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All Journal Majalah Ilmiah Pengkajian Industri Jurnal Polimesin
Purnama, Harry
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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KARAKTERISTIK DINAMIK ROTOR BOW THRUSTER 250 KW MENGGUNAKAN PEMODELAN EULER-BERNOULLI BEAM Purnama, Harry; Fadjrin, Budi Noviantoro; Adynugraha, Muhammad Ilham; Ali Nandar, Cuk Supriyadi
Majalah Ilmiah Pengkajian Industri Vol. 13 No. 1 (2019): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v13i1.3128

Abstract

Abstrak Perkembangan mesin-mesin elektrik terutama Bow Thruster bagi sektor kemaritiman sangat signifikan. Dari beberapa komponen penting dalam Bow Thruster, rotor terutama poros dan bantalan bearing mempunyai peran penting sehingga  perlu dilakukan analisa. Analisa dinamik merupakan analisa untuk mengetahui sifat-sifat dinamik rotor akibat pengaruh putaran terhadap frekuensi pribadi. Pada makalah ini analisa dinamik dikembangkan dengan pemodelan rotor menggunakan Euler-Bernoulli Beam (EBB). Hasil dari analisa dinamik rotor ini menunjukan putaran kritis dan modus getar dari rotor Bow Thruster. Kata kunci : Rotordinamik, Euler-Bernoilli Beam, Poros, Putaran Kritis, Modus Getar. AbstractThe development of electric machines, especially Bow Thruster, for the maritime sector is significantly increased. The several important components in Bow Thruster, rotors, especially shaft and bearings, have an important role to analyzed. Dynamic analysis is an analysis to determine the dynamic properties of rotors due to the effect of rotation on natural frequency. In this paper a dynamic analysis, rotor modeling was developed using Euler-Bernoulli Beam (EBB). The results of this rotor dynamic analysis show the critical speed and mode shapes of the Bow Thruster rotor. Key Words : Rotor Dynamic, Euler-Bernoulli Beam, Shaft, Critical Speed, Mode Shape.
ANALISIS TRANSIEN UNTUK MEMPREDIKSI KEDALAMAN PENGERASAN PERMUKAAN PADA BAGIAN KRITIS CRANKSHAFT Purnama, Harry
Majalah Ilmiah Pengkajian Industri Vol 10, No 2 (2016): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (349.77 KB) | DOI: 10.29122/mipi.v10i2.140

Abstract

Dalam penelitian ini simulasi dinamis transien diterapkan pada crankshaft dengan silinder ganda empat stroke. Analisis elemen hingga dilakukan dengan menggunakan software bantu ANSYS untuk memperoleh tegangan von-misses di lokasi kritis, sedangkan permodelan 3D menggunakan software 3D modeling CATIA. Beban dan kondisi batas yang diterapkan sesuai dengan kondisi engine mounting di ANSYS. Simulasi transien di mana pembebanan didasarkan pada waktu diharapkan dapat memperoleh kedalaman dari konsentrasi tegangan. Hal ini dapat membantu untuk proses m dari crankshaft, pengerasan permukaan. * In this study a transient dynamic simulation was conducted on a crankshaft for double cylinder four stroke engine. Finite element analysis was performed to obtain of von-misses stress at critical locations using ANSYS, while the model creation can be created by well known 3D modeling software CATIA. The load and boundary conditions were applied according to the engine mounting conditions in ANSYS. The simulation with the proper time step be expected depth of stress concentration. It can help to the next process of crankshaft, surface hardening. Kata kunci : Analisa Transient, Time Step, ANSYS, Crankshft, Pengerasan Permukaan.
ANALYSIS OF SPOT-WELDING PITCH ON TOP HAT STRUCTURE AGAINST CRASHWORTHINESS CRITERIA Purnama, Harry; Istiyanto, Jos
Majalah Ilmiah Pengkajian Industri Vol. 15 No. 1 (2021): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The application of spot-welding in the automotive industry, especially the electric-based vehicle frame structure, has been optimized to meet passenger and battery compartment safety factors. The present numerical study of the electric-based vehicle frame structure with the top hat cross-sectional model validated the experimental results of reference, which then modified the spot-welding pitch to determine the crashworthiness effect and criteria. The numerical simulation results show that reducing spot-welding pitch in vertical direction can increase energy absorption (EA) by 1.70% - 9.91%, while bringing spot-welding pitch closer to the flange's outer edge can reduce its maximum force (Fmax) by 8.11% - 21.67%. Keywords: Spot-welding; Top Hat Structure; Crashworthiness; Numerical Simulation; Electric Vehicle.
Calculation Of Minimum Shaft Bearing Diameter Of ORC Turbine-Generator 100 kW And Analysis Using Finite Element Method Hermawan, Hana; Guardi, Arli; Purnama, Harry; Sakban, Sakban
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4262

Abstract

This study aims to analyze the strength of a turbine-generator shaft and determine the minimum diameter of the shaft using the Finite Element Method (FEM). The research problem is to ensure the shaft's strength and durability, considering the high rotation speed of the hermetic turbine generator. The methodology involves using Finite Element Method and comparing the calculated minimum diameter with the physical properties of stainless steel 420. The research design includes modeling the shaft using SolidWorks and conducting FEM analysis using Ansys Mechanical Structure. The results show that the maximum von Mises stress is 50.6 MPa, which is below the material's yield strength of 345 MPa. The deformation of the shaft is minimal, and the natural frequencies indicate no critical speed below the rated RPM of the turbine-generator. The implications of this study are that the analyzed shaft design is safe and meets the strength requirements for the turbine-generator.
An investigation into the crashworthiness criteria of a top-hat structure with a dent-type crush initiator through numerical analysis Purnama, Harry
Jurnal Polimesin Vol 21, No 5 (2023): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i5.4126

Abstract

Ensuring the safety of passengers and the battery compartment in electric vehicles during frontal collisions is of utmost importance. This research aims to enhance the design of the top-hat structure used in car front rails by incorporating a crush initiator as the weakest section. The addition of a crush initiator optimizes the crashworthiness criteria by reducing peak force and increasing energy absorption. Numerical simulations were conducted using ABAQUS to validate the findings and compared against experimental results from references. The results demonstrate that the development of a top-hat structure with a dent-type crush initiator led to 27.5% decrease in peak force and 18.75% increase in energy absorption. The improvements in peak force and energy absorption could reduce the impact force and allow the crumple zone to completely absorb the kinetic energy during a collision, positively affecting the safety of passengers and battery compartments in electric vehicles
Co-Authors Adynugraha, Muhammad Ilham Cuk Supriyadi Ali Nandar Fadjrin, Budi Noviantoro Guardi, Arli Hermawan, Hana Jos Istiyanto sakban, sakban