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All Journal Jurnal Rekayasa Mesin Jurnal Energi Dan Manufaktur Jurnal technoscientia ROTOR: JURNAL ILMIAH TEKNIK MESIN Media Mesin: Majalah Teknik Mesin Jurnal Elemen J-Dinamika: Jurnal Pengabdian Kepada Masyarakat Jurnal Ilmiah Teknik Mesin "MEKANIK" International Journal of Applied Sciences and Smart Technologies Jurnal Teknologi dan Riset Terapan (JATRA) JURNAL TEKNOLOGI TECHNOSCIENTIA
IGNB. Catrawedarma
Mechanical Engineering, Politeknik Negeri Banyuwangi
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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TEKNOLOGI PENGERING PADI UNTUK KETAHANAN PANGAN DI DESA WRINGIN PUTIH, BANYUWANGI IGNB. Catrawedarma; Zulis Erwanto; Danang Sudarso WPJW; Akhmad Afandi
J-Dinamika : Jurnal Pengabdian Masyarakat Vol 2 No 2 (2017): Desember
Publisher : Politeknik Negeri Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25047/j-dinamika.v2i2.567

Abstract

Desa Wringin Putih merupakan salah satu desa di Kabupaten Banyuwangi yang mengalami permasalahan dalam penanganan pasca panen padi. Selama ini penanganan yang dilakukan adalah dengan mengeringkan padi dibawah sinar matahari, cara ini terkendala disaat musim hujan, sehingga tidak bisa melakukan pengeringan. Jika proses ini terlambat, maka mengganggu tingkat kestabilan produktivitas beras dan pasokan beras ke masyarakat menjadi terlambat sehingga pada akhirnya mengganggu ketahanan pangan. Pengering dengan konsep natural convection menjadi salah satu solusi untuk membantu petani dalam meningkatkan nilai jual gabahnya. Pada prinsipnya pengering ini akan mengurangi kadar air secara perlahan-lahan karena udara panas secara alami mengalir kedalam ruang pengering tanpa bantuan blower mirip dengan pengering sinar matahari tetapi tidak perlu ruang yang luas, disamping itu kontaminasi oleh debu dan kotoran dapat dihindari. Berdasarkan hasil sosialisasi dan workshop alat pengering yang dilakukan di desa Wringin Putih didapatkan bahwa penerapan teknologi pengering sangat membantu petani dalam penanganan pasca panen khusunya dimusim hujan. Prototipe alat pengering ini dirancang dengan konsep yang sederhana untuk dapat dibuat dalam skala rumah tangga. Bed pengeringnya dengan diameter 60 cm dan lebar 30 cm, serta menggunakan motor listrik dengan daya 1 HP. Diharapkan dengan adanya penerapan teknologi pengering ini dapat membantu penanganan pasca panen dari petani di desa wringin putih. Keywords— Padi, Natural Convection Dryer
PELATIHAN PEMBUATAN PRODUK BERBAHAN DASAR SUSU SAPI DI DESA BALUNG LOR JEMBER M. Abdul Wahid; Mustofa Hilmi; Anis Usfah Prastujati; IGNB. Catrawedarma; Zulis Erwanto; Dian Ridlo; Sari Wiji Utami
J-Dinamika : Jurnal Pengabdian Masyarakat Vol 3 No 1 (2018): Juni
Publisher : Politeknik Negeri Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25047/j-dinamika.v3i1.669

