (2025)" : 7 Documents clear
Design and Construction of a Satay Grill Based on Thermoelectric Generator as a Source of Electrical Energy Nulhakim, Lukman; Syafrizal; Tauvana, Ade Irvan; Widodo; Nurhidayatuloh, Farhan
Piston: Journal of Technical Engineering Vol. 8 No. 2 (2025)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v8i2.48616

Abstract

Thermoelectric Generator is a technology used to generate electrical energy by utilizing the Seebeck effect, which occurs due to the temperature difference between the hot and cold sides. This study aims to determine the voltage generated by the thermoelectric generator from the process of burning satay using coconut shell charcoal. In this experiment, 6 pieces of thermoelectric generator type TEG1-241-1. 4-1. 2 were used which were connected in series. The pieces were mounted on aluminum material measuring 165 x 110 x 15 mm, and equipped with a heatsink at the bottom of the satay grill body for cooling. The heatsink used is an extrude model. Testing began when the charcoal had reached a red color. The maximum voltage generated reached 2,25 V in seven minutes, with a temperature difference reaching 5,9 °C. The temperature on the hot side was recorded at 102,2 °C, while on the cold side it was 96,3 °C.
Analysis of the Effect of Adding a Water Heater to the R290 Split Air Conditioning Instead of R22 Widodo; Nulhakim, Lukman; Syafrizal; Tauvana, Ade Irvan; Kurnia, Deva Arya; Asmoro, Purwandito Tulus
Piston: Journal of Technical Engineering Vol. 8 No. 2 (2025)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v8i2.48846

Abstract

The heat generated by split air conditioning (AC-Split) is sufficiently high to be utilized as a heat exchanger. The installation of a heat exchanger device, referred to as an Air Conditioning Water Heater (ACWH), is used to heat water in a tank by utilizing the waste heat from the condenser. In this study, refrigerant R290 will be used as a replacement for R22, with the aim of eliminating the Ozone Depleting Potential (ODP) and Global Warming Potential (GWP) associated with R22. Calculations are carried out to ensure the performance of the split AC by testing each refrigerant, R22 and R290, installed in the heat exchanger system. The test data is calculated and analyzed based on the performance on the vapor compression diagram. The results of the performance calculations of each R290/R22 refrigerant COP: 9.7/6.4, compression work: 28.7/25.72 kJ/kg, cooling effect, and electrical power: 881/976 Watts. The calculation results of R290 have better performance compared to R22, especially in electrical power. R290 is 10% lower than R22, COP is 34% higher, and it is ODP and GWP-free.
The Influence of Chloride Ion Concentration and Short Immersion Time on the Corrosion Behavior of C11000 Copper Alloy Priyotomo, Gadang; Anam, Ahsonul; Maldini, Noviar Rizky
Piston: Journal of Technical Engineering Vol. 8 No. 2 (2025)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v8i2.48881

Abstract

The effect of various chloride ion concentration (0 %, 1 %, 2 %, 3%, 4% and 5 % NaCl solution) on the corrosion behavior of the C1100 copper alloy was investigated with the immersion test (weight loss method). The effect of various immersion periods was also examined up to 14 days. After conducting immersion test, metal surfaces were observed with an optical microscope and the SEM analysis. The product of corroded copper was characterized using Energy Dispersive Analysis of X-rays (EDAX). On the basis of results, the magnitude of corrosion rate is higher in increasing the chloride concentration and immersion period, respectively. The increase of chloride concentration causes the copper oxide layer to become porous and cracked compared to without chloride addition. The reduction in the integrity of the copper protective layer took place due the presence of chloride ion.
Characteristics of Half Wave and Full Wave Power Supply Based on Proteus Application Simulation Sunardi
Piston: Journal of Technical Engineering Vol. 8 No. 2 (2025)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v8i2.48903

Abstract

This study uses a simulation-based approach with the Proteus application to discuss the characteristics of half-wave and full-wave power supplies. Power supplies are essential components in electronic systems that convert AC voltage into DC voltage. In this study, the design and simulation of half-wave and full-wave rectifier circuits were carried out to observe the differences in performance and characteristics of each type, such as DC output voltage value, ripple, and rectification efficiency. The simulation results show that the full-wave power supply produces a more stable DC output voltage with lower ripple compared to the half-wave power supply. Additionally, the rectification efficiency in full-wave circuits is higher because rectification occurs in every AC cycle, while in half-wave circuits it only occurs in half of the cycle. This simulation provides a clear overview of the advantages and disadvantages of each type of power supply, thus serving as a useful reference in the design of power supply systems for various electronic applications.
Multihop Data Transmission Using LoRa Technology Manalu, Istas Pratomo; Sigiro, Marojahan Timbul Mula; Simatupang, Frengki; Manik, Andreas A. P.; Sitohang, Necia G. A.; Pardede, Goldi
Piston: Journal of Technical Engineering Vol. 8 No. 2 (2025)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v8i2.48926

