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All Journal Jurnal Teknologi Perikanan dan Kelautan ROTOR: JURNAL ILMIAH TEKNIK MESIN STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Wave: Jurnal Ilmiah Teknologi Maritim ComTech: Computer, Mathematics and Engineering Applications Abdi Dosen : Jurnal Pengabdian Pada Masyarakat J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin JURMA : Jurnal Program Mahasiswa Kreatif Journal of Mechanical Engineering, Science, and Innovation Journal of Fibers and Polymer Composites Jurnal Hasil Pengabdian Kepada Masyarakat Universitas Jember WAVE: Jurnal Ilmiah Teknologi Maritim
K.W., Robertoes Koekoeh
Mechanical Engineering Department, Faculty Of Engineering, Jember University, Indonesia
Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Public Health Social Sciences Transportation

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PENGARUH PENAMBAHAN SKEG TERHADAP OLAH GERAK DAN HAMBATAN KAPAL NELAYAN DI PELABUHAN PERIKANAN PUGER, JEMBER Hery Indria Dwi Puspita; Ahmad Yasim; Rudianto Rudianto; Robertoes Koekoeh Koentjoro Wibowo; Ramli Firdaus Kusnadi; Muhamad Arju Nabilul Akmal
Jurnal Teknologi Perikanan dan Kelautan Vol 14 No 2 (2023): NOVEMBER 2023
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24319/jtpk.14.169-179

Abstract

Kapal ikan merupakan kapal yang digunakan melakukan aktivitas penangkapan ikan, pengangkutan ikan, dan lain-lain. Kapal penangkap ikan di Puger memiliki ciri khas tersendiri yang mana memiliki bentuk lambung gemuk dan lebar. Hal ini bertujuan untuk meningkatkan kemampuan kapal dalam olah geraknya. Namun, akan berdampak pada besarnya resistance kapal. Sehingga diperlukan komponen sebagai peredam gerakan kapal tanpa membuat bentuk lambung kapal yang gemuk dan lebar. Penelitian ini bertujuan untuk mengetahui kemampuan kapal dalam kondisi perairan laut lepas terutama di Perairan Puger, sebagai landasan terkait uji karakteristik hidrodinamika pada kapal ikan di Perairan Puger dengan menambahkan komponen skeg guna meminimalisir terjadinya kecelakaan kapal oleng di masa yang akan datang. Obyek penelitian ini menggunakan model kapal yang sudah beroperasi dan kemudian dilakukan penggambaran ulang serta dimodifikasi dengan penambahan skeg yang selanjutnya dilakukan analisis hidrodinamika kapal diantaranya hambatan dan olah gerak kapal dengan menggunakan metode numerik. Sehingga diperoleh hasil hambatan dan olah gerak kapal dari pengembangan variasi lambung kapal ikan yang lebih baik 86-98% daripada tanpa menggunakan skeg. Penggunaan skeg terhadap karakteristik hambatan dan olah gerak kapal yang lebih baik yang sesuai dengan wilayah Perairan Puger.
Injection System Cultiving Machine for Plant Soybean in Panduman Village, Jelbuk District, Jember District Robertoes Koekoeh Koentjoro Wibowo; Widjonarko Widjonarko; Dwi Djumhariyanto
Jurma : Jurnal Program Mahasiswa Kreatif Vol 7 No 2 (2023): DESEMBER 2023
Publisher : LPPM UIKA Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/jurma.v7i2.1969

Abstract

This low soybean production is caused by various factors, including farming technology that is still not good, the readiness and skills of soybean farmers are still lacking, The current conventional/traditional system used by farmers to grow soybeans is to make holes with a small hole or wood. After that put 2-3 soybean seeds in each hole and then cover it with soil, this kind of activity takes a long time, causing discomfort for farmers or farm workers. The target of this activity is farmers by encouraging them planting soybeans in Panduman Village which is still possible from a geographical point of view and directing profit-oriented farming in an effective planting time process. In the planting activity, the design prototype planted soybeans in 2 planting rows with a working capacity of ≤ 18 hours/ha with a seed output of 2-3 seeds/planting hole and a planting depth of 3-5 cm and regular spacing of 40 cm and the seeds were covered with soil cover. The design of the development of this planting machine is considered quite good in planting soybeans.
ANALISIS KEKASARAN PERMUKAAN PADA PROSES PENGEBORAN ALUMINIUM 6061 Jannah, Betriqil; Sanata, Andi; Koekoeh KW, Robertoes; Junus, Salahuddin; Ramadhan, M Edoward; Sutjahjono, Hary
STATOR: Jurnal Ilmiah Teknik Mesin Vol 6 No 2 (2023): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Abstract

