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Gd. H Lt.2 Jurusan Teknik Mesin Fakultas Teknik Universitas Lampung Jl. Prof. Soemantri Brojonegoro No.1 Bandar Lampung
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Jurnal Mechanical
Published by Universitas Lampung
ISSN : 20871880     EISSN : 24601888     DOI : https://doi.org/10.2960/mech
Core Subject : Science, Engineering,
Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Jurnal Mechanical (eISSN 2460 1888 and pISSN 2087 1880), 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 University of Lampung and managed by Department of Mechanical Engineering, Faculty of Engineering for publishing two periods a year, in March and September .
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 234 Documents
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Integration of Robotic Education and Islamic Religious Education through the Line Follower Robot Working Model Hertanti, Erina
JURNAL MECHANICAL Vol 15 No 1 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i1.4405

Abstract

Designing robotic technology as an innovation to realize more varieties in the learning process is an interesting idea to be implemented in class. This study tries to implement robotic technology innovation into Islamic Religious Education through the line follower robot working model. In this study, the working model is used as an educational media that is implemented within the scope of good morals (al-akhlaq al-mahmudah) and bad morals (al-akhlaq al-mazmumah). This study uses the design-build method to realize the final result as a product. The product design includes designing a guide line for the line follower robot and assembling a line follower robot design system based on the results of device requirement analysis. The results of the implementation of the line follower guide line design are realized on a Flexi paper with a length of 3 meters and a width of 2 meters. While the results of the implementation of the line follower robot design system assembly are in the form of a physical/robot frame, a series of electronic hardware systems, and programs built using C language with the CodeVision AVR compiler. Based on the performance test of the line follower robot, it can be concluded that the overall design system has been successfully realized.
Pengaruh Variasi Jumlah Sudu dan Twist Angle Terhadap Performa Turbin Heliks Menggunakan Metode CFD Sugiri, Agus
JURNAL MECHANICAL Vol 15 No 1 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i1.4406

Abstract

Energi arus air merupakan salah satu potensi energi terbarukan yang mudah ditemukan seperti saluran irigasi, aliran sungai dan gelombang laut. Selain ramah lingkungan energi arus air juga memiliki intensitas energi kinetik yang cukup besar. Pemanfaatan potensi arus air untuk menghasilkan listrik dapat dilakukan menggunakan turbin heliks. Turbin heliks merupakan bentuk modifikasi dari turbin darrieus, untuk mengatasi kelemahan turbin darrieus sudu pada turbin heliks dibuat berbentuk melengkung dengan kemiringan sudut tertentu. Penelitian ini bertujuan untuk mengetahui unjuk kerja turbin heliks menggunakan metode CFD. Penelitian ini dilakukan dengan melakukan simulasi terhadap penambahan jumlah sudu dan twist angle pada turbin heliks. Variasi jumlah sudu adalah 2, 3 dan 4 sudu sedangkan variasi twist angle sebesar 60°, 90° dan 120°. Hasil simulasi menunjukkan bahwa penambahan jumlah sudu dan twist angle berpengaruh positif terhadap performa turbin heliks, terjadi peningkatan nilai torsi yang diperoleh. Penambahan jumlah sudu dan twist angle akan mengakibatkan massa/beban turbin saat berputar semakin tinggi atau yang disebut dengan momen inersia sehingga menghasilkan gaya lebih besar dan torsi meningkat. Hasil simulasi dengan menggunakan variasi jumlah sudu diperoleh performa terbaik pada jumlah sudu 4 dimana Cp yang dihasilkan sebesar 0,287. Pada pengujian dengan variasi twist angle didapat performa terbaik pada sudut 120° dengan nilai Cp yang dihasilkan sebesar 0,312.
Fluid Flow Analysis Subsonic Wind Tunnel for Aerodynamic Testing Using Computational Fluid Dynamics (CFD) Riszal, Akhmad
JURNAL MECHANICAL Vol 15 No 1 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i1.4407

