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Turbo : Jurnal Program Studi Teknik Mesin
Published by Universitas Muhammadiyah Metro
ISSN : 23016663     EISSN : 2477250X     DOI : https://doi.org/10.24127
Core Subject : Engineering,
Mechanical Engineering
TURBO ISSN (print version) 2301-6663 & ISSN (online version) 2477-250X is a peer-reviewed journal that publishes scientific articles from the disciplines of mechanical engineering, which includes the field of study (peer) material, production and manufacturing, construction and energy conversion. Articles published in the journal Mechanical include results of original scientific research (original), and a scientific review article (review). Mechanical journal published by the Department of Mechanical Engineering, Faculty of Engineering, University Muhammadiyah of Metro for publishing two periods a year, in June and December with the number of articles 14-20 per year . Editors receive manuscripts in mechanical engineering from various academics, researchers and industry practitioners.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 756 Documents
 65   66   67   68   69 
Parametric Design Optimization of Inner Chassis Retarder Bracket Using Finite Element Analysis Nicky Yongkimandalan; Mochammad Dwi Julianto
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/turbo.v15i1.4957

Abstract

The inner chassis retarder bracket is a critical structural component in heavy-duty truck braking systems that transfers braking loads from the electromagnetic retarder to the vehicle chassis. Excessive stress concentration in this component may reduce structural reliability and increase the risk of failure during operation. Although finite element analysis (FEA) has been widely applied to optimize automotive brackets, studies focusing on the parametric optimization of heavy-duty inner chassis retarder brackets through local geometric modification remain limited. This study aims to optimize the structural performance of the right-side inner chassis retarder bracket by investigating the effects of fillet radius and bracket thickness using finite element analysis. Three fillet radius (5, 10, 15, and 20 mm) and thickness levels 10 mm and 16 mm were evaluated for two candidate materials, ASTM A36 structural steel and GGG60 ductile cast iron, resulting in eighteen design configurations. Static structural simulations were performed using ANSYS Workbench 2022 R1 under combined gravitational and retarder torque loading. Structural performance was assessed based on equivalent (von Mises) stress, total deformation, and safety factor. The optimum configuration was obtained using a 15 mm fillet radius and a 16 mm bracket thickness. Compared with the initial design, this configuration reduced the maximum von Mises stress by 62.90% for ASTM A36 steel and 66.01% for GGG60, while decreasing the maximum deformation by 61.19% and 54.91%, respectively. The corresponding minimum safety factor increased by 169.62% for ASTM A36 steel and 335.47% for GGG60, indicating a substantial improvement in structural reliability. These results demonstrate that localized geometric optimization combined with appropriate material selection effectively improves the structural performance of heavy-duty retarder brackets without requiring major modifications to the overall component geometry.
Analisis Pengaruh Variasi Waktu Perlakuan Alkalisasi KOH (Kalium Hidroksida) Terhadap Sifat Mekanik Serat Tunggal Purun Tikus (Eleocharis Dulcis) Akhmad Syarief; Iphan Fitrian Radam; Muhammad Nizar Ramadhan; Akhmad Ghiffary Budianto; Fadliyanur; Aulia Aufa Ramdhasari
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4569

Abstract

The utilization of purun tikus (Eleocharis dulcis) fiber as a reinforcement material for composites has considerable potential due to its high cellulose content. However, the hydrophilic nature of this fiber limits its interfacial bonding with the matrix, thus requiring chemical treatment to enhance its performance. This study aims to analyze the effect of varying alkali treatment durations using KOH solution on the mechanical properties of single purun tikus fibers. The alkali treatment was conducted by immersion for 3, 6, 9, and 12 hours. Mechanical tests included tensile and pull-out tests to evaluate tensile strength, elongation, elastic modulus, and interfacial shear strength (IFSS). The results showed that treatment for 3 hours provided the most significant improvement, with tensile strength reaching 75.25 MPa, elastic modulus of 12,137.5 MPa, and IFSS of 13.78 MPa. This improvement is attributed to the removal of lignin and hemicellulose, which enhanced fiber–matrix interfacial bonding. Conversely, longer treatment durations led to cellulose degradation and decreased mechanical performance. Therefore, the optimum alkali treatment duration using KOH for purun tikus fibers is 3 hours, which yields maximum improvements in mechanical strength and interfacial bonding quality.
FERROUS OXALATE FROM METAL WASTE FOR ADVANCED MATERIALS: A REVIEW Yasa Sanusi; Deni Shidqi Khaerudini
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4640

Abstract

The rapid development of the manufacturing industry, particularly in the machining sector, generates a significant volume of metal waste. Most of this waste ends up as scrap without undergoing any valuable recycling process, which poses environmental challenges and potential contamination risks. However, the large amount of waste produced contains potentially high material value, presenting opportunities to develop new approaches to waste management based on sustainability principles, thereby creating new economic opportunities. Previous research has demonstrated that metal waste can be converted into ferrous oxalate using various methods and tests, making it a valuable material. Therefore, further scientific studies are needed in the form of journal reviews of previous research to identify, analyze, and evaluate the potential of ferrous oxalate from metal waste materials to become advanced sustainable materials. The method used is a scoping review of the literature. Findings indicate that a variety of iron-rich wastes can be effectively converted into high-purity ferrous oxalate through environmentally friendly processes. Ferrous oxalate exhibits remarkable potential in energy storage, heavy metal removal from wastewater, pigment, sustainable cement, electrorheological fluids, and gas sensors. This review is expected to open new perspectives on utilizing iron waste as value-added materials with high economic value.
Perancangan Mesin Automatic PTFE Tape Wrapper untuk Kebutuhan Perekatan Katup LPG 1/2 inch hingga 3/4 inch Muhammad Rizal Ardiansyah; Dadan Heryada Wigenaputra; Dwiky Maulana Atmadji
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4688

Abstract

PTFE tape is an additive material used in fastening processes, particularly on threads or screw joints. Its function is to provide sealing properties ensuring tightness and leak prevention at the bonded interface. One notable application is found at a gas cylinder maintenance facility operating under direct authorization from PT. Pertamina. This facility targets a daily operational capacity of handling thousands of Liquefied Petroleum Gas (LPG) cylinders. However, the seal tape installation on each valve is still performed manually, which presents several operational challenges in terms of efficiency and consistency. This research focuses on designing an automated device for seal tape application. The primary objective is to develop an automatic seal tape wrapper machine to optimize the sealing process in terms of speed and reliability. To achieve this, the design process follows the VDI 2206 methodology from the Verein Deutscher Ingenieure (Association of German Engineers) and utilizes the 3D modeling software SolidWorks. The final outcome is a PTFE tape machine capable of operating automatically with a cycle time of 5-6 seconds per valve, and a production capacity of up to 3,900 valves per day.
Karakteristik Pembakaran Droplet Campuran Bensin Oktan Rendah dengan Penambahan Minyak Kulit Jeruk Musyaroh; Anisah Nurul Izzah; Rizqa Ruviana; Fatkhurrohman; Tria Puspa Sari; Widya Wijayanti
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4741

Abstract

The use of waste as an alternative fuel is being continually developed to support the clean energy transition. Orange peel oil (OPO) contains limonene, a volatile hydrocarbon compound with double bonds that has the potential to be used as a gasoline additive. However, studies directly examining its effect on droplet combustion characteristics are still limited. This study aims to fill this gap by evaluating the droplet combustion dynamics of a mixture of low-octane gasoline and OPO through visual and thermal approaches. Experiments were conducted by burning 10 µL droplets using a metal stand, with the essential oil concentration varying from 1% to 100%. Visualization was performed using a high-speed camera, and temperature measurements were carried out with a K-type thermocouple. The results showed that the addition of OPO prolonged the combustion time, decreased the combustion rate constant, and increased the maximum temperature. Microexplosions were observed starting at concentrations ≥25%, due to differences in boiling points between the components. Flame visualization confirmed the quantitative results, with brighter and longer-lasting flames at higher concentrations. This study concludes that OPO can significantly modify the droplet combustion characteristics and shows potential as a waste-based biofuel additive, which can improve the efficiency and sustainability of gasoline combustion systems
IMPLEMENTATION OF IOT TEMPERATURE AND HUMIDITY ON MOISTURE CONTENT VALUES IN NUTMEG SEED DRYERS USING ELECTRIC STOVES Festo Andre Hardinsi; Mustari; Sofyan Sukwara Akfan; Christof Geraldi Simon
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4819

Abstract

Fakfak Regency is known as an abundant producer of nutmeg fruits and seeds and is dubbed the nutmeg city. However, there is a problem that often occurs in nutmeg farmers, namely, aflatoxin attacks. In addition, there are several obstacles for nutmeg farmers, namely declining processing time efficiency and declining productivity in nutmeg seed quality. Therefore, it is necessary to monitor the nutmeg drying process.  The purpose of this study is to monitor the real-time process time, temperature, and humidity of the IoT nutmeg drying device on the moisture content. The method used in this study is design of a nutmeg seed dryer using an electric stove. The design uses an IoT monitoring implementation. Based on the SNI-01-0006-1993, the appropriate moisture content value in the nutmeg seed dryer is obtained by using an electric stove within 10 and 13 hours. The results of the 10-hour study showed a moisture content value of 9.77% and the results of IoT monitoring showed a temperature value of 54°C and a humidity of 78g/kg. And the results of the 13-hour study showed a moisture content value of 6.28% and the results of IoT monitoring showed a temperature value of 65°C and a humidity of 85g/kg.
Analysis of Booster Pump Power and Feasibility Using Total Head and NPSH Calculations on Triethylene Glycol (TEG) Circulation System of Project X in Offshore Fabrication Industry : Case Study at PT. NOV Profab Indonesia Muhamad Agung; Abrar Ridwan
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4960

Abstract

The Triethylene Glycol (TEG) circulation system functions to maintain the stability of the natural gas dehydration process by continuously circulating TEG from the surge drum to the process equipment. The booster pump plays a crucial role in sustaining the system’s flow rate and pressure to ensure optimal water vapor absorption. This study aims to calculate the total head of the system and evaluate the Net Positive Suction Head (NPSH) of the booster pump in the TEG circulation system at Project X, located at PT. NOV Profab Indonesia’s offshore fabrication facility. The calculation was performed using Bernoulli’s equation combined with major and minor head loss analysis, while the NPSHr (required) value was determined based on the HSVN (Head Suction Vapour Number) derived from the Cavitation Chart. The analysis results show that the total head of the system is 5.6 meters and the NPSHa (available) is 5.6 meters, which is higher than the NPSHr obtained from the HSVN data of 1.6 meters. Therefore, the pump operates safely without cavitation. These findings can serve as a reference for evaluating pump performance and as a design basis for TEG circulation systems in gas production facilities with similar characteristics.
Uji kinerja mesin pemecah kulit kemiri tipe impact rotary Fahrizal Fahrizal; Sealtial Mau; Damianus Manesi; Tri Mandala Putra
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.5011

