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All Journal Jurnal Rekayasa Mesin Jurnal Teknik Mesin Jurnal Pendidikan Teknik Mesin R.E.M (Rekyasa Energi Manufaktur) Jurnal Otopro Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Indonesian Journal of Engineering and Technology (INAJET) Madani: Multidisciplinary Scientific Journal Diversity Logic Journal Multidisciplinary Jurnal Ilmu Ekonomi, Pendidikan dan Teknik (IDENTIK) Jurnal Rekayasa Mesin Jurnal Ilmu Teknologi Informasi Indonesia (JITIFNA)
Firman Yasa Utama
Universitas Negeri Surabaya
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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RANCANG BANGUN MESIN PENCACAH RUMPUT GAJAH UNTUK PROSES PEMBUATAN SILASE PAKAN TERNAK SAPI Genta Arya Rahma Mahendra, Genta; Wulandari, Diah; Utama, Firman Yasa; Widoretno, Yustin Setiya
Jurnal Rekayasa Mesin Vol 11 No 01 (2026): JRM April 2026 (In Press)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jrm.v11i01.75196

Abstract

Silage is a method of providing cow feed that requires a forage chopping process so that it is easy to ferment and has a longer shelf life. However, most breeders still do the enumeration manually, so it takes a long time and the size of the enumeration is not uniform. Therefore, this study aims to design an elephant grass chopper with dual input and output funnels, equipped with a knife and a beater to speed up cutting and crush harder materials. This machine is expected to be able to produce a uniform size of 2–5 cm according to the SNI 7785.1:2003 standard This research method uses a 4D Research and Development (R&D) model to design and test a elephant grass chopper. The stages include literature review, design, machine construction and assembly, and then functional testing using elephant grass as the test material in three trials. The test data is analyzed to assess the machine's performance and feasibility. The results of the study show that the designed elephant grass chopper can operate well. Based on the function test at 1500 rpm with a test material load of 5 kg, the machine produces a chopping size of 2–5 cm with a working capacity of 92 kg/hour, so it is considered suitable for use to support the process of making silage for cattle feed and increase efficiency compared to manual methods.
The Effect of Air Pressure and Nozzle Distance on the Quality of Water-Based Painting Using a Gravity-Feed Spray Gun Mochammad Hildad Ajiban; Heru Arizal; Rachmad Syarifudin Hidayatullah; Firman Yasa Utama
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 6 Nomor 1 Tahun 2024
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v6i1.5187

Abstract

Environmental influences can cause corrosion or damage to materials, which is why paint coating is used to protect them. Some of the factors that affect the quality of the paint are technical, such as setting the air pressure and spray gun nozzle spacing. The experimental research aims to determine how air pressures of 1.5, 2, and 2.5 bar and nozzle spacings of 10–15–20 cm affect the gloss and thickness of the water-based paint layer. A gravity-feed spray gun was used for this purpose. The luster test method uses an AMTAST AMN60 glossmeter with the ASTM D523-08 standard, and the thickness test uses a coating thickness gauge with the ASTM E 376-96 standard. The air pressure and the distance of the spray gun nozzle affect the gloss and thickness of the paint layer. Parameter 2 bar/15 cm yielded the highest gloss of 92.77 GU, while parameter 2.5 bar/10 cm resulted in the highest coating thickness of 0.26 mm.
Penerapan Orientasi Komposit Serat Karbon Pada Poros Kemudi Sepeda Motor Menggunakan Metode Vacuum Infusion Terhadap Kekuatan Puntir Tyo Echa Feriandra; Firman Yasa Utama
Jurnal Ilmu Teknologi Informasi Indonesia Vol. 2 No. 2 (2026): JITIFNA - Juli
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/jitifna.v2i2.1785

Abstract

A motorcycle steering shaft is subjected to torsional loads during vehicle steering; therefore, it requires a lightweight material with adequate mechanical strength. This study aimed to analyze the effect of carbon fiber orientation on the torsional strength of hollow cylindrical composite specimens fabricated using the vacuum infusion method. The specimens were manufactured from 3K 240 gsm twill carbon fiber and epoxy resin with 11 layers and fiber orientation variations of 0°, 45°, and 90°. The specimen geometry was based on a 1:2 scale model of the Honda Vario 125 steering shaft, with an outer diameter of 16.5 mm, an inner diameter of 11 mm, and a total length of 200 mm. Static torsion testing was conducted, and the experimental data were processed to determine the maximum torque, maximum shear stress, and shear modulus. The results showed that the 45° fiber orientation provided the best torsional strength, with an average maximum torque of 35.31 N·m and an average maximum shear stress of 49.89 MPa. Therefore, the 45° fiber orientation produced the highest maximum torsional strength among the tested orientation variations under laboratory conditions.
Analisis Sudut Pisau Pada Mesin Pencacah Rumput Gajah Untuk Pembuatan Silase Pakan Ternak Sapi Muhammad Erlangga Adi Nugraha; Diah Wulandari; Firman Yasa Utama; Aji Nugroho
Jurnal Ilmu Ekonomi, Pendidikan dan Teknik Vol. 3 No. 1 (2026): IDENTIK - Januari
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/identik.v3i1.1285

Abstract

This study examines how the blade angle of an elephant grass chopping machine affects the chopping results used for making cattle feed silage. Elephant grass needs to be chopped to a standard size for silage production, with the ideal chop length ranging from 2–5 cm and relatively uniform, so that the fermentation process runs properly and the feed is easier for livestock to consume. The research was conducted using an experimental method with 1 kg of fresh elephant grass for each trial. The chopped output was classified into three size categories: <2 cm, 2–5 cm, and >5 cm, to determine which met the silage standard most effectively. The study tested three blade angles—30°, 45°, and 60°—and three machine rotational speeds (1700 rpm, 2000 rpm, and 2300 rpm) to evaluate their effects on chopping time, cut size distribution, and processing capacity. The results show that the best performance in terms of machine rotational speed at the 30° blade angle occurred at 2300 rpm. The highest percentage of chopped material within the 2–5 cm size range was obtained at a 45° blade angle, reaching approximately 55–58% of the total chopped output, indicating the most optimal conformity with silage size standards.
Perbandingan Variasi Matriks Resin Epoxy Dan Resin Polyester Pada Komposit Carbon Fiber Terhadap Kekuatan Uji Impak Dengan Standar ASTM D6110 Sahroni; Firman Yasa Utama
Jurnal Ilmu Ekonomi, Pendidikan dan Teknik Vol. 3 No. 3 (2026): IDENTIK - Mei
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/identik.v3i3.1459

Abstract

The development of automotive technology has increased the need for lightweight materials with high mechanical strength and good impact resistance. Motorcycle fenders commonly use conventional plastic materials such as Polypropylene (PP) and Acrylonitrile Butadiene Styrene (ABS), which have relatively low impact resistance, approximately 0.0605 J/mm² for impact value and 2.42 Joules for impact energy. Therefore, alternative materials with better mechanical properties are required. Carbon fiber composites are considered a promising alternative due to their lightweight characteristics, high strength, and excellent resistance to impact loads. This study aims to analyze the effect of epoxy and polyester resin matrix variations on the impact strength of carbon fiber composites based on ASTM D6110 standards. This research employed an experimental method using the vacuum infusion fabrication technique. The research stages included preparation of tools and materials, mold preparation, arrangement of 15 layers of carbon fiber, resin infusion, curing process, specimen cutting, V-notch fabrication according to ASTM D6110, and Charpy impact testing. The resin matrix variations used were Eposchon 1011 A Epoxy Resin, AM-8927 Low Viscosity Epoxy Resin, Yukalac 157 BQTN-EX Series Polyester Resin, and Eterset 2728-PC Unsaturated Polyester Resin. The specimens were prepared with dimensions of 126 mm × 12.7 mm and thicknesses ranging from 3–12.7 mm according to ASTM D6110 standards. The results showed that resin type significantly affected the impact energy and impact value of carbon fiber composites. The AM-8927 Low Viscosity Epoxy Resin produced the highest average impact energy of 14.97 Joules and the highest impact value of 0.3000 J/mm². These values were considerably higher than those of conventional PP/ABS motorcycle fender materials. The findings indicate that carbon fiber composites with epoxy resin matrices have strong potential as alternative motorcycle fender materials with improved resistance to impact loading.
Pengaruh Metode Fabrikasi Terhadap Ketahanan Impak Komposit Sandwich Serat Karbon M. Faiz Ardiansyah; Firman Yasa Utama
Jurnal Ilmu Ekonomi, Pendidikan dan Teknik Vol. 3 No. 4 (2026): IDENTIK - Juli
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/identik.v3i4.1695

Abstract

Carbon fiber sandwich composites are lightweight materials with high potential for structural applications because they offer a good combination of strength and stiffness. However, their mechanical properties and durability are influenced by the fabrication methods used. This study aims to analyze the effects of the hand lay-up, vacuum infusion, and hybrid vacuum infusion–hand lay-up methods on the impact strength of carbon fiber sandwich composites with a Lantor Coremat core. The study employed an experimental method with a quantitative approach. Specimens were fabricated using carbon fiber, epoxy resin, and Lantor Coremat, and then tested using the Charpy impact method in accordance with ASTM D6110. The data obtained consisted of impact energy (EI) and impact value (HI), which were subsequently analyzed using quantitative descriptive statistics based on the average values for each fabrication method variation. The research results show that the hybrid method produced the highest impact resistance, with an average impact energy of 7.50 J and an impact value of 0.157 J/mm², followed by the vacuum infusion method at 5.35 J and 0.113 J/mm², and the hand lay-up method at 2.22 J and 0.047 J/mm². These results indicate that combining the vacuum infusion and hand lay-up processes improves resin impregnation quality and reduces internal defects in the composite. Thus, the hybrid method has the potential to serve as an effective fabrication alternative for producing sandwich composites with improved impact resistance for engineering applications requiring lightweight yet strong material.
Pengembangan Composite Sandwich Carbon Fiber Cork Core Menggunakan Metode Vacuum Infusion Terhadap Kekuatan Bending Muhammad Muhibuddin; Firman Yasa Utama
Jurnal Ilmu Ekonomi, Pendidikan dan Teknik Vol. 3 No. 5 (2026): IDENTIK - September
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/identik.v3i5.1769

Abstract

Sandwich composites featuring carbon fiber skins and a cork core are lightweight materials with the potential to replace metals due to their high mechanical strength and eco-friendliness. This study aims to analyze the effect of varying the number of carbon fiber skin layers on the bending strength and failure modes of the sandwich composite. Specimens were fabricated using the vacuum infusion method with skin configurations of 4, 6, and 8 layers and tested via the three-point bending method in accordance with ASTM C393 standards. The results indicate that increasing the number of skin layers enhances the maximum bending load and core shear stress. The 8-layer configuration yielded the highest maximum bending load (66.47 kg) and core shear stress (0.769 MPa), whereas the highest face bending stress (294.62 MPa) was observed in the 4-layer configuration. Face yielding was the dominant failure mode across all specimens. The findings demonstrate that the number of skin layers influences the bending strength characteristics of carbon fiber/cork core sandwich composites.
Co-Authors 'Ilmi, Muhammad Iklil Ulil Achmad, Caesario Zakaria Afdhol, Muhammad Zikri Afero Pranesti, Dennova Ahmad Khusnul Hidayat AHMAD SAPUTRA, FANDY Aji Nugroho Akbar, Mokhamad Rizky ARDI KUSUMA, JUAN Arifin, Ronald Akbar Arya Mahendra Sakti Audyna Naomi, Irena Aufillah, Muhammad Husain Austin, Aqsha Parisya AZMI ROMADHON, MIFTAKHUL Bernatan, Juda BRAHMASETA HERMIANTO, KUSUMADETYA Caesario Zakaria Achmad Chinsa, Iqbal Rifky Dany Iman Santoso Dany Iman Santoso Darmawan, Indra DHIMAS WIDAYANTO, LUTHFI Diah Wulandari Diah Wulandari DWI PRATAMA, YAN Dyah Riandadari EKA ARISMA, NIKO Fahmi, Mochamad Amrizal Fajar, Rafianto Takbiral Fawzi, Ahmad Bahar Febrianto, Andrie Seva Ferly Isnomo Abdi Firmansyah, Rian Fitri Ganda, Andita Nataria Ganda, Andita Ganda, Andita Nataria Fitri Gegatama, Muhammad Henwa Genta Arya Rahma Mahendra, Genta GUNTUR CHRISARDY, ELISA HAFIZH AINUR RASYID, AKHMAD HANAN ERITAMA, MUHAMMAD Hendra Wibowo Heru Arizal Hidayat, Ahmad Khusnul Huda Mei Setio Jalakusuma, Kevin Firdaus Juan Ardi Kusuma Khumaidillah, Moh. Rifqi Kurnia Sandy, Muhammad Khoir Kusuma, Juan Ardi Kusuma, Rachmad Andrian Jaya M. Faiz Ardiansyah Manggalasari, Lena Citra Marzad, Deftana Aqsya Mochammad Hildad Ajiban Muhammad Erlangga Adi Nugraha Muhammad Ibrahim Muhammad Muhibuddin Muhimatul Ulya Mukasafah Mujakki, Muhammad Akbar Mukasafah, Muhimatul Ulya Nadhdhif Fikri Ferdiansyah najimuddin, ahmad Nasrul, Nasrulloh Ibrahim Nur, Muhammad Baihaqi Pamenang, Ferli Rycarhana Pata Ledi, Simon Aten Rachmad Syarifudin Hidayatullah rachmansyah, fajar Rahman, Muhammad rahmani willdanata RATRIKA RINA OKTAVIANI, DEVA RIZKY BACHTIAR, MOCH Rozi Ainurrochim, Miftachur Sahroni Santoso, Muchammad Rafly Setio, Huda Mei Shadiq, Muhammad Difa Ash Shaid Khanafi Soeryanto Soeryanto Soeryanto Soeryanto Sugiarto, Fikri Ariyadhana Syafa'at, Rachmad Arif Tri Hartutuk Ningsih Tyo Echa Feriandra Umar Al Faruq WAHYU ARDYANTO, MUSLICH WARJU WARJU Wibowo, Hendra Widoretno, Yustin Setiya WIJATMIKO, FENGKI Wijatmiko, Fengki Winoto, Roy Ariel Yan Dwi Pratama Yulianto, Angki Narda ZAKARIA ACHMAD, CAESARIO Zulfa Sari