This research aims to determine the influence of spindle speed, tool diameter, and coolant on the surface roughness in the process of drilling Aluminum 6061 and identify the most optimal variable. Surface roughness is significantly affected by the spindle speed variable, which contributes to 46,47% of the outcome. The coolant variable contributes 31,17%, while the tool diameter variable has the smallest percentage contribution of 9,61%. The process variables for spindle speed (535 Rpm, 865 Rpm, 1520 Rpm) resulted in surface roughness values of (1,467 μm, 1,349 μm, 2,079 μm) respectively. For the tool diameter variable (8 mm, 10 mm, 12 mm), the surface roughness values were (1,765 μm, 1,701 μm, 1,429 μm) respectively. Regarding the coolant variable (water, dromus, oil), the surface roughness values were ((1,995 μm, 1,387 μm, 1,541 μm) respectively. The most optimal surface roughness was achieved with a spindle speed of 865 Rpm, resulting in a surface roughness value of 1.349 μm. Similarly, a tool diameter of 12 mm resulted in a surface roughness value of 1.429 μm, and the use of dromus as a coolant resulted in a surface roughness value of 1.387 μm. Keywords: Surface Roughness, Drilling, Aluminum 6061
PENGARUH RANGKAIAN SEL PELTIER TERHADAP KINERJA MINI REFRIGERATOR PORTABLE Firmansyah, Gilang; KW, Robertoes Koekoeh; Ilminafik, Nasrul; listyadi S, Digdo; Sholahuddin, Imam
STATOR: Jurnal Ilmiah Teknik Mesin Vol 7 No 1 (2024): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Abstract

Thermoelectric Cooler (TEC) / Peltier cooler box requires DC electric current in operation, so that it can be used as a tool to store portable vaccines that are useful in areas that do not have AC electricity flow. The research method uses experimental methods by making the previous research as a reference for conducting experiments with series variations on TEC. This study uses 2 TECs with a series of series and parallel TEC circuits on polyurethane cooler boxes 5,5 L (280 x 180 x 200) mm, power supplied to series and parallel TEC circuits of 20 W, 30 W, and 40 W while taking data is carried out for 60 minutes. The purpose of the study was to determine the effect of TEC cooling on the cooler, COP value, and efficiency on the system. The cooling capability of the TEC in the cooler shows the temperature in the cooler with the variation of the TEC parallel circuit lower than the series TEC. Calculation of the COP value shows the greater power given to the TEC, the COP value will be smaller, the COP value of the parallel circuit at minute 1 - 3 minutes is smaller than the series TEC, but in the 60th minute the difference in COP value between TEC series and The parallel circuit TEC is not too large. Calculation of cooling box efficiency with vaccine loading shows the highest efficiency is a parallel circuit TEC of 25,84% with input power in a 20 W system and a cooling load of 5,17 W, while the lowest efficiency is a series circuit TEC of 13,48% with input power 40 W and cooling load of 5,39W.
DESAIN MESIN ROL PELAT UNTUK MEMBANTU MASYARAKAT DI DESA WIROLEGI KABUPATEN JEMBER, JAWA TIMUR robertoes koekoeh koentjoro wibowo; siswoyo soekarno
Jurnal Hasil Pengabdian kepada Masyarakat Universitas Jember Vol 1 No 1 (2022): Jurnal Hasil Pengabdian Kepada Masyarakat Universitas Jember
Publisher : LP2M Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jpmunej.v1i1.37

