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Prototipe Turbin Angin Savonius Variasi Extra Layers Dengan Pengujian Real Wind Condition Yudi Kurniawan; Ida Bagus Dharmawan; Zulkifli Zulkifli
Jurnal POLIMESIN Vol 19, No 1 (2021): February
Publisher : Politeknik Negeri Lhokseumawe

Wind energy is renewable energy that is clean, environmentally friendly and easy to obtain. Balikpapan City is very suitable for applying the Savonius wind turbine because it has a relatively low average wind speed. Savonius wind turbine is a turbine consisting of two concave and convex blades that work based on drag forces. Savonius wind turbine can utilize wind energy at low speed 2 m/s to be converted into electrical energy which can reduce the electrical load in urban areas. This research makes a prototype of the Savonius wind turbine with the addition of variations extra layer on the concave turbine blades. The test method uses a generator that is attached to the turbine shaft and the test is carried out in a multi-storey building area. The results obtained are the Savonius wind turbine prototype capable of producing actual power 0.76 Watt and power coefficient is 0.082. The addition of an extra layer at both tips of the turbine concave blades is proven to be able to improve the performance of the Savonius wind turbine.

Analisa pengaruh perlakuan kimia pada serat terhadap kekuatan impak charpy komposit serat sabut kelapa bermatriks epoxy Zulkifli Zulkifli; Ida Bagus Dharmawan; Wahyu Anhar
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Penggunaan serat sabut kelapa pada material komposit akan menaikkan nilai komersial dari perkebunan kelapa. Kekuatan komposit berpenguat serat alam dipengaruhi oleh penyebaran serat, interaksi antara serat dengan matriks, bagaimana serat itu diperoleh, ukuran serat, dan bentuk serat. Untuk memperoleh ikatan yang baik antara matriks dan serat dilakuan modifikasi permukaan serat. Alkalisasi pada serat alam adalah metode yang telah digunakan untuk menghasilkan serat berkualitas tinggi. Penelitian ini menganalisis dan mengetahui pengaruh perlakuan kimia pada serat terhadap kekuatan impak material komposit diperkuat serat sabut kelapa bermatriks epoxy. Adapun tahapan pada penelitian ini yaitu dilakukan perendaman serat sabut kelapa pada larutan NaOH dengan konsentrasi 10%, 15%, dan 20%, selama 2 jam, lalu serat dicuci dengan menggunakan larutan H2O2 dengan konsentrasi 3% selama 1 jam. Adapun hasil dari penelitian ini yaitu perlakuan alkalisasi terhadap komposit serat sabut kelapa mempengaruhi sifat kekuatan impak dari material komposit dengan kekuatan impak dan energi serap material komposit memiliki hubungan terbalik terhadap jumlah konsentrasi larutan alkalinya. Makin tinggi konsentrasi larutan alkalinya yang diberi pada serat akan menyebabkan makin kecilnya energi serap dan kekuatan impak dari material komposit berpenguat serat sabut kelapa.Kata kunci : komposit, serat sabut kelapa, NaOH, H2O2, kekuatan impak Effect of chemical treatment of composite coir fiber with epoxy matrix on the Charpy impact strengthAbstractThe use of coconut fiber in composite materials will increase the commercial value of coconut plantations. The strength of a natural fiber-reinforced composite is influenced by the spread of the fiber, the interaction between the fiber and the matrix, how the fiber is obtained, the size of the fiber, and the shape of the fiber. To obtain a good bond between the matrix and the fiber surface fibers are modified. Alkalization of natural fibers is a method that has been used to produce high-quality fiber. This study analyzes and examines the effect of chemical treatment on fiber on the impact strength of composite materials reinforced with epoxy coconut fiber coir fiber. The stages in this study were first carried out soaking coconut coir fiber in NaOH solution with a concentration of 10%, 15%, and 20%, for 2 hours, then the fiber was washed using H2O2 solution with a concentration of 3% for 1 hour. The results of this study are the alkalization treatment of coconut coir fiber composites affecting the impact strength properties of composite materials where the impact strength and absorption energy of composite materials have an inverse relationship to the amount of alkaline solution concentration. Where the higher the concentration of the alkaline solution given to the fiber will cause the smaller the absorbing energy and the impact strength of the composite fiber-reinforced coconut fiber.

