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Graciadiana. I. Huka
Jurusan Mesin, Politeknik Negeri Ambon
Industrial & Manufacturing Engineering Mechanical Engineering

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Analisis Kuantitatif Pengaruh Getaran Mesin Terhadap Umur Fatik Struktur Rangka Dump Truck Kapasitas Besar Pada Kondisi Pembebanan Dinamis Frederik Demmatacco; Nevada Nanulaitta; Graciadiana I Huka
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.v4i1.4019

Abstract

Large-capacity dump truck operations in mining environments generate cyclic dynamic loads originating from engine vibration, uneven haul road surfaces, and inertial forces from acceleration and braking, which potentially trigger fatigue damage accumulation in the vehicle chassis frame structure. This study aims to characterize the engine vibration spectral profile, map the dynamic stress distribution at critical frame zones, and quantitatively assess the contribution of engine vibration to fatigue life prediction in an integrated manner. The methodology integrates three primary approaches, namely in-situ vibration measurement based on Power Spectral Density analysis, frequency-domain Finite Element Analysis simulation, and fatigue life prediction utilizing rainflow counting combined with Miner's Rule. Measurement results reveal a peak Power Spectral Density value of 0.0842 g²/Hz under full-load conditions at 2,100 RPM. Numerical simulation confirms a maximum von Mises stress of 487 MPa at the front cross member welded joint, exceeding the material fatigue limit of 310 MPa. Fatigue life prediction at the most critical point reaches approximately 11,494 operational hours, with engine vibration contributing 38.6% of the total accumulated damage. These findings establish engine vibration as the second largest determinant of chassis structural degradation, making engine mounting system optimization and remaining fatigue life-based predictive maintenance the primary recommendations of this research. Keywords: engine vibration; fatigue life; finite element analysis; Miner's Rule; mining dump truck
Pengaruh Variasi Ketinggian Elektrikal Stik Out Pengelasan Gas Metal Arc Welding (GMAW) Terhadap Sifat Mekanis Pada Pipa Seamless Imam A Hanifah; Nevada. J. M. Nanulaitta; Graciadiana. I. Huka
Journal Mechanical Engineering Vol. 1 No. 2 (2023): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i2.1990

Abstract

Welding is a process of joining two or more metal materials together through a local melting process. There are many types of welding, one of which is Gas Metal Arc Welding (GMAW). In gas metal arc welding (GMAW), one of the factors that affect the result of welding is the height of the stick out. The purpose of this study was to determine the effect of changing the height of the stick out in the gas metal arc welding (GMAW) welding process on the pipe on the mechanical strength of the pipe. The method used in this study is a quantitative method with data collection techniques through the library, and the main data sources obtained directly from the research process, and related interviews regarding the tools and materials used at the Ambon State Polytechnic Mechanical Engineering Laboratory. The results of the research that the author did show that the greatest Impact Strength with a value of 0.1136 KJ/mm2 is at a height of 7 mm electrical stick out and 0.0960 KJ/mm2 is at a height of 9 mm electrical stick out, this can be seen in the figure 4.1 and 4.2 where the graph will have a decreasing trend with increasing variations in the height of the electrical stick out in GMAW welding, while for the bending test the shorter the electrical stick out will result in increased welding penetration, so that the melting of the weld material in the welding process is getting deeper and the cooling process is getting deeper time results in increased ductility of the seamless pipe, it also depends on the thickness of the material being welded, the gas flow rate and metal transfer in the weld. Keywords : GMAW Welding, Stick Out, Mechanical Properties, Seamless Pipe, Impact Test, Bending Test
ANALISIS TINGKAT GETARAN PADA KOMPRESOR SPERRE X RANGE AIR (BLA 901) DI PLN PLTMG 30 MW AMBON PEAKER BERDASARKAN ISO 20816 8 Rivaldy Yampapy; Roy R Lekatompessy; Graciadiana I Huka
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.v4i2.4099

Abstract

This study analyzes the vibration level of the SPERRE X-Range Air Compressor Unit BLA 901 at the PLN PLTMG 30 MW Ambon Peaker using the overall vibration velocity RMS parameter. Measurements were conducted over a 10-day period, from June 23 to July 2, 2026, at five measurement points and in three directions: horizontal, vertical, and axial, resulting in a total of 150 measurement data points. The data were analyzed using descriptive statistics, linear regression, trend analysis, and projection up to the 15th day. The measurement results showed that the highest average vibration level occurred at the T3-NDE point in the vertical direction, with a value of 6.144 mm/s, while the highest maximum value was 6.430 mm/s. All measurement point and direction combinations exhibited an increasing tendency based on the linear regression slopes. The highest slope, 0.0517 mm/s/day, was obtained at T3-NDE in the horizontal direction, with a coefficient of determination (R²) of 0.7846. The highest projected vibration level on the 15th day was 6.597 mm/s at T3-NDE in the vertical direction. Based on the evaluation guideline values for the frame (top) measurement location specified in ISO 20816-8:2018, seven measurement point and direction combinations were classified as Zone A and eight as Zone B, while none were classified as Zone C or Zone D. The results provide an initial quantitative baseline of the vibration level of Compressor BLA 901 and indicate that T3-NDE, particularly in the vertical direction, requires greater attention during subsequent vibration monitoring. The regression and projection results are used as indicators of short-term mathematical trends and are not intended to predict failure time or compressor service life. Keywords: reciprocating compressor; overall vibration velocity RMS; vibration analysis; ISO 20816-8:2018; linear regression..
THE EFFECT OF VARIATION PERCENTAGE ALKALIZATION (NAOH) ON THE MECHANICAL PROPERTIES ANALYSIS AND WATER ABSORPTION BEHAVIOUR IN BIOCOMPOSITE WITH CASSAVA RUBBER STARCH Semuel M.J.S Tuny; Nevada J.M Nanulaitta; Graciadiana I Huka
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.v4i2.4101