Abstract

Seiring berkembangnya zaman, banyak sekali teknologi yang dapat dimanfaatkan untuk mendukung penelitian, terutama dalam pembuatan model, alat, dan instrumentasi. Salah satu alat yang dapat digunakan untuk menunjang penelitian aerodinamis adalah Wind Tunnel. Wind Tunnel merupakan perangkat pengujian aerodinamis yang mampu mensimulasikan dan memvisualisasikan kondisi aliran fluida di sekitar objek yang diuji. Tujuan dari penelitian ini adalah menganalisis aliran fluida pada berbagai bagian terowongan angin dengan menggunakan aliran fluida seragam. Analisis akan dilakukan dengan menggunakan software Ansys khususnya Computational Fluid Dynamics (CFD). Parameter yang akan diuji antara lain kecepatan fluida 6 m/s. Pada kecepatan tertentu, eksperimen aliran fluida akan dilakukan untuk memvisualisasikan distribusi aliran di berbagai bagian Terowongan Angin, dari bagian kontraksi hingga Diffuser. Visualisasi aliran pada bagian kontraksi, akan terjadi peningkatan tekanan fluida menuju bagian uji kontur tekanan total. Ketika fluida mengalir melalui bagian uji dengan besaran kecepatan, ia akan bertransisi ke aliran laminar dan fluida melewati bagian diffuser, sehingga terjadi penurunan kecepatan.
Initial analysis of temperature distribution in V-shaped Thermal Collector Prayitno, Hadi; Prabowo, Angga Darma; Khairudin, Rizal
JURNAL MECHANICAL Vol 15 No 1 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i1.4551

Abstract

Pada tahun 2030 Indonesia menargetkan  pengurangan emisi hingga 29% dengan upaya sendiri dan 41% dengan bantuan internasional. Optimalisasi penggunaan energi termal dapat menekan laju emisi karbon. Kolektor termal juga dapat dioptimalkan sebagai teknologi pengeringan paska panen dalam menunjang pertanian berkelanjutan. Kolektor termal memiliki bergbagai macam jenis. Sebagai analisis awal karakteriristik perpindahan panas pada kolekor dimodelkan dengan mengunakan kolektor berbentuk V (V Groove). Distribusi Temperatur diamati dengan menggunakan komputasi dinamika fluida. Simulasi dilakukan diawali proses pemodelan, yaitu menentukan desain geometri dan material, melakukan meshing dan menentukan kondisi batas. Reynold number yang digunakan dalam penelitian ini 1500, 3000, dan 4500 yang masing-masing mewakili laminar, transisi, dan turbulen. Iradiasi matahari disimulasikan pada 1000, 800, dan 600 W/m2. Penelitian pendahuluan ini menunjukkan semakin tinggi bilangan Reynold semakin rendah temperatur udara keluar dan temperatur permukaan kolektor. Semakin besar iradiasi, semakin besar temperatur udara keluar kolektor dan temperatur permukaan kolektor yang dihasilkan.
PENGARUH PERLAKUAN PANAS QUENCHING TERHADAP NILAI KEKERASAN DAN STRUKTUR MIKRO BAJA JIS SUP 9A Asisi, Andriko Nuwari
JURNAL MECHANICAL Vol 15 No 2 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i2.4567

