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INDONESIA
Jurnal Teknologi Terapan
Published by Politeknik Negeri Indramayu
ISSN : 24773506     EISSN : 25491938     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Mechanical Engineering
JTT memuat naskah hasil-hasil penelitian di bidang teknologi terapan.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 292 Documents
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PENGARUH VARIASI TEMPERATUR INTERCRITICAL ANNEALING TERHADAP STRUKTUR MIKRO DAN KEKERASAN BAJA AISI 1020 DENGAN MEDIA PENDINGIN AIR GARAM Syanur, Farid Nanda; Paundra, Fajar; Prasetyo, Richo
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.791

Abstract

The development of technology in enhancing the mechanical properties of materials, such as hardness in metals, has progressed rapidly, particularly in steel. Based on its carbon content, carbon steel is classified into three categories: high-carbon steel, medium-carbon steel, and low-carbon steel. Low-carbon steel contains carbon in the range of 0.04% to 0.30%, one of which is AISI 1020 steel. This study aims to determine the effect of varying intercritical annealing temperatures on the microstructure and hardness of AISI 1020 steel using a saltwater cooling medium. The heating process was conducted using a furnace for 3 hours at different temperatures of 673°C, 723°C, 773°C, 823°C and 873°C. The tests performed included microstructure analysis and hardness testing. The hardness test was conducted using a hardness tester with the Vickers method, while the microstructure analysis was carried out using a trinocular metallurgical microscope. The results showed that the formed phases remained the same as in the initial specimen, consisting of ferrite and pearlite. The highest hardness value was obtained from the specimen heated at 823°C, reaching 243.49 HVN, while the lowest hardness value of 184.33 HVN was recorded in the initial specimen without heat treatment.
IMPLEMENTASI METODE QUALITY CONTROL CYCLE (QCC) UNTUK PENINGKATAN KAPASITAS PRODUKSI BODY CENTER PILLAR DI PERUSAHAAN OTOMOTIF Attaqwa, Yusita; Sari, Nita Winda; Kusmayadi, Didi
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.835

Abstract

This research was conducted at manufacturer of Toyota and Daihatsu brand cars. One of the products, the Body Center Pillar part, is the lowest productivity, where the target PPH is 50 pcs / hour, the actual PPH is 40 pcs / hour or still minus 10 pcs every hour. Necessary non valuable work that causes a high cycle time of 90 seconds, thus affecting production capacity. This study aims to determine the factors that cause Non-Valuable Work which results in a high Cycle Time of 90 seconds, which has an impact on low production capacity in line 6D-01-1 using the Quality Control Cycle (QCC) method. The subject of the study is the work process carried out by production operators where the productivity results are still low while the object of research is the measurement of process time or Cycle Time Part Body Center pillar consisting of 4M and 1E factors, namely: Machines, Materials, Methods, People, and Environment. After making some improvements of the engine factors and methods, use the Quality Control Cycle (QCC) method. Cycle Time decreased to 72 seconds so that PPH increased from 40 pcs to 50 pcs and production productivity in line 6D-01-1 increased.
PENGARUH VARIASI ARUS TERHADAP KETEBALAN LAPISAN OKSIDA DAN KECERAHAN WARNA ALUMUNIUM 6061 DENGAN METODE ANODIZING Umar, Mega Lazuardi; Maulana, Rizki; Utomo, Rochmad Eko Prasetyaning; Wardhana, Prabuditya Bhisma Wisnu; Finali, Asmar; Yaqin, Rizki Ilmal
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.692

Abstract

Anodizing on aluminum aims to change the metal surface into an oxide layer so that it becomes a decorative layer, increases its hardness mechanical properties, and is resistant to corrosion. Aluminum 6061 is one of the most common types of aluminum alloy used in various industrial applications. In this research, the anodizing process was carried out using Aluminum 6061, current variations of 1, 2, and 3 amperes were chosen to determine surface characteristics including the thickness of the oxide layer, microscope macro-observations, and color brightness. The results of the experiment show that the layer oxidation thickness increases with increasing current. The results shows that the greater the current used in the anodizing process, the darker the color will be.
INFORMATION RETRIEVAL BERBASIS LATENT DIRICHLET ALLOCATION PADA DATA KEKAYAAN INTELEKTUAL Hayati, Hashri; Alifi, Muhammad Riza
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.793

