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Steam Engineering Vol. 3 No. 2 (2022): STEAM Engineering, Vol. 3, No. 2, Maret 2022
Publisher : Program Studi Pendidikan Teknik Mesin, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (236.396 KB) | DOI: 10.37304/jptm.v3i2.4024


Energy consumption in Indonesia every year shows an increasing trend, with energy sources from fossils or non-renewable energy dominating renewable energy in the national energy mix. Climate change due to fossil energy emissions and the depletion of fossil energy reserves directly encourages Indonesia to develop and utilize renewable energy, which is abundantly available in Indonesia. The purpose of this study is to examine the development and planning of the contribution of renewable energy in each sector to the national energy mix in the short to long term. Geothermal capacity total installed in 2019 2130.7 MW with a plan 7.2 GW in 2025 and 17.6 GW in 2050, hydropower total capacity in 2019 6283.3 MW with a paln 21 GW in 2025 and 41 GW in 2050, bioenergy total ini 2019 for power generator 2200 MW with a plan 5.5 GW in 2025 and 26 GW in 2050, in solar energy total capacity in 2020 as power plant 17.22 MW with a plan 6,5 GW in 2025  and 45 GW in 2050, in wind energy until 2020 total capcity for electrical energi 153. 83 MW with a plan 1.8 GW in 2025 and 28 GW in 2050, and the marine energy energy sector in Indonesia has not yet been utilized as an energy harvester. In general, the government targets an increase in the percentage of renewable energy in the national energy mix in the short term until 2025 with a 23% contribution, and in the long term until 2050 with a 31% contribution.
Effect of Webbing Angle on Tensile and Bending Strengths in Human Hair Fiber Reinforced Composites Paundra, Fajar
ROTASI Vol 24, No 1 (2022): VOLUME 24, NOMOR 1, JANUARI 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.1.30-35


Composite is a combination of two or more materials that have different basic properties. This study aims to analyze the effect of woven angle on hair fiber composites on tensile and bending strength. The composite is composed of polyester resin and human hair waste. Hair was soaked in 5% NaOH solution for 1 hour and woven with angle orientation 0°/90°, 15°/105°, 30°/120° and 45°/135°. The process of making composites is made by the Compression Molding method for 24 hours. After making the composite, a density test was carried out with the ASTM C271 standard, tensile test with ASTM D3039 standard and bending test with the ISO 178 standard. The results of the density test obtained an increase in the density value with the lowest density value of 0.82 g/ml and the highest 0.85 g/ ml to produce a lighter composite. Then the tensile test results show the highest tensile strength value of 16.47 MPa which occurs at an angle of 0°/90°. The results of the bending test obtained an increase in bending strength with the highest bending strength value of 47.1 MPa which occurred at an angle of 0°/90°.
Optimasi Desain Mesin Punch Menggunakan Metode Finite Element Analysis elmiawan, puguh; Paundra, Fajar; Pradibyo, Gigih Tujo
J-Proteksion Vol 6, No 2 (2022): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v6i2.6834


Pemodelan 3D dan analisa statis dilakukan dengan perangkat lunak Solidworks 2019 menggunakan metode finite element analysis (FEA). Hasil dari analisa statis tersebut, didapatkan yaitu tegangan von mises dengan nilai minimal 0,031 kgf/cm2 dan nilai maksimal 78,630 kgf/cm2, Strain dengan nilai minimal strain yaitu 80,460 pada node 132 dan nilai maksimal strain sebesar 200.989,766 pada node 79, dan Factor of safety dengan nilai maksimal yaitu adalah 200.989,76 FOS dan nilai minimal yaitu 80,460 FOS. Optimasi desain dilakukan untuk mengurangi massa dan dimensi dari rangka mesin punch pelat nomor. Nilai safety factor yang diatur di awal adalah 2, pada proses simulasi didapatkan desain awal adalah 63 FOS dan pada desain akhir sebesar 31 FOS. Massa rangka pada awal desain sebesar 76565 gram dan pada akhir desain sebesar 54695 gram.