Analisa pengaruh perlakuan alkalisasi dan hydrogen peroksida terhadap kekuatan mekanik komposit serat sabut kelapa bermatriks epoxy Zulkifli Zulkifli; Ida Bagus Dharmawan
Jurnal POLIMESIN Vol 17, No 1 (2019): Februari
Publisher : Politeknik Negeri Lhokseumawe

Komposit polimer dengan serat alam sangat ramah lingkungan karena mampu terdegradasi secara alami dan juga harga serat alam pun lebih murah dibandingkan bahan serat sintetis. Penelitian ini bertujuan untuk mengetahui pengaruh perlakuan NaOH pada serat sabut kelapa terhadap kekuatan mekanik material komposit yang diperkuat serat sabut kelapa. Adapun tahapan pada penelitian ini yaitu (1) perendaman serat sabut kelapa pada larutan NaOH dengan konsentrasi 10%, 15%, dan 20%, selama 2 jam, (2) mencuci serat sabut kelapa yang telah direndam dengan menggunakan larutan H2O2 dengan konsentrasi 3% selama 1 jam, (3) serat sabut kelapa dikeringkan di dalam kamar pada temperature kamar sekitar 300C selama 7 hari, (4) pembuatan material komposit dengan metode press molding, (5) melakukan pengujian tarik sesuai standar ASTM D-638. Hasil dari penilitian ini yaitu pengaruh perlakuan NaOH dengan konsentrasi larutan 15% pada serat sabut kelapa menunjukkan nilai tegangan tarik yang paling optimal yaitu sebesar 23.497 MPa dan nilai regangannya sebesar 3.918% pada material komposit, hal ini disebabkan oleh ikatan interface antara serat dan matrik menjadi lebih kuat sehingga tegangan dapat terjadi secara merata, sebelum terjadi patah pada material komposit. Kata kunci: komposit, serat sabut kelapa, NaOH, H2O2, kekuatan mekanik. AbstractComposite polymers with natural fibers are very environmentally friendly because they can be degraded naturally and also the price of natural fibers is cheaper than synthetic fiber. This study aims to determine the effect of NaOH treatment on coconut fiber on the mechanical strength of coco fiber reinforced composite materials. The stages in this study are (1) soaking coco fiber in NaOH solution with a concentration of 10%, 15%, and 20%, for 2 hours, (2) washing coconut coir fibers that have been soaked using H2O2 solution with a concentration of 3% for 1 hour, (3) coconut coir fibers are dried in the room at room temperature around 300 C for 7 days, (4) making composite materials using the press molding method, (5) carrying out tensile testing according to ASTM D-638 standard. The results of this research are the effect of NaOH treatment with a concentration of 15% solution on coconut fiber shows the most optimal tensile strength of 23,497 MPa and the strain value is 3,918% in composite materials, this is due to the bonding between fibers and matrices strong so that stress can occur evenly, before a composite material breaks. Keywords: composite, coconut fiber, NaOH, H2O2, tensile strength.

Pengaruh media pendingin terhadap kekerasan dan ketangguhan hasil pengelasan material AISI 1050 pada proses las MAG Azwinur Azwinur; Muhammad Yudi; Zulkifli Zulkifli
Jurnal POLIMESIN Vol 18, No 2 (2020): Agustus
Publisher : Politeknik Negeri Lhokseumawe

