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Jurnal Ilmiah Dinamika Rekayasa
Published by Universitas Jenderal Soedirman
ISSN : 25276131     EISSN : 25276131     DOI : https://doi.org/10.20884/1.jidr.2026.22.2.124
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Jurnal Ilmiah Dinamika Rekayasa is a journal, publish high-quality articles dedicated to all aspects of the latest outstanding developments in the field of engineering. Its scope encompasses the engineering of signal processing, electrical (power), electronics, instrumentation & control, telecommunication, Geological Engineering, Civil Engineering, Computing and informatics, and Industrial Engineering.
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Articles 50 Documents
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Evaluation of Operation and Maintenance Performance for The Community-based Drainage System in Pengambengan Bali I Gusti Ngurah Putu Dharmayasa; Putu Indah Dianti Putri; Andry Dwi Wibowo; Irma Suryanti
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2025.21.2.104

Abstract

Recurring inundation in the Jalan Raya Pengambengan area, Bali, indicates a decline in the drainage infrastructure's Level of Service (LoS), leading to road structure degradation. This functional failure is primarily driven by non-structural factors, specifically deficiencies in Operation and Maintenance (O&M) management due to high sedimentation rates and waste accumulation. This study aims to evaluate drainage management effectiveness using a quantitative approach with a correlational design. Data were collected through structured questionnaires from 30 respondents residing along the primary channel, supported by field observations of the channel's physical condition. Descriptive statistical analysis revealed a sharp disparity: the community possesses a very high understanding of infrastructure function (index 81.66%), yet actual maintenance participation remains low (index 59.83%). The Spearman Rank correlation test confirmed no significant linear relationship (rs​=−0,079) between technical literacy and maintenance behavior. These findings demonstrate a knowledge-behavior gap phenomenon, where the degradation of hydraulic capacity is caused by the diffusion of responsibility regarding public assets. The study concludes that restoring drainage function requires a strategic transformation from mere physical intervention to strengthened institutionalized participatory asset management to sustainably mitigate flood risks.
Product Specific Forecasting and Capacity Allocation: A Hybrid Model for Profit Optimization in Multi Variant Food Manufacturing Ichlasul Hadi; Nur Islahudin; Dewa Kusuma Wijaya
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.116

Abstract

This study addresses production planning challenges in food manufacturing SMEs characterized by heterogeneous demand patterns, limited historical data, and fixed capacity constraints. A hybrid model integrating product-specific demand forecasting and profit-maximizing linear programming is proposed to generate optimal annual production targets and profit projections. Historical sales data for four product variants are first preprocessed using the Interquartile Range (IQR) method to remove non-representative outliers. Demand patterns are then diagnosed as Beta-like, Exponential-like, or Triangular, guiding the selection of tailored forecasting methods: Moving Average (MA) for Product A, Single Exponential Smoothing (SES, α=0.5) for Products B and C, and Simple Average (SA) for Product D. The resulting forecasts serve as minimum production constraints in a linear programming model that maximizes total contribution profit under a 72,000-unit annual capacity. Implemented in POM-QM, the model yields a projected annual profit of IDR 213,514,600, with sensitivity analysis revealing a 7.7% improvement over volume-based planning and a shadow price of IDR 3,388/unit for capacity up to 75,000 units. This research demonstrates that operational excellence in resource-constrained environments stems not from model complexity, but from the thoughtful alignment of foundational quantitative methods with empirical demand behavior and financial logic.
Characterization Of Groundwater Facies Using The Piper Diagram In The Rakihan Lake Area, Sindang Danau District, South Ogan Komering Ulu Regency, South Sumatra Province Dianita Septia Wardani; Budhi Setiawan; Dede Nurohim
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.118

