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Abdul Ghofur
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Program Studi Teknik Mesin, Fakultas Teknik, Universitas Lambung Mangkurat Jalan Jenderal Achmad Yani KM 35,5 Banjarbaru, Kalimantan Selatan - 70714
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Scientific Journal of Mechanical Engineering Kinematika
Published by Universitas Lambung Mangkurat
ISSN : 26559048     EISSN : 2655903X     DOI : http://dx.doi.org/10.20527
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Scientific Journal of Mechanical Engineering Kinematika (SJME Kinematika) is a mechanical engineering journal that focuses on Energy, Applied Mechanics, Materials, Manufacturing Processes. SJME Kinematics journal publish in Indonesian and receive in English. Scientific Journal of Mechanical Engineering Kinematika (SJME Kinematika) is an Open Access Journal that is available for free on online media. We are not only accept journals that focus on the derivatives of the four fields below, but also the possibility of an integrated focus of fields from several fields.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 166 Documents
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ANALISIS ELEMEN HINGGA BERBASIS ANSYS PADA SAMBUNGAN BAUT STRUKTUR COOLING TOWER Rachmat Subagyo; Riyki Apriandi; Rakyan Permadi; Yanuar Iswahyudi; Renal Fajri
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.763

Abstract

The cooling tower is a crucial component in industrial cooling systems, serving to dissipate heat from the working fluid. One of the main structural elements in a cooling tower is the bolt, which connects various components and plays a role in bearing mechanical loads. This study aims to perform numerical modeling and simulation of bolts within the cooling tower structure to understand the stress and deformation distribution under operational loads. The simulation was conducted using the finite element method based on ANSYS software, applying a pretension force of 200 Nm and a thermal load of 40 °C. The results show a maximum stress of 0.327 MPa at the contact area between the bolt head and the connecting plate, with a total deformation of 5.08×10⁻⁵ mm. The observed stress concentration indicates a potential risk of fatigue failure at the joint. This study provides valuable insights into the optimization of bolt design and material selection to enhance the cooling tower's resistance to operational loads.
PENGARUH KOMPOSISI LIMBAH SABUT KELAPA DAN KOTORAN SAPI TERHADAP KARAKTERISTIK BRIKET SEBAGAI BAHAN BAKAR ALTERNATIF Muhammad Fithroni Ramadhani; Sarita Oktorina; Erry Ika Rhofita
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.774

Abstract

Biomass residue plays an essential role in rural communities due to its abundance, affordability, and renewable nature. This study examined the influence of cow dung (KS) and coconut husk (SK) composition and particle size on briquette properties, including density, moisture, ash content, and calorific value. Briquettes were produced using three compositions (80KS20SK, 70KS30SK, and 50KS50SK) and two particle sizes (40 and 80 mesh) under a densification pressure of 10 MPa. The 70KS30SK briquette with 80 mesh particles showed the highest density (≈312.38 kg/m³) and the lowest moisture content (≈1.98%). Smaller particle size improved bonding and reduced pore formation, enhancing density. Meanwhile, the 50KS50SK mixture produced briquettes with higher calorific value (13.05–14.36 MJ/kg) and lower ash content (17.16–21.59%) than other samples, indicating that composition affects energy content and residue formation. However, the calorific value and ash content did not meet the SNI 1683:2021 standards. Overall, the results highlight the potential of cow dung–coconut husk briquettes as a sustainable waste-to-energy option for rural applications.
SIFAT MEKANIK DAN FISIK 3D-PRINTED DENTAL PHOTOPOLYMER RESINS DALAM KONDISI PEMROSESAN YANG BERBEDA Ahmad Mamba'udin; Muhammad Akhsin Muflikhun; Adam Zuyyinal Adib; Dianisa Khoirum Sandi; Elfrida Rizky Riadini; Yuris Bahadur Wirawan
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.796

