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All Journal Semesta Teknika Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat EPI International Journal of Engineering
Mochtar, Andi Amijoyo
Departemen Teknik Mesin, Fakultas Teknik, Universitas Hasanuddin, Gowa
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Public Health

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Calculation and Simulation of Aluminium Alloy Flange Reducer Cast Using Resin Sand Mold Andi Ari Putra; Muhammad Syahid; Andi Amijoyo Mochtar
EPI International Journal of Engineering Vol 4 No 2 (2021): Volume 4 Number 2, August 2021
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082021.01

Abstract

One of the causes of defects in casting is due to poor gating system design. In conventional casting methods, the gating system design process is carried out by trial and error to find the best design results. Computer modeling and simulation offer process design in a much faster time, and at much less cost, compared to conventional methods. The gating system design approach with a combination of well calibrated simulation software can avoid defect before casting. Casting simulation helps to visualize the phenomena of filling, molten metal solidification, and shrinkage porosity. The resulting casting simulation can be displayed in graph variants at specific nodes with line graphs or numerical numbers manually. This study discusses the simulation of casting a flange reducer from aluminum alloy material using a resin sand mold. The initial dimensions of the gating system used are sprue of 14.5 x 8.4 x 180 mm, runner 147 x 10 x 5.5 mm, ingate 80 x 10 x 5.5 mm with a bottom gate channel system. Total of dominant porosity that occurs using the initial gating system is 65.31 % and show the undirectional solidificiation behavior. After modifying the gating system and increasing the riser size, the simulation results show directional solidification behavior starting from the thinnest part to the thickest part and ending at the riser. The shrinkage porosity can compensate with the total of porosity is 57.60 % at the riser . Modification of the channel system is required to obtain a sound casting or porosity free.
Kajian Komputasi Pengaruh Penerapan Blowing pada Bagian Belakang Model Kendaraan Rustan Tarakka; Nasaruddin Salam; Andi Amijoyo Mochtar; Muhammad Ihsan; Wawan Rauf
Semesta Teknika Vol 25, No 1 (2022): MEI 2022
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v25i1.13478

Abstract

Drag aerodinamika pada kendaraan disebabkan adanya tekanan rendah dan separasi aliran di bagian belakang, yang berdampak pada menurunnya kecepatan, meningkatnya penggunaan bahan bakar, dan turunnya efisiensi kendaraan. Blowing merupakan salah satu pilihan rekayasa kendali aktif aliran yang dapat diterapkan pada desain kendaraan yang dapat mengendalikan pembentukan separasi aliran dan berefek positif berupa pengurangan hambatan aerodinamis. Penelitian ini bertujuan menganalisis pengaruh penerapan blowing terhadap pola aliran, distribusi tekanan, dan hambatan aerodinamika yang bekerja pada bagian belakang model. Dengan bantuan CFD Fluent 6.3, model uji yang digunakan adalah model kendaraan dengan sudut kemiringan geometri depan (α) 35o dan rasio terhadap model Ahmed bodi original adalah 0.17 (1:6), yang dilengkapi dengan blowing dengan kecepatan 1.0 m/s. Hasil komputasi mengindikasikan bahwa penerapan blowing dapat mengurangi pembentukan wake dan menunda separasi aliran dan dapat meningkatkan koefisien tekanan minimum pada bagian belakang model kendaraan sebesar 24.690%. Pengurangan hambatan aerodinamika diperoleh sebesar 9.583%.
Aplikasi Pompa Air Tenaga Matahari untuk Petani Palawija di Kabupaten Takalar Jalaluddin Haddada; Rustan Tarakka; Andi Nurfaidah Rahman; Andi Amijoyo Mochtar; Syahrir Arief
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 1 No 2 (2018): Improving Quality of Life within Society
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (843.051 KB) | DOI: 10.25042/jurnal_tepat.v1i2.35

