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All Journal Jurnal Dedikasi SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Rekayasa Mesin R.E.M (Rekyasa Energi Manufaktur) Jurnal Turbo : Jurnal Program Studi Teknik Mesin JTTM: Jurnal Terapan Teknik Mesin Jurnal Mesin Nusantara ARMATUR : Artikel Teknik Mesin dan Manufaktur Seminar Nasional Hasil Riset dan Pengabdian (SNHRP) Indonesian Journal of Innovation Studies PELS (Procedia of Engineering and Life Science) Procedia of Social Sciences and Humanities eProceedings of Management Prosiding SEMNAS INOTEK (Seminar Nasional Inovasi Teknologi) Innovative Technologica: Methodical Research Journal Journal for Technology and Science Journal of Aerospace Systems and Engineering Innovations Academia Open
Rachmat Firdaus
Program Studi Teknik Mesin, Universitas Muhammadiyah Sidoarjo
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Transportation Other

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Steam Turbine Performance Variation Based on Operational Parameters: Variasi Kinerja Turbin Uap Berdasarkan Parameter Operasional A’rasy Fahruddin; Muhammad Iqbal Nur Fadillah; Mulyadi; Rachmat Firdaus
Indonesian Journal of Innovation Studies Vol. 27 No. 1 (2026): January
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v27i1.2086

Abstract

This study evaluates the performance characteristics of a steam turbine under varying operational conditions in a power generation system. General Background: Steam turbines are essential components in power plants, converting thermal energy into mechanical energy for electricity generation. Specific Background: Turbine performance is influenced by parameters such as steam flow rate, blade configuration, and operating conditions, which determine efficiency and output power. Knowledge Gap: Previous studies have examined turbine performance, yet detailed evaluation under specific parameter variations in practical systems remains limited. Aims: This research aims to analyze turbine performance by examining the relationship between operational parameters and efficiency. Results: The findings show that variations in steam flow and operational parameters result in measurable differences in turbine efficiency, with certain conditions producing higher performance compared to others. Novelty: The study provides a focused analysis of turbine behavior under controlled parameter variations within a practical framework. Implications: The results provide useful insights for optimizing turbine operation in power plants to achieve improved energy conversion and system performance. Keywords: Steam Turbine, Performance, Efficiency, Power Plant, Operational Parameters Key Findings Highlights Parameter variation produces distinct operational characteristics Certain configurations yield higher system performance levels Measured results show consistent trends across testing conditions
Effect Of Additional Variations Of Etanol Fuel On Exhaust Gas Emissions On Yamaha 125cc Motorcycles: Pengaruh Variasi Penambahan Bahan Bakar Etanol Terhadap Emisi Gas Buang Pada Sepeda Motor Yamaha 125cc Nur Afif Rozikin; Rachmat Firdaus
Academia Open Vol. 4 (2021): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/acopen.4.2021.1969

Abstract

The very rapid development of the automotive world nowadays has made it a daily necessity for the community, in everyday human life it cannot be far from the name automotive, both in terms of transportation, and all kinds of supporting household needs. This can be seen from the number of motorbikes operating more when compared to other types of land transportation vehicles such as: cars. As we know, all transportation vehicles today still use non-renewable fuels. In line with the growing demand for fuel in the transportation, industrial and household sectors. Then this will result in unfavorable impacts on the environment, namely the residual exhaust gases from combustion. The remaining exhaust gases cause air pollution which can pollute the environment and can even destroy ozone which is very useful for living things on earth. In this study we use a reference concept which is then used as a concept, how is the effect of variations in the addition of ethanol fuel to exhaust gas emissions of Yamaha 125cc motorcycles by using variations in the percentage of ethanol 10%, 20%, 30% and variations in engine speed during testing, at 4600rpm, 5700rpm, and 6200rpm. It was found that the best torque and power were produced at a percentage of 10% ethanol at 6200 rpm indicating a power of 6.4 Hp and a torque of 10.6 Nm, and the best results on 30% preentae ethanol at 4600rpm showed 0.01% CO gas, 37 ppm HC gas, 1.8% CO2 gas and 18.06% O2 gas.
Optimization of Friction Stir Welding Parameters for AA6061-T651 Aluminum Alloy: Defect Analysis and Process Improvement: Optimalisasi Parameter Pengelasan Gesekan Aduk untuk Paduan Aluminium AA6061-T651: Analisis Cacat dan Peningkatan Proses Mulyadi; Rachmat Firdaus; Rahmania Sri Untari
Academia Open Vol. 8 No. 1 (2023): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/acopen.8.2023.6665

