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Dedi Purwanto Indra Kusuma
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RESWARA: Jurnal Riset Ilmu Teknik
Published by Lembaga Penelitian dan Pendidikan (LPP) Kalibra
ISSN : -     EISSN : 30259444     DOI : https://doi.org/10.70716/reswara
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
RESWARA: Jurnal Riset Ilmu Teknik is a leading scholarly platform that examines the strategic role of engineering disciplines in advancing the Sustainable Development Goals (SDGs). The journal is dedicated to publishing recent research, innovations, and engineering solutions that support sustainable development. The editorial board welcomes manuscripts based on theoretical frameworks and empirical research. The journal scope covers scientific knowledge and research-based information, including applied research and recent developments in engineering research and development. The primary focus includes Civil Engineering and Spatial Planning, Industrial Engineering, Electrical Engineering and Informatics, Earth Science Technology, and Naval Architecture. All manuscripts published in RESWARA undergo a double-blind peer review process. The final decision on manuscript acceptance rests with the Editorial Board, based on recommendations from independent peer reviewers.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 131 Documents
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Karakterisasi Material Geopolimer Berbasis Fly Ash, Kapur Padam, dan Tanah Laterit Muh. Sayfullah S; Antonius Antonius; Prabowo Setiyawan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.581

Abstract

The development of environmentally friendly construction materials has become one of the key efforts to reduce dependence on Portland cement, which significantly contributes to global carbon emissions. This study aims to characterize the constituent materials of a geopolymer system based on fly ash, hydrated lime, and lateritic soil sourced from Gowa Regency, South Sulawesi, and Baubau City, Southeast Sulawesi, Indonesia. The research employed a quantitative experimental approach through the analysis of the physical, chemical, and microstructural characteristics of the materials. Physical characterization included moisture content, specific gravity, Atterberg limits, and particle size distribution tests, while chemical and microstructural characterization was conducted using X-Ray Fluorescence (XRF) and Scanning Electron Microscopy (SEM). The results indicated that the lateritic soils were predominantly composed of fine particles, with Al₂O₃ as the major component in the Gowa sample (49.38%) and SiO₂ as the dominant component in the Baubau sample (67.82%). The fly ash samples exhibited high contents of SiO₂, Al₂O₃, and Fe₂O₃, while the Jeneponto fly ash contained a higher CaO content than the Baruta fly ash. SEM observations revealed particle morphologies that have the potential to support the geopolymerization process. Overall, the combination of lateritic soil, fly ash, and hydrated lime demonstrates favorable characteristics for utilization as locally sourced geopolymer raw materials, offering a promising alternative for sustainable and environmentally friendly construction materials.
Optimasi Biaya Distribusi dan Penentuan Lokasi Gudang Baru di PT. XYZ Menggunakan Metode Centre of Gravity Agus Wahyudi; Tri Ngudi Wiyatno; Ikhsan Romli
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.647

Abstract

This research is motivated by the high cost of distribution which is the main problem in the logistics system at PT. XYZ as a manufacturing company with an extensive distribution network. This research aims to analyze the current distribution process, determine the optimal warehouse location, and measure the potential distribution cost efficiency that the company can obtain. The theoretical foundations used include logistics management, distribution systems, distribution costs, warehouse location determination, distribution optimization, and the Center of Gravity (CoG) method. The research method used is a descriptive quantitative method with data collection techniques through observation, interviews, documentation, and literature studies. The data analyzed includes customer coordinate points, distribution volume, distribution distance, and distribution costs. Data processing is carried out using the Center of Gravity (CoG) method with the help of Microsoft Excel to determine the most optimal warehouse location point. The results of the study show that the recommended warehouse location is in the Salatiga area, Central Java. The location was able to reduce the total distribution cost from IDR 4,272,425,000 to IDR 3,798,400,000, resulting in savings of IDR 474,025,000, able to reduce distribution costs by 11.09%. Thus, the Center of Gravity (CoG) method is proven to provide a more strategic alternative to warehouse locations and can increase the efficiency of the company's distribution costs.
Pengaruh Rasio Diameter Inti High-Damping Rubber terhadap Kekakuan Horizontal dan Rasio Redaman Isolator Elastomerik pada Regangan Geser 150% Dimas Rizky Tanaya; Ahmad Basshofi Habieb
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.524

