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All Journal International Journal of Renewable Energy Development Rekayasa Mesin DINAMIKA Jurnal Ilmiah Teknik Mesin Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin Jurnal Fokus Elektroda : Energi Listrik, Telekomunikasi, Komputer, Elektronika dan Kendali Fokus Elektroda: Energi Listrik, Telekomunikasi, Komputer, Elektronika dan Kendali) Jurnal Pengabdian Masyarakat Ilmu Terapan (JPMIT) Piston: Jurnal Teknologi Jurnal Polimesin
La Ode Ahmad Barata
Jurusan Teknik Mesin, Universitas Halu Oleo
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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ANALISIS KARAKTERISTIK ALIRAN MELALUI PENAMPANG PERSEGI PANJANG MENGGUNAKAN MODEL TURBULEN LARGE EDDY SIMULATION (LES) Barata, La Ode Ahmad; Samhuddin, Samhuddin
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1495

Abstract

Dynamic response, fatigue, and stability issues of a structure are closely related to flow behavior past a bluff body structure. Flow past the free-end rectangular prism is investigated numerically using a Large Eddy Simulation (LES) turbulence model at Re = 22000. The prism model has a constant depth (D) to width (H) ratio D/H = 0.5 for span length variation L (= 10; 7,5; 5,0 and 2,5H). Effects of the free end on the flow characteristics showed that the flow pattern, velocity vector, and fluid forces component are changed. The presence of the free end is closed related to the flow characteristics alteration in the wake, which is presented graphically in this paper. This study suggests the critical aspect ratio of the slender rectangular is 2,5<L/H<5,0 The prism with critical aspect L = 2,5H presented an unusual flow behavior among the test models. The dynamic response of the test model affects the flow pattern in the wake, which is indicated by alteration of the region and intensity of vorticity, velocity vector, hydrodynamic force components, and other local components.
Performance evaluation of a standalone solar PV system : a case study in Kendari, Southeast Sulawesi, Indonesia Barata, La Ode Ahmad; Samhuddin, Samhuddin; Efendi, Rustam; Tando, Arjal
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6434

Abstract

Rising energy demand and environmental concerns are driving efforts to find alternative energy sources. Photovoltaic (PV)-based power generation is a clean energy solution that continues to be developed for reliable energy supply. This study aimed to analyze global horizontal irradiance (GHI) and evaluate the performance of a PV-based power generation model in Southeast Sulawesi, Indonesia (latitude: -4.002°, longitude: 122.6°). The study was conducted from March to May 2024 using a commercial PV panel with a rated maximum power of 50 Wp. Instantaneous values of GHI, voltage, and electric current were recorded simultaneously. GHI data were closely related to the clearness index (Kt) and the diffuse fraction of solar irradiance. The highest hourly average GHI was observed in March, reaching 1.08 kW/m², while values in April and May ranged from 0.97 to 0.99 kW/m². The system achieved a daily average maximum power output of 34.53 watts and an instantaneous peak of 49.03 watts. The maximum daily efficiency, 12.48%, was recorded in May. Power conversion performance was found to correlate strongly with GHI and Kt values, with greater stability in these parameters leading to more effective energy harvesting. Additionally, solar energy was available for more than 8 hours per day under clear sky conditions during the transitional season. These empirical results provide new insights into PV performance in the region. However, long-term data collection and incorporation of temperature effects, especially in the dry season, will provide power reliability assessment and extend system usability in off-grid applications in the region. 
Perancangan dan Pengujian Pompa Hidram Salimin; La Ode Ahmad Barata
Piston: Jurnal Teknologi Vol 6 No 2 (2021): Desember 2021
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v6i2.35

Abstract

One technology that can be used to move water from a low place to a high place is a water pump without the use of electricity and fuel (Hydraulyc Ram/Hydraulic Pump). A water pump without the use of electricity and fuel (Hydraulyc Ram/Hydram Pump) is an automatic pumping device that uses water to lift some of the water flow to a higher place. The energy source for water pumps without the use of electricity and fuel (Hydraulyc Ram / Hydram Pumps) comes from high pressure which is caused by the phenomenon of water blowing due to a sudden change in speed of the water flow by closing the valve, so this pump does not require an external energy supply such as fuel oil or electricity. This article presents a report on the design, manufacture and performance field testing of hydraulic pumps. The test results show that the pump design can drain 0.3 liters/second of water with a maximum head of 8.1 meters and a distance of 10.5 meters. By looking at the potential for its use which is quite broad, research to optimize this pump needs to be continuously carried out in order to obtain a design that is quite accurate in accordance with field conditions in Indonesia.
Ekstraksi Serat Alam Untuk Aplikasi Material Komposit Dengan Mesin Dekortikator Nanang Endriatno; La Ode Ahmad Barata
Piston: Jurnal Teknologi Vol 9 No 1 (2024): Juni 2024
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v9i1.54

Abstract

Natural fibers have advantages compared to synthetic fibers because they are biodegradable and sustainable. The problem with natural fibers is the extraction or separation process of the skin and fiber. This research aims to design a decorticator that separates leather and natural fibers to be used as composite reinforcing materials. The procedure for creating a decorticator machine is carried out by collecting initial data and requirements about the decorticator machine, determining effective decorticator machine technology and mechanisms, designing concepts and mechanisms, and planning detailed drawings. From this research, a decorticator design was created with a frame component that functions as the primary support for the machine components; the beater shaft functions to scrape the stem by moving quickly and breaks the outer layer of the stem so that the fibers can be separated, the rolling cylinder functions to hold the fiber during the process of separating the fiber and stem, the machine cover functions to provide safety during operation, the petrol motor as the driving force, and the pulley-belt transmission system. Apart from separating fiber from non-fiber parts, decorticator machines can also increase the use of environmentally friendly natural fibers as composite materials and reduce dependence on synthetic materials.
Sistem Perawatan Water Treatment Plant (WTP) PLTU Nii Tanasa 3 x 10 MW La Ode Ahmad Barata
Piston: Jurnal Teknologi Vol 9 No 1 (2024): Juni 2024
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v9i1.56

Abstract

The power plant (PLTU Nii Tanasa) is located in Nii Tanasa Village, Soropia District, Konawe Regency, Kendari - Southeast Sulawesi. This 17.64 ha PLTU consists of 2 units, each producing 10 MW of electricity. The steam power plant system requires a water treatment system to change the water content from sea water to demin water or fresh water (WTP). Water treatment systems in the steam power plants are important to ensure efficient and sustainable operation. The water used in the steam cycle must be of high quality to prevent damage to boilers, turbines, and other components. The stages of water treatment include: Pretreatment, Demineralization, Degasification, Chemical Dosing, blowdown, condensate polishing, cooling water treatment. In the Water Treatment Plant process, the water conductivity is reduced to < 1 μs, this is done so that the electrical conductivity contained in the water is very small so as to minimize the potential for corrosion, and other oxidation processes. In addition to pH, the other parameters of boiler fill water are TDS, and water pH. The types of maintenance observed in this activity are preventive maintenance, and corrective maintenance. Preventive maintenance includes Sea water pump components, multimedia filters, active carbon filters, micron filters, HP pumps, SWRO. The corrective maintainaice in this observation includes micron filter equipment, SWRO, BWRO. The component maintenance process of the WTP has a direct effect on water quality so that it is related to the performance of the Pwer plant for both in terms of thermal performance and economical aspects.
Analisis Kekuatan Rangka Mesin Pencacah Nilam dengan Menggunakan Metode Elemen Hingga Nanang Endriatno; La Ode Ahmad Barata; Salimin
Piston: Jurnal Teknologi Vol 9 No 2 (2024): Desember 2024
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v9i2.74

Abstract

Frames are often used as essential elements in the construction of machines and various other engineering products. The strength of the frame is significant in ensuring that the structure can withstand operational loads when used. Frame failure can cause severe damage, accidents, and substantial financial losses, so evaluating the strength of the frame before production is a critical step in the design process. This study aims to analyze the mechanical behavior of the components or frames of the patchouli chopping machine based on the maximum stress, displacement, and safety factor of the designed frame. The research method using finite element simulation technology is an efficient approach to analyzing the performance of frame structures. By utilizing simulations, a comprehensive evaluation of various parameters such as stress, displacement, and frame safety can be carried out. This process helps predict the structure's response to multiple loads received by the system. The simulation results using the finite element method show that the L-profile frame 40x40x3 mm with a cross-sectional area of ​​307.863 mm2 can withstand a maximum load of 1000 N with a maximum deformation of 0.2479 mm, which occurs at the load center. The von Mises stress distribution shows that the stress that occurs in the L-profile steel is 28.8 MPa. This value is far below the material yield strength threshold of 207 MPa. The maximum Safety Factor value that occurs in the frame is 15 ul, and there is no safety factor value below 1. The simulation results show that the analyzed frame is safe and meets the specified design requirements
Studi Karakteristik Biogas dari Kotoran Sapi dengan Penambahan Jerami La Ode Ahmad Barata; Jenny Delly; Samhuddin
Piston: Jurnal Teknologi Vol 9 No 2 (2024): Desember 2024
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v9i2.76

Abstract

Cow dung is one of the abundant energy resources, especially in rural areas, which has the potential to become an option in reducing people's dependence on fuel oil. This study aims to analyse the characteristics of biogas from cow dung as an alternative energy. The effect of paddy straw on the biogas production rate and flame characteristics was also analysed. The parameters studied were temperature, pressure, and detected gas on biogas production and flame characteristics. The results showed that biogas from cow dung produced a light blue biogas flame, with a pungent odour at a retention time period of 14 days. Flame characteristics with blue colour were observed on the 21st day of retention time, and the pungent odour (considered as a sulphur, and a carbon monoxide) was relatively reduced. Combustible gases were identified by the gas detector as EX; 100%. Other elements such as sulphur and carbon monoxide were indicated as H2S and CO by the gas detector. The intensity of these two elements decreased as the retention time increased up to 28 days. The addition of the straw of 10% of the cow dung increased the pressure rate and mass of biogas produced on day 7. The biogas combustion test on day 14 showed that the addition of straw reduced the intensity of methane gas, which was characterized by a pale blue flame due to the dominance of carbon monoxide. The effect of straw addition on biogas intensity was observed on day 21, in which the visual intensity of the flame was greater than the feedstock without the straw. In the retention time above 21 days, the straw biomass has been completely degraded, thus increasing the intensity of the burning gas flame. This study recommends carefully handling of straw biomass for additional feedstock and catalyst in the biogas production of cow solid manure such as shredding, ideal composition, and pre-treatment of non-degradable substances. 
Uji karakteristik briket campuran serbuk kayu dan tandan kosong Sawit sebagai bahan bakar alternatif La Ode Ahmad Barata; Masharib Al Akhyar; Aminur; Amrullah; Akbar Naro Parawangsa
Piston: Jurnal Teknologi Vol 9 No 2 (2024): Desember 2024
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v9i2.77

Abstract

Advances in technology made the use of fossil fuels a major issue, while the sources of fossil fuels continue to decrease due to their perishable nature. Biomass, including waste such as sawdust and oil palm empty fruit bunches, has potential as an alternative energy source that can be converted into briquettes. This study aims to determine the characteristics of biomass sawdust and oil palm empty fruit bunches as briquette materials as an alternative to fossil fuels. This research was conducted experimentally to determine the optimal formulation of a mixture of Wood Powder (SK) and Empty Palm Bunches (TKKS) in making briquettes. Composition variations tested include 100% SK, 100% TKKS, 50% SK: 50% TKKS, 70% SK: 30% TKKS, 30% SK: 70% TKKS. The results showed that the ultimate and proximate characteristics of 100%SK and 100%TKKS have good fixed carbon content. Based on the heating efficiency test, the best value is with the composition of 100% SK with 10% starch adhesive getting a combustion efficiency value of 7.65%. The best porosity index was obtained in the formulation of 70% SK: 30%TKKS with a value of 1.52%, while the best durability index is in briquettes with a composition of 100%TKKS with 10% starch adhesive getting a value of 0.12%. The briquette properties of sawdust and empty palm kernel can be the initial data in the development and use of biomass briquettes or co-firing fuel for industrial furnace because it has good mechanical and physical properties. Thermal efficiency test in the field should use biomass stoves to obtain accurate biomass performance data.
Pradesain Mesin Cuci Mobil Semi Otomatis dengan Autodesk Inventor Samhuddin; La Ode Ahmad Barata; Jaka Seru Dwi Saputra
Piston: Jurnal Teknologi Vol 9 No 2 (2024): Desember 2024
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v9i2.78

