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Perancangan Pembuatan Kapal Tenaga Surya Skala Miniatur Suriyadi; Ungo Ibuhasa; Muhammad Abdillah; Rizki; La Ode Ahmad Barata; Samhuddin
Piston: Jurnal Teknologi Vol 7 No 2 (2022): Desember 2022
Publisher : Program Pendidikan Vokasi Teknik Mesin

A solar-powered ship is a means of marine transportation that is designed in such a way that its use is different from ships in general. This ship relies on solar energy as the main fuel so that this ship uses solar panels to capture sunlight and is stored in batteries/batteries as energy to drive a DC motor so that the electric ship can move stably. The goal is to be able to complete the final task. The method used in this final project uses the method of collecting data by searching for books, journals and modules related to the design title as a reference for the tool that the researcher designed. The result of this design is that the solar powered electric boat with 250 watts of power takes 59 seconds at a distance of 10 meters. 23 cm using a 50 Watt solar panel, 12 Volt Battery/Battery and 12 Volt DC Dynamo/Motor. As a boat engine and also an electric boat, this is very good as an alternative means of transportation that is environmentally friendly with no operational costs and small maintenance costs.

Analisa Pengaruh Penambahan Unsur Cu (Tembaga) Terhadap Sifat Mekanis Al – Si Melalui Proses Casting Samhuddin; Al Ichlas Imran
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.v6i2.34

The purpose of this study is to determine the effect of the elements copper (Cu) on the mechanical properties of aluminum silicon (Al-Si). The mechanical properties of aluminum are lightweight, low temperature, corrosion resistance, mechanical properties vary (strength, hardness and ductility), good formability, and capable of a good cast. While the mechanical properties of copper are formability, good electrical conductivity, good thermal conductivity, good corrosion resistance, has a density of 8.93 g / cm³, the modulus of elasticity of 115 GPa and liquid temperature 1083 ° C. Materials used were Al-Si and the element copper alloy. The addition of the element copper (Cu) amounting to, 2%, 4%, 6% and 8%. Manufacturing of specimens with sand casting process. Mechanical testing were hardness and impact. In this study get the biggest hardness value alloy Al - Si addressed by the addition of Cu 0% or without alloy of 96.53 Kg / mm2, while the lowest hardness value of alloy Al - Si indicated by the addition of 2% Cu at 63.74 Kg / mm² , The strength values impack alloy Al - Si addressed by the addition of 8% Cu 0.026 J / mm2, while the value of impact strength low alloy Al - Si Cu indicated by the addition of 6% of 0,018 J / mm².

Analisis Kekuatan Konstruksi Pada Alat Angkat Kapasitas 500 Kg Menggunakan Software Comsol Multiphysics Lukas Kano Mangalla; Samhuddin
Piston: Jurnal Teknologi Vol 6 No 1 (2021): Juni 2021
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v6i1.37

Lifting equipment is a tool that can alleviate human tasks in terms of the removal objects that have a weight beyond human ability. Mechanical Engineering laboratory of Halu Oleo University (UHO) has lifting equipment with 500 Kg capacity, but construction of this model is not stable and faltered when lifting the weights. This study aim to improve the ability of this equipment for several purposes as well as to produce a draft model of lifting equipment more powerful, economical and has a good aesthetic design. This study was a static load simulation model using COMSOL Multiphysics. Three variations model (model 1, model 2 and model 3) of the construction were simulated with 500 kg of loads. Power stress distributions on the support constructions is the main point in this research for the powerful and useful construction. Furthermore, the good aesthetic designs the important parameter involving on this models. Result of this study shows that the portable crane existing on the Mechanical laboratories needs some improvements on construction, model and aesthetics for 5000kg loads. Model 3 has more powerful and economically construction as well as better aesthetic value than another models investigated.

Pengaruh Kendali Turbulensi Aliran terhadap Bidang Aliran Di Sekitar Struktur Persegi Samhuddin; La Ode Ahmad Barata; Nurjannah Yusman
Piston: Jurnal Teknologi Vol 8 No 1 (2023): Juni 2023
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v8i1.42

The characteristics of the flow passing over the structure affect the stability, aerodynamic design and response of the structure to the flow patterns passing over it. This study numerically examines the effects of using a splitter plate on the velocity pattern, pressure, aerodynamic forces and flow deformation at a Reynolds number of 104. This study used a 2D double-type flow splitter on the downstream side with a k-ε turbulent model using ANSYS FLUENT 18.2 software. Numerical simulation results show that the use of splitter plate has changed the flow pattern passing through the square cylinder which is indicated by the reduction of negative flow zone, pressure recovery, and decrease of drag force. The flow deformation pattern is different from the cylinder without a splitter plate. Numerical data are also shown in the form of flow contours to verify the graphical data shown in the present study. This study also shows that the use of a splitter plate also shows different grid sensitivity from a regular square cylinder, so the grid sensitivity validation-verification test of a cylinder with a splitter plate is not recommended for similar cases.

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

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.

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

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

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.

Rancang Bangun Alat Pengiris Tempe Dengan Menggunakan Penggerak Motor Listrik Sudarsono; Samhuddin; La Ode Ahmad Barata; Muhamad Laskar Wahid; Urzunil Kadim; Zulkifli Ananda
Piston: Jurnal Teknologi Vol 10 No 2 (2025): Desember 2025
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v10i2.124

Perkembangan dunia usaha menuntut adanya mesin yang dapat meningkatkan produtifitas usaha bagi kalangan industri utamanya pelaku usaha kecil - menengah. Karenanya, diperlukan mesin tepat guna dalam mendukung perkembangan usaha. Penggunaan motor bakar tentu menjadi tidak efisien dalam hal penggunaan bahan bakara dan kontaminiasi dengan produk yang dihasilkan. Mesin listrik menjadi pilihan utama dan praktis untuk mendukung produktifitas pelaku usaha. Rancang Bangun Alat Pengiris Tempe Dengan Menggunakan Penggerak Motor Listrik ini bertujuan untuk meningkatkan efisiensi dan keamanan proses pengirisan tempe yang umumnya dilakukan secara manual oleh pelaku UMKM. Mesin ini dirancang menggunakan motor listrik sebagai penggerak utama yang memutar pisau pemotong melalui sistem transmisi pulley dan V-belt. Hasil pengujian menunjukkan bahwa alat ini mampu mengiris tempe dengan ketebalan seragam (2–3 mm) dan kecepatan waktu rata-rata 3 detik per unit tempe. Tingkat keberhasilan pemotongan mencapai 95,7% untuk bentuk tempe kotak, menjadikan alat ini sangat layak untuk meningkatkan produktivitas industri makanan skala kecil. Alat ini masih memerlukan peningkatan kinerja alat seperti pengaturan putaran pengiris.

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