Abstract

Lead cores are commonly used in seismic isolators to enhance energy dissipation; however, their toxicity and environmental impact have encouraged the development of lead-free alternatives. This study evaluates the effect of the High-Damping Rubber (HDR) core diameter ratio on the horizontal stiffness and equivalent damping ratio of elastomeric seismic isolators subjected to 150% shear strain. Three specimen configurations were examined: A1 without an HDR core, B1 with a 40 mm HDR core, and C1 with an 80 mm HDR core. All specimens had an outer diameter of 200 mm and consisted of eleven 4 mm rubber layers reinforced by ten 2 mm steel plates. Displacement-controlled cyclic lateral tests were conducted. Horizontal stiffness was calculated from the maximum and minimum force-displacement responses, while the equivalent damping ratio was obtained from the hysteresis-loop area. The horizontal stiffness values of A1, B1, and C1 were 0.61, 0.57, and 0.48 kN/mm, respectively, and their equivalent damping ratios were 6.89%, 9.18%, and 10.27%. Compared with A1, the stiffness of B1 and C1 decreased by 6.56% and 21.31%, whereas their damping ratios increased by 33.24% and 49.06%. Increasing the HDR core diameter ratio produced a more flexible isolator with improved damping performance.
A Maintenance Strategy for Dosing Pumps Using Reliability-Centered Maintenance (RCM) and Spare Parts Ordering to Improve the Reliability of the Clean Water Supply System at PT. Dain Celicani Cemerlang Johannes Kevin Purba; Aulia Ishak; Nurhayati Nurhayati
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.534

Abstract

The continuity of the clean water distribution process at PT Dain Celicani Cemerlang is highly dependent on the reliability of the dosing pumps. However, the maintenance system currently in place is still reactive (corrective maintenance), resulting in high operational downtime and uncontrolled maintenance costs. This study aims to improve the reliability of the clean water supply system by designing a maintenance strategy based on Reliability-Centered Maintenance (RCM) and optimizing spare parts management through a spare parts ordering system.  The research method used is descriptive quantitative analysis, which involves analyzing reliability parameters such as Mean Time Between Failures (MTBF), Mean Time To Repair (MTTR), and Risk Priority Number (RPN) through a Failure Mode and Effect Analysis (FMEA) approach. In addition, the Economic Order Quantity (EOQ) and Period Order Quantity (POQ) methods were used to determine the most efficient spare parts ordering policy.  The research results show that the implementation of appropriate RCM strategies (such as preventive maintenance and scheduled replacement) can significantly reduce system downtime by 89.21% and increase machine availability from 96.73% to 99.65%. From a cost perspective, implementing RCM yields savings of 24.27%, while integrating the EOQ and POQ methods into spare parts management reduces inventory costs by up to 41.73% compared to the company’s current system. In conclusion, the integration of RCM with a structured spare parts ordering system is highly effective in ensuring the company’s operational stability and cost efficiency.
Development of an Integrated Quality Control Model for Outer Gear Couplings Based on Six Sigma DMAIC and J48 Decision Tree Heru Ambrose Sinaga; Aulia Ishak; Nurhayati
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.570

