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All Journal Horizon: Indonesian Journal of Multidisciplinary Trends in Mechanical Engineering Research
Tb. Ade Rahmatullah
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The Effect of Voltage Quality Variations on The Performance and Operational Lifespan of Electronic Equipment in the Electrical System of Educational Buildings Salsanabila Mariestiara Putri; Asro; Tb. Ade Rahmatullah; Mujiburohman; Amir Akbar Wicaksono
HORIZON: Indonesian Journal of Multidisciplinary Vol. 4 No. 3 (2026): HORIZON: Indonesian Journal of Multidisciplinary (In-Press)
Publisher : Lembaga Intelektual Muda (LIM) Maluku

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54373/hijm.v4i3.5504

Abstract

This study aims to analyze the effect of voltage quality variations on the performance and estimated operational lifespan of electronic equipment. The study uses a quantitative explanatory approach with a field measurement design (in-situ) through the use of a power quality analyzer and supporting instruments. Data were analyzed using descriptive statistics, correlation analysis, and multiple linear regression. The results show that voltage quality variations occur unevenly, with the highest level of disturbances in areas with high electronic load density. Total harmonic distortion (THDv), voltage sag, and voltage unbalance are the most dominant factors influencing performance degradation and accelerating equipment operational degradation. The regression model shows a significant effect with strong explanatory power. This study confirms that voltage quality variations directly impact short-term performance and contribute to equipment operational lifespan reduction through the accumulation of electrical and thermal stress, making power quality management a crucial aspect in improving system reliability and efficiency of educational building facility management
BEARING FAILURE ANALYSIS ON VIBRATING SCREEN EXCITER BASED ON EXPLICIT LUBRICATION PARAMETER CALCULATION AND MODIFIED BEARING LIFE: AN INDUSTRIAL CASE STUDY Sayid Bahri Sriwijaya; Mohamad Haifan; Tb. Ade Rahmatullah
Trends in Mechanical Engineering Research Vol 4, No 1 (2026): JUNE
Publisher : Department of Mechanical Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/timer.v4i1.41310

Abstract

This study investigates repeated failures of a spherical roller bearing type 22330 (MTBF = 23 months) on a vibrating screen exciter at a sinter plant through tribological root cause analysis, explicit EHL film-thickness calculation, and ISO 281:2007 life estimation. Why-Why Analysis identified inadequate lubricant viscosity as the principal failure driver. An explicit Dowson–Higginson line-contact EHL calculation, cross-validated against the SKF diagram method (deviation 6–10%), showed that ISO VG 100 yields κ = 3.08 and λ = 1.7–1.9 (mixed-lubrication regime), while ISO VG 220 raises these to κ = 6.13 and λ = 2.5–3.2 (full-film EHL regime). Sensitivity analysis confirms the VG 220 classification is robust across composite roughness σ* = 0.40–0.65 μm. The gap between the actual MTBF (23 months) and the nominal L₁₀a under VG 100 (≈74 months, with equivalent load P = Fr + Y₁·Fa per the spherical-roller-bearing catalogue provisions) suggests additional limiting factors, likely particle contamination or intermittent shock loading, which warrant further investigation. Per ISO 281:2007, upgrading to VG 220 is estimated to increase L₁₀a from ≈59–89 to ≈158–237 months, with a benefit-to-cost ratio exceeding 15:1. Findings support lubricant viscosity optimization as a low-cost reliability intervention; generalization to other installations requires independent validation.
Co-Authors Amir Akbar Wicaksono Asro Asro mohamad haifan Mujiburohman Salsanabila Mariestiara Putri Sayid Bahri Sriwijaya