Abstract

A car wash is a facility used to clean the outside and inside of a car, which can be done manually and automatically. The use of an automatic system allows car washing to be faster than a manual washing system that still relies on human labor. The car washing machine pre-design article provides an overview of automatic car washing pre-design. This planning uses the Autodesk inventor application with 6061 aluminum material with a design size of 80 mm × 80 mm × 5 mm. In this plan, the planned water requirement is 300L/car, where the nozzle radius r1 = 25 mm, r2 = 10 mm, and nozzle pressure of 24,410 Pa with 24 nozzles. Electric power is used at 1310 watts where the pump pressure is 34,872 Pa. All frame loads and other supporting components were analyzed using Autodesk InventorTM software. The maximum stress and strain, deflection and safety factor of the frame were also analyzed. This article presents the design of the controller system using Arduino. The general design of the water circulation system is also shown in the design proposal of this machine.
Studi Kekuatan Tarik Komposit Serat Sabuk Kelapa Antisymmetric Laminates Samhuddin; Aminur; Sri Amrin Al Kadirun; La Ode Ahmad Barata
Piston: Jurnal Teknologi Vol 10 No 1 (2025): June 2025
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v10i1.92

Abstract

The utilization of natural fiber-based composite materials is increasingly developing as an environmentally friendly alternative to synthetic materials. Coconut sheath fiber is an agricultural waste with potential as reinforcement in polymer matrices due to its strength and flexibility. This study focuses on the tensile strength of coconut sheath fiber composites in antisymmetric laminate configurations, which have not been widely explored. Such configurations are expected to enhance mechanical performance, particularly in lightweight structural applications. The study aims to analyze tensile characteristics and understand the influence of laminate orientation on the mechanical properties of the composite. The problem addressed is how tensile strength behaves in coconut sheath fiber antisymmetric laminates with fiber orientations of [-45°/+45°/-45°/+45°] and [-30°/+30°/-30°/+30°]. A quantitative research method was used, consisting of the following stages: (1) fiber preparation, (2) fiber soaking, (3) mold fabrication, (4) composite fabrication, (5) specimen preparation, and (6) tensile testing. The results showed that the highest average tensile stress was obtained in the +45°/-45°/+45°/-45° orientation, with a value of 10.578 MPa, a tensile strain of 2.452%, and an elastic modulus of 0.004 GPa. The positive contribution of this study lies in revealing the potential of coconut sheath waste as a reinforcing material for composites with promising mechanical performance under specific laminate configurations. However, the study is limited in the range of fiber orientations explored and does not include evaluations under other mechanical loads such as bending and impact. Further studies are recommended to investigate a wider range of fiber orientations and to conduct multiaxial mechanical testing to obtain a more comprehensive understanding of the composite behavior.
Co-Authors Abd. Kadir Akbar Naro Parawangsa Akbar Naro Parawangsa Aksar, Prinob Aminur Aminur Aminur Aminur Amrullah Amrullah Ardian Sumantri Arjuna, Muhamad Arnold Oscar F.R. Budiman Budiman Budiman Sudia, Budiman DWI SURYANTO Harjum La Bau Hasanudin, La Idul, Idul Jaka Seru Dwi Saputra Jaka Seru Dwi Saputra Jenny Delly Kadir Kadir Kiwata Takahiro Kiwata, Takahiro La Hasanudin Lukas Kano Mangalla, Lukas Kano Masharib Al Akhyar Muh Fadhil Safli Muh. Ilcardi Ralda Muhamad Laskar Wahid Muhammad Abdillah Muhammad Alfian Muslimin, Salman Nanang Endriatno Nanang Endriatno Nining Mahmuda Meliana Nurjannah Yusman Nurudin, La Ode Rivaldy Rizki Rustam Efendi Ryan Aspari Salimin Salimin Samhuddin Samhuddin Samhuddin Samhuddin Samhuddin Samhuddin Samhuddin, Samhuddin Sarifudin sarifudin, Sarifudin Septianus T.L. Sigit Santoso Sri Amrin Al Kadirun Sudarsono Sudarsono Sudarsono Sudarsono Suratin, Dedi Mardeni Suriyadi Takahiro Kiwata Tando, Arjal Taufik, Muhamad Rian Toshiyuki Ueno Ungo Ibuhasa Urzunil Kadim Yolli Fernanda Zulkifli Ananda