Abstract

Maluku as one of the provinces in Indonesia has a lot of potential sago plants, which is the basis for conducting research using sago fiber and rubber cassava starch as a base material for making composites that have good mechanical value and are environmentally friendly. Composites are made using natural ingredients namely sago fiber and cassava rubber starch as the matrix. The making of composites is expected to get good bending strength, impact strength, and water absorption rate. Composites are made using the hand lay-up method with a variation of the matrix. The variation of the volume fraction of sago pith fibers is 1:1 and 7:3 using NaOH liquid and distilled water in the alkali process with a percentage ratio of 0%, 5%, 10%, 15%, and 20% soaking time in NaOH liquid for 120 minutes. The results of this study were found to be the best impact value on composites with 1:1 fiber volume variation with 15% alkaline NaOH liquid process. The highest value of the energy absorbed by the composite was 7.5479 J with an impact strength of 0.0755 J·mm-2. At a variation of 7:3 the highest absorption energy is 5.7430 J, while the impact strength is 0.0574 J·mm-2 at 15% of NaOH liquid percentage. The highest bending strength is 226.035 MPa at 1:1 volume fraction variation with 15% NaOH liquid percentage. In 7:3 fiber volume fraction variation, the highest value reaches 206.199 MPa at 15% NaOH liquid percentage. The best water absorption rate is at 8.82% that occurs in 1:1 fiber volume fraction variation, with 15% percentage of the NaOH alkaline process. In the other side, water absorption rate is 9.16% in the 7:3 fiber volume fraction variation with 15% NaOH liquid in the alkalization process. Keynote : sago pith fiber, cassava rubber starch, NaOH, hand lay up method, bending strength, impact strength and water absorption rate
PENINGKATAN KETAHANAN AUS PERMUKAAN BAJA KONSTRUKSI ST-42 MELALUI SUBSTITUSI ENERGIZER CANGKANG KEPITING (CACO3) PADA PROSES PACK CARBURIZING DAN PENEMPERAN Roy R. Lekatompessy; Erwin B Pattikayhatu; Nevada J.M Nanulaitta; Graciadiana I Huka
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.v4i2.4103

Abstract

Low-carbon steel ST-42 is a material widely applied in general mechanical construction, yet it exhibits technical limitations regarding its surface hardness. This study aims to investigate the effect of varying tempering temperatures (200°C, 300°C, 400°C, 500°C, and 600°C) on the hardness value of St-42 steel following a surface hardening process using the pack carburizing method. As an eco-friendly biomaterial innovation, this research substitutes the use of synthetic Barium Carbonate (BaCO3) with crab shell waste which is rich in Calcium Carbonate (CaCO3) acting as a catalyst (energizer), combined with walnut shell carbon powder. A quantitative laboratory experiment was conducted utilizing 15 plate test specimens, where mechanical properties were measured using the Rockwell method (HRC).  The results demonstrated that crab shells operate highly effectively in accelerating carbon diffusion; the average initial hardness of the steel increased drastically from 112.6 HRC to approximately 138.5 HRC post-carburizing and rapid quenching using SAE 20-50 oil. The tempering stage revealed an inversely proportional empirical correlation between temperature and material hardness. Low-temperature tempering (200°C–300°C) successfully maintained hardness retention at around 135 HRC through epsilon carbide precipitation, whereas high-temperature tempering (500°C–600°C) drastically reduced hardness to 125.325 HRC due to cementite spheroidization and carbide agglomeration. In conclusion, crab shell waste serves as a highly reliable alternative energizer, and tempering temperature parameters can be precisely engineered to achieve an optimal equilibrium between surface wear resistance and material toughness for industrial machinery components. Keywords: ST-42 Steel, Pack Carburizing, Crab Shell, Tempering, Rockwell Hardness.
Co-Authors Annafiyah Annafiyah Auliana Diah Wilujeng Berthy Pelasula Berthy Pelasula Cindy Gabriel Maitimu Denny Ismail Pellu Erwin B Pattikayhatu F Demmatacco Frederik Demmatacco H. S. Latumaerissa Hendry de Fretes Ida Ayu Putu Sri Widnyani Imam A Hanifah Josef Matheus Josef Matheus Josef Matheus Jovancko. S. S. Picanussa Julian Salakory Kayadoe, Yuliens Anggin Lasamahu, Stevanno B D Lekatompessy, Roy R Leslie S. Loppies Loppies, Leslie S Maitimu, Cindy Gabriel Nevada J. M. Nanulaitta Nevada J.M Nanulaitta Nevada JM. Nanulaitta Nevada. J. M. Nanulaitta Nevada. J. M. Nanulaitta Nevada. JM Nanulaitta Pattikayhatu, Erwin Bravor Pellu, Denny Ismail Picanussa, Jovancko. S. S. R.R Lekatompessy R.R. Lekatompessy Ratna Ayu Pawestri Kusuma Dewi Rivaldy Yampapy Roy R Lekatompessy Roy R Lekatompessy Roy R. Lekatompessy Sanny Hahury Sanny Hahury, Sanny Semuel M.J.S Tuny Stevanno B D Lasamahu Yuliens Anggin Kayadoe