Abstract

Photopolymer resins have widely applied in dentistry to fabricate temporary restorations. This work gives a complete characterization of a dental non-castable photopolymer resin prepared via Digital Light Processing (DLP) 3D printing. Specimens were printed at layer thicknesses of 0.05, 0.075, and 0.1 mm, followed by post-cured treatments under UV light for 10, 20, and 30 minutes. A series of material characterization tests were performed, including assessments of hardness, moisture absorption behavior, and density measurements. The results indicate that hardness and moisture content are significantly impacted by post-curing time, while extended curing times resulted in greater specimen’s hardness and decreased moisture content. An increase in layer thickness led to a gradual reduction in hardness. A maximum hardness value of 57.7 Shore D was observed in the 3D-printed specimen, along with a highest moisture content of 1.05% MC. As expected, the specimens exhibited consistent density (1.19 ± 0.02 g/cm³) throughout all layer thickness and curing time variations. This study highlights the critical need to understand how process parameters affect dental non-castable photopolymer resin properties prior to clinical implementation.
STUDI NUMERIK KARAKTERISTIK VORTEX GENERATOR PADA MODIFIKASI AIRFOIL JOUKOWKSI DAN PADA SILINDER Re = 100,000 Fajar Anggara; Dedik Romahadi; Subekti; Alief Avicenna Luthfie
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.797

Abstract

Utilization of ocean wave energy is one of the renewable energy sources with high potential in Indonesia. The use of Vortex Induced Vibration (VIV) has been widely developed by researchers, where the vortex will self-excite to create vibrations. Of course, its efficiency will increase when installed simultaneously to form a row. Wake Induced Vortex (WIV) has greater potential because it adds vibration through a vortex generator in a row of VIVs in the wake area. This study studied the characteristics of the vortex generator that will be used in WIV. The research method used CFD simulation Fluent 2025 with 3-dimensional geometry. The mesh used is 700 thousand in the form of a hexahedral. Independent mesh studies have been conducted so that the number of meshes 700 thousand is the most optimal and does not affect the simulation results. The Y+ value used is 1, so the mesh thickness close to the wall for Re 100,000 is 1 mm. The location of the flow separation greatly affects the vortex structure and shedding frequency of each geometry. Whereas airfoil produces bigger power but it has less frequency shedding than cylinder.
EFFECT OF BLEACHING EARTH ADDITION IN THE PRETREATMENT OF USED COOKING OIL ON BIODIESEL QUALITY Devy Arysandi; Ilham Dwi Arirohman; Muhammad Rizky Zen; Aji Suhartoyo
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.826

Abstract

Used cooking oil represents a promising alternative feedstock for biodiesel production due to its environmental benefits and economic feasibility. However, its direct utilization is limited by the high free fatty acid (FFA) content, which can interfere with the transesterification process. Therefore, a pretreatment process is required. This research investigates the effect of adding bleaching earth to the pretreatment process of used cooking oil (UCO) on the quality of the biodiesel produced. The research was conducted using a laboratory-scale experimental method with variations in the bleaching earth percentage from 0.5% to 2.0% (w/w). The findings indicate that bleaching earth significantly improves the quality of UCO as a biodiesel feedstock. Nevertheless, excessive addition of bleaching earth may lead to degradation effects and reduced stability of the biodiesel. Optimal performance, corresponding to compliance with SNI 7182:2015, was achieved with the addition of 1.0% bleaching earth. The resulting biodiesel had an acid number of 0.224 mg KOH/g, a density of 851.12 kg/m³, a viscosity of 4.44 cSt, a yield of 72.84% and a calorific value of 46.92 MJ/kg. Additionally, the physical quality, that is color of the biodiesel produced, is bright yellow.
EXPERIMENTAL STUDY OF PARAFFIN-BASED PCM THERMAL STABILITY AFTER REPEATED THERMAL CYCLES FOR ENERGY STORAGE APPLICATIONS Kurniawan, Dondi; Irsyad, Muhammad; Wiyono, Apri; Yonanda, Ahmad; Prabowo, Angga Darma; Kusuma, Ardika
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.836

Abstract

Paraffin-based phase change materials (PCMs) have great potential in thermal energy storage due to their ability to absorb and release energy during the freezing and melting processes. However, the stability of their thermal characteristics after undergoing repeated heating and cooling cycles remains a challenge for long-term applications. This study aims to evaluate the phase change temperature characteristics and latent heat capacity of paraffin after undergoing 0, 200, 400, and 600 repeated thermal cycles using Differential Scanning Calorimetry (DSC) and T-history tests. The test results show that despite a slight decrease in freezing, melting temperatures changes in chemical structure after a number of cycles, paraffin still maintains its capacity to absorb and release energy quite efficiently. The latent heat capacity decreased from 142.77 J/g to 126.02 J/g over 600 cycles during the melting process. However, during the freezing process, it increased from 139.25 J/g to 147.55 J/g. These findings provide a scientific basis for optimizing paraffin-based PCM for reliable and sustainable thermal energy storage applications.

Page 17 of 17 | Total Record : 166

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