Abstract

Baja JIS SUP 9A merupakan bahan baku dalam pembuatan pegas daun dan termasuk baja karbon paduan sedang. Salah satu cara untuk meningkatkan sifat mekanik baja tersebut adalah dengan proses perlakuan panas (heat treatment) salah satunya quenching. Penelitian ini dilakukan dengan tujuan menganalisis pengaruh annealing dan quenching terhadap kekerasan baja JIS SUP 9A serta menganalisis perubahan struktur mikro baja JIS SUP 9A setelah dilakukan perlakuan annealing dan quenching. Material diberi perlakuan panas annealing dan quenching dengan temperatur 250°C dan 350°C serta pengujian kekerasan dengan metode rockwell, vickers, dan brinell. Hasil penelitian menyimpulkan bahwa baja JIS SUP 9A dengan perlakuan panas quenching yaitu pada temperatur 250°C dan 350°C meningkatkan kekerasan baja dibandingkan dengan perlakuan panas annealing. Pengamatan struktur mikro baja JIS SUP 9A menggunakan alat Optical Microscopy (OM) yang terbentuk pada perlakuan annealing menunjukkan fasa ferit dan perlit yang diakibatkan oleh pendinginan yang sangat lambat serta pada perlakuan quenching temperatur 250°C dan 350°C menunjukkan fasa martensit dan ferit dengan martensit yang lebih dominan terbentuk dikarenakan oleh proses pendinginan secara cepat sehingga meningkatkan nilai kekerasan tinggi pada baja.
PEMBUATAN BIOPELET DENGAN MESIN EXTRUDER BERBAHAN BAKU LIMBAH PENYULINGAN BUAH PALA Ibrahim, Gusri Akhyar
JURNAL MECHANICAL Vol 15 No 2 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i2.4815

Abstract

Fossil energy is running low, causing an increase in the selling price of fossil fuels. This causes the global community to become aware and consider using renewable fuels which are more environmentally friendly. Utilizing nutmeg refining waste into biopellets can be a solution for managing waste and producing alternative fuel. This research focuses on utilizing nutmeg refining waste into biopellets with a mixture of 0%, 3% and 5% tapioca flour using an extruder machine with engine rotation speeds of 1700 RPM and 2800 RPM. The aim of this research is to determine the composition of the adhesive mixture and the engine rotation speed to obtain optimal heating value. The materials in this research were solid waste from nutmeg distillation and tapioca as adhesive. Making biopellets uses 2 treatments, namely 3 variations of adhesive mixture (0 gram, 90 grams, 150 grams) and 2 variations of machine rotation speed (1700 RPM and 2800 RPM). Meanwhile, the tools used are a pellet printing machine, tachometer, digital balance and caloribomb. The results obtained from testing the calorific value in this study were sample A 5,094.27 cal/g, Sample B 5,603.14 cal/g, Sample C 5,346.24 cal/g, Sample D 5,604.85, Sample E 5,789.10 cal/g, Sample F 5,571.65. So it can be concluded that the addition of adhesive and the engine rotation speed on the extruder machine affect the heating value obtained. Keywords: Biopellets, Extruder Machine, Nutmeg Refining Waste, Calorific Value
Development and Characterization of Advanced Recycled Hybrid Metal Matrix Composites via Enhanced Stir Squeeze Casting Method for Industrial Applications Unegbu, Hyginus Chidiebere Onyekachi; Yawas, Danjuma S.
JURNAL MECHANICAL Vol 15 No 2 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i2.5267

Abstract

This study presents the development and characterization of advanced recycled hybrid metal matrix composites (HMMCs) using an optimized stir squeeze casting technique. The hybrid composites were fabricated using recycled aluminum alloy (AA6061), ceramic particles, and carbon fibers. The optimization of critical process parameters such as stirring speed, casting temperature, and squeeze pressure resulted in composites with superior mechanical and physical properties. Comprehensive testing revealed that the HMMCs exhibited a 20% increase in tensile strength, a 30% improvement in hardness, and a 15% enhancement in impact resistance compared to conventional metal matrix composites (MMCs). Additionally, the composites demonstrated a 10% improvement in thermal conductivity, making them suitable for applications requiring efficient heat dissipation. The successful incorporation of recycled materials not only promoted sustainability but also reduced production costs. The findings underscore the potential of these hybrid composites for high-performance applications in automotive, aerospace, and thermal management industries. Future research should explore the use of other recycled materials and further optimization of casting parameters to enhance composite performance.
Innovative Energy-Efficient Solutions for Sustainable Development in Nigeria's Construction Industry Unegbu, Hyginus Chidiebere Onyekachi; Yawas, Danjuma S.; Dan-asabe, Bashar; Alabi, Abdulmumin Akoredeley
JURNAL MECHANICAL Vol 15 No 2 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i2.5268

