Jurnal Teknik

Thermal Comfort Determines User Subjectivity in Lamongan Grand Mosque

Mon, 30 Jun 2025 16:23:20 +0000

Mosque is a place of worship, which requires comfort to enhance the quality of worship, thermal comfort being one of the considerations in the prayer space of the mosque. This study aims to analyze the level of thermal comfort and thermal preferences of users in the interior space of the Grand Mosque of Lamongan. The method used is quantitative, collecting data through surveys at the Grand Mosque of Lamongan. Some of the data collected include personal data (clothing and activities) and measurements of environmental parameters; air temperature, air humidity, and wind speed. At the same time, users were asked to fill out a questionnaire asking about their perceived level of comfort at that time. The results of the study show that the interior space of the mosque has an average temperature ranging from 28.4 ºC to 29.08 ºC, while the survey questionnaire results indicate that 89.1% of respondents can accept the existing thermal conditions. This may be due to the fact that the temperature inside the mosque is much lower compared to the outdoor temperature.

Pemanfaatan Serabut Kelapa sebagai Bahan Pembuatan Rangka Drone

Mon, 30 Jun 2025 16:54:23 +0000

Drones are one of the latest technologies that are developing rapidly to provide positive benefits in society. Drone development can be done in various ways, including by improving the performance of the drone frame. Drone frames can be made of various types of materials, one of which is composite material that has mechanical properties that can be adjusted to needs. In this study, coconut fiber was chosen as the composite material because of its abundant availability, light weight, and environmentally friendly. Coconut fiber composites are made to be one of the alternatives for drone frames. To overcome its low strength, coconut fiber is used together with fiberglass to become a hybrid composite. Tensile tests, bending tests, and impact tests were carried out to determine the mechanical characteristics of the hybrid composite. The test results are then used as the basis for determining the drone design. Two types of tensile test specimens were made using the hand lay-up method where the type of fiber was varied to see the effect of variations in fiber types on the strength of the composite. The first type is a composite with fiber in the form of coconut fiber mats and fiberglass mats, and the second type is a composite with fiber in the form of coconut fiber mats and WR (Woven Roving) fiberglass. The tensile test results show that the second type of composite is more recommended because of its higher strength and more consistent results. The test results show that the second type of composite has a tensile strength of 32.7 MPa, a flexural strength of 82.4 MPa, and is able to absorb impact energy of 2.34 Joules. And finally, in this research, the hybrid composite was made into a drone frame and then integrated with electrical components so that the drone can fly

Analysis of Preventive Maintenance on Heavy Dump Suspension Using Reliability-Centered Maintenance Method

Mon, 30 Jun 2025 17:05:32 +0000

The suspension system on Heavy Dump (HD) vehicles is crucial in maintaining stability, comfort, and reliability when used in harsh environments. HD vehicles have a hydraulic-pneumatic suspension that uses nitrogen gas and oil to overcome the load and vibrations from the road. The suspension maintains vehicle components and protects the load, especially when crossing damaged or bumpy roads at high speed. This study aims to optimize preventive maintenance planning using the Reliability-Centered Maintenance (RCM) method and determine the suspension system's preventive activities to reduce breakdowns. In designing effective preventive maintenance, the RCM approach and related methods, such as FMEA, are used to identify critical machines as the focus of analysis. In addition, a statistical distribution approach is used to determine the optimal maintenance activity interval. Based on the analysis results, it was obtained that the data follows a lognormal distribution where the optimization of preventive maintenance on the suspension component is every 370-hour time interval for each machine working. Changing the time interval increased the reliability value from 34.09% to 93.60% before and after preventive maintenance. Preventive maintenance activities with a time interval of 370 hours to reduce unscheduled breakdowns in the form of adjusting suspension components

Optimalisasi Kinerja Ruas Jalan Dengan Metode PKJI 2023 dan Aplikasi PTV Vissim

Najwan Pratma, Rizal Aprianto, Joko Siswanto (Author) — Mon, 30 Jun 2025 17:25:32 +0000

The suboptimal performance of road segments is a major issue in the transportation system that causes congestion and a decrease in mobility efficiency. Kaliurang Road in Sleman Regency has poor road performance, resulting in disrupted inter-regional connectivity. Optimization of road segment performance is proposed through performance analysis and traffic engineering scenario simulation. PKJI 2023 is used to analyze performance and PTV Vissim 2025 is used for simulating the testing of 30 optimization scenarios. Data was collected through direct surveys and documentation from the Transportation Department. Simulation validation uses GEH for vehicle volume and MAPE for speed with an analysis of five variables (vehicle speed, travel time, vehicle density, occupancy rate, and relative delay). Scenario 30, with a combination of lane additions, road widening, removal of on-street parking, one-way systems, and vehicle type hour restrictions, resulted in the best optimization with an 11.57% increase in speed, a 30.93% reduction in travel time, a 67.74% reduction in density, a 64.76% reduction in occupancy rate, and a 92.66% reduction in relative delay. The optimization results can be used as a strategic step for stakeholders in formulating policies to improve road segment performance to support sustainable inter-regional connectivity.