Abstract

Producing precision components like outer gear couplings requires high geometric and surface quality to maintain mechanical transmission performance in machinery. However, CV Adi Makmur Metalindo experiences recurring quality issues with these specific components. Between July and October 2025, the overall defect rate reached 16.94% (62 defective units out of 366 total units). These issues are primarily geometric defects (62.90%) and surface defects (37.10%). This comprehensive study evaluates production quality performance, identifies dominant process attributes triggering defects, and develops a robust decision support model for quality control. The methodology utilizes a quantitative case study approach, integrating the Six Sigma DMAIC framework with the J48 decision tree algorithm to reinforce the Analyze stage. Results indicate a Defect Per Million Opportunities (DPMO) value of 169,399 and a Defect Per Unit (DPU) of 0.1694, confirming an unstable production process with a high probability of defects. The J48 algorithm modeling clearly identified rough turning RPM (rpm_bubut_kasar) as the dominant predictor classifying product quality. Extracted decision rules reveal that setting machine RPM too low (under 53.9 RPM) or too high (over 65.5 RPM) heavily correlates with geometric defects, whereas the intermediate range triggers surface defects. Consequently, the Improve phase proposes standardizing operational parameters within an optimal range of 55 to 65 RPM. For the Control phase, a mockup of a smart monitoring dashboard interface was designed to efficiently support targeted quality control decisions. Ultimately, integrating Six Sigma DMAIC and the J48 algorithm successfully transforms manufacturing process data into practical decision rules, effectively supporting product quality optimization.
Analisis Keandalan Unit Hydraulic Power Pack Berbasis Multi-Fluid Scheduled Oil Sampling: Studi Kasus Engine Perkins 6 Silinder di Industri Migas Muhammad Mukti Ali; Ryan Effendi; Yuni Hermawan; Gaguk Jatisukamto
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.576

Abstract

This study aims to analyze the reliability of a Hydraulic Power Pack unit using the Multi-Fluid Scheduled Oil Sampling (SOS) approach by evaluating the condition of engine oil, hydraulic oil, and radiator coolant. The test object is a 6-cylinder Perkins engine with over 10,000 operational hours spanning ±11 years without any history of General Overhaul (GOH). The analysis utilizes laboratory test data from SOS Trakindo Balikpapan, covering parameters such as fuel dilution, viscosity, Total Base Number (TBN), oxidation, wear metals, Particle Quantifier Index (PQI), ISO 4406 cleanliness levels, glycol concentration, nitrite levels, pH, and coolant conductivity. The results indicate that the engine oil has undergone severe degradation, characterized by an extreme fuel dilution of 11.94%, a drastic drop in viscosity to 9.807 cSt, elevated oxidation, and internal wear metal signatures, signaling a decline in lubrication system reliability. Conversely, the hydraulic oil remains within acceptable operational limits despite early-stage particle contamination (ISO Code 20/15). The radiator coolant displays stable physical and chemical properties with 36% glycol concentration, pH 7.4, and a conductivity of 2315 µS/cm, showing no signs of oil cross-contamination. Integrated multi-fluid analysis reveals that the primary degradation mechanism is confined to the engine lubrication system, while the hydraulic and cooling systems maintain operational integrity. This study demonstrates that the Multi-Fluid SOS framework offers a more comprehensive and accurate diagnostic capability for high-operating-hour oil and gas equipment compared to traditional single-fluid monitoring.
Kajian Pemetaan Tenaga Kerja Konstruksi Berkelanjutan Level Operator di Kabupaten Tangerang Sarjono Puro; Kiki Maria; Edison H. Manurung; Charles Sitindaon
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.611

Abstract

Investment realization in Tangerang Regency increased steadily from 2020 to 2024, reaching a cumulative value of IDR 26.2 trillion in 2024. This growth was supported by major infrastructure projects in Banten Province, including the Serang-Panimbang Toll Road Sections 2A and 2B and the Serpong-Balaraja Toll Road Section 1B. These projects have expanded employment opportunities for construction workers, particularly operator-level workers. However, limited workforce competency remains a challenge to construction project performance. Previous studies indicate that competency is influenced by education, technical skills, and work experience, while many construction workers still lack formal competency certification. This study aims to map the characteristics and competency profile of operator-level construction workers in Tangerang Regency. A quantitative descriptive approach combined with cluster analysis was employed to analyze worker characteristics and competency levels. The results show that operator-level construction workers are predominantly 40 to 50 years old (70.48%), male (100%), have completed only elementary education (43%), are local residents (92%), and have more than six years of work experience (60.42%). Most have worked on residential construction projects (76%) and typically wait zero to six months for their next project (71%). Nevertheless, 84% have never attended formal training and 87% do not possess a Construction Work Competency Certificate (SKK). These findings highlight the need to expand training and certification programs to improve workforce competency and support sustainable construction development.
Evaluasi Beban Kerja Mental Operator Assembly Line OPP Window Menggunakan Metode NASA-TLX di Industri Elektronik Sarah Awallia; Muhamad Engkos Kosim; Rini Siskayanti
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.625

Abstract

Human resources play an important role in achieving organizational productivity and production targets. PT XYZ is an electronics manufacturing company producing Air Conditioners (ACs) and Dehumidifiers. In the assembly process, operators perform manual tasks assisted by a conveyor system, requiring high speed and accuracy to meet a production target of 400 units per hour. These conditions may increase operators' mental workload. This study aimed to determine the level of mental workload and identify its dominant dimensions among operators in the OPP Window Group 2 assembly line at PT XYZ. The study employed the National Aeronautics and Space Administration Task Load Index (NASA-TLX) method involving 29 operators. Data were analyzed using NASA-TLX, reliability testing, and Pareto analysis. The reliability test produced a Cronbach's Alpha value of 0.797, indicating that the instrument was reliable. The average NASA-TLX score was 80.69, indicating a very high mental workload. Seventeen operators were classified as very high, nine as high, and three as moderately high. Pareto analysis identified Own Performance, Effort, Temporal Demand, Physical Demand, and Frustration Level as the dominant dimensions, contributing 86.35% cumulatively. The findings indicate that assembly operators experience a very high mental workload, mainly influenced by performance pressure, work effort, time pressure, physical demands, and frustration.
Analisis Perbaikan Defect Slag Inclusion Menggunakan SPC dan FMEA pada Jacket Structure di PT. McDermott Novia Nur Rhamadhan; Hery Irwan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.626

Abstract

Welding operations in jacket structure fabrication require strict quality control because defects may reduce joint integrity and increase rework. This study aims to analyze slag inclusion defects, evaluate process stability, identify root causes, and determine improvement priorities in the flux-cored arc welding process at PT McDermott. A quantitative approach was applied using Statistical Process Control (SPC), cause-and-effect diagram, and Failure Mode and Effects Analysis (FMEA). Data were collected from Ultrasonic Testing (UT) and Magnetic Particle Inspection (MPI) covering 340 welded joints from October 2025 to April 2026. The results show that 23 joints were defective, with 12 cases (52.17%) identified as slag inclusion. Verification confirms that all welding parameters comply with the Welding Procedure Specification (WPS). The p-chart analysis resulted in an average defect proportion of 0.0353. One subgroup on February 25, 2026 recorded a proportion of 0.1600, exceeding the upper control limit of 0.1460, indicating that the process is not fully statistically controlled. FMEA identified inadequate interpass slag cleaning as the highest-risk cause with an RPN of 224. After improvements, the total RPN decreased from 1,288 to 301, representing a 76.63% reduction. These findings indicate that the integration of SPC and FMEA effectively identifies process variation and reduces operational risk.
Comparative Life Cycle Assessment of Carbon Emissions and Circular Economy in Conventional and Geopolymer Precast Concrete Muhammad Fatoni Uhrowi; Jauhar Fajrin; I Ketut Budastra; Martin Anda
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.629

Abstract

The construction sector accounts for approximately 37% of global carbon emissions, largely due to Portland cement production. Accelerated infrastructure development on Lombok Island has surged precast concrete demand, increasing the regional carbon footprint. This study compares the environmental impacts of conventional precast concrete against fly ash-based geopolymer concrete using Life Cycle Assessment (LCA) integrated with circular economy analysis. A cradle-to-gate boundary (Modules A1-A3) with a 1 m³ functional unit of K-350 concrete was modeled in OpenLCA using the CML-IA method. Primary data came from a West Lombok precast producer; the geopolymer mix was literature-based. Results indicate the conventional precast footprint is 381.71 kg CO₂-eq/m³, dominated by cement (90.40%). Substituting 90% cement with Jeranjang power plant fly ash reduced emissions by 49.15% to 194.10 kg CO₂-eq/m³, despite burden shifting to alkali activators (66.86% contribution). Binder circularity achieved 90%, with a fly ash supply-to-demand ratio of ~530%. A 2025–2029 projection shows potential avoidance of 20,027 tons CO₂-eq and absorption of 27,179 tons of fly ash. Sensitivity analysis confirms model robustness (±0.14%). Transitioning to geopolymer concrete is a highly recommended decarbonization strategy for West Nusa Tenggara.

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