Jurnal Teknik

Thermal Comfort Determines User Subjectivity in Lamongan Grand Mosque

2025-07-25T01:39:44+00:00

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

2025-06-30T17:06:06+00:00

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

2025-06-30T17:06:06+00:00

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

2025-07-01T05:12:44+00:00

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)

2025-07-01T02:24:45+00:00

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

2025-07-01T02:24:25+00:00

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

2025-07-01T02:24:07+00:00

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

2025-07-01T02:23:51+00:00

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

2025-07-01T02:23:25+00:00

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.

Analisis Dampak Lingkungan dan Sosial pada UMKM Menggunakan Metode Interpretive Structural Modeling

2025-07-07T07:27:33+00:00

Small and Medium Enterprises (SMEs) in Indonesia make a significant contribution to the national economy, particularly in addressing poverty and unemployment. One su`ch SME in Mojokerto, which produces cassava crackers, faces various environmental and social issues in its production process. This study aims to analyze and classify these factors using the Interpretative Structural Modeling (ISM) method. The results of the ISM hierarchical structure analysis show that the factor "Employees parking vehicles haphazardly" is at level three, "Drying process obstructs public road access" is at level two, while "Unpleasant odor during drying," "Noise from machinery during production," and "Air pollution from the frying process" are at level one. The MICMAC diagram indicates that "Unpleasant odor during drying" and "Air pollution from the frying process" are the most critical factors and have the highest priority due to their significant influence on other elements.

Lean Manufacturing dengan PDCA untuk Peningkatan Kualitas Gula Semut Aren di PT. XYZ

2025-07-24T03:28:20+00:00

Gorontalo has ±496,000 palm trees, yet 60% are unprocessed, and mostly used for alcohol. PT XYZ is here to shift farmers' focus to Aren Ant Sugar production. Its derivative products include Aren Ant Sugar, Batok, and Liquid. Batok Sugar is the result of reprocessing defective products from Ant Sugar which certainly requires additional time and costs. This research aims to identify the cause of the defect, which is a lumpy texture due to the pH of the nira water being below the standard (6-7). The Lean Manufacturing method with PDCA was applied as a solution, along with the innovation of using rambusa fruit net (Passiflora foetida) as an antibacterial and antioxidant. As a result, the DPU value dropped from 0.0845 to 0, proving an improvement in quality and production focus in Aren Ant Sugar.

Efisiensi Kinerja Rantai Pasok Menggunakan Metode Data Envelopment Analysis

2025-07-24T03:50:03+00:00

The supply chain sector is one of the most determining the company's ability to maintain its business operations. PT. Sentra Mulia Sejahtera has never conducted performance measurements on its supply chain flow, so it is not yet known how efficient its supply chain performance is. The purpose of this study is to analyze the level of efficiency of supply chain performance and propose improvement strategies for the inefficient supply chain performance of PT. Sentra Mulia Sejahtera using the Data Envelopment Analysis method. The results showed that at the supplier level there was 1 DMU that was already efficient, 2 DMUs were marginally efficient and 2 other DMUs were still inefficient. Meanwhile, at the company level, there are 4 DMUs in an inefficient condition, DMU 3 is the DMU with the lowest efficiency value of 38.5%. The improvement strategy for inefficient suppliers is to reduce the value of the input variables. The improvement solution for the company based on the results of the potential improvement calculation must reduce the cash to cash cycle time and lead time for order fulfillment by reducing the length of the payment agreement from the distributor.

Desain Model Pengendalian Kualitas produk Radiator berbasis Six Sigma dan Acceptance Sampling

2025-07-24T08:23:40+00:00

PT KJI is a manufacturing company engaged in the production of car radiators. The quality of the products is the main focus to meet customer standards. The company faces a high Defect rate that exceeds the tolerance limit of 3%, affecting both process efficiency and customer satisfaction. This study aims to identify the root causes of product defects, calculate the sigma level, and design improvements to reduce the defect rate. The Six Sigma method with a DMAIC approach is used to analyse and control the quality of the production process, supported by the application of acceptance sampling based on AQL standards. The analysis covers the production process, inspection systems, and machine maintenance conditions. It was found that the lack of inspection on incoming materials and finished products, as well as irregular maintenance schedules, are the main factors contributing to the high defect rate. Proposed improvements include enhancing inspections of incoming and outgoing products according to AQL and implementing a more consistent machine maintenance schedule. After the implementation of the proposed improvements, there was a significant reduction in the number of Cacative products. The average sigma level increased from 3.8 to 4.7. This improvement had a positive impact on product quality, production process efficiency, and the reliability of the quality control system at PT KJI.