Abstract

Bengkel teknik BAHARI JAYA TEKNIK merupakan bengkel kategori Usaha Kecil Menengah (UKM) yang berlokasi di Jalan Sritanjung Desa Wirolegi Kecamatan Sumbersari Kabupaten Jember, Jawa Timur. Bengkel ini bergerak dalam usaha pembuatan pagar rumah, pembuatan kanopi, pembuatan dan perbaikan alat-alat sederhana. Saat ini pesanan pada bengkel teknik Bahari Jaya Teknik cenderung meningkat dari tahun ke tahun. Banyak diantaranya adalah pesanan dalam membuat profil yang memerlukan proses pengerolan. Permasalahan utama bagi bengkel teknik Bahari Jaya Teknik adalah tidak tersedianya alat rolling pelat tersebut sehingga perlu adanya  alat rolling pelat. Tujuan dari pengabdian masyarakat ini adalah terpenuhinya peralatan mesin rolling pelat untuk bengkel teknik ini untuk membantu melakukan proses manufakturing roll pelat. Sehingga membuat pekerjaan di bengkel teknik ini menjadi lebih efektif dan efisien. Untuk membantu memecahkan masalah di Bengkel Teknik Bahari Jaya Teknik maka Program Kemitraan Masyarakat (PKM) di Desa Wirolegi, Kecamatan Sumbersari, Kabupaten Jember mendesain dan membuat alat pengerol (rolling) pelat. Pada Program Kemitraan Masyarakat (PKM), dalam memecahkan masalah yang ada pada mitra, telah dilakukan studi literatur untuk membuat model mesi roll dengan gambar teknik. Dasar-dasar pemilihan perancangan elemen mesin dipilih berdasarkan teori dari perancangan elemen mesin. Alat ini sangat membantu bengkel yang menggunakan.
Heat Treatment and Its Effect on Tensile Strength of Fused Deposition Modeling 3D-Printed Titanium-Polylactic Acid (PLA) Darsin, Mahros; Susanti, Rizqa Putri; Sumarji, Sumarji; Ramadhan, Mochamad Edoward; Sidartawan, Robertus; Yudistiro, Danang; Basuki, Hari Arbiantara; Wibowo, Robertoes Koekoeh Koentjoro; Djumhariyanto, Dwi
ComTech: Computer, Mathematics and Engineering Applications Vol. 15 No. 2 (2024): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v15i2.11255

Abstract

Titanium is a biocompatible metal commonly applied in biomedical fields such as bone and dental implants. Recently, the produced titanium-Polylactic Acid (PLA) filament for 3D printing Fused Deposition Modeling (FDM) technique is easier to operate and affordable. This filament contains less than 20% PLA, which is also biocompatible but hydrophobic and capable of producing inflammation of the surrounding artificial living tissue. Therefore, a heat treatment is needed to reduce or even eliminate PLA. The research aimed to optimize the mechanical properties and biocompatibility of titanium-PLA filaments through heat treatment, demonstrating significant advancements in 3D printing applications for biocompatible materials. A Thermogravimetric Analysis (TGA) was carried out to find out the right temperature for reducing PLA levels. Specimens were heat treated with four temperatures at 100oC, 160oC, 190oC, and 543oC, and two holding times of 60 and 120 minutes. The mass of the specimens was weighed before and after heat treatment to determine the mass reduction and tested for tensile, micrograph, and fractography observation. The result is a meagre mass reduction. The highest tensile strength of the heat-treated specimen with a heat treatment temperature of 160oC and a holding time of 60 minutes is 18.310 MPa. However, it is still below the strength of the non-heat treated specimen, 19.890 MPa. Specimens with low tensile strength have a microstructure that shows an uneven distribution of titanium particles. Last, fractography shows porosity in the specimens with the lowest tensile strength.
PENGARUH SUDUT DEFLEKSI GEAR TAB ELEVATOR TERHADAP STICK FORCE PILOT PADA PESAWAT N-219 Pribadi, Dicki Hendri; Koekoeh KW, Robertoes; ., Sumarji; Syuhri, Ahmad; Rudi Sugara, Imam
STATOR: Jurnal Ilmiah Teknik Mesin Vol 7 No 2 (2024): JURNAL STATOR
Publisher : Jurusan Teknik Mesin