Abstract

The construction industry in Nigeria, like many developing countries, faces significant challenges and opportunities in adopting energy-efficient technologies. This study provides a comprehensive analysis of the current state of energy-efficient technologies in Nigeria's construction sector, examining adoption rates, perceived barriers, benefits, and recommendations for enhancing energy efficiency. Data were collected from 50 survey respondents and 15 in-depth interviews with key stakeholders, including architects, engineers, policymakers, and construction managers. The findings reveal that solar panels, LED lighting, and energy-efficient HVAC systems are the most commonly adopted technologies. Regression analysis indicates that regulatory support and stakeholder awareness are significant predictors of technology adoption, while financial constraints, regulatory challenges, and a lack of technical expertise are primary barriers. The thematic analysis highlights the interplay between economic incentives, regulatory environments, and cultural attitudes in influencing adoption. Operational cost savings, enhanced environmental sustainability, and improved indoor environmental quality are identified as major benefits of adopting energy-efficient technologies. The study provides several recommendations, including strengthening regulatory frameworks, providing financial incentives, enhancing capacity-building programs, conducting public awareness campaigns, and improving supply chains for green materials. This research contributes to the understanding of sustainable construction practices in Nigeria and offers practical strategies for overcoming barriers to the adoption of energy-efficient technologies. The findings have important implications for policymakers, industry stakeholders, and researchers aiming to promote sustainability in the construction sector.
Hardness enhancement of Al-Si alloys from sand casting with runner variations Tsamroh, Dewi Izzatus; Ardiansyah, Mochammad Fachrizal; Yaqin, Mohammad Ainul; Shiddiqy, Taqiyyudin Ahmad As; Lubis, Didin Zakariya
JURNAL MECHANICAL Vol 15 No 2 (2024): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v15i2.5280

Abstract

Metal casting is one of the oldest and most efficient manufacturing techniques in producing metal components with complex shapes. One of the main challenges in the casting process is controlling the flow of molten metal so that it can fill the mold perfectly without producing defects. The channel in the casting mold is usually called a runner. The runner functions as a distribution channel for molten metal into the mold cavity. Optimal runner design settings are very important to prevent defects in the final product such as porosity, cold shut, and shrinkage. This study aims to identify the effect of runner shape variations on the quality of Al-Si casting. The method used in this study is a laboratory experimental method. The study began with preparing the tools and materials, the materials used in this study were used pistons. The piston melting temperature was carried out at 750°C. The results showed that the results of the cast product using a truncated cone-shaped runner (variation 1) were the best results. Macrostructural analysis showed that specimens in variation 1 had minimum casting defects and lower shrinkage compared to variation 2. Microstructural analysis showed that the cast product produced several phases. Meanwhile, the hardness number for specimen variation 1 reached 98 HRE.
Spiral Bevel Gears: Review on Dynamics. Samani, Farhad S.; Rakhshani, Shakiba; Estahbanati, Mahdi; Saberi, Shaghayegh; Molaie, Moslem
JURNAL MECHANICAL Vol 16 No 1 (2025): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v16i1.5454

Abstract

Bevel gears are a type of gears commonly used in various applications, especially where a change in the direction of power transmission is needed. The teeth on bevel gears are vulnerable to various defects that can affect their performance, such as pitting, wear, and chipping. These defects can lead to increased vibrations, noise, and decreased efficiency of the gear system. In order to ensure optimal performance and longevity of bevel gears, it is essential to properly diagnose and address any defects on their teeth. The paper investigates the dynamics of bevel gears under varied operational conditions and analyzes the impact of factors, such as crowning modification, on system transmission error. This research explores load-sharing concepts, detailing operational conditions and mathematical models for calculating load-sharing among planets. Moreover, it evaluates factors influencing load distribution among planets, emphasizing parameters like bearing, backlash, run-out errors, position errors, and manufacturing errors while assessing PGS effectiveness in load-sharing. To enhance load-sharing, including floating systems and flexible pins, methods and solutions are discussed. PGS is examined from a phasing perspective. Additionally, this paper summarizes studies on the impact of faults on the planet phase.

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