Abstract

Friction Stir Welding (FSW) is an eco-friendly process known for high-quality joints without filler metal. This study investigated the physical properties of FSW-welded joints in AA6061-T651 aluminum alloy by varying the concave shoulder angle. Optimal process parameters were determined through Taguchi optimization using an Orthogonal Array design. Macro and micro testing revealed overlap defects, kissing bond defects, and wormholes in some samples. Systematic experimentation identified key parameters to avoid defects, including tool rotation speed, welding speed, tool tilt angle, tool indentation angle, and shoulder depth. Visual inspection and microstructural analysis played a crucial role in assessing weld quality. Optimizing welding parameters, such as rotational speed, welding speed, temperature, and tool geometry, was highlighted as crucial for defect-free joints. The study offers valuable insights for researchers and professionals in the field, promoting the advancement and application of FSW in aluminum alloy welding. Highlight: FSW: An environmentally friendly welding process with good joint quality. Defect Analysis: Identification of overlap defects, kissing bond defects, and wormholes in welded joints. Process Optimization: Determination of optimal parameters to avoid defects, including tool rotation speed, welding speed, tool tilt angle, tool indentation angle, and shoulder depth. Keyword: Friction Stir Welding, AA6061-T651 Aluminum Alloy, Welded Joint Analysis, Process Optimization, Defect Prevention
ANALISA VARIASI SUHU PADA PROSES DESTILASI BIOETANOL DARI BIJI JAGUNG Rangga Bayu; A’rasy Fahruddin; Rachmat Firdaus; Edi Widodo
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10158

Abstract

The increasing demand for renewable energy has encouraged research into the development of bioethanol from abundant local raw materials, one of which is corn kernels which are rich in starch. This study was conducted to determine the effect of variations in distillation temperature on the volume and purity of bioethanol produced from fermented corn kernels. The research process begins with material preparation, namely sowing corn kernels until they germinate, grinding, then fermenting with yeast (Saccharomyces cerevisiae) for 7 days. The fermentation results were then distilled for 30 minutes using a simple distillation apparatus with three temperature variations, namely 70°C, 80°C, and 90°C. The volume of bioethanol was measured using a measuring cup, while the ethanol content was tested using an alcohol meter. The results showed that at a temperature of 70°C a volume of 130 ml of bioethanol was obtained with a purity of 67%, at a temperature of 80°C a volume of 168 ml was obtained with the highest purity of 83%, while at a temperature of 90°C the volume increased to 191 ml but the purity decreased to 73%. The data demonstrates a trade-off between ethanol volume and purity, where higher heating temperatures increase volume, but purity does not always increase. This study concludes that the optimal distillation temperature is 80°C, as lower energy can produce bioethanol with a combination of a relatively large volume and the highest purity.
Design and Testing of a Shock Absorber Disassembly Installation Tool: Perancangan dan Pengujian Alat Pemasangan untuk Pembongkaran Peredam Kejut Akhmad Akhirudin; Mulyadi; Rachmat Firdaus; Iswanto
Indonesian Journal of Innovation Studies Vol. 26 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v26i2.2174

Abstract

General Background: Shock absorbers are critical components in heavy vehicle suspension systems, functioning to reduce vibration and absorb kinetic energy generated by uneven road surfaces. Specific Background: Maintenance procedures involving shock absorber disassembly and installation commonly require substantial force, extended working time, and present safety risks when performed using conventional manual methods. Knowledge Gap: Existing approaches for servicing shock absorbers lack a dedicated tool that combines operational simplicity, time efficiency, and safer handling during both removal and installation processes. Aims: This study aimed to design, manufacture, and evaluate a tracker-based tool for shock absorber disassembly and installation. Results: The proposed tool was designed using SolidWorks Professional 2018 and fabricated from AISI 1035 steel through cutting, drilling, and assembly processes. Testing results showed the fastest shock absorber spring removal time of 1 minute 25 seconds with an average of 1 minute 29 seconds, while the fastest installation time was 2 minutes 2 seconds with an average of 2 minutes 6 seconds. Spring analysis produced a constant of 71.42 kg/cm² under a 250 kg load and 20 kg/cm² under a 70 kg load. Novelty: The study presents a multifunctional tracker-based mechanical tool specifically developed to support both disassembly and installation of heavy-vehicle shock absorbers while incorporating structural design and numerical simulation evaluation. Implications: The developed tool provides a practical solution for reducing work duration and supporting safer maintenance operations in shock absorber servicing applications.Highlights: Tracker-based equipment completed spring removal within an average of 89 seconds. Assembly procedures required approximately 126 seconds across repeated trials. Structural evaluation and load calculations confirmed operational suitability for maintenance tasks. Keywords: Shock Absorber; Mechanical Tool Design; Suspension Maintenance; Numerical Simulation; Spring Constant
Pengaruh parameter proses friction stir welding dengan material aluminium alloy AA6061-T651 terhadap distorsi dan kekerasan Mulyadi Mulyadi; Rachmat Firdaus; Iswanto Iswanto; Mochammad Nur Rizki
TURBO [Tulisan Riset Berbasis Online] Vol 11 No 2 (2022): TURBO : Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v11i2.2171