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Abstract

Indonesia geographically is an archipelagic state that has been recognized by international community according to the PBB law of the sea then was ratified by Indonesia into UUD No.17 of 1985. The number of island in Indonesia currently according to BPS is 17.504 island, that makes Indonesia become the largest archipelagic country in the world and make potentially to have pioneer of aircraft. N-219 Aircraft produced by PT.Dirgantara Indonesia is a pioneer of aircraft that has been developed in Indoensia. Aircraft must meet the flight feasibility criteria to ensure flight safety. One of criteria is the value of a stick force pilot (FE), the force that the pilot receives to control the control surface of an aircraft. Regulation value of the stick force pilot reference is Civil Aviation Safety Regulation (CASR) part 23. The method used in this study is modelling the equations of the motion of the control surface balance tab with the elevator. This study seeks to find the optimum equation to meet the CASR23 regulation where the value of the stick force (FE) is ≤ 75 lbs. The result showed the optimum stick force pilot (FE) value in this modelling is equation III . In critical flight conditions the deflection of the balance tab is not enough to meet the design criteria, trim tab deflection (ẟtrim = 0 – 5˚) is used to reduce stick force pilot value and meets CASR23 regulation. In SLS condition all equation modelling meets the design criteria, where the maximum value stick force pilot (FE) is 51 lbs. keyword : stick force pilot, hinge moment, balance tab, trim tab, elevator.
Mechanical Characteristics of Stearic Acid Addition in Polylactic Acid (PLA) and Cassava Starch Bioplastic Blends Yusuf, Muhammad; Fatah, Ghaibi Alimul; Wibowo, Robertoes Koekoeh Koentjoro; Pradiza, Revvan Rifada; Ilyas, Rushdan Ahmad; Asrofi, Mochamad
Journal of Fibers and Polymer Composites Vol. 4 No. 2 (2025): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jfpc.v4i2.264

Abstract

This study aims to determine the effect of adding stearic acid (SA) to a bioplastic mixture of cassava starch (CS) and polylactic acid (PLA). The bioplastic was produced using a solvent casting method. The addition of SA can affect the mechanical properties of the film. The maximum tensile strength of the film increased from 5.12 MPa (without SA) to 7.61 MPa (5% SA). The same trend also applies to the Young's modulus and elongation at break, which increased from 25.45 MPa and 20.17% to 35.02 MPa and 21.64% after the addition of 5% SA. This improvement in mechanical properties is supported by the compatibility of PLA and CS due to the optimal presence of SA. These findings prove that SA is an effective compatibilizer in improving the mechanical properties of PLA and CS-based bioplastics. The resulting film products have the potential to be used as environmentally friendly packaging materials that are competitive with synthetic materials such as Low-Density Polyethylene (LDPE) and Ethylene Vinyl Acetate (EVA).
DUAL-FUNCTION COFFEE SKIN PEELING MACHINE TO IMPROVE THE WELFARE OF SUMBERCANDIK COFFEE FARMERS JELBUK JEMBER Darsin, Mahros; Djumhariyanto, Dwi; Wibowo, Robertoes Koekoeh Koentjoro; Basuki, Hari Arbiantara; Danang Yudistiro, Danang Yudistiro; Lindriati, Triana
Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Vol. 8 No. 1 (2024): MARET
Publisher : LPPM Univ. Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/abdidos.v8i1.2266

Abstract

Panduman Village, Jelbuk Jember District, is a fostered village by the University of Jember. Sumbercandik is one of the hamlets in Panduman Village with a geography of mountain slopes and hills and at an altitude that is very supportive for coffee farming/plantations. It is no wonder that the best coffee products are produced from this village. Ironically, the lives of many coffee farmers still fall into the pre-prosperous group. One of the reasons is that farmers sell coffee logs or wet-skinned coffee at relatively low prices. At the same time, factory-made chemical fertilizers have skyrocketed in price, and availability is strict. Various efforts have been made by the local government and other service teams related to these coffee farmers, but they have not touched those in Sumbercandik Hamlet. This community service seeks to uplift the economy of Panduman Village, especially the coffee farmers of Sumbercandik Hamlet, with the introduction of post-harvest coffee technology, utilization of coffee waste for fertilizer and briquettes, and management and cooperatives. This grant ceiling will carry out the proposal in three years. The first year was with the introduction of post-harvest technology in the form of wet and dry skin stripping (horn skin). In the second year, intensive drying techniques using technical and thermal methods. In addition, farmer group formation and simple production management. Year three, post-harvest waste processing technology. The first year's focus was on providing a coffee skin peeling machine. Each year will involve different lecturers with agricultural, management and cultural competencies. This activity is in line with the 2021-2025 RIPP of the University of Jember with the featured topic "Development of people's coffee towards an organic system to improve community welfare".
SUSTAINABLE FARMING THROUGH COMMUNITY EFFORTS: THE IMPACT OF ORGANIC COMPOSTING IN KUWON VILLAGE, MAGETAN REGENCY, INDONESIA Darsin, Mahros; Basuki, Hari Arbiantara; Djumhariyanto, Dwi; Yudistiro, Danang; Wibowo, Robertoes Koekoeh Koentjoro; Elhamzah, Denaldy Elza Setya; Yahya, Hafiz Indratma; Rossy, Rio Martha Febriana; Salmansyah, Dathantara; Rizal, Ahmad Ayyub Syaiful
Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Vol. 9 No. 1 (2025): MARET
Publisher : LPPM Univ. Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/abdidos.v9i1.2566

