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All Journal Rekayasa Mesin Info-Teknik JMM (Jurnal Masyarakat Mandiri) Jurnal Penelitian IPTEKS J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Jurnal Abdi Insani CENDEKIA : Jurnal Ilmu Pengetahuan Jurnal Penelitian Inovatif KNOWLEDGE: Jurnal Inovasi Hasil Penelitian dan Pengembangan Surya Teknika: Jurnal Ilmiah Teknik Mesin Journal of Applied Mechanical Engineering and Renewable Energy (JAMERE) Journal of Engineering Science and Technology National Multidisciplinary Sciences AutoMech : Jurnal Teknik Mesin International Applied Science Journal of Mechanical Engineering Jurnal Pengabdian Indonesia J-Proteksion : Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin
Kosjoko Kosjoko
Jurusan Teknik Mesin Fakultas Teknik Universitas Brawijaya
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PENGARUH VARIASI REGULATOR RECTIFIER (GIPROK) DAN AUTOMATIC VOLTAGE REGULATOR (AVR) TERHDAP VOLT DAN FREKUENSI PADA GENERATOR TENEGA DIESEL 16 HP Hawaij, Dedi Maulana; Kosjoko, Kosjoko; Mufarida, Nely Ana
AutoMech : Jurnal Teknik Mesin Vol. 2 No. 01 (2022): Mei
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/jtm.v2i01.4866

Abstract

Listrik yang setabil dan sesuai batas aman yang mana saat ini masih terjadi naik turunnya tegangan listrik di daerah daerah tertentu maka dibutuhkan alat alat penunjang seperti AVR singkatan dari Automatic Voltage Regulator, dimana komponen ini berfungsi untuk terus menjaga keseimbangan atau stabilitas voltase dan hz listrik dari sebuah generator atau genset ketika berhadapan dengan beban listrik yang kerap berubah-ubah. Untuk masyarakat pada umumnya, biasanya mengetahui bahwa tegangan listrik yang tidak stabil akan berdampak buruk pada berbagai perangkat elektronik atau listrik yang ada termasuk untuk perangkat genset sendri, sehingga diperlukan adanya komponen AVR ini. Alat yang berfungsi untuk mengatur tegangan listrik keluaran generator tersebut kita kenal dengan nama AVR. Arus AC adalah singkatan dari Alternating Current, yaitu Listrik arus bolak-balik. Dinamakan demikian karena listrik ini mempunyai bentuk gelombang sinusoidal. Artinya ialah listrik ini mempunyai polaritas yang berubah-ubah
Analisis Perbandingan Single Piston Dan Double Piston Terhadap Jarak Dan Waktu Pengereman Menggunakan Variasi Discbrake Pada Motor 125 Cc Octa, Hakim; Mufarida, Nely Ana; Kosjoko, Kosjoko
AutoMech : Jurnal Teknik Mesin Vol. 4 No. 02 (2024): Nopember
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/jtm.v4i02.9460

Abstract

Safety is a major factor in planning and designing road facilities. Various studies related to accident risk analysis have been carried out, but there are still not many practical applications, especially for accident risk analysis at priority intersections. The method used in this research is a data collection method using a braking test process using single piston and double piston with standard disc brake variations. and after market. This research is intended to compare the braking distance and time using a variation discbrake. The results of comparative testing of single piston and double piston using a standard discbrake and a variation discbrake show that the maximum discbrake performance is the variation discbrake because it has a lower average braking time and distance than the standard disc brake. On a single piston with a pressure of 2kg, the average travel distance was 0.27 m (11.53 m - 11.26 m) with a time of 0.39 s (2.75 s - 2.36 s). Meanwhile, with a double piston with a pressure of 2kg, the average distance traveled was 0.06 m (8.50 m - 8.44 m) with a time of 0.15 s (1.88 s - 1.73 s). Variations in single piston braking greatly influence the braking distance and time, an average of 0.27 m with a time of 0.39 s from the standard discbrake, and variations of the double piston discbrake have a distance and time of 0.06 m with a time of 0.15 s from the standard discbrake.
PERBANDINGAN EFEKTIVITAS STARTER EM4 DALAM PROSES PEMBUATAN BIOGAS DARI BATANG POHON PISANG DAN KOTORAN HEWAN TERNAK Gunawan, Arik; Abidin, Asroful; Kosjoko, Kosjoko
KNOWLEDGE: Jurnal Inovasi Hasil Penelitian dan Pengembangan Vol. 5 No. 2 (2025)
Publisher : Pusat Pengembangan Pendidikan dan Penelitian Indonesia (P4I)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51878/knowledge.v5i2.5779