Abstract

The use of Long Range (LoRa) technology in Internet of Things (IoT) networks has grown rapidly to support applications that require wide coverage with low energy consumption. However, physical obstacles and indoor use often cause significant signal attenuation, reducing range and increasing energy consumption. To overcome these limitations, this study implements multihop communication using LoRa repeaters to extend network coverage. In this study, DHT11 sensors are used to measure air temperature and humidity, with data transmitted through a multihop scheme consisting of three LoRa devices: transmitter, repeater, and receiver. The purpose of this study is to analyze the performance of LoRa communication in a multihop scheme, focusing on measuring key parameters such as Received Signal Strength Indicator (RSSI), Signal-to-Noise Ratio (SNR), and Packet Loss. Point-to-point experiments showed that the RSSI was in the range of -103 dBm to -105.5 dBm, while in multihop, the recorded RSSI ranged from -102 dBm to -105 dBm. Meanwhile, the SNR in point-to-point ranged from -2 dB to -22 dB, and in multihop, the SNR value varied from -1.00 dB to -14.50 dB. At a distance of 1.5 kilometers, the point-to-point method suffers from a high packet loss of 65%, with only 23 out of 67 packets received, indicating inadequate performance. In contrast, the multihop method successfully reduces the packet loss to only 0.8%, with 33 out of 36 packets received, indicating improved data transmission quality and reliability. Tests show that the use of LoRa repeaters in multihop networks can significantly extend communication range and improve energy efficiency, with successful data delivery and performance that meets expectations. This research makes an important contribution to understanding the implementation of multihop LoRa networks, especially in the context of IoT applications that require wide coverage in congested environments.
Evaluation of Surface Roughness of ST-60 Steel Material After Turning Process With Variation of Rotation Herlambang, Bambang
Piston: Journal of Technical Engineering Vol. 8 No. 2 (2025)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v8i2.48933

Abstract

It is necessary to select the right material, set the right machine, and determine the optimal machining parameters to obtain the best quality product. In the lathe process, surface roughness is a very important factor and is the main indicator in assessing the quality of the workpiece. Surface roughness can be used to evaluate whether the workpiece meets quality standards or not. The lower the surface roughness value on the workpiece, the better the quality. Conversely, a high surface roughness value can have a negative impact on the performance of the workpiece mating components, because it increases friction on the machine elements that are in contact with each other. This study aims to determine the effect of variations in spindle rotation, feed speed, and feed depth on the level of surface roughness resulting from the lathe machining process. In addition, this study also aims to identify which factors contribute the most to achieving optimal surface roughness in the lathe machining process. The samples to be used is steel ST-60 with a diameter of 22 mm and a length of 120 mm in the form of a solid cylinder. The lathe machine to be used is Conventional Milling Machine equipped with Rotary Table, Dividing Head and Machine Clamp. The samples was turned at cutting depth 0,5 mm with rotation 140, 280, 560, 1.120 Rpm and feeding length 5 cm. The experiment was conducted with three repetitions on each combination of variables to ensure the accuracy of the data obtained. Surface roughness measurements were carried out horizontally on the surface of the workpiece by taking three times the data on each workpiece. The results show that the smoothest surface is achieved at low rotation speed 140 Rpm with Ra value 1.140 µm and the highest value of Ra is 2.690 µm at 560 Rpm. This is due to at low speeds in the turning process helps reduce excess cutting forces, heat, tool wear, and vibration, resulting in smoother surfaces.
The Analysis of Current Variations on Mechanical Properties and Microstructure of ASS 316L Welded Joints by TIG Welding Riswanda; Wahyudin, Faris Khoiri; Azmy, Ilham; Mulyana, Deni; Saragih, Albert Daniel
Piston: Journal of Technical Engineering Vol. 8 No. 2 (2025)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v8i2.48941

Abstract

Stainless steel 316L pipe welding joints are widely used in industry, especially in the Bio-Medical field. In order to develop research on this field, the Gas Tungsten Arc Welding (GTAW) process was carried out on the butt joint of ASS 316L. In this study, the ASS 316L pipe of 89 mm (3.5 inches), a thickness of 2.6 mm, and a length of 100 mm was investigated. The effect of current variations of 30, 40, and 50A with shielding gas and Argon backing gas were analyzed. ER316L have been selected as filler metal for GTAW process. The results of microstructural observations for all currents showed the formation of dendritic and widmanstanten structures in the weld metal and austenitic phases in the base metal. The mechanical tests has been conducted to find out the ultimate tensile strength and and hardness as well as observations of the macro structure in the weld metal (WM), heat affected zone (HAZ), and base metal (BM) areas. Visual observation of the 40A current showed more stable surface and penetration results compared to the 30 and 50A currents. Observations of the macro structure were correlated with the results of visual observations of the 40A current, indicating good fusion and no defects exceeding the standard. The highest tensile strength test results were obtained in specimens with a current of 50A of 659 MPa, followed by a current of 40A of 651 MPa, and a current of 30A of 649.3 MPa. However, the highest elongation was found in specimens with a current of 40A, which was 45.3%, while specimens with currents of 30A and 50A had the same elongation value of 39.3%. The general distribution of hardness in the weld metal area was greater than in the heat affected zone and base metal areas.

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