Abstract

Kabupaten Takalar merupakan salah satu daerah di provinsi Sulawesi Selatan dengan produksi jagung dan cabai rawit yang besar. Tanaman palawija ini membutuhkan sinar matahari langsung dan air yang tidak terlalu banyak sehingga penyediaan air sangat cocok dengan pemanfaatan pompa air tenaga matahari dari sumur dangkal di areal persawahan. Pemanfaatan energi matahari yang bebas polusi dan berlimpah, dapat diperbaharui serta tidak ada habisnya sangat potensial karena daerah ini mempunyai tingkat penyinaran matahari yang tinggi. Penggunaan pompa tenaga matahari untuk keperluan pengairan pada tanaman palawija akan memberi manfaat kepada para petani dengan mengurangi biaya yang harus dikeluarkan untuk penyediaan pengairan dan menjamin ketersediaan air untuk kebutuhan tanaman. Prototipe dari pompa air tenaga matahari dibuat dan telah digunakan di areal persawahan petani sebagai percontohan teknologi. Petani palawija telah dilatih terkait operasional dan perawatan pompa tenaga matahari tersebut. Implementasi dari kegiatan pengabdian ini dilaksanakan pada tanggal 20 Oktober 2018 meliputi pelatihan masyarakat dan percontohan aplikasi teknologi yang meliputi : 1) transfer teknologi ke masyarakat dilakukan untuk peningkatan pemahaman terkait pompa air tenaga matahari dan penggunaannya; 2) 1 unit pompa air tenaga matahari dipasang di areal persawahan tanaman palawija. Kegiatan ini telah membantu mempermudah masyarakat dalam memanfaatkan sumber energi terbarukan dalam pemanfaatan pompa air tenaga matahari untuk pengairan tanaman palawija. Hal ini juga akan berpengaruh dalam meningkatkan produktivitas petani palawija dengan pengurangan biaya penyedian air serta meningkatkan pendapatan petani. Hasil pengujian lapangan menunjukkan intensitas matahari rata-rata pada saat pengujian sekitar 874 W/m2 sedangkan debit air pompa rata-rata sekitar 3.8 L/menit. Pompa air tenaga matahari dapat mengisi air pada tangki berkapasitas 650 liter dengan waktu pengisian sekitar 2.8 jam.
Sosialisasi Energi Terbarukan dan Pelatihan Perakitan Listrik Tenaga Surya pada Siswa Sekolah Alam Le Cendekia Gowa Syahid, Muhammad; ., Jalaluddin; Mochtar, Andi Amijoyo; Duma, Gerard Antonini; Amme, Rudi; Kasim, Lukman; Arjun, Muh.
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 7 No 1 (2024): Community Development
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v7i1.455

Abstract

Renewable energy is energy that comes from renewable energy sources. Renewable energy sources are energy sources that can be used indefinitely and will never run out because they can be recovered in a relatively short time, including geothermal, wind, bioenergy, sunlight, water flows and waterfalls, as well as movements and temperature differences in ocean layers.” Solar panels are the main equipment in a solar power generation system which functions to convert sunlight energy into electrical energy directly. Nowadays, human dependence on energy concerns almost all aspects of life. Energy reserves originating from fossil fuels throughout the world are estimated to only be up to 40 years for petroleum, 60 years for natural gas, and 200 years for coal. The condition of limited energy sources in the midst of increasing world energy needs from year to year (energy consumption growth in 2004 alone was 4.3 percent), as well as to protect the earth from global warming and environmental pollution makes the demand for immediate realization of new technology for renewable energy sources. Therefore, the Community Service Team of the Department of Mechanical Engineering, Faculty of Engineering, Hasanuddin University held community service at the LE CENDEKIA Nature School on December 14 2023. The aim of this service is to increase understanding regarding renewable energy and carry out simple applications of renewable energy for students. The method of implementing the service is by interview on the importance of renewable energy and training in solar power assembly. There were 25 socialization and training participants. Community service results show an increase in understanding of the importance of renewable energy from 20% to 50%, and knowledge about solar power assembly from 5% to 45%.
Sosialisasi Mekanisme Kontrol Ultraviolet-C (UVC) Desinfektan Penanganan Covid -19 di Kabupaten Pinrang Mochtar, Andi Amijoyo; Sule, Luther; Tarakka, Rustan; Azis, Nasruddin; Mire, Baharuddin; Mangkau, Andi; ., Fauzan
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 7 No 1 (2024): Community Development
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v7i1.466