The temperature of the cooling medium is a substance that serves to determine the speed of the cooling process of the material that has been given heat treatment from the welding results. Cooling is an alternative to improve and improve the mechanical properties of post-welding materials. The selection of the temperature of the cooling medium is very important to get a good connection strength. The purpose of this study was to determine the effect of the cooling media on the hardness and toughness of AISI 1050 material using the MAG welding process. The cooling media which are varied are water, sea water, and air. The welding process used is the welding process MAG (Metal active gas) with CO2 protective gas, the material used type AISI 1050 with mechanical testing hardness and impact test. The results showed that the use of the type of cooling media affects the strength of the welding joint in terms of the value of the hardness and toughness of the material receiving the load. The highest hardness value in the HAZ 1, HAZ 2 and weld metal areas occurs in the use of sea water cooling media where in HAZ 1 is 71, 63, HAZ 2 is 73.5 and weld metal is 70, while the lowest value in the use of air conditioning media where on HAZ 1 of 65.63, HAZ 2 of 63.75 and weld metal of 58.83. The impact toughness test results found that the use of seawater cooling media has the highest toughness value of 1.83 joules / mm², then followed by air media of 1.75 joules / mm², and the lowest is the water use of 1.50 joules / mm² .

Perbandingan sampah organik rumah tangga dengan sampah organik pasar terhadap kuantitas biogas Subur Mulyanto; Zulkifli Zulkifli; Elisabeth Milaningrum
Jurnal POLIMESIN Vol 16, No 2 (2018): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Abstrak Penelitian ini bertujuan untuk mengetahui bagaimana cara dan proses pembuatan biogas untuk mendapatkan hasil yaitu gas metana (CH4) secara maksimal dengan menggunakan bahan dari sampah organik makanan rumah tangga dan sampah organik pasar. Jenis penelitian ini adalah eksperimen, dimana penulis melakukan perencanaan, perancangan, pembuatan, dan pengujian secara langsung dilapangan untuk mengetahui hasil dari percobaan tersebut. Proses dalam penelitian menggunakan bahan baku sampah pasar dan sampah organik rumah tangga yang kemudian masing–masing difermentasi selama 12 hari, setelah dilakukan pengambilan sampel untuk uji nyala dan uji kandungan gas metana yang dihasilkan. Hasil penelitian menunjukan bahwa sampah organik pasar lebih baik digunakan sebagai bahan untuk pembuatan biogas dibandingkan dengan sampah makanan rumah tangga dikarenakan sampah organik pasar tidak memerlukan waktu yang lama untuk terbakar, pada proses pengujian kandungan gas metana sampah organik pasar memiliki kandungan gas metana yang lebih tinggi yaitu 52,8 % dibandingkan dengan sampah organik rumah tangga yang hanya 0,29 %.Kata kunci: Biogas, Gas metana (CH4), Sampah organik pasar, Sampah organik rumah tangga, fermentasiAbstract This study aims to find out how the way and process of biogas production to obtain the results of methane (CH4) to the maximum by using materials from organic household food waste and organic waste market. This type of research is experimental, where the authors do the planning, design, manufacture, and testing directly in the field to find out the results of the experiment. The process in this study includes the selection of materials divided into 2, namely market waste and household organic waste which then each fermented for 12 days, after sampling for the test flame and test the methane gas content produced. The results showed that the market organic waste is better used as a material for the manufacture of biogas compared with household food waste because the market organic waste does not require a long time to burn, in the process of testing the methane gas content of organic waste market has a higher methane gas content 52.8% compared with household organic waste which is only 0.29%.Keywords: Biogas, Methane (CH4), Organic waste market, Household organic waste, fermentation

Pengembangan Produk Olahan Buah Mangrove Jenis Api-Api (Avicennia Spp) Di Kelompok Kreasi Mangrove Lestari Kelurahan Margomulyo Balikpapan Patria Rahmawaty; Zulkifli Zulkifli; Nur Amaliah; Hadi Hermansyah; Yogiana Mulyani
Jurnal ABDINUS : Jurnal Pengabdian Nusantara Vol 1 No 2 (2018): Volume 1 Nomor 2 Tahun 2018
Publisher : Universitas Nusantara PGRI Kediri

