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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 661 Documents
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The effect of curvature ratio towards the fluid flow characteristics in bend pipe based on numerical methods James Julian; Fitri Wahyuni; Waridho Iskandar; Rifqi Ramadhani
TURBO [Tulisan Riset Berbasis Online] Vol 12 No 1 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i1.2564

Abstract

Internal flows in pipes are studied in greater depth and comprehensiveness in research. The computation done by using RANS equation. In particular, this study uses two equations turbulence model which is k-ε turbulence model. Mesh with 2×106 element is used because it is a mesh with lowest error. The research focuses on the effect of the curvature ratio (Rc) at the bend on changes in fluid flow characteristics. The Rc variations chosen in this study were 0.01, 0.02, and 0.03. The pipe diameter is 0.01 m, resulting in Rc/D=1, Rc/D=2, and Rc/D=3. At Rc/D=1, the maximum fluid flow velocity is in an area closer to the inner core than the outer core. The fluid velocity distribution is also more even if Rc/D=1 is enlarged. The fluid flow separation appears in the pipe with Rc/D=1, but the fluid flow separation in Rc/D=2 and Rc/D=3 is not visible. The separation is at α=75.96º, while the reattachment location is at x/D=0.014.
Analisa porositas alumunium alloy terhadap variasi temperatur pada proses squeeze casting semi solid Asroni Asroni; Tri Cahyo Wahyudi; Adek Tri Setiawan
TURBO [Tulisan Riset Berbasis Online] Vol 12 No 1 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i1.2587

Abstract

Direct squeeze casting is a process in which molten metal is cooled by applying pressure directly which aims to prevent gas porosity and shrinkage in a material. This process has the advantage of minimizing the occurrence of gas porosity and shrinkage, so there is no material disposal. The purpose of this study to determine the results of good porosity in aluminum Alloy materials with squeeze casting process. The research method is experimental by designing and making test samples of laboratory scale casting squeeze casting. The test was conducted with a variation of 300oC, 400oC, and 500oC pressure of 176 MPa, long pressing 75 seconds, holding time 9 minutes, the specimen was then tested to determine how the influence of mold temperature variations on the results of porosity and density. From the results of the study it can be concluded that the porosity defects of the casting are influenced by the given temperature variation and constant pressing. Many air cavities are trapped in the object product, the more porosity defects that will affect the resistance of the specimen, because the more the object product is solid or reduced porosity defects, the resistance of the specimen will increase. The smallest or good porosity value is shown by specimens with a temperature variation of 5000C which is 17.96%.
Pengaruh variasi temperatur dan holding time pada proses annealing leaf spring dumb truck bekas terhadap nilai kekerasan Eko Nugroho; Nurlaila Rajabiah; Tri Cahyo Wahyudi; Juda Inai
TURBO [Tulisan Riset Berbasis Online] Vol 12 No 1 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i1.2589

Abstract

Leaf spring is a flat plate component that is clamped together to obtain product efficiency using metal materials, sometimes requiring high hardness and wear resistance. The steel working process is highly dependent on the heat treatment process and the cooling media used to obtain good product quality. The purpose of this study was to determine the effect of variations in temperature and holding time in the process of annealing used leaf springs and trucks on hardness values. This test has been carried out with each variation, namely, temperature 450oC, 550oC, 650oC and held for 30, 60, and 90 minutes as well as the cooling process using air in the heating furnace room. Based on the data obtained, the influence of temperature media and holding time in the Annealing process of used leaf spring dumb trucks has a low hardness value at a temperature of 650°C with a holding time of 30 minutes, 60 minutes and 90 minutes, the lowest hardness value is at 90 minutes, namely 7.7 While the HRC temperature of 550°C and holding time of 90 minutes reaches 26.9HRC, the hardness value is higher and the same as 450°C with holding time of 90 minutes which reaches 30.8HRC. The influence of temperature and holding time on the annealing process of used leaf spring dumb trucks has the lowest hardness value at a temperature of 650°C with a holding time of 90 minutes, namely 7.7 HRC.
Evaluation of Geometric Parameter Variations in GMAW Weld Joints on SPA-H Steel: A Statistical and Practical Perspective Mochammad Igo Syamsari Sutaji; Subagiyo
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4196

Abstract

Gas Metal Arc Welding (GMAW) is widely used in the manufacturing industry for its efficiency in producing high-quality weld joints. However, the mechanical properties of these joints are strongly influenced by geometric parameters such as root gap and bevel angle. This study investigates the combined effect of root gap and bevel angle variations on the tensile and bending performance of GMAW joints using low-carbon corrosion-resistant SPA-H steel (JIS G3125). A full factorial design was employed with three levels of root gap (4 mm, 6 mm, 8 mm) and bevel angle (40°, 47.5°, 55°). Tensile, bending, and macrostructure tests were conducted, and data were analyzed using Minitab 19. Although statistical analysis (ANOVA) indicates no significant effects, practical trends reveal that the 8 mm root gap and 55° bevel angle configuration achieved the highest tensile strength (571.82 MPa) and exhibited no visual defects during the bending test. This configuration is identified as the optimal parameter setting for GMAW of SPA-H steel due to its superior mechanical integrity and weld quality.Keywords: bevel angle, GMAW welding, root gap, SPA-H steel, tensile strength,
ANALISA PENGARUH KECEPATAN MOTOR INDUKSI TERHADAP KINERJA PUTARAN MESIN PENCACAH SAMPAH PLASTIK MENGGUNAKAN TIMER H3BA Wiji Lestariningsih
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4362

