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Sainstech Nusantara
Published by Nusantara Publisher
ISSN : 30630657     EISSN : -     DOI : https://doi.org/10.71225/jstn.v1i4
Core Subject : Science, Engineering,
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering
The journal publishes original papers that cover, but are not limited to, the following topics: Mechanical Engineering Chemical Engineering Electrical Engineering Civil Engineering Chemistry Energy Transportation Computer Science Physic Material Science
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 45 Documents
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Comparative Evaluation of LQR and LQT for VD-49.15-K1-B00 Brushless DC Servomotor Tracking Under Noise Anisa Fitri Santosa; Anggara Trisna Nugraha; Rama Arya Sobhita; Dimas Eka Saputra
SAINSTECH NUSANTARA Vol. 3 No. 1 (2026): February 2026
Publisher : Nusantara Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71225/jstn.v3i1.102

Abstract

Compact brushless direct-current servomotors require controllers that combine rapid reference tracking, low transient error, and tolerance to measurement disturbance. This study presents a harmonized simulation-based comparison of linear quadratic regulator (LQR) and linear quadratic tracking (LQT) control for the VD-49.15-K1-B00 three-phase external-rotor servomotor. Manufacturer specifications were revalidated, the plant was represented in state-space form, and both optimal-control structures were assessed in MATLAB/Simulink under nominal and additive-noise conditions. Performance was quantified using 10–90% rise time, 2% settling time, percentage overshoot, and normalized root-mean-square error (RMSE) over a common evaluation interval. Without noise, LQT reduced rise time from 0.45 to 0.30 s, settling time from 0.80 to 0.65 s, and RMSE from 2.5% to 2.0%, while overshoot increased from 1.0% to 3.0%. With noise, RMSE increased to 4.5% for LQR and 4.0% for LQT. The results therefore indicate a practical speed–overshoot trade-off: LQT provides faster and more accurate tracking in the evaluated conditions, whereas LQR limits the nominal peak excursion.
Effect of Suction-Hose Diameter on an Electric-Powered Motorcycle Engine-Oil Extraction Device Faisal Hibatullah; Edi Widodo; Prantasi Harmi
SAINSTECH NUSANTARA Vol. 3 No. 1 (2026): February 2026
Publisher : Nusantara Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71225/jstn.v3i1.124

Abstract

Electric-powered oil extraction through a motorcycle engine’s service opening can simplify routine maintenance, but performance depends on viscous-fluid behavior, suction-line geometry, and the pump operating point. This study compared nominal nylon hose diameters of 6, 8, and 10 mm at a common length of 1.8 m and a fixed extracted oil volume of 780 mL. Extraction time and current were recorded at 220 V, while flow rate, cycle energy, hydraulic power, and a system-level hydraulic-to-electrical power ratio were recalculated for consistency. The 8 mm hose produced the shortest extraction time (44 s), highest flow rate (1.773 × 10⁻⁵ m³/s), and lowest corrected cycle energy (3.227 Wh). With the recorded 0.666 m total head, hydraulic power was 0.1066 W and the apparent hydraulic-to-electrical ratio was 0.0404%. Relative to the 6 and 10 mm hoses, the 8 mm configuration reduced extraction time by 30.2% and 33.3% and energy use by 34.5% and 28.6%, respectively. The reported oil-recovery ratio was 97.5%. The 8 mm hose therefore provided the best observed performance for this prototype, although confirmation requires replicate-level statistics, controlled oil temperature and viscosity, direct differential-pressure measurement, and true electrical-power measurement.
Techno-Economic and Reliability Assessment of Generator Set as Backup Electrical Power for Critical Airport Infrastructure: A Case Study of Juanda International Airport Fernanda Manuela Rodrigues Santos Viegas Vicente; Gunawan Sakti
SAINSTECH NUSANTARA Vol. 3 No. 1 (2026): February 2026
Publisher : Nusantara Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71225/jstn.v3i1.151

Abstract

Continuity of electrical supply is essential to airport safety and operational resilience. This structured evidence review develops an integrated framework for assessing backup generator sets, with implications for Juanda International Airport. The synthesis draws on a core set of 15 publications comprising six direct airport studies and nine transferable studies on generator reliability, emergency power, microgrids, storage, forecasting, and outage mitigation. Evidence is organized into technical feasibility, lifecycle economics, and reliability and resilience. The principal assessment variables are capacity adequacy, start and transfer performance, voltage and frequency quality, fuel endurance, maintenance readiness, lifecycle cost, availability, redundancy, and recovery capability. Airport studies support integrated microgrid and energy-management approaches, while transferable studies inform standby-generator reliability and emergency-power continuity. The framework evaluates generator sets within a critical-load supply architecture and identifies the load, outage, testing, fuel, maintenance, and cost data needed for a Juanda-specific assessment. The search documentation reports 348 Scopus records, but incomplete screening records prevent reconciliation of a final PRISMA inclusion count. The findings therefore support framework development rather than a quantitative assessment of the existing airport system.
Railway System Challenges and Integrated Strategies for Improving Reliability and Operational Resilience Aditya Wahyu Erlangga; Ariq Naufal Rabbani; Wahyu Tamtomo Adi; Ayu Prativi
SAINSTECH NUSANTARA Vol. 3 No. 1 (2026): February 2026
Publisher : Nusantara Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71225/jstn.v3i1.153

Abstract

This study provides a comprehensive description of the problems affecting railway systems, including infrastructure failure, operational disruption and capacity constraints, ageing infrastructure and maintenance deficiencies, system integration challenges, governance and management issues, also funding and financial sustainability challenges. The findings were obtained through a systematic review of reputable national and international articles focusing on railway system problems, followed by full-text screening and classification of the selected articles. The review shows railway system problems are multidimensional and interrelated, comprising physical infrastructure failure, operational disruption caused by capacity limitations and accumulation of delays, component wear resulting from dynamic usage, weaknesses in governance and management, and vulnerability to external disturbances, all of which require an integrated approach to improve railway system reliability.
Slab Track Systems: A Review of Design Approaches, Structural Parameters, and Performance Aditya Wahyu Erlangga; Ariq Naufal Rabbani; Wahyu Tamtomo Adi; Ayu Prativi
SAINSTECH NUSANTARA Vol. 3 No. 1 (2026): February 2026
Publisher : Nusantara Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71225/jstn.v3i1.154

Abstract

This study describes the structure of non-ballasted track, focusing on design approaches for non-ballasted track, the structural parameters of non-ballasted track, and the advantages and disadvantages of ballasted and non-ballasted track. A systematic review was conducted by searching reputable national and international articles on non-ballasted track structures in leading databases using the article keywords, followed by full-text screening and classification of the selected articles. The components of non-ballasted track comprise the rail, fasteners, rail support platform, prefabricated concrete slab, cement asphalt mortar layer, and concrete base. Ballasted and non-ballasted track systems have distinct technical, economic, and environmental advantages and disadvantages, and the choice between them depends on line speed, construction cost, maintenance requirements, and the targeted service life.

Page 5 of 5 | Total Record : 45

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