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Tulus Burhannudin Sitorus
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Faculty of Engineering, University of Sumatera Utara J17 Building 3rd Floor Mechanical Engineering Department Jl. Almameter Kampus USU Medan Telp.061-8213250, Fax 061-8213250
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Dinamis
Published by TALENTA PUBLISHER
ISSN : 02167492     EISSN : 28093410     DOI : https://doi.org/10.32734/dinamis
Core Subject : Science, Education, Engineering,
Education Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
Focus and Scope Dinamis Journal is a national electronic journal as a means to publish scientific works in Mechanical engineering and other relevant fields. This journal has strengths and focuses on the sub-fields of energy conversion, structural materials and materials engineering, production processes, and maintenance systems which are all part of mechanical engineering science. This journal is managed by the Department of Mechanical Engineering, Faculty of Engineering, University of Sumatera Utara. Scientific works published in the Dinamis Journal are the results of research, both experimental, literature reviews, and simulations and contribute significantly to the development of science and technology. The Dinamis Journal publishes scientific papers in the field of Mechanical engineering related to the following fields of study: Experimental and Computational Mechanical Systems Solar Energy Fuel Cell Noise and Vibration Alloy and Processing
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 237 Documents
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Effect of Intake Valve Gap Adjustment Variation on Fuel Consumption in Daewoo 4dwy-30 Diesel Motorcycle Eko Julianto; Fuazen; Prayoga, Yongki; Iwan, Muhammad; Gunarto; Sarwono, Eko; Yunus Nasution, Ahmad
DINAMIS Vol. 12 No. 1 (2024): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v12i1.16369

Abstract

The valve mechanism system on a 4 stroke diesel motor functions as an opening or closing mechanism which is used as a way for air to enter the combustion chamber or as an outlet for residual combustion gases from the combustion chamber. To maximize diesel engine performance, valve clearance adjustments need to be carried out periodically. This research aims to determine the effect of variations in intake valve gap adjustment on fuel consumption on the Daewoo 4 DWY-30 diesel motorbike. This research uses experimental methods and is quantitative research, namely presenting the results of experiments in the laboratory on test objects. The research results show that there is an influence of variations in intake valve gap adjustment on fuel consumption. The highest fuel consumption is at the intake valve gap setting of 0.20 mm, and the lowest fuel consumption is at the intake valve gap setting of 0.60 mm.
Investigation of Static Flexural Strength of Aluminium Honeycomb Panels with Varying Cell Sizes Siregar, Rakhmad Arief; Yusuf Siahaan, Muhammad Yusuf Rahmansyah Siahaan
DINAMIS Vol. 12 No. 1 (2024): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v12i1.16418

Abstract

In this paper, the static flexural strength of aluminium honeycombs with varying cell sizes were tested experimentally using three-point bending method. Three different cell sizes, namