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Yanuar Burhanuddin
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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 239 Documents
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Analisa keausan dan evaluasi produktivitas serta efisiensi operasional hammer crusher pada area crusher & raw mill di Pabrik Semen Baturaja II. Lumban Tobing, Abert Anugerah; Badaruddin, Mohammad
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.v16i1.5468

Abstract

PT Semen Baturaja is one of the largest cement producers in Indonesia, located in South Sumatra. This company produces various types of cement to meet market needs in the Sumatra region and surrounding areas. In the production process, PT Semen Baturaja Tbk uses a crushing tool to reduce the scale of the materials to be used, one of which is limestone or limestone found in the crusher and raw mill areas. A hammer crusher is an important tool in the cement production process, which functions to hit the material so that it is crushed into smaller sizes. Hammer wear and productivity greatly determines the results of the cement production process. The wear that occurs in this hammer crusher is abrasion wear. In terms of hammer crusher productivity from January to July, the highest value was obtained in March, namely 680.05 tons/hour and the lowest productivity value was in February, namely 547.16 tons/hour. Regarding the efficiency of the hammer crusher, it can be seen that the hammer crusher has a very good efficiency value of 81.48%.
Investigating Environmental Degradation of Banana-Sisal Epoxy Composites: Physical and Thermal Properties Unegbu, Hyginus Chidiebere Onyekachi; YAWAS, Danjuma S.; Dan-asabe, Bashar; Alabi, Abdulmumin Akoredeley
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.v16i1.5500

Abstract

This study evaluates the environmental degradation of banana-sisal epoxy composites, focusing on their physical and thermal properties after exposure to moisture, ultraviolet (UV) radiation, and thermal aging. Alkali-treated and untreated composites were fabricated and tested for moisture absorption, tensile strength, flexural strength, thermogravimetric stability, and UV resistance. Results indicate that alkali-treated composites absorbed significantly less moisture (1.26%) than untreated composites (2.62%) after 120 hours of water immersion. Treated composites retained 87.6% of their initial tensile strength and 92% of their flexural strength, demonstrating superior mechanical performance compared to untreated composites. Thermogravimetric analysis (TGA) showed higher onset degradation temperatures (Tonset = 275°C) for treated composites compared to untreated composites (Tonset = 255°C) and better residual mass retention at 600°C. Differential scanning calorimetry (DSC) revealed a higher glass transition temperature (Tg = 93°C) for treated composites, indicating improved thermal stability. After 100 hours of UV exposure, treated composites retained 82% of their tensile strength, compared to 68% for untreated composites. These findings demonstrate that alkali-treated banana-sisal epoxy composites possess enhanced resistance to environmental degradation, making them viable for use in construction, automotive, and marine industries. Future research should aim to optimize fiber treatments, develop hybrid and nanocomposites, and conduct long-term durability and sustainability assessments.
Analisa Getaran Mesin Milling 1217 Horizontal Terhadap Pengaruh Variasi Kedalaman Potong Pada Proses Pembuatan Roda Gigi Zaira, Jupri Yanda
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.v16i1.6041

Abstract

Seiring perkembangan teknologi, mesin frais (milling) semakin dibutuhkan dalam produksi dan pendidikan. Penelitian ini menganalisis pengaruh variasi ketebalan pemakanan dan diameter cutter terhadap getaran yang terjadi selama proses pemakanan muka. Variasi ketebalan pemakanan yang digunakan adalah 0,5 mm, 1 mm, dan 1,5 mm, dengan diameter cutter 55 mm. Pengukuran getaran dilakukan menggunakan vibration tester VM-6380 pada tiga arah (vertikal, horizontal, dan aksial), menghasilkan data berupa displacement, velocity, dan acceleration yang diolah menjadi amplitudo. Hasil penelitian menunjukkan amplitudo terbesar terjadi pada arah horizontal dengan kedalaman pemakanan 0,5 mm menggunakan cutter diameter 55 mm pada kecepatan 125 rpm sebesar 0,1153 mm. Pada arah aksial, amplitudo tertinggi tercatat sebesar 0,0453 mm pada kedalaman 1 mm, dan pada arah vertikal amplitudo terbesar adalah 0,0492 mm pada kedalaman 1,5 mm. Kesimpulan menunjukkan bahwa amplitudo terbesar secara umum terjadi pada arah horizontal dengan ketebalan pemakanan 0,5 mm. Penelitian ini memberikan wawasan penting mengenai pengaruh parameter pemakanan terhadap getaran, yang dapat membantu optimalisasi proses milling.
STUDY OF DIFFERENT WINGLET CONFIGURATION IN CEILING FAN TO IMPROVE THE AIR FLOW IN CUBIC ROOM KARTHIKEYAN, ARTHANARI
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.v16i1.6517