Abstract

Indonesia's energy needs continue to increase every year while natural energy products are running low, for example energy products from fossils, such as coal, natural gas and oil. Transportation, business and electricity generation are the sectors that use the most energy so it can cause a scarcity of energy sources, one of which is natural gas which is used as cooking fuel, namely LPG for the community, for this reason a solution is being sought by using renewable energy sources, namely biogas. Biogas is a gas produced by microorganisms that decompose organic matter under rare anaerobic conditions or through the fermentation process of organic waste using a biodigester. In this research, the materials used were banana tree trunks, cow, goat dung and EM4 which were varied by 0%, 10%, 15% and 20% by testing the role of EM4 on biogas production which included pH, gas volume, gas composition and flame quality. The results of this research are that the pH variation of EM4 15% is considered ideal, namely 6.5 – 7.0, for the highest gas volume, namely 6801.60 cm3, has a gas composition of Oxygen (O2) 6.0%, Hydrogen Sulfide (H_2 S) 379 ppm, Carbon Dioxide (CO_2) 1 ppm, Methane (CH_4) 665 ppm and the flame quality is blue. ABSTRAKKebutuhan energi Indonesia terus meningkat setiap tahunnya sementara hasil energi alam semakin menipis, contoh hasil energi dari fosil, seperti batu bara, gas bumi, dan minyak. Transportasi, bisnis, dan pembangkit listrik adalah sektor yang paling banyak menggunakan energi sehingga dapat menyebabkan kelangkaan seumber energi salah satunya gas bumi yang digunakan sebagai bahan bakar memasak yaitu LPG bagi masayarakat, untuk itu dicarikan solusi dengan menggunakan sumber energi yang dapat diperbaruhi yaitu biogas. Biogas adalah gas yang dihasilkan oleh mikroorganisme yang mengurai bahan organik pada kondisi anaerob yang langka atau melalui proses fermentasi limbah organik menggunakan biodigester. Pada penelitian ini bahan yang digunakan yaitu batang pohon pisang, kotoran sapi, kambing dan EM4 yang divariasikan 0%,10%,15% dan 20% dengan menguji peran EM4 terhadap produksi biogas yang meliputi pH, volume gas, komposisi gas dan kualitas nyala api. Hasil penelitian ini yaitu pada pH variasi EM4 15% tergolong ideal yaitu 6.5 – 7.0, untuk volume gas tertinggi yaitu 6801.60 cm3, memiliki komposisi gas Oksigen ( O2 ) 6,0%, Hydrogen Sulfida ( ) 379 ppm, Karbon Dioksida ( ) 1 ppm, Methana ( ) 665 ppm dan kualitas nyala api bewarna biru.
Pengaruh Variasi Bentuk Kampuh Las TIG (Tungsten Inert Gas) Terhadap Uji Tarik dan Struktur Mikro Pada Material Plat Stainless Steel 201 Pratama, Mokhammad Yoga; Mufarida, Nely Ana; Kosjoko, Kosjoko
Journal of Engineering Science and Technology Vol. 1 No. 3 (2023): September
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v1i3.19