Abstract

Public services are interactions between society and the government as public servants. This service activity involved the Pinrang Regency Investment and Integrated Service Agency (DPMPTS) and academics from the Mechanical Department, Faculty of Engineering, Hasanuddin University. Utilizing this disinfectant tool can help the DPMPTS service in terms of air sterilization and preventing the spread of Covid-19 in community service spaces. The problem that arises is the level of interaction between the community who needs services and DPMPTS employees as service providers who are quite vulnerable to the spread of viruses and bacteria. This can cause the spread of disease, so tools are needed that can reduce the impact of the spread of the disease. The use of Ultraviolet C (UVC) is a disinfectant tool that has been proven effective in killing microorganisms, one of which is the COVID-19 virus. The service method is carried out using an outreach mechanism at the DPMPTS agency which is attended by technical government agencies and several participating local communities. The process of implementing socialization uses a questionnaire mechanism consisting of pre-test and post-test. At the start of the socialization, the number of respondents who filled out the questionnaire was 18 people consisting of 8 government representatives and 10 community representatives or a total of 18 respondents. In the pre-test results, it was found that only 3 people understood the function of the mobile robot disinfectant system mechanism and 15 people did not understand. After the socialization was carried out, better results were obtained with 17 people who understood and 1 person who still did not understand the working system of the mobile disinfectant robot. Therefore, it is recommended to use mobile disinfectant robots in DPMPTS public service spaces to reduce the effects of spreading viruses and bacteria.
Welding Skills Improvement Training in Lanne Village, Pangkep Regency Amme, Rudi; Salam, Nasaruddin; Renreng, Ilyas; Tarakka, Rustan; Arma, Lukmanul Hakim; Arsyad, Hairul; Mochtar, Andi Amijoyo; Hayat, Azwar; Sakka, Asriadi
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 8 No 1 (2025): Community Empowerment through Higher Education Community Service Programs
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v8i1.577

Abstract

The welding method combines two or more pieces of metal by melting the material to be joined. The joining of two or more base metals through melting or without melting the joint area is known as welding technology. Karang Taruna Desa Lanne is a village government program for youth empowerment. Currently, the youth organization has a program that still needs to be improved to increase the productivity of youth organization members. Therefore, the training program to improve welding skills initiated by the Department of Mechanical Engineering, Faculty of Engineering, Hasanuddin University, is expected to positively impact partners. The activity was carried out by providing training material followed by welding practice activities to determine the ability of participants to apply the material provided previously. In addition, the pre-test and post-test questionnaires were given to the participants before and after the training to determine the program's success rate. Based on the quantitative analysis of measurements before training, it was found that 85% did not understand and 15% did not understand how to prepare for welding. After the training, it was found that 65% of the participants understood, 25% understood, and 10% understood very well when preparing for welding. This indicates that the activities carried out have a positive impact on partners.
Co-Authors ., Jalaluddin Amme, Rudi Andi Ari Putra Andi Mangkau Andi Nurfaidah Rahman Arjun, Muh. Azis, Nasruddin Baharuddin Mire Duma, Gerard Antonini Fauzan . Hairul Arsyad Hayat, Azwar Ilyas Renreng Jalaluddin Haddada Kasim, Lukman Lukmanul Hakim Arma Luther Sule Muhammad Ihsan Muhammad Syahid Muhammad Syahid Nasaruddin Salam Nasaruddin Salam, Nasaruddin Rauf, Wawan Rustan Tarakka Sakka, Asriadi Syahrir Arief