Abstract

Winglet attachment is reducing the induced drag in aircraft; similar concept is tried in ceiling fan, in order to reduce the tip vortices which increase the fan speed and airflow and reduce the electricity consumption. Various shape of winglet attachment such as blend edge, sharp edge, wedge shape, triangle.  The air flow was experimentally measured at various locations in various speeds and results were finally discussed. There is a considerable  improvement in airflow as compared to without attachment of winglet
OPTIMIZATION OF HYBRID POWER PLANT DESIGN ON BANGKURUNG ISLAND USING MULTI CRITERIA ANALYSIS Muhammad Ma'sum Sidiq
JURNAL MECHANICAL Vol 17 No 1 (2026): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

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Abstract

Bangkurung Island is a remote area in Southeast Sulawesi that is electrified for 8 hours per day by a dieselgenerator with a supply capacity of 850 kW and a peak load of 466 kW. This study aims to analyzeelectricity generation by utilizing local renewable energy-based hybrid plants that can meet demand for 24hours per day. For this reason, 5 alternative Planning design schemes are proposed: first 100% PLTDcomposition, second PLTD+PV+Li-ION, third PLTD+WT+Li-ION, fourth PLTD+PV+WT+Li-ION, andfifth PV+WT+Li-ION. Based on the simulation results of the HOMER application for the five schemesabove, multi criteria decision making is carried out to determine the best alternative scheme based onseveral criteria using the TOPSIS (Technique of Preference by Similarity to Ideal Solution) method, theresults obtained in the fourth scheme with the highest value and has a Cost of energy (COE) value of US $0.105 / kWh. Although the results of the financial feasibility analysis study which includes Net PresentValue (NPV), Profitability Index (PI), and Internal Rate of Return (IRR) are not feasible. Based on theeconomic analysis of the best hybrid scheme, the usual fuel savings of US$ 597,239.21 / year and theenvironmental aspects of reducing CO2 emissions by 1.99 tons / year and reducing waste treatment effortsfrom diesel power plants.
Effect of dehydrogenation holding time after black oxide coating on AISI 4340 steel on mechanical properties: Pengaruh waktu penahanan dehidrogenasi setelah pelapisan black oxide pada baja AISI 4340 terhadap sifat mekanik Adinda Fadhila; Devi Eka Septiyani Arifin
JURNAL MECHANICAL Vol 17 No 1 (2026): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

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Abstract

In the automotive industry, especially in labor-intensive industries such as PT XYZ which produces all components independently, the black oxide coating process is often applied to improve corrosion resistance, especially on AISI 4340 steel. However, this process has the potential to cause hydrogen embrittlement phenomena due to immersion in chemical solutions. One method to overcome this problem is the dehydrogenation (baking) process, which is thermal heating to remove hydrogen and restore the mechanical properties of the material. This study aims to analyze the effect of black oxide coating without dehydrogenation process and variation of dehydrogenation holding time on mechanical properties of AISI 4340 steel, including tensile strength, hardness, and oxalic acid drop test. The dehydrogenation process variation consists of specimens without dehydrogenation, as well as specimens with dehydrogenation process for 3 hours and 4 hours at 190±14°C. The test results show that the increase in dehydrogenation holding time is directly proportional to the increase in tensile strength and hardness of the material. The percentage increase in tensile strength between the 3-hour and 4-hour specimens reached 2.64%, while the increase in hardness was 3.96%. Specimens without dehydrogenation process showed lower tensile strength and hardness values.
Evaluation of renewable energy from rice husk waste potential in Bali Island I Gede Bawa Susana; I Gede Santosa
JURNAL MECHANICAL Vol 17 No 1 (2026): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