Abstract

Welding technology has an integral role in the manufacturing technology domain. To create high-quality structures requires technology that allows joining metals. It is in this phase that welding technology comes into play. TIG (Tungsten Inert Gas) welding is a form of tungsten gas arc welding, where the electrode acts as an arc supplier that does not melt during the welding process. The Gas Tungsten Acr Welding technique is generally used more on light metals such as magnesium, aluminum, and stainless steel, and other types of metal. This type 201 carbon steel has several mechanical characteristics, including a tensile strength of 580 Mpa, an elastic limit (yield strength) of 198 Mpa, an elongation rate of 50%, and a hardness of 87 HRBI. The aim of this research is to determine the tensile strength and microstructure of TIG (Tungsten Inert Gas) welding results with 45 degrees of V, U and J seams. This research was carried out with several flat 2D test models of 45 degrees of V, U and J seams with current. 110 - 120. This research was conducted at the Banyuwangi Job Training Center, in the Materials Laboratory for Mechanical Engineering at Sebelas Maret University, Surakarta and at the Mechanical Engineering Laboratory at Jember State University. In this research, the results of changes in tensile strength were quite significant. The lowest tensile strength value is found in the J weld seam with an average value of 394.4 MPA. Meanwhile, the highest tensile strength value is found in the V weld seam with an average value of 531.1 MPA. The results of the microstructure for J seam have the largest phase grains and V seam forms the smallest phase grains compared to the others. Kampuh V has quite a large number of grains because they are relatively small and dense.
Pengaruh Variasi Arus Las SMAW Terhadap Uji Tarik dan Uji Kekerasan Serta Struktur Mikro Pada Bahan ST 37 Surahman, Andika; Mufarida, Nely Ana; Kosjoko, Kosjoko
Journal of Engineering Science and Technology Vol. 1 No. 3 (2023): September
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v1i3.21

Abstract

This research aims to determine the effect of variations in welding currents of 90A, 100A, and 110A on SMAW bases on the material in the tensile, hardness, and microstructure tests. This research uses ST37 low carbon steel and uses E6013 electrodes with a diameter of 3.2 mm, followed by making specimens for testing. After that, the welding process is carried out and then testing continues. In the test, the following results were obtained: The strength value of the welded material with tensile testing was obtained with the highest results at a current variation of 110A with Yp 27.33 Mpa, Max 36.47 Mpa, Break 31.08 Mpa. Because the highest pearlite microstructure value is obtained in the 110A variation. And the lowest value occurred in the welded material of variation 90A with Yp 25.48 Mpa, Max 26.86 Mpa, Break 12.33 Mpa. Because the lowest pearlite microstructure value is obtained in the 90A variation. while the comparison of the level of hardness in ST 37 carbon steel with varying welding currents ranging from 90A, 100A, and 110A has an average hardness value of 168 VHN for welding with a current of 90A for welding with a current of 100A the average hardness value is 177 VHN and finally in welding current 110A the average hardness value is 191 VHN. The hardness level of the ST 37 carbon steel specimen was the highest at a welding current of 110A, with a tensile strength test result of 36.47 MPa. And from the results of observing photos of the microstructure using the point count method, the highest percentage of pearlite was in the welding material variation 110A so the tensile strength value was higher.
Pengaruh Variasi Arus Pada Pengelasan SMAW Terhadap Uji Kekuatan Bending dan Struktur Micro Baja ST 42 Mabrullah, Riki Alan; Kosjoko, Kosjoko; Shofiyah, Rohimatush
Journal of Engineering Science and Technology Vol. 2 No. 2 (2024): May
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v2i2.24

Abstract

This research aims to analyze the effect of variations in welding current on the mechanical strength of ST 42 steel using the SMAW welding method and E6013 electrodes with a diameter of 3.2 mm. The variations in welding current used are 90A, 100A and 110A. The tensile test results show that a welding current of 110A produces the highest tensile test value with a yield point (YP) of 8,368 MPa, maximum stress (MAX) of 9,890 MPa, and break point (BREAK) of 5,283 MPa. Bending tests indicate that a welding current of 110A produces the highest bending strength of 10.118 MPa. Microstructural observations revealed that the highest percentage of pearlite was present in welding with a current of 110A, which contributed to an increase in the tensile strength of the material. From the results of this research, it can be concluded that the increase in welding current is directly proportional to the increase in the mechanical strength of ST 42 steel
PENINGKATAN KEMAMPUAN ANALISIS FUNDAMENTAL SEBAGAI DASAR INVESTASI BAGI AKTIVIS IMM JEMBER Satoto, Eko Budi; Kosjoko, Kosjoko
JMM (Jurnal Masyarakat Mandiri) Vol 9, No 1 (2025): Februari
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jmm.v9i1.28524