Abstract

The shift toward a knowledge-based economy underscores the importance of intellectual property (IP) management. Unfortunately, conventional keyword-based search methods often fail to capture the semantic relationships between concepts in documents—particularly complex ones like patents and copyrights. This study proposes a topic modeling approach using the Latent Dirichlet Allocation (LDA) method to improve the relevance and accuracy of information retrieval in IP data. The research developed 76 models based on four scenarios: with and without language translation, and with and without n-gram tokenization, using topic numbers ranging from 1 to 19. The best four models from each scenario yielded coherence scores between 0.4411 and 0.4581. Evaluation using Mean Average Precision (MAP) on the top 10 documents showed that the model without translation and with unigram tokenization (10 topics) achieved the best results with an average MAP of 78%. The findings indicate that language translation and n-gram tokenization do not significantly impact the coherence score. However, models without n-gram tokenization (bigram and trigram combinations) yielded relatively more semantically relevant search results based on MAP values. Automatic translation in this study resulted in lower MAP scores compared to models without translation.
SIFAT FISIKA PAPAN SEMEN DARI CAMPURAN LIMBAH BATANG SAWIT Nadapdap, Rosmaina Julianti; Rahayu, Yuyu; Husodo, Susilo Budi
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.806

Abstract

This study investigates the physical properties of cement boards made from oil palm trunk waste and evaluates the effect of varying cement-to-palm trunk waste ratios (70:30, 75:25 and 80:20). The independent variable is the cement-to-waste ratio, and the dependent variables include density, moisture content, thickness swelling, and water absorption. Results show that the density of the boards ranges from 0.70 g/cm³ to 1.02 g/cm³, moisture content from 6.79% to 14.49%, thickness swelling after 24 hours of immersion from 17.50% to 70.00%, and water absorption from 40.41% to 68.04%. Ratio 70:30 and 75:25 meet Indonesian National Standard (SNI) criteria for density and moisture content, but thickness swelling exceeds the standard, indicating poor dimensional stability. Increasing cement content improves density and reduces moisture content, but challenges remain in achieving dimensional stability and water resistance. These findings suggest that while oil palm trunk waste can be used in cement board production, further optimization, such as additive incorporation or feedstock modification, is needed to enhance water resistance and stability.
SISTEM PREDIKSI JUMLAH PENGUNJUNG WISATA PANTAI MENGGUNAKAN METODE DOUBLE EXPONENTIAL SMOOTHING Dian Febrianti, Siti Zumaroh; Harijanto, Budi; Saputra, Pramana Yoga
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.696

Abstract

Tourism plays an important role in the economic growth of a region. One of the factors that affect the tourism revenue sector is the number of visitors. An unexpected increase in the number of visitors can cause difficulties for tourism managers in providing the best facilities and comfort and safety for vacationing visitors. A prediction system for the number of visitors is needed as an overview of the level of tourism visitors for the coming period and can provide information to tourism managers to prepare better facilities and infrastructure and be able to manage revenue. Prediction of the number of visitors to Kelapa Beach Tourism can be done by applying the Double Exponential Smoothing method. In this study, the data used were 69 data on the number of monthly visitors to Kelapa Beach Tourism from 2018 to 2024. The test results show that the average minimum MAPE value generated is 16.36%. Based on the MAPE criteria scale, it is included in the good category and it can be concluded that this system helps the Kelapa Beach Tourism management team in predicting the number of visitors in the next period.
SISTEM PENGAJUAN ASSESSMENT KEBENCANAAN BERBASIS WEBSITE UNTUK MENINGKATKAN RESPONS TANGGAP DARURAT DI KABUPATEN KEBUMEN Khafidurohman, Khafidurohman; Fadjeri, Akhmad
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.797