Abstract

Lake Rakihan is a water system located in the active zone of the Sumatran Fault that developed in a volcanic environment; as a result, its hydrogeochemical characteristics are influenced by local geological conditions. This study aims to identify the hydrogeochemical characteristics of groundwater and surface water in the Lake Rakihan area, South Ogan Komering Ulu Regency, South Sumatra, based on water chemistry analysis. The concentrations of major ions were converted to milliequivalents per liter (meq/L) and validated using the Charge Balance Error (CBE) method before being interpreted using a Piper diagram. The validation results showed that only samples C473-4, C473-5, and C473-6 met the ion balance criteria (CBE ≤ ±5%), while the other samples did not meet the criteria and were therefore not used in the interpretation. The Piper diagram indicates that samples C473-4 and C473-6 belong to the Ca–Mg–HCO₃ facies, while C473-5 falls within the Mixed Type facies between Mg–HCO₃ and Ca–Cl. The dominance of Ca²⁺, Mg²⁺, and HCO₃⁻ ions indicates that the hydrogeochemistry of the water is primarily controlled by water–rock interaction processes through the weathering of volcanic rocks. In general, the hydrogeochemical system in the Lake Rakihan area reflects the characteristics of local groundwater flow, which is still dominated by natural processes.
Evaluation of Soil Stiffness Parameters for Bored Pile Analysis Using Finite Element Method and Load–Settlement Curves Wawan Azwansyah; Roesyanto; Syiril Erwin Harahap
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.121

Abstract

Determining soil stiffness parameters is essential in bored pile analysis using the finite element method because they strongly influence deformation predictions. This study evaluates the stiffness parameters of the Hardening Soil constitutive model by validating numerical results against Static Load Test (SLT) load–settlement curves. Soil parameters were derived from field investigation data, laboratory testing, and empirical correlations, including c′ from Standard Penetration Test (SPT) values, ϕ′ from the plasticity index, Eoed and Eur from consolidation tests, and E50 from correlation with Eoed. Validation was performed using the Mean Absolute Percentage Error (MAPE) based on the gradients of the load–settlement curve during each loading phase. The results show that MAPE consistently decreased with increasing loading cycles and reached the highly accurate category (MAPE < 10%) in the final loading cycle. The gradient-based evaluation indicates that E50 does not fully represent the initial loading response, whereas Eoed and Eur adequately represent soil stiffness under higher stress levels and during the unloading–reloading phases. The proposed approach provides a more comprehensive framework for evaluating soil stiffness parameters in the Hardening Soil constitutive model than validation based only on total deformation.
Characterization of Rare Earth Elements Enrichment Based on Coal Calorific Value Variations Yudi Arista Yulanda; Wahyudi Zahar; Muhammad El Hakim; Jarot Wiratama; Putri Abby Larassati
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.122

Abstract

The accelerated transition toward clean energy has triggered a global surge in demand for Rare Earth Elements (REEs), while its supply chain remains heavily dependent on a single dominant producing nation. This constraint has compelled extensive exploration into alternative REEs feedstocks, particularly within coal deposits and Coal Combustion Residuals (CCRs) or Fly Ash and Bottom Ash (FABA). Although multiple studies on REEs occurrences within coal seams and FABA have been conducted, research directly correlating the influence of coal calorific value to REEs enrichment remains profoundly limited. This study addresses this critical research gap by analyzing the correlation between coal energy quality (calorific value) and REEs occurrences within the Oligocene Sinamar Formation at the PT Kuansing Inti Makmur concession area. The methodology integrated ASTM standard proximate analysis to determine fundamental coal quality parameters and Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) to quantify the concentrations of 10 targeted REEs elements. The proximate results indicated that sample KS100 exhibits a high ash yield (24.11% AR) with a lower gross calorific value (3,560 kcal/kg AR). Conversely, sample KS300 is characterized by a lower ash content (10.36% AR) and a higher calorific value (4,866 kcal/kg AR). Crucially, the ICP-OES analytical data revealed a compelling trend: REEs enrichment is notably more pronounced in the higher-energy quality coal seam (KS300). Cerium (Ce) and Lanthanum (La) emerged as the most dominant Light Rare Earth Elements (LREEs) in both horizons, with Ce concentrations reaching 114 ppm in KS100 and 150 ppm in KS300. Highly strategic elements essential for permanent magnet motors in electric vehicles, such as Neodymium (Nd), reached 91.76 ppm in KS300, which is nearly double the 50.51 ppm recorded in KS100. Furthermore, the total REEs concentration within the macroscopic parting layer was significantly lower (180.01 ppm) compared to the dispersed inorganic fraction within the coal matrices themselves. In conclusion, the novelty of this research demonstrates that REEs enrichment does not correlate linearly with the degradation of calorific value or total ash yield. Instead, it is suggested to be influenced by specific geological settings and the geochemical dynamics at the adjacent claystone boundaries.
Thermal Evaluation of Brick Wall Configurations Using FEM Simulation and Economic Analysis for Tropical Building Applications Eva Priyanti; Indra Rio Saputro
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.124