Optimasi Rute Distribusi ES Kristal Dengan Metode NN Dan LS UMKM XYZ

2025-07-24T13:29:23+00:00

This study aims to optimize distribution routes for Micro, Small, and Medium Enterprises (MSMEs) engaged in the production of premium ice crystals. The Nearest Neighbor (NN) method is used to find the initial route by selecting the closest locations in sequence, while Local Search is used to improve the route found by searching for better local solutions through exchange or improvement of the delivery sequence. The testing was conducted using distribution data from several customers and delivery locations. The research results show that the distribution route for UMKM Es Kristal Premium, when applying the Nearest Neighbor and Local Search methods, resulted in a reduction in delivery distance from 40.3 km to 3.74 km, with a savings of 16.28% for the urban area, and from 52.5 km to 33.1 km for the Limboto-Telaga area, with a savings of 36.95%. Additionally, this method also reduces transportation costs, with initial transportation costs of Rp. 100,000.00 decreasing to Rp. 66,840.00, representing a cost reduction of 33.16%. This method can optimize time and operational cost savings, which can have a positive impact on UMKM Es Kristal Premium in enhancing their competitiveness and service to customers.

Design of Smart Iron Plate Heating Machine Using Quality Function Deployment Method

2025-07-25T01:06:00+00:00

The number of gloves entering the ironing department is greater than the number of gloves that are ironed, causing a lot of accumulation of gloves that have not been ironed. Based on this problem, a problem identification was carried out using the IDEF0 method. Based on the results of the discussion, the solution to the existing problem is to design an ironing plate heating machine using the Quality Function Deployment (QFD) method which can reduce ironing process time and increase productivity. After the machine was completed, a test was carried out where the results of the gloves from the ironing plate heating machine had met the standard operating procedure. In addition, the standard ironing time decreased where initially when using a conventional iron it took 47.68 seconds to iron. While when using an ironing plate heating machine it took 36.14 seconds to iron. The number of gloves produced in 4 hours of using a conventional ironing machine produced 300 gloves while the ironing plate heating machine produced 350 gloves.

Potential Soil Lateral Spreading and Settlement Induced Liquefaction in Indramayu Area

2025-07-25T16:37:38+00:00

An earthquake that had occurred in the Indramayu area in 1847 caused buildings and facilities to collapse, lives were lost, gaps 1-2 feet wide formed in the ground, all buildings in the fort area were severely damaged and could not be rehabited. Based on simulations and evaluations of previous research results in the same area, the source of the damaging earthquake is likely to originate from a shallow earthquake source currently referred to as the Baribis Fault Segment. This study aims to establish a relationship between past earthquake disasters and the potential for their occurrence in the future with the same earthquake source. In this research, we used data from field tests in the form of standard penetration test (SPT) values at 4 technical drilling points, as well as cone penetration test (CPTu) results at 10 test points and CPT results at 13 test points. The three results from the field tests are used in physical and mechanical analysis, as well as safety factors against liquefaction using different PGA value approaches, and the values of these safety factors are considered in estimating potential soil lateral spreading and settlement. The results of the analysis showed that sand sediment layer (fluvial and beach ridges) and sandy sediment layer (delta front silty sand) in the study area had the potential against liquefaction with specific soil settlement and lateral spreading values, depending on PGA values. The highest potential value soil settlement against liquefaction is 0.301 m, while the highest lateral spreading potential of the soil is 0.645 m.

Pengaruh Desain Cerobong Boiler Terhadap Sebaran Emisi Partikulat Menggunakan Perangkat Pemodelan Aermod

2025-07-25T16:57:15+00:00

Particulate emissions from boiler activities are known has a negative impact on health, such as causing respiratory problems. The particulate emission dispersion model generated from the chimney of a boiler can be known using the aermod modeling tool, through this model, the concentration of particulate emissions received by the environment around the activity can be studied. The design of the boiler chimney is also known to affect the concentration of particulate matter that is dispersed. This study aims to determine the effect of chimney design on the distribution of particulate emissions from boilers activities. The particulate dispersion model was carried out using the aermod modeling tool with several fixed variables, namely climatic conditions, the location of chimney and reseptor, and particulate emissions coming out from boiler, while the independent variables were variations in chimney diameter and heights. The results of particulate distribution model show that chimneys with a diameter of 2 meters and a height of 28 meters have a wider distribution of 93.96 meters from the emission source with a maximum concentration of 29.41 µm/Nm³. While the lowest concentration received by the receptor of 2.51 µm/Nm³ came from the chimney with a larger diameter and higher chimney.