Abstract

Kebumen Regency, located on the southern coast of Java, faces a high disaster risk due to its position in a tectonic subduction zone that can trigger major earthquakes. The presence of the Sempor and Wadaslintang dams further increases vulnerability to potential failures during seismic events. This study identifies the need for a rapid and accurate disaster assessment system to strengthen preparedness and emergency response. To address this, we developed a web-based system that enables both communities and government officials to collect real-time data from affected areas. System development, functionality testing, and performance evaluation were conducted to assess its effectiveness. The results show that the system delivers timely and accurate data, enhances coordination, and improves community resilience. This system is expected to be an efficient solution for disaster management in Kebumen Regency.
OPTIMALISASI DESAIN JIG VALVE SPRING COMPRESSOR DENGAN DOUBLE FLANGE UNTUK EFISIENSI PELEPASAN DAN PEMASANGAN KATUP MESIN Dewi, Renita; Fatin, Shafa Amatullah; Wijaya, Krisna Chandra; Ramadhani, Anisa; Heryana, Ghany
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.703

Abstract

This research aims to develop a new design of Jig Valve Spring Compressor that uses double flange, replacing the previous design that only uses one flange. This new design, which is still under development, has the potential to increase the speed and efficiency of the cylinder head overhaul process which has previously shown an increase in time efficiency of up to 82%. The development of this design is based on ergonomic principles using the OWAS  method to minimize the risk of musculoskeletal injuries and improve the working comfort of technicians during the engine valve removal and installation process.
STUDI NUMERIK KINERJA HEAT SINK BERBASIS ALIRAN DUA FASE DENGAN ETIL ASETAT SEBAGAI ALTERNATIF PENDINGIN CONCENTRATED PHOTOVOLTAICS Arirohman, Ilham Dwi; Naimah, Khoirun; Syaukani, Muhammad; Sabar, Sabar
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.814

Abstract

Concentrated Photovoltaic (CPV) technology offers the potential to enhance solar energy conversion by utilizing light focusing technology to increase the solar irradiation flux received by photovoltaic cells. On the other hand, as the solar energy density increases on a PV cell, the surface temperature of the PV also rises, which results in decreased energy conversion efficiency and the possibility of thermal fatigue. Therefore, a reliable cooling system is required for CPV. This study aims to evaluate the performance of a two-phase flow heat sink with ethyl acetate (C4H8O2) as the working fluid, which has a low boiling point and high heat of vaporization, making it quite effective for heat transfer. The method used is numerical simulation using Computational Fluid Dynamics (CFD) software. The simulation results show that the heat sink heat transfer effectiveness is 86.03%, with a thermal resistance value of 0.0073 . The highest temperature on the solid part is 105  showing an increasing trend but not significantly, while the average fluid temperature tends to remain constant at 55 . This indicates that the evaporation process is able to maintain the heatsink temperature at stable level.
INVESTIGASI KUALITAS UDARA RUANG PERKULIAHAN DI KOTA BANDUNG MENGGUNAKAN VENTILASI PASIF Rosulindo, Parisya Premiera; Prasetyo, Bowo Yuli
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.775

Abstract

Indoor air quality has become a critical concern due to its significant impact on human health, as 80%-90% of human activities are conducted indoorsThis study aims to assess the air quality in a university classroom in Bandung City that utilizes passive ventilation, focusing on CO₂ concentration, temperature, and humidity parameters. A quantitative approach involving observational and experimental methods was employed by varying the opening levels of passive ventilation into three conditions: fully open, half-open, and fully closed. The results indicate that fully open ventilation effectively maintains good air quality with stable CO₂ concentration, temperature, and humidity. Conversely, under fully closed ventilation conditions, there is a significant increase in CO₂ concentration, temperature, and humidity, which can reduce comfort and pose health risks.The findings emphasize the importance of managing passive ventilation to ensure a healthy and comfortable classroom environment.

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