Abstract

Abstrak: Koordinasi yang dilakukan oleh Tim Pengabdian Universitas Muhammadiyah Jember dengan Aktivis IMM Cabang Jember disepakati akan diselesaikan masalah prioritas. Masalah prioritas tersebut diantaranya Aktivis IMM Cabang Jember belum belum memiliki keterampilan melakukan analisa fundamental dalam investasi saham. Solusi yang diberikan adalah memberikan bimbingan kepada Aktivis IMM Cabang Jember mengenai analisa fundamental dalam investasi saham. Tujuan dari kegiatan ini adalah Aktivis IMM Cabang Jember memiliki keterampilan melakukan analisa fundamental dalam investasi saham. Kegiatan pengabdian ini dilaksanakan dalam 5 (lima) tahapan pengabdian. Kelima tahapan pengabdian itu diantaranya pertama, Sosialisasi analisa fundamental dalam investasi saham. Kedua, pelatihan Analisa fundamental dalam investasi saham. Ketiga, penerapan analisa fundamental dalam investasi saham. Keempat, pendampingan dan evaluasi penerapan analisa fundamental dalam investasi saham. Kelima Keberlanjutan Program terdiri dari pembentukan Tim khusus analisa fundamental dalam investasi saham. Hasil pelaksanaan pengabdian menunjukkan bahwa kegiatan pengabdian kepada masyarakat ini telah mampu meningkatkan kemampuan aktivis Ikatan Mahasiswa Muhammadiyah Kabupaten Jember melakukan analisis fundamental saham. Hal ini dapat pula dilihat dari hasil evaluasi bahwa diawal kegiatan kemampuan peserta rata-rata sebesar 15,71 meningkat menjadi rata-rata sebesar 80.Abstract: Coordination carried out by the Muhammadiyah Jember University Service Team with Jember Branch IMM Activists agreed that priority problems would be resolved. The priority problems include IMM Jember Branch activists who do not yet have the skills to conduct fundamental analysis in stock investment. The solution provided is to provide guidance to Jember Branch IMM Activists regarding fundamental analysis in stock investment. The purpose of this activity is that Jember Branch IMM activists have the skills to conduct fundamental analysis in stock investment. This service activity is carried out in 5 (five) stages of service. The five stages of service include first, socialization of fundamental analysis in stock investment. Second, training in fundamental analysis in stock investment. Third, the application of fundamental analysis in stock investment. Fourth, assistance and evaluation of the application of fundamental analysis in stock investment. Fifth, Program Sustainability consists of the formation of a special team for fundamental analysis in stock investment. The results of the service implementation show that this community service activity has been able to improve the ability of activists of the Muhammadiyah Student Association of Jember Regency to conduct fundamental stock analysis. This can also be seen from the evaluation results that at the beginning of the activity the average participant's ability of 15.71 increased to an average of 80.
Co-Authors Abadi Sanosra Abdul Rohman Agus Surya S, M Amelia novinda sari Amri Gunasti Ana Mufarida, Nely Andre, Irham Andrean Asroful Abidin Bagus Dwi Kurniawan, Bagus Dwi Din’go Ega Prayitno, Rachmad Djoko Sutikno Eko Budi Satoto Fajar Santosa, Muhammad Felani, Fran Nur Fidhausi Alviyndin , Arta Abtian Finali, Asmar Gilang, Aditya Gunawan, Arik Hairul Bahri, Mokh. Hawaij, Dedi Maulana Hifni, Mada Naufal Irawan, Moh Iskandar Umarie Mabrullah, Riki Alan Mufarida, Nely Ana Muhammad Zainur Ridlo Muliyaddi, Muliyaddi Nely Ana , Mufarida Nurhalim Nurhalim, Nurhalim Nurlina, Ika Tyas Octa, Hakim Pratama, Mokhammad Yoga Prawitasari, Saptya Purnawan, Gilang Putra, Dhian Wahana Rachman, Rafly Aulia Ridho, Atok Ainur Romadhon, Muhammad Firly Shofiyah, Rohimatush Sonief, Achmad As'ad Surahman, Andika Syah, Moch. Thoriqur Rahman Toha, Kamil Totok Dwi Kuryanto Ulumudin, M Ikhya Wibowo, Bintang Yudhistira Adi