Perencanaan Lalu Lintas Pengembangan Pelabuhan Perikanan Likupang

2025-07-25T17:10:40+00:00

The development of new land uses that become activity centers will cause traffic generation. The construction and operation of the Likupang Fishing Port in North Minahasa Regency, North Sulawesi Province has caused an increase in traffic movements. The traffic generation resulting from the development of fishing port infrastructure is classified as high traffic generation. The aim of this research is what the traffic management plan is for developing the Likupang fishing port. The research method/design begins with a background to the problem and establishing research objectives. Primary data in the form of traffic flow characteristics data consisting of volume, speed, density of traffic flow on the affected road sections. Geometric inventory data of roads, passengers getting on and off ships is calculated as a person generation calculated manually using a survey form. Secondary data in the form of population data, public transportation, road networks. The technique for collecting traffic volume data by counting the number of vehicles passing on the observation line is carried out by recording all vehicles that pass a point on the affected road section, using a hand tally counter and a survey form. The surveyor will count each type of vehicle based on its classification. The technique for collecting data on traffic flow speed

is carried out manually, setting the length of the road section at 50 meters and speed calculations are carried out by 2 surveyors using the flag method. The collection of traffic flow and generation was calculated during the survey period from 06.00 – 19.00. Analysis of volume, speed, density of traffic flow and traffic flow simulation using the MKJI 1997 method. Performance of the local road section of Likupang Fishing Port, existing condition of service level B and speed of 10 km/hour. Increased traffic flow in the future will cause the service level of the Likupang Fishing Harbor collector road to decrease to service level C.Traffic management plan during the construction period a) 1 warning light warning sign. b) Installation of 2 caution signs in and out of project vehicles. c) Placement of car wash, d) guard post, e) construction material stockyard. Traffic planning at the Likupang Fishing Port when it is built and will be operated is to install - 1 caution sign, - 1 unit of entry sign, - 1 exit sign, - 1 stop sign, - 1 guard post. Traffic management planning for the construction of the Likupang Fishing Port will provide services that provide comfort to road users.

Enhancing Compressive Strength of Self-Compacting Concrete (SCC) through Rice Husk Ash and Superplasticizer Incorporation

2025-07-25T17:22:52+00:00

The increasing demand for sustainable construction materials has encouraged the utilization of alternative materials, such as rice husk ash (RHA), and the use of chemical admixtures like superplasticizers in self-compacting concrete (SCC). This study aims to evaluate the effects of RHA and superplasticizer incorporation on the fresh and hardened properties of SCC, focusing on flowability, segregation resistance, and compressive strength. The experimental program involved three SCC mixtures: normal concrete, and SCC with 4% and 8% RHA and superplasticizer by cement weight. Fresh concrete properties were assessed using the slump flow, V-Funnel, and L-Box tests, while compressive strength tests were conducted on cube specimens after 28 days of curing. The results indicated that the addition of 4% RHA and superplasticizer enhanced the compressive strength to 34.02 MPa and maintained flowability within the specified limits, with an average slump flow diameter of 675–697 mm, V-Funnel time of 7.35–8.72 seconds, and L-Box ratio of 0.84–0.85. However, the 8% RHA mixture exhibited a decline in compressive strength (28.51 MPa), highlighting the detrimental effects of excessive superplasticizers on particle cohesion. Furthermore, the use of RHA reduced concrete density, showcasing its potential for lightweight construction applications. These findings confirm that a 4% RHA and superplasticizer dosage optimizes SCC performance, supporting sustainable construction through resource-efficient and durable materials. The study underscores the need for precise mix designs and suggests broader applications of RHA and chemical admixtures in advancing green concrete technologies.

Evaluasi Postur Kerja Pemotongan Tahu Menggunakan Metode RULA di UMKM Handayani

2025-07-25T17:28:02+00:00

MSMEs are one of the main pillars of Indonesia's economic growth, especially in the food sector. However, many production processes are still carried out manually and are not ergonomic. One such example is Mrs. Hj. Handayani's tofu MSME, where the manual tofu cutting process causes a non-ideal working posture and risks causing Musculoskeletal Disorders (MSDs). This study aims to initiate posture work using the Nordic Body Map (NBM) and Rapid Upper Limb Assessment (RULA) methods, as well as designing an ergonomic cutting tool based on a pneumatic system adapted to local anthropometric data. The evaluation was conducted on one worker through direct observation and body angle analysis using Angulus and CATIA V5 software. The initial analysis results showed an NBM score of 57 and a RULA score of 6, indicating the need for work posture improvements in the near future. After the implementation of the tool, the RULA score decreased to 2 and cutting time was reduced by 45%, proving the tool's effectiveness in improving ergonomics and work productivity in the MSME environment.