Abstract

This study aims to evaluate the impact of variations in induction motor speed on the performance of PET (Polyethylene Terephthalate), PP (Polypropylene), and LDPE (Low-Density Polyethylene) plastic waste shredding machines. The developed machine is designed to cut plastic waste into small pieces. As a driver, a single-phase AC electric motor with a maximum speed of 3000 Rpm is used. The trial was conducted with three variations in motor speed: 2000 Rpm, 2500 Rpm, and 3000 Rpm, to measure the daily production capacity of the machine in shredding plastic waste. The results showed that motor speed had a significant effect on the production capacity of the machine. Of the three types of plastic tested, namely PET, PP, and LDPE, the PET type produced the highest production capacity. At a speed of 2000 Rpm, the production capacity reached 58 kg/day; at 2500 Rpm, it increased to 64 kg/day; and at 3000 Rpm, the production capacity reached 77 kg/day. This study aims to develop an efficient plastic waste shredding machine technology by utilizing the H3BA timer. The integration of this timer is expected to improve the control of the machine's operational time, so that the plastic shredding process becomes more regular and energy efficient. This machine not only increases efficiency in plastic waste processing, but also supports environmentally friendly recycling efforts.
Analisa Kegagalan Laju Kalor Di Boiler Berdasarkan Failure Modes And Effect Analysis (FMEA) Zulham Effendi; Zakwan; Gracela Noviana Harefa
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4517

Abstract

Boiler merupakan salah satu komponen utama dalam operasional pabrik kelapa sawit yang berfungsi menghasilkan uap dengan laju kalor optimal guna menunjang proses produksi. Namun, fluktuasi laju kalor dan penurunan efisiensi boiler sering terjadi sehingga mengganggu kestabilan proses dan meningkatkan risiko kegagalan operasional. Penelitian ini bertujuan untuk menganalisis kegagalan laju kalor dan efisiensi termal pada boiler, mengidentifikasi potensi kegagalan sistem, serta menentukan tingkatan risiko menggunakan metode Failure Modes and Effect Analysis (FMEA). Metode penelitian dilakukan melalui observasi lapangan selama 7 hari (3–10 Maret 2025) pada boiler pipa air (water tube) model Takuma 600 SA berkapasitas 60 ton/jam di Pabrik Kelapa Sawit. Data primer dan sekunder meliputi suhu, tekanan, massa bahan bakar, dan produksi uap yang diambil dari logsheet harian operator untuk dihitung nilai entalpi, laju kalor, dan efisiensinya. Selanjutnya, analisis risiko FMEA dilakukan dengan mengevaluasi skor severity, occurrence, dan detection (skala 1–5) untuk menghitung Risk Priority Number (RPN). Hasil analisis termodinamika menunjukkan terjadinya fluktuasi laju kalor rata-rata operasional antara 12.787 kJ/s hingga 13.867 kJ/s, di mana nilai ini belum mencapai standar spesifikasi boiler sebesar 14.002 kJ/s. Efisiensi termal boiler turut bervariasi antara 38,90% hingga 42,22%. Berdasarkan analisis FMEA, ditemukan lima mode kegagalan dengan dua risiko tertinggi yang melampaui batas kritis RPN (>30), yaitu timbulnya kerak (scaling) pada pipa-pipa uap dengan nilai RPN tertinggi sebesar 64, dan kebocoran pipa boiler dengan nilai RPN sebesar 30. Penelitian ini merekomendasikan tindakan mitigasi berupa pembersihan kimia (chemical cleaning) dan water treatment berkala untuk mengatasi kerak, serta inspeksi pipa menggunakan metode Non-Destructive Testing (NDT) demi menjaga stabilitas operasional dan efisiensi boiler.
Studi Eksperimental Pengaruh Porositas Strainer Terhadap Getaran Pada Sistem Perpipaan Michael Douglas Tampubolon; Amnur Akhyan; Mustaza Ma'a; Fortinov Akbar Irdam
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4518