Abstract

An impact rotary–type candlenut shelling machine utilizes centrifugal force to strike candlenuts that fall by gravity, projecting them outward to collide with the chamber wall. This method is expected to provide higher shelling efficiency than existing techniques. This study aimed to examine the effect of blades rotational speed on shelling efficiency. An experimental approach with a randomized design was employed, using rotational speed as a single factor with four levels: 850, 980, 1140, and 1300 rpm. Candlenuts were obtained from farmers in Amarasi District, Kupang Regency. The candlenuts were dried in the sun for 5 days before testing. Data collection was carried out by testing a shelling machine according to the experimental design. The results of the study found that the higher the rotation speed of the blades, the higher of capacity. Shelling efficiency was evaluated by measuring the weight of shelled candlenuts from each treatment. The results of the study found that the higher the rotation speed, the higher the capacity. However, the highest shelling efficiency was achieved at 850 rpm, the lowest effective speed. At this speed, the output consisted of 33.03% whole kernels, 30.33% semi-broken kernels, 15.9% crushed kernels, and 20.74% kernels with adhering shell fragments.
Studi Numerik Pengaruh Geometri Leading-edge Tubercle terhadap Performa Aerodinamika Sayap pada Bilangan Reynolds Rendah Dewa Akbar Ramadhani; Retno Wulandari
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.5209

Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh geometri leading-edge tubercle terhadap performa aerodinamika airfoil pada bilangan Reynolds rendah menggunakan metode Computational Fluid Dynamics (CFD). Airfoil yang digunakan adalah NACA 0018 dengan variasi amplitudo dan panjang gelombang tubercle. Simulasi dilakukan pada bilangan Reynolds 1,2 × 105 dengan sudut serang 12° dan 18° yang mewakili kondisi pre-stall dan near-stall. Hasil menunjukkan bahwa pada kondisi pre-stall pengaruh tubercle relatif kecil, sedangkan pada kondisi near-stall sebagian besar konfigurasi menghasilkan nilai koefisien lift dan efisiensi aerodinamika yang lebih rendah dibandingkan baseline. Namun, beberapa konfigurasi menunjukkan penurunan performa yang lebih bertahap yang mengindikasikan terjadinya penundaan stall. Hasil ini menunjukkan bahwa peran utama tubercle pada bilangan Reynolds rendah lebih berkaitan dengan modifikasi karakteristik stall dibandingkan peningkatan performa maksimum.
ANALISA KEBUTUHAN BEBAN PENDINGIN DAN DAYA ALAT PENDINGIN AC UNTUK AULA KAMPUS 2 UM METRO. Kemas Ridhuan; Andi Refai
TURBO [Tulisan Riset Berbasis Online] Vol 2 No 2 (2013): Desember 2013
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v2i2.26

Abstract

Factor-faktor kenyamanan dari suatu ruangan sangat ditentukan oleh letak, karaktristik dan kegiatan yang ada di dalamnya. Untuk mengatasi hal tersebut diperlukan suatu alat pendingin dengan beban pendinginan yang sesuai dengan kebutuhan ruang tersebut. Aula kampus 2 UM Metro sebagai tempat aktifitas akademik yang yang beragam, setiap saat selalu ramai dengan kapasitas 250 orang, memerlukan slot777 beban pendingin yang memadai. Penelitian ini bertujuan untuk mengetahui beban pendiginan dan daya pendinginan dari alat AC yang diperlukan untuk ruang Aula tersebut. Metode penelitian yang dilakukan yaitu kajian pustaka dan observasi. Mengamati berbagai kejadian seperti sudut pancaran sinar matahari, mengukur suhu dinding luar, dinding dalam, berbagai aksesoris yang ada dan jenis kegiatan yang dilakukan. Kemudian melakukan perhitungan dengan kajian pustaka. Hasil penelitian yang didapat yaitu beban pendinginan dari seperti dinding bata dengan lapisan plester, kaca, atap dari paduan alumunium, lantai dari beton dan keramik, lampu, penghuni, peralatan elektronik dan 250 orang jumlah maksimal yang ada pada ruangan aula kampus 2 UM Metro didapat sebesar 47,87 kW dan besar daya sistem pendingin AC yang diperlukan untuk mendinginkan beban pendinginan dari daya kompresornya sebesar 1,77 kW. Apabila dikonversikan daya kompresor 1,77 kW setara dengan 2,4 PK. untuk pemasangan AC dari 2,4 PK dibutuhkan 5 unit alat pendingin yang masing-masing alat berkapasitas ½ PK agar pendinginan diruang tersebut lebih efisien.

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