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Victor D Waas
Jurusan Teknik Mesin Politeknik Negeri Ambon
Industrial & Manufacturing Engineering Mechanical Engineering

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STUDI EKSPERIMENTAL KEAUSAN SABUK-V STANDAR DAN NON-STANDAR PADA SISTEM TRANSMISI CVT SEPEDA MOTOR MATIC Semuel M Taribuka; Kristofol Waas; Victor D Waas
Journal Mechanical Engineering Vol. 3 No. 1 (2025): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i1.3424

Abstract

Automatic motorcycles are a type of motorcycle equipped with an automatic transmission system that does not require a manual gear lever for shifting. The gear ratio changes automatically according to the engine speed, allowing the rider to control acceleration solely by adjusting the throttle. The use of an automatic transmission, or Continuous Variable Transmission (CVT), in this system relies on a standard V-belt, as it significantly affects engine performance. However, some motorcycle owners use non-standard belts because they are cheaper, which often leads to faster wear. This study was conducted to determine the wear rate experienced by both standard and non-standard belts after a certain period of use under specific operating conditions. The method used to evaluate belt wear rated an experimental approach, in which the motorcycle was operated at an average speed of 40 km/h over a distance of 24 km for three hours per day, over a period of three months (12 weeks). Each week consisted of 5 days of testing, with the first 6 weeks allocated for the standard belt and the following 6 weeks for the non-standard belt. After the testing period, the belts were removed and their wear was measured. The measurements were compared to the initial data to determine the amount of wear that had occurred. The results showed that the standard belt, after 6 weeks of use (90 hours), experienced wear of: 0.10 mm in diameter, 0.72 mm in upper width, and 0.25 mm in lower width. Meanwhile, the non-standard belt exhibited wear of 0.31 mm in diameter, 0.92 mm in upper width, and 0.78 mm in lower width. Based on these findings, using a standard belt is preferable, as it does not wear as quickly as a non-standard belt. Keywords: automatic motorcycle, V-belt, wear rated.
Studi Eksperimental Pengaruh Jumlah Katup Buang Terhadap Kinerja Pompa Hidram Djaman; Berthy Pelasula; Victor D Waas; Ari Permana L
Journal Mechanical Engineering Vol. 4 No. 1 (2026): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v4i1.4030

Abstract

A hydraulic ram pump is a water pumping device that utilizes the potential energy of flowing water through the water hammer phenomenon without requiring external energy sources such as electricity or fuel. This technology has considerable potential as a sustainable and cost-effective solution for water supply in rural and remote areas with limited access to electrical power. The performance of a hydraulic ram pump is influenced by several design and operating parameters, one of which is the configuration of the waste valve. However, studies investigating the effect of the number of waste valves on hydraulic ram pump performance remain limited. Therefore, this study aimed to investigate the effect of varying the number of waste valves on the water discharge and efficiency of a hydraulic ram pump. An experimental method was employed using three waste valve configurations, namely one, two, and three waste valves. The observed parameters included waste valve discharge, delivery discharge, total inlet discharge, and pump efficiency, which was calculated using the D'Aubuisson efficiency method. The results indicated that increasing the number of waste valves enhanced the hydraulic ram pump discharge. The average waste valve discharge increased from 17.75 L/s to 29.43 L/s and 46.27 L/s, while the average delivery discharge increased from 1.05 L/s to 2.10 L/s and 3.10 L/s. Similarly, the total inlet discharge increased from 18.80 L/s to 31.53 L/s and 49.37 L/s. The calculated efficiencies were 69.81% for the single waste valve configuration, 83.26% for the two-waste-valve configuration, and 78.49% for the three-waste-valve configuration. The decrease in efficiency observed with three waste valves indicates that increasing the number of waste valves does not necessarily improve pump performance due to higher energy losses during the water hammer generation process. Therefore, under the experimental conditions of this study, the two-waste-valve configuration provided the optimum performance by achieving the highest efficiency while maintaining a relatively high delivery discharge. Keywords: hydraulic ram pump, waste valve, number of waste valves, water discharge, D'Aubuisson efficiency, water hammer.
EVALUASI EFEKTIVITAS LUBRICATION OIL SEPARATOR MITSUBISHI SJ60H MENGGUNAKAN PENDEKATAN TOTAL PRODUCTIVE MAINTENANCE DAN OVERALL EQUIPMENT EFFECTIVENESS PADA PLTMG SERAM PEAKER Josef Matheus; Nanse H Pattiasina; Victor D Waas; Bella V. Lekatompessy
Journal Mechanical Engineering Vol. 4 No. 2 (2026): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v4i2.4104

Abstract

The reliability of the lubrication system in a Gas Engine Power Plant (GEPP) is influenced by the performance of the lubrication oil separator as a supporting component that maintains lubricant quality. A decline in separator effectiveness can increase failures, downtime, and reduce the overall reliability of the power generation system. This study aims to evaluate the performance of the Mitsubishi SJ60H lubrication oil separator at the Seram Peaker GEPP using the Total Productive Maintenance (TPM) approach through Overall Equipment Effectiveness (OEE) measurement, Six Big Losses analysis, and Pareto diagram analysis. This research employed a descriptive quantitative case study method based on operational and maintenance data collected from December 2023 to July 2024. Equipment effectiveness evaluation was conducted using three OEE parameters: availability, performance rate, and quality rate. The dominant loss factors were identified through Six Big Losses analysis, while Pareto analysis was applied to determine the main causes of performance degradation and to formulate TPM-based improvement strategies. This study contributes to the implementation of TPM evaluation for auxiliary equipment in power generation systems, which remains less explored compared to primary industrial machinery. The results indicate that the average OEE value of the lubrication oil separator was 71.1%, with an availability value of 90.36%, performance rate of 85.6%, and quality rate of 92%. These values are below the world-class OEE benchmark of 85%, indicating that the separator effectiveness has not yet reached an optimal level. The dominant loss factor was identified as reduced speed losses, accounting for 13.14% of total operating time and contributing 40.84% of the total losses, followed by equipment failure losses and defect losses.  Keywords: Total Productive Maintenance, Overall Equipment Effectiveness, Lubrication Oil Separator, Six Big Losses.
Co-Authors Ari Permana L Bella V. Lekatompessy Berthy Pelasula Djaman . Josef Matheus Kristofol Waas Nanse H Pattiasina Semuel M Taribuka