Problems faced by Mangrove Creation Group Lestari is a black mangrove fruit flour caused by the process of less rapid that is drying is too long and during the process of grinding, still simply, that is using a blender. While the blender can only accommodate small capacity and this will inhibit the process of processing raw materials into processed products. The method used in solving the problem of Sustainable Mangrove Creation Group is by socializing the processing process of mangrove flour according to standard, providing flour grinding tool to get good quality flour, and demostration processing of mangrove flour into snack and cake. Based on the results of socialization of community service in Kelurahan Margomulyo can be successful because it sees the enthusiasm of Margomulyo Kelurahan who get the knowledge related to the processing of mangrove fruit flour according to the standard, able to apply or use the disk miller, and the community get standard recipe from swissroll flour mangrove and cimi-cimi mangrove fruit flour.

Analisa Pengaruh Variasi Media Pendingin Terhadap Kekuatan Mekanik Pada Hasil Pengelasan Metode Smaw Material Baja St 52 ZULKIFLI ZULKIFLI; Basri Dahlan; Nurul Fatimah
Journal of Welding Technology Vol 1, No 2 (2019): Desember
Publisher : Politeknik Negeri Lhokseumawe

AbstrakBeberapa tahun terakhr ini perkembangan teknologi di bidang manufaktur berkembang pesat, salah satunya pada konstruksi alat berat. Konstruksi excavator pada bagian atasnya mampu berputar (swing) 360º, yang mana part boom termasuk salah satu bagian yang melakukan swing dan bekerja dengan keras karena mengangkat beban sehingga dalam proses pembuatan cylinder boom dilakukan pengelasan. Salah satu metode pengelasan yang banyak dilakukan adalah proses pengelasan SMAW (Shield Metal Arc Welding) yang juga disebut Las Busur Listrik. Penelitian ini bertujuan untuk menganalisa pengaruh variasi media pendingin terhadap hasil uji tarik pada hasil pengelasan material baja ST52. Penelitian ini menggunakan material ST52. Material di beri pelakuan las single vee joint, dimana pada saat selesai pengelasan material direndam dalam media pendingin oli bekas, collant engine, dan collant bubut selama 30 menit. Setelah itu material dibentuk sesuai standar ASTM E8/E8M-11 untuk dilakukan pengujian tarik. Hasil penelitian menunjukkan bahwa hasil pengujian tarik pada spesimen dengan media pendingin oli bekas memiliki nilai kekuatan tarik yang paling besar yaitu sebesar 48,3 Kgf/mm2 dengan nilai elongasi yang kecil yaitu 6,4% , sedangkan media pendingin yang menghasilkan nilai terendah yaitu pada collant bubut sebesar 45,49 Kgf/mm2 dengan nilai elongasi yang besar yaitu sebesar 9,61% .Kata kunci : pengelasan, kekuatan tarik, media pendingin, ST52, SMAWAbstrackIn the last few years, the development of technology in manufacturing has grown rapidly, one of which is the construction of heavy equipment. Excavator construction at the top is able to rotate (swing) 360º, where the boom part is one of the parts that do the swing and work hard because it lifts the load so that in the process of making the cylinder boom welding is carried out. One welding method that is mostly done is the welding process of SMAW (Shield Metal Arc Welding) which is also called Electric Arc Welding. This study aims to analyze the effect of cooling media variations on the results of tensile tests on the welding results of ST52 steel material. This research uses ST52 material. The material is given a single vee joint welding, where when finished welding the material is immersed in a used oil cooler, collant engine, and collant lathe for 30 minutes. After that the material is formed according to ASTM E8 / E8M-11 standards for tensile testing. The results showed that the tensile test results on specimens with used oil coolant media had the greatest tensile strength values of 48.3 Kgf / mm2 with a small elongation value of 6.4%, while the cooling media which produced the lowest value was in the collant lathe of 45.49 Kgf / mm2 with a large elongation value of 9.61%.Keywords: welding, tensile strength, cooling media, ST52, SMAW.

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