Abstract

Balung Lor merupakan desa di Kecamatan Balung Kabupaten Jember mengalami permasalahan dalam penanganan susu sapi. Penanganan yang dilakukan selama ini belum ada sehingga berdampak pada menurunnya kualitas susu sapi menyebabkan penurunan ekonomi dan mengalami kerugian. Fermentasi merupakan solusi dalam penanganan  susu sapi menjadi bernilai jual dengan membuat produk baru yaitu yoghurt. Yogurt dibuat dengan proses fermentasi antara susu segar dan bakteri asam laktat (BAL) yang dapat meningkatkan kandungan gizi dan dapat digunakan sebagai memacu pertumbuhan karena meningkatkan pencernaan dan penyerapan zat gizi, mengurangi atau membunuh bakteri jahat dalam saluran pencernaan, menormalkan kerja usus besar (mengatasi konstipasi dan diare), memiliki efek anti kanker, mengatasi masalah lactose intolerance, berperan dalam detoksifikasi dan mengatasi stres, serta mengontrol kadar kolesterol dalam darah dan tekanan darah. Berdasarkan hasil sosialisasi dan pelatihan pengolahan susu sapi menjadi yogurt. Kegiatan ini bertujuan bertujuan membantu memecahkan permasalahan yang dihadapi oleh peternak untuk meningkatkan ekonomi dengan mengaplikasikan teknologi fermentasi yogurt berbahan dasar susu sapi sebagai wujud ketahanan pangan nasional khususnya kelompok Ternak Mandiri Sejahtera di Desa Balung Lor Kecamatan Balung Kabupaten Jember.kegiatan ini dilakukan dengan dua tahapan yaitu sosialisasi dan pelatihan demontrasi pembuatan yoghurt. Hasil kegiatan ini menunjukan respon peserta cukup baik dan kegiatan pelatihan pengolahan susu sapi menjadi yogurt merupakan informasi baru bagi peserta (peternak). Penerapan keterampilan pembuatan produk yogurt juga mungkin dilakukan oleh para peserta karena alat dan bahan yang digunakan relatif mudah ditemukan dilingkungan tempat tinggal mereka. Sehingga pengolahan susu sapi menjadi yogurt berpotensi menjadi salah satu alternatif yang dapat dijadikan sebagai usaha keluarga.
Analisis Manajemen Termal LiFePO4 (Lithium Iron Phosphate) dengan Pendinginan Bubble Generator dan Tanpa Bubble Generator Ilmi Maulana, Muhammad; Catrawedarma, IGNB.; Novita Sari, Eli; Satria Prasetya DY, IGNA; Ridlo Pamuji, Dian
Jurnal Rekayasa Mesin Vol. 24 No. 2 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i2.554

Abstract

Lithium Iron Phosphate (LiFePO4) batteries are known for their long life, low self-discharge rate, and stable performance. However, LiFePO4 batteries are prone to thermal problems when operating outside the optimal temperature range of 25-40°C [12], which can threaten the performance, safety, and lifetime of the battery. Previous research has shown cooling systems to be a solution to these thermal issues. However, the use of an internal cooling system risks changing the voltage and causing the battery to overheat. Therefore, an approach using an external cooling system is recommended to maintain the performance of Li-ion batteries without changing their internal components. In an effort to improve the thermal management of LiFePO4 batteries, this study proposes to analyze the use of cooling with bubble generator and without bubble generator. The bubble generator here is intended to increase the random movement of water in the cooling system so that heat absorption becomes more optimal. This study uses a circulating cooling system with water pump media, airator, bubble generator and cooling using water, for the flow container that circulates in the battery cells we use acrilyc mica. The results of the influence of variations in bubble generator testing average temperature values on LiFePO4 batteries of 16.26ºC to 23.94ºC. and the influence of variations in testing without bubble generators average temperature values on LiFePO4 batteries of 17.62ºC to 25.57ºC, From this study it can be concluded that the bubble generator is able to cool 90% of the operational temperature 25-40 °C.
Studi Eksperimental Pemisah Minyak-Air Menggunakan Hidrosiklon-Bubble Generator berdasarkan Variasi Diameter Underflow Rimbita, Trismi; Catrawedarma, IGNB.; Novita Sari, Eli; Wahid, M. Abdul; Fiveriati, Anggra
Jurnal Rekayasa Mesin Vol. 24 No. 2 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i2.555

Abstract

Oil and water are two liquids that are often usedby both the public and industrial companies. Mixing oil and water need to be separated in various industries such as waste processimg, oil and gas production, and other industrial processes. Hydrocyclone is a separation method with the principle of sparation based on specific gravity which utilizes centrifugal fore by adding a bubble generator to the input section and adding variations in the underflow diameter. This research aims to analyze the performance of a hydrocyclone bubble generator based on underflow variations as oil-water separation. This bubble generator is used to make it easier to suck in air. The variations in underflow diameter used are 10mm, 15mm and 20mm. This research was carried out inject a mixture of oil and water into a hydrocyclone system as a sparation medium. The air flow injeted into the bubble generator uses air flow variations of 0.1, 0.6 and 1.2 lpm (liters/minute). From the research that has been carried out, the results show that the larger the underflow opening, the greater the pressure in the underflow, so that the underflow pressure drop is greater. The smaller the underflow opening, the greater the overflow pressure, so the overflow pressure drop is greater. The greater the input air flow, the greater the difference in underflow and overflow pressure drop. The smaller the valve opening, the lower the efficiency of oil separation in overflow and the greater the efficiency in underflow. The highest efficiency results on overflow are 88.6%.
Bubble flow configurations generated by ejector type bubble generator Catrawedarma, I Gusti Ngurah Bagus; Ton, Sefri; Pranowo, Dadang Dwi; Surahmanto, Fredy; Astyanto, Achilleus Hermawan
International Journal of Applied Sciences and Smart Technologies Volume 07, Issue 1, June 2025
Publisher : Universitas Sanata Dharma