Abstract

Welding is a process of uniting two or more materials into a form of connection using heat energy. Friction Stir Welding (FSW) is a solid-state welding method that can produce high-quality welding joints for some materials with low weldability such as aluminum. The research objective was to determine the effect of process parameters on the distortion and resistance of aluminum AA6061-T651 material through the Brinell hardness test. The FSW tool used has a hexagonal pin geometry. The experimental design used the Taguchi method. This study uses 4 factors and each factor has 4 levels, the elements used are tool rotation speed, welding speed, tool tilt angle, and concave shoulder angle. The responses analyzed are distortion and hardness of the welded joint material. The effect of process parameters on the response was analyzed using ANOVA. The results of ANOVA on distortion obtained the value of Brinell hardness in the weld metal area, and in the TMAZ area. Specimen 13 with tool rotation speed parameters of 3022 rpm, welding speed of 43 mm/min, tool tilt angle of 3.5°, and concave shoulder angle of 2° with a distortion value of 0.117°. Then we get the results of the Brinell hardness of the weld metal which is close to the target of the base metal with the parameter tool rotation speed of 3022 rpm, welding speed of 90 mm/min, tool tilt angle of 2.5°, and concave shoulder angle of 8° with a Brinell hardness value of 75. 7 BHN, and the Brinell hardness value at TMAZ with tool rotation speed parameters of 1208 rpm, welding speed of 65 mm/min, tool tilt angle of 2.5°, and concave shoulder angle of 2° with a Brinell hardness value of 74.7 BHN.
Analisis Pengaruh Nilai Kalor Batubara dan Laju Feed Water terhadap Efisiensi Boiler Fire Tube 10 Ton Menggunakan Metode Langsung Rachmat Firdaus; A’rasy Fahruddin; Iswanto; Ali Akbar; Muhammad Ibrahim
Jurnal Mesin Nusantara Vol 9 No 1 (2026): Jurnal Mesin Nusantara
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/jmn.v9i1.26619

Abstract

Boiler adalah alat konversi energi yang mengubah energi bakar menjadi energi panas untuk menghasilkan uap. Dalam proses produksi minyak kelapa, PT. XXX menggunakan boiler tabung api berbahan bakar batubara sebagai uap. Tujuan penelitian ini adalah untuk menganalisis pengaruh nilai kalor batubara dan laju feed water terhadap terhadap efisiensi boiler tabung api 10 ton menggunakan teknik langsung. Data penelitian berasal dari lembar catatan operasi boiler untuk tiga periode pengamatan yaitu 3 Februari, 6 Februari, dan 9 Februari 2025, dengan durasi pengamatan 24 jam. Nilai batubara yang digunakan sekitar 24.001 kJ/kg, 22.644 kJ/kg, dan 23.121 kJ/kg. Menurut hasil penelitian, batubara dengan nilai kalor 24.001 kJ/kg menghasilkan efisiensi rata-rata tertinggi sebesar 78%, sedangkan batubara dengan nilai kalor 23.121 kJ/kg menghasilkan efisiensi rata-rata terendah sebesar 72%. Suhu udara rata-rata berkisar antara 83,0°C, 77,4°C, dan 73,4°C selama berbagai periode pengamatan. Temuan analisis menunjukkan bahwa peningkatan suhu dan suhu batubara feed water dapat meningkatkan efisiensi boiler, sedangkan peningkatan laju feed water berpotensi menurunkan efisiensi boiler. Akibatnya, efisiensi boiler tidak hanya dipengaruhi oleh kualitas bakar tetapi juga oleh kondisi operasi sistem. Oleh karena itu, perlu dilakukan penyesuaian terhadap kedua faktor tersebut untuk mencapai kinerja boiler yang optimal.
Evaluasi Kinerja Pompa Booster Berdasarkan Analisis Head Loss dan Total Dynamic Head pada Sistem Distribusi Air Bersih Gedung Bertingkat ali akbar; Rachmat Firdaus; Metatia Intan Mauliana; Diyas Robikh Arafat
Jurnal Mesin Nusantara Vol 9 No 1 (2026): Jurnal Mesin Nusantara
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/jmn.v9i1.26670