Abstract

Walls are essential components of the building envelope that regulate heat transfer and influence indoor thermal conditions in tropical buildings. However, the selection of brick wall configurations in Indonesia is generally based on construction cost and conventional practice rather than quantitative thermal performance evaluation. This study aims to evaluate the thermal performance and cost efficiency of commonly used solid clay brick wall configurations and to develop design recommendations based on different levels of solar heat exposure. The study employed thermal resistance (R-value) and thermal transmittance (U-value) calculations, Finite Element Method (FEM) simulations to evaluate temperature distribution and heat transfer behavior, and construction cost estimation through an integrated thermal–economic analysis. Three wall configurations were evaluated: half-brick wall, one-brick wall, and half-brick wall with an air cavity. The half-brick wall exhibited an R-value of 0.17 m²K/W and a U-value of 5.88 W/m²K, representing the lowest thermal resistance but the lowest construction cost (IDR 150,000/m²). The one-brick wall achieved an R-value of 0.34 m²K/W and a U-value of 2.94 W/m²K, with a construction cost IDR 280,000/m². The half-brick wall with an air cavity demonstrated the highest thermal resistance (0.50 m²K/W) and the lowest U-value (2.00 W/m²K), however it required the highest construction cost (IDR 320,000/m²). The findings indicate that the one-brick wall provides the optimum balance between thermal performance and cost efficiency, while cavity walls are recommended for areas exposed to high solar radiation in tropical buildings.
Depositional Environment Reconstruction and Diagenetic Evolution of Marly Carbonates in the Kepek Formation Based on Microfacies Analysis from the Rambutan River, Gunungkidul Lathifah Kusuma Melati; Istiana; Mochammad Prahastomi
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.130

Abstract

The Kepek Formation is a Neogene carbonate unit in the Southern Mountains of Java that records changes in depositional environments and diagenetic processes during the evolution of the carbonate basin. This study aims to reconstruct the depositional environment and diagenetic evolution of the Kepek Formation based on microfacies analysis of the Rambutan River outcrop, Gunungkidul Regency. The study involved measurement of a 14.6 m stratigraphic section, calcimetric analysis, thin-section petrography, microfacies analysis, planktonic foraminiferal biostratigraphy, and diagenetic analysis. The studied succession consists of clayey marl, limey marl, marl, marly limestone, and limestone with CaCO₃ contents ranging from 29.9% to 95.5%. Five microfacies were identified and correlated with the Ramp Microfacies Types (RMF), indicating that the Kepek Formation was deposited within a homoclinal carbonate ramp system comprising the open-marine inner ramp, mid-ramp, and outer ramp. The vertical alternation of microfacies records repeated migration of depositional belts in response to relative sea-level fluctuations during the Late Miocene–Early Pliocene. Diagenetic evolution progressed through the stages of eogenesis, mesogenesis, and telogenesis, which modified the original carbonate fabric and porosity after deposition. This study establishes a depositional and diagenetic evolutionary model for the Kepek Formation, demonstrating that the distribution of carbonate facies was controlled by repeated migration of depositional belts driven by relative sea-level fluctuations. These findings improve the current understanding of Neogene carbonate evolution in the Southern Mountains of Java by integrating microfacies, biostratigraphic, carbonate content, and diagenetic analyses.
Evaluation of Civil Engineering Students Readiness and Competency for Building Information Modeling (BIM) Implementation in The Workplace Aura Nita Mufidah; Redityo Januardi; Dani Nugroho Saputro
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.132

Abstract

The increasing adoption of Building Information Modeling (BIM) in the construction industry has driven the integration of BIM into higher education curricula. However, evaluations of students’ readiness and competence to implement BIM in the workplace remain limited. This study aims to evaluate the factors that influence students’ readiness and competence in implementing BIM in the workplace. The study employed a quantitative approach targeting undergraduate students in the Civil Engineering program at Jenderal Soedirman University who had completed the “Building Structural Drawing” course. Readiness was analyzed using SEM-PLS, while competency was evaluated through an unofficial Autodesk Certified User (ACU) Revit simulation. The results indicate that the learning ecosystem and academic self-confidence significantly influence students’ readiness, whereas BIM facilities and the comprehensiveness of course materials and assignments provided by instructors do not have a significant effect. The non-significance of facilities suggests that basic access to learning resources is not the main differentiating factor for readiness, while the gap between perceived readiness and ACU performance indicates that confidence developed through familiar modeling tasks may not transfer fully to the less-practiced conceptual and advanced features assessed by ACU. Most students do not yet meet the ACU Revit entry-level competency standards, particularly in the areas of elements and families, as well as stair and site modeling. Therefore, BIM instruction should be directed toward strengthening practical competencies through evaluations based on industry standards.
Decision Support System for Determining Priority Pilgrims at PT Hafiz Wisata Darussalam Based on The C4.5 Algorithm and Profile Matching Herlina Dianaria; Ermatita; Anggina Primanita
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.136

Abstract

The increasing competition among Umrah travel service providers requires companies to optimize the use of historical data to support decision-making. PT Hafiz Wisata Darussalam possesses approximately 500 historical records of Umrah pilgrims from the 2022–2025 period; however, these data have not been fully utilized, resulting in a subjective process for determining priority pilgrims. This study aims to develop a Decision Support System (DSS) for determining priority pilgrims by integrating the C4.5 algorithm and the Profile Matching method. The study employed 500 historical records consisting of the following attributes: previous pilgrim status, occupation, social media activity, Umrah package, age, and family group departure. The C4.5 algorithm was applied to classify priority pilgrims by identifying the most influential attributes through a decision tree, while the Profile Matching method was used to rank pilgrims based on their similarity to the company's ideal profile. The system was implemented using PHP and MySQL. The experimental results show that the C4.5 algorithm achieved an accuracy of 82.6%, a precision of 81.5%, a recall of 81.2%, and an F1-score of 81.4%. Out of 500 historical records, the system identified 233 priority pilgrims, who were subsequently ranked using the Profile Matching method to generate objective priority recommendations. The proposed system assists the company in identifying appropriate marketing targets, improving alumni pilgrim loyalty, and supporting more effective and data-driven decision-making.
The Determination of Disaster-Prone Areas Based on a Multifactor Approach on the Manglayang Catastrophe Volcano Edifice, West Java, Indonesia: English Putu Ayu Andhira; Faishal Aziz; Muhammad Ghozi; Teuku Yan Waliana Muda Iskandarsyah; Johanes Hutabarat; Hendarmawan
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.145

Abstract

Manglayang is an extinct volcano in West Java characterized by a horseshoe-shaped amphitheater morphology, suggesting a past volcanic sector collapse that generated debris-avalanche deposits. This study aims to identify evidence of sector collapse, characterize debris-avalanche deposits, and delineate stable, susceptible, and hazardous landslide zones. The methodology combines Digital Elevation Model (DEM) data, Desaunettes landform classification, geological field observations, lithological analyses, and slope stability assessment. The results reveal a southeast-facing amphitheater interpreted as the main sector-collapse scar. Hummocky landforms are widely distributed between 2 – 6 km from volcnic cone and supported by debris-avalanche deposits characterized by volcanic breccias with jigsaw-crack structures and abundant large boulders. The integration of geomorphological, lithological, and geotechnical parameters indicates that steep hilly terrains represent the highest landslide susceptibility, whereas hummocky terrains are generally stable under present conditions. The proposed multifactor approach provides a comprehensive framework for reconstructing ancient volcanic collapse processes and improving disaster-prone area mapping in extinct volcanic terrains.

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