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Abstract

This study evaluates the potential of rice husk waste as a renewable energy source in Bali Island. Based on rice husk production data of 127,095 tons per year and an average calorific value of 14 MJ/kg, the estimated energy potential reaches 494,258,728.74 kWh per year. This amount is sufficient to meet the electricity needs of approximately 41,188 households, assuming an average consumption of 100 kWh per month. The evaluation results indicate that rice husks have strategic value as a local biomass resource that can be utilized through various technologies, such as direct combustion, gasification, and biomass briquetting. In addition to reducing dependence on fossil fuels, this utilization supports sustainable agricultural waste management. Therefore, an integrated approach involving policy support, appropriate technology, and community engagement is essential to effectively and sustainably implement energy utilization from rice husk waste in Bali and other agricultural regions in Indonesia.
Tailoring epoxy resin impact performance by varying coconut coir fiber reinforcement Muhammad Budi Haryono; Hisyam Ma'mun; Aan Burhanuddin; Muhammad Faesal Febriandyono; Joko Yulianto
JURNAL MECHANICAL Vol 17 No 1 (2026): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

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Abstract

Epoxy resin generally exhibits low impact toughness and tend to be brittle when subjected to high load impacts. Indonesia in an archipelagic country that has abundant coconut plants. The purpose of this study is to utilize coconut coir fiber waste as an alternative to improve the impact toughness of epoxy resin. Therefore, this research uses coconut coir fiber as a reinforcement in epoxy resin matrix composites, varying the volume fraction of coconut coir fibers from 0% to 50%. The results show that increasing the volume fraction of coconut coir fiber from 0% to 50% decreases the mass of the epoxy resin but increases its impact toughness. The epoxy resin mass decreases from 11.0±0 grams to 9.3±0.6 grams, while the impact toughness increases from 0.027±0.01 J/mm2 to 0.075±0.02 J/mm2.
Studi Numerik Aerodinamika Turbin Angin Kontra Rotasi Berdasarkan Variasi Jarak Terhadap Rasio Putaran Rotor Akhmad Riszal; Agus Sugiri
JURNAL MECHANICAL Vol 17 No 1 (2026): JURNAL MECHANICAL
Publisher : Fakultas Teknik, Universitas Lampung

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Abstract

Counter Rotating Wind Turbine (CRWT) is one of the developments of horizontal axis wind turbines that utilize two rotors rotating in opposite directions to increase the efficiency of wind energy conversion. This study aims to analyze the aerodynamic characteristics of CRWT using the Computational Fluid Dynamics (CFD) method by studying the effect of variations in the distance between the rotors on turbine performance. The blade model used consists of three blades using the S826 airfoil from the National Renewable Energy Laboratory (NREL). Simulations were carried out using the Moving Reference Frame (MRF) method with the Realizable k-ε turbulence model. The variations analyzed include the distance between the rotors Z/D₁ of 0.25 and 1 at a rotor rotation ratio of 0.6 with a Tip Speed ​​Ratio (TSR) of 6. The simulation results show that the CRWT configuration produces a higher power coefficient than a single rotor turbine. The maximum power coefficient value obtained reaches around 0.52 or an increase of 14.61% compared to the Single Rotor Wind Turbine (SRWT). The flow velocity distribution shows that the distance between the rotors affects the wake interaction and energy distribution on the rear rotor. The configuration with a distance of Z/D₁ = 0.25 produces a more uniform flow distribution, thus improving aerodynamic performance, while the distance of Z/D₁ = 1 shows a greater wake interaction so that the rear rotor efficiency decreases slightly. The results of this study indicate that optimizing the inter-rotor distance is an important parameter in improving the performance of CRWT under the same operating conditions.

Page 24 of 24 | Total Record : 239

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