Abstract

Pada sistem distribusi air bersih di gedung bertingkat, pompa pendorong (Booster pump) diperlukan untuk mengkompensasi perbedaan ketinggian dan kehilangan energi pada sistem perpipaan. Kinerja pompa sangat dipengaruhi oleh head loss akibat gesekan sepanjang pipa dan fitting yang digunakan. Tujuan penelitian ini adalah untuk mempelajari kinerja pompa pendorong CDX/I 120/20 IE3 pada sistem distribusi air bersih menuju tangki atap Gedung Bank BUMN Surabaya dengan perhitungan head loss dan kesesuaian kapasitas pompa dengan kebutuhan sistem. Metode penelitian yang digunakan adalah observasional dan analitis, meliputi pengukuran dimensi pipa, identifikasi fitting, dan perhitungan parameter aliran menggunakan persamaan Darcy-Weisbach dan koefisien kehilangan energi fitting. Hasil penelitian menunjukkan bahwa total head loss sistem adalah 11,06 m, yang terdiri dari head loss mayor sebesar 9,58 m dan head loss minor sebesar 1,48 m. Kehilangan energi utama terjadi pada pipa berdiameter 1,5 inci dengan kontribusi sebesar 61,7% terhadap total head loss. Perhitungan Total Dynamic Head (TDH) memberikan nilai 39,06 m. Sebaliknya, head maksimum pompa adalah 40,50 m. Ini berarti margin head yang tersedia hanya 1,44 m. Hasil menunjukkan bahwa pompa masih mampu memenuhi kebutuhan distribusi air ke tangki atap pada ketinggian ±28 m, meskipun bekerja mendekati batas kapasitas operasionalnya. Oleh karena itu, optimasi sistem perpipaan diperlukan untuk meningkatkan kinerja sistem dan keandalan distribusi air.
Evaluasi Potensi Head Loss pada Sistem Distribusi Air Taman Gedung Bank BUMN di Surabaya Berdasarkan Konfigurasi Jaringan Perpipaan ali akbar; Rachmat Firdaus; Prantasi Harmi Tjahjanti; Rizky Dwi Aldiantofas
Jurnal Mesin Nusantara Vol 9 No 1 (2026): Jurnal Mesin Nusantara
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/jmn.v9i1.26671

Abstract

Sistem distribusi air pada gedung bertingkat memerlukan jaringan perpipaan yang dapat mengalirkan air secara efektif ke seluruh titik penggunaan. Salah satu faktor yang mempengaruhi kinerja sistem distribusi adalah Head Loss aliran yang terjadi akibat proses sepanjang pipa dan penggunaan berbagai aksesoris perpipaan. Tujuan dari penelitian ini adalah untuk mengevaluasi potensi Head Loss pada sistem distribusi air taman Komplek Gedung Bank BUMN Surabaya berdasarkan konfigurasi jaringan perpipaan eksisting dengan menggunakan pendekatan Darcy–Weisbach. Data penelitian ini diperoleh dari observasi lapangan, yang meliputi panjang pipa, diameter pipa, jumlah fitting, kapasitas tangki atap, dan konfigurasi jaringan distribusi. Sistem distribusi terdiri dari enam jalur perpipaan (line 1–line 6) yang menggunakan aliran gravitasi dari tangki atap berkapasitas 5000 L dengan ketinggian sekitar 28 m. Karakteristik geometri jaringan dan potensi Head Loss pada setiap jalur distribusi dianalisis. Hasil penelitian menunjukkan bahwa faktor utama yang mempengaruhi potensi Head Loss pada sistem distribusi air kebun adalah panjang pipa, diameter pipa, jumlah fitting dan percabangan. Line 5 memiliki potensi Head Loss terbesar berdasarkan karakteristik jaringan karena memiliki jumlah titik keluaran dan fitting yang paling banyak, sedangkan Line 6 memiliki potensi Head Loss yang lebih kecil karena konfigurasi jaringan yang lebih sederhana. Hasil penelitian ini dapat digunakan sebagai dasar evaluasi dan pengembangan sistem distribusi air berbasis gravitasi pada gedung bertingkat agar lebih efisien dan andal.
Analisis Kinerja Hidraulik Pompa Sentrifugal Tipe CDX/I 120/20 IE3 pada Sistem Distribusi Air Bersih Gedung BUMN di Surabaya ali akbar; Rachmat Firdaus; Metatia Intan Mauliana; Muhammad Zainal Abidin
Jurnal Mesin Nusantara Vol 9 No 1 (2026): Jurnal Mesin Nusantara
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/jmn.v9i1.26672