Abstract

This paper presents a community engagement initiative in Kuwon Village, Magetan Regency, aimed at enhancing agricultural productivity through compost production mechanization. The project, a collaboration between university researchers and local farmers, introduced organic composting techniques using a specially designed compost chopper machine. The initiative sought to address the challenges of high fertilizer costs and limited subsidized fertilizers, promoting sustainable agricultural practices and improving farmers' livelihoods. The primary goal was to provide an efficient, cost-effective method for producing organic compost, reducing dependency on chemical fertilizers, and improving soil health. The project followed a participatory approach, involving farmers at every stage—from needs assessment to design, fabrication, training, and implementation—ensuring solutions suited to the local community's needs. The compost chopper machine reduced time and labor in compost production, and farmers reported improved soil health and higher crop yields. The project also fostered community collaboration as farmers worked together to adopt new practices. Economic benefits included lower input costs and increased income from higher productivity. The success of this initiative highlights the potential of combining technological innovation with community involvement to tackle challenges faced by rural farmers in Indonesia, promoting sustainable agricultural development and improving livelihoods.
Co-Authors ., Sumarji Achmad Murdiono Agung Cahyo Rahardo Ahmad Adib Rosyadi Ahmad Syuhri Anam, Khairul Andi Sanata Danang Yudistiro Danang Yudistito Dedi Dwilaksana Deni Yudas Priawan Digdo Listyadi, Digdo Dwi Djumhariyanto Dwi Djumhariyanto Elhamzah, Denaldy Elza Setya Fatah, Ghaibi Alimul Fikril Hilmi FX Kristianta Ghozian Hilmi M Gilang Firmansyah, Gilang Hafidz Ahmad Abdillah Hari Arbiantara Basuki Hary Sutjahjono Ilminafik, Nasrul Ilyas, Rushdan Ahmad Imam Sholahuddin Indria Dwi Puspita, Hery Jannah, Betriqil Kristianta, Franciscus Xaverius Kristianta, FX Kusnindar Priohutomo Kusnindar Priohutomo M Asrofi M Edoward Ramadhan M. Katibi Vanhas Mahros Darsin Mochamad Asrofi Mochamad Edoward Ramadhan Moh. Nurkoyim Kustanto Muhamad Arju Nabilul Akmal Muhamad Zaky Rizqullah Nurrosidi Muhammad Maulana Andi Surya Muhammad Yusuf Nasrul Ilminnafik Novel Bagas Satrio Wibowo Pradiza, Revvan Rifada Pribadi, Dicki Hendri Rahardo, Agung Cahyo Rahma Rei Sakura Ramadhan, M Edoward Ramli Firdaus Kusnadi Rika Dwiqoryah Rizal, Ahmad Ayyub Syaiful Robertus Sidartawan Rossy, Rio Martha Febriana Rudi Sugara, Imam Rudianto Salahuddin Junus Salmansyah, Dathantara siswoyo soekarno Sumarji Susanti, Rizqa Putri Syahriza, Mochamad Rifki Thatit Widya A.P Triana Lindriati Trifiananto, Muhammad Widjonarko Yahya, Hafiz Indratma Yasim, Ahmad Yuni Hermawan