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24071/ijasst.v7i1.10816

Abstract

Bubble flow configurations generated by an ejector bubble generator were captured using a high-speed video camera and extracted into several images. The air flow and nozzle diameter were varied during the test in ranges of 0.1-1.5 lpm and 1.17-3.5 mm, respectively. The results reveal that in general the bubble flow structure coming out from the bubble generator is divided into three regions, namely the entrance, bubble swarm, and bubble dispersed region. It is found that there is a higher time delay of bubble production when the air flow and the nozzle diameter decrease. On the other hand, the bubble production time is longer, if the air flow and the nozzle diameter increase.
ANALISA MOMEN PUNTIR POROS IMPELLER PADA SISTEM PROPULSI WATERJET KAPAL 6 METER DENGAN VARIASI BLADE IMPELLER MENGGUNAKAN METODE CFD Bagas Dwi Kurniawan; Jangka Rulianto; Achdri Fauzi Nugraha Oloan; I Gusti Ngurah Bagus Catrawedarma; Chairul Anam
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.9968

Abstract

Analysis of the impeller shaft torsion moment in the waterjet system with impeller blade variations aims to analyze the strength of the impeller shaft caused by the specified engine power. The engine used has a power of 6.5 hp and has an output power of 2000 Rpm. This study aims to determine the impeller shaft torsion moment with impeller blade variations using the Computational Fluid Dynamic (CFD) method. Using Aloy steel 4340 material which has a shaft diameter of 23 mm and a length of 700 mm. The torque value that appears in variation 1 with 3 impeller blades is 30.65 Nm, variation 2 with 4 impeller blades is 87.61 Nm and for variation 3 with 5 impeller blades is 33.07 Nm. In accordance with the results of the calculation of the torsion moment of 30.85 Nm, it is known that variation 1 with 3 impeller blades is said to meet the specified criteria to be applied to the waterjet system. Based on the results of the specified allowable stress of 60.89 Nm, it was found that for variations 1 and 3 with the number of impeller blades of 3 and 5 respectively, they have met the safe conditions for the impeller shaft torsion moment, by considering that variation 3 is adjusted to the results of the impeller shaft torsion moment calculation to determine the effectiveness for the specified waterjet system.
TECHNICAL ANALYSIS OF ADDING HOLES TO THE SKEG OF A TUGBOAT AND ITS EFFECTS ON FLOW AND RESISTANCE USING THE COMPUTATIONAL FLUID DYNAMICS METHOD David Prayogo; Abdul Rohman; Jangka Rulianto; Khairul Muzaka; I Gusti Ngurah Bagus Catrawedarma
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.10163

Abstract

Tugboats play a crucial role in supporting the safety and operational efficiency of ports and offshore activities. One of the key components in tugboat design is the skeg, which serves to enhance directional stability and reduce yawing effects. This study aims to analyze the influence of the number of holes in the skeg on the flow characteristics and resistance of a tugboat. Three skeg variations were tested: a skeg without holes, a skeg with two holes, and a skeg with four holes, under two speed conditions, namely 10 knots and 15 knots. The observed parameters include wetted surface area, drag force, and longitudinal flow velocity (velocity u). The simulation results indicate that the skeg without holes produced the lowest drag values, at 22.570 N at 10 knots and 138.430 N at 15 knots, along with a more stable and streamlined flow pattern. In contrast, adding holes to the skeg resulted in increased drag and flow disturbances in the form of vortices and fluid separation. Therefore, the skeg without holes is considered more hydro dynamically optimal for improving the operational efficiency of tugboats.  
Co-Authors Abd. Rasyid Syamsuri ABDUL ROHMAN Achdri Fauzi Nugraha Oloan Achilleus Hermawan Astyanto Afandi Akhmad Akhmad Afandi Anam Chairul Anggra, Fiveriati Anhar Riza Antariksawan Anis Usfah Prastujati Bagas Dwi Kurniawan Chairul Anam Danang Sudarso WPJW David Prayogo Dian Ridlo Fredy Surahmanto Halil Halil Ilmi Maulana, Muhammad Indarto - Indarto - Indarto Indarto Indarto Indarto Ismu Handoyo Jangka Rulianto Khairul Muzaka Kiswanta - Kiswanta Kiswanta, Kiswanta M. Abdul Wahid Mulya Juarsa Mustofa Hilmi Novita Sari, Eli Nuraini Lusi Pranowo, Dadang Dwi Ridlo Pamuji, Dian Rimbita, Trismi Ririn Fitriana Sari Wiji Utami Satria Prasetya DY, IGNA Ton, Sefri Wahid, M. Abdul Zulis Erwanto