Abstract

Keandalan sistem distribusi air bersih pada bangunan bertingkat sangat bergantung pada pemilihan pompa dan karakteristik hidraulik jaringan perpipaan untuk menjamin kontinuitas suplai serta kestabilan tekanan pada seluruh titik pelayanan. Penelitian ini bertujuan menganalisis kinerja hidraulik pompa sentrifugal tipe CDX/I 120/20 IE3 pada sistem distribusi air bersih Gedung BUMN di Surabaya melalui evaluasi kapasitas aliran, tekanan operasi, dan kehilangan energi pada jaringan perpipaan. Penelitian menggunakan pendekatan kuantitatif melalui observasi lapangan dan analisis hidraulik berdasarkan perhitungan debit aliran, bilangan Reynolds, faktor gesek menggunakan persamaan Colebrook–White, major head loss, minor head loss, serta total dynamic head. Hasil analisis menunjukkan bahwa konfigurasi tiga pompa sentrifugal yang dioperasikan secara paralel mampu menyediakan debit total sebesar 480 L/menit dengan head maksimum 40,5 m, sehingga memenuhi kebutuhan distribusi air bersih pada gedung setinggi 9 m. Analisis juga menunjukkan bahwa panjang pipa, diameter pipa, dan jumlah aksesoris perpipaan merupakan faktor utama yang memengaruhi kehilangan tekanan pada sistem distribusi. Sistem kontrol berbasis Programmable Logic Controller (PLC) dan pressure switch mampu mempertahankan tekanan operasi secara otomatis sesuai kebutuhan beban pemakaian. Temuan penelitian ini menunjukkan bahwa konfigurasi pompa paralel dengan sistem kontrol berbasis PLC dan pressure switch merupakan alternatif yang efektif untuk meningkatkan keandalan sistem distribusi air bersih pada bangunan bertingkat melalui penyediaan debit yang memadai dan kestabilan tekanan operasi.
Co-Authors A'rasy Fahruddin Afif , Muhammad Syauqi Ahmad Ahfas Ajitiyo Dananjoyo Akhmad Akhirudin Alfiansyah Satrio Wicaksono Ali Akbar Ali Akbar Ali Akbar Annisa Nurbaiti Aziz, Eriq Helmy Barafi, Keigant Abdullah bhima endra wira yudha Deannes Isynuwardhana Diyas Robikh Arafat Edi Widodo Edi Widodo Efendi, Muchammad Ferdiansyah, Faris Fernanda, Ardhi Shefta Firdaus , Muhamad Hamzah Setiawan Huesein, Wa Ode Asma’ul Husna Iqlima, Anita Rahma Nur Irfan Dwi Farilla iswanto Iswanto Iswanto Metatia Intan Mauliana Metatia Intan \ Mauliana Mochammad Nur Rizki Mohamad Affan Rahmadin Mohammad Afif Fajar Mohammad Dani Iswanto Muhamad Ridwan Yunus Muhammad Ibrahim Muhammad Iqbal Nur Fadillah Muhammad Syahril Muhammad Zainal Abidin MULYADI Mulyadi Mulyadi Mulyadi Mulyadi Nia Nuraeni Suryaman Nur Afif Rozikin Pangestu, Eka Adji Paramitha Amelia Kusumawardani Perbawa, Dafva Ari Prantasi Harmi Tjahjanti Prasetya, Fikri Putra , Ahmad Nurwanda Bawono Rachmadani, Dhaniar Gumelang Rahmania Sri Untari Raihan Maulana Zulfikar Rangga Bayu Ribangun Bamban Jakaria Rizky Dwi Aldiantofas Sari, Ghulam Muhammad Abdu Satria Agung Wibisono Shodiq, Ja’far Siti Cholifah Wahid , M. Luqman Waluyo, Satrio Wijaya, Yanuar Eka wira yudha, bhima endra Yulianto, Achmad Irfan