Pengembangan Chatbot AI untuk Layanan Pelanggan PLN Menggunakan Algoritma Long Short Term Memory (LSTM)

Afandi Afandi, Wakhid Rokhayadi, Edi Susanto (Author) — Mon, 30 Jun 2025 00:00:00 +0000

Digital transformation requires customer service to be fast, responsive, and continuously accessible. To address this demand, this study presents the development of an AI-based chatbot employing the Long Short-Term Memory (LSTM) algorithm to enhance customer support for PLN. LSTM was chosen due to its effectiveness in capturing conversational context and understanding natural language patterns. The development process includes data preprocessing, model training, and performance evaluation using metrics such as accuracy, precision, recall, and F1-score. Experimental results on 133 test samples demonstrate an accuracy of 82.71%, with an average precision of 82%, recall of 77%, and F1-score of 77%, indicating reliable model performance. The chatbot is designed to handle common customer inquiries, including billing information, service disruptions, and other general services. This innovation is expected to improve PLN’s operational efficiency while delivering faster, more personalized, and dependable customer service, aligning with the demands of the digital era.

Analisis Besaran Erosi dan Stabilitas Lereng dengan Perkuatan Soil Nailing

Rasyid Balu, Indriati Martha Patuti, Fadly Achmad (Author) — Mon, 30 Jun 2025 00:00:00 +0000

The Gorontalo Outer Ring Road (GORR), with a length of 45.3 km, is a road constructed by cutting through the foot of slopes, posing a potential risk of landslides. Land-use changes on the slopes have been utilized by local residents for agricultural purposes and tourist attractions. This, of course, can affect the stability of the slopes surrounding the road. Therefore, this study aims to determine the magnitude of erosion and slope stability along the Gorontalo Outer Ring Road. In this study, erosion analysis was conducted using the USLE (Universal Soil Loss Equation) method, while slope stability analysis – both natural and reinforced with soil nailing – was performed using the Bishop method with the aid of Geo5 software. Based on the research results, the erosion analysis using the USLE method found that the average erosion rate on the northern slope is 79.77 tons/year, while the average erosion rate on the southern slope is 25.27 tons/year. The slope safety factor analysis shows that the southern slope under seismic load has a safety factor (FK) of 0.78, while the northern slope under seismic load has a safety factor (FK) of 0.66. Slope safety factor analysis with soil nailing reveals that the southern slope under seismic load has a safety factor (FK) of 1.87, and the northern slope has a safety factor (FK) of 1.73. Based on the analysis results, the slopes meet the required standards, with FK > 1.11 in accordance with SNI 8460:2017.

Optimalisasi Kecepatan Kendaraan Angkutan Sampah di Kota Manado

Meike Kumaat, Lucia Lefrandt (Author) — Mon, 30 Jun 2025 00:00:00 +0000

Waste management is a problem in all regions in Indonesia, including the city of Manado. Delays in waste transportation can cause odor problems and accumulation of waste that will disturb the surrounding environment. A good waste transportation system is needed, especially for the city of Manado, which is effective and efficient. The efficiency reviewed is in terms of Vehicle Operating Costs (BOK), so that it can be known exactly the BOK per kilometer of the garbage truck for each route reviewed.The BOK analysis uses PCI analysis to calculate the BOK per kilometer for dumptruck vehicles. The route taken by the garbage trucks operating in Malalayang Sub-district has 2 villages, namely Malalayang 1 West Village and Malalayang 1 Village. The first ritation of the truck goes to Wolter Monginsidi Street, transports garbage along the protocol road and returns to Sumompo Landfill. The second ritation of garbage trucks will go to the Intermediate Transfer Station (SPA) in Malalayang 1 Barat and Malalayang 1 villages to wait for garbage carts that transport door to door and then return to the Sumompo landfill. The results of the BOK research for trucks operating in Malalayang 1 West Village amounted to Rp. 292,463 for one day of operation. While the BOK for garbage trucks operating in Malalayang 1 Village is Rp. 283,526 for one day of operation

Pengaruh Beban Kerja Mental Terhadap Waktu Respon Pengemudi di Kondisi Lalu Lintas Pedesaan dan Perkotaan

Mon, 30 Jun 2025 00:00:00 +0000

Mental workload is one of the factors that affect driver safety. This study examines the effect of mental workload on truck driver response time in rural and urban traffic conditions. Mental workload was measured using the NASA-TLX questionnaire and physiological measurements using HRV and EEG. Response time was tested using detection simulation. The results showed that drivers experienced moderately high mental workload, with the urban environment showing cognitive enhancement based on alpha signals and LF variables. However, regression analysis found no significant relationship between mental workload and driver response time in either rural or urban environments. This study provides insight that while traffic conditions may affect the level of mental workload of drivers, the impact on response time is not always significant. These findings can serve as a basis for further research in understanding the relationship between mental workload, traffic conditions and driving safety.

Augmented Reality Sebagai Media Edukasi Pengenalan Anggota Keluarga Pada Anak: Studi Kasus Penggunaan Buku Interaktif

Mon, 30 Jun 2025 00:00:00 +0000

This study develops an educational media based on Augmented Reality (AR) in the form of an interactive book to introduce family members to early childhood learners. AR technology enables more engaging visual interaction compared to conventional learning methods. The research method used is Research and Development (R&D) with stages including needs analysis, design, development, implementation, and evaluation. The trial results indicate that this media significantly improves children's understanding of family members, with a statistically significant increase in post-test scores compared to pre-test (p < 0.05). Evaluations from teachers and parents also show that this media is effective, engaging, and easy for children to use. Therefore, AR-based interactive books have the potential to be an innovative solution in early childhood education.