Abstract

Strainer merupakan alat penyaring dalam sistem perpipaan industri migas yang berfungsi melindungi peralatan dari partikel kotoran. Penelitian ini bertujuan menganalisis pengaruh porositas strainer terhadap getaran melalui pendekatan eksperimental. Enam konfigurasi strainer diuji dengan variasi pola lubang (staggered dan straight), diameter (3 mm, 4 mm, dan 6 mm), serta porositas 25% hingga 40%. Staggered 6 mm (porositas 40%) menunjukkan performa terbaik dengan amplitudo lebih rendah yaitu 0.096 mm dan frekuensi 58.545 Hz pada debit maksimum yang menunjukkan kestabilan jika dibandingkan dengan menggunakan strainer. Temuan ini menunjukkan bahwa pemilihan porositas dan pola lubang strainer yang tepat berpotensi meningkatkan kestabilan aliran dan mengurangi potensi penyumbatan pada sistem perpipaan.
Optimization of Bicycle Frame Design With Variation of Materials Amir; Muchammad Chusnan Aprianto; Sukarman; Dodi Mulyadi; Muhammad Rahmantio Septiana
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4532

Abstract

This study shows how to model the best results of several bicycle frame designs with a variety of materials. The use of various materials to change the design of a bicycle frame is the main topic of this research. Materials such as aluminum, titanium and carbon steel have specific features that can affect the strength, weight and response of a bicycle frame. This research involves designing a bicycle frame design using SolidWorks 2022, which is then used for simulation and strength analysis with Ansys. In this experiment, various materials were used, including aluminum alloy, titanium and carbon steel to measure the stress and deformation of each design and material tested. The purpose of this research is to study how the use of different types of materials when changing the design of a bicycle frame impacts the performance and strength of the bicycle. Tests were conducted through ansys simulation, with dynamic loads under conditions of daily bicycle use. The best data obtained in design 1 on titanium material, the top-tube section experienced a stress of 18.156 MPa and a deformation of 0.012078 mm. For aluminum material, the head-tube section experienced the lowest stress of 1.211 MPa and deformation of 0.0034886 mm. These results provide important insights for developing more efficient bicycle frame designs that can be tailored to user requirements and also impact the development of new materials in the bicycle industry aimed at improving the performance and durability of bicycle frames.
Analisis Dinamika Fluida Terhadap Kinerja Turbin Cross-flow Akibat Perubahan Profil Sudu dan Debit Air pada Head Rendah mafruddin mafruddin; Sulis Dri Handono; Dwi Irawan; Adi Cahyono
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4627

Abstract

Kinerja yang optimal dalam berbagai kondisi kerja menjadikan turbin Cross-flow sebagai pilihan turbin impuls terbaik berdasarkan putaran, torsi dan daya turbin. Dimanika aliran didalam turbin berkaitan dengan kinerja turbin, dinama profil sudu memiliki peran penting dalam pemanfaatan momentum fluida, distribusi aliran dan ekstraksi energi air menjadi energi mekanik turbin. Penelitian ini bertujuan untuk menganalisis perbedaan profil sudu dan debit air terhadap karakter aliran didalam turbin dan dampaknya terhadap kinerja turbin. Penelitian eksperimental dilakukan dengan spesifikasi turbin yaitu diameter dalam runner 100 mm, diameter luar runner 150 mm, tebal nosel 30 mm, jumlah sudu 18 dan jari-jari sudu runner 24.4 mm. Pengujian turbin dilakukan dengan variasi profil sudu dan debit air pada head rendah yaitu 0.82 m. Hasil penelitian disimpulkan bahwa profil sudu dan debit air memiliki dampak yang signifikan terhadap karakter aliran dan kinerja turbin Cross-flow. Profil sudu yang optimal menghasilkan aliran yang terdistribusi seragam, ekstraksi energi yang efektif sehingga meningkatkan kinerja turbin. Debit air yang semakin besar meningkatkan volume dan kecepatan air sehingga memaksimalkan momentum dan meningkatkan kinerja turbin.   Kinerja turbin terbaik diperoleh dengan sudu profil A pada debit air 120 LPM.
Pengaruh Head terhadap Kinerja Mekanis Sebuah Kompresor sebagai Turbin (Compressor as Turbine/CAT) Muhammad Fikri Zahran; Yul Hizhar; Uyung Gatot Syafrawi Dinata
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4644

Abstract

This study aims to evaluate the mechanical performance of a turbocharger compressor operated as a water turbine. The article presents experimental results on the effect of head variation on the performance of a Compressor as Turbine (CAT). The experiments were conducted using a laboratory test rig under three head levels: 8, 10, and 12 meters. The main parameters analyzed include rotational speed, torque, turbine output power, and efficiency, all measured systematically. The experimental results indicate that the CAT system achieved stable operation and the highest energy conversion efficiency within the rotational speed range of 1000 to 2000 rpm. Within this range, flow rate, torque, and output power demonstrated a consistent relationship that produced a maximum efficiency of approximately 70%. The variation in head had a significant effect on performance, with applications at 10–12 meters head yielding more optimal results. These findings suggest that the turbocharger compressor has promising potential as an efficient and cost-effective water turbine solution, offering a balance between performance and economic feasibility. Moreover, this study contributes new experimental data to the development of CAT technology, which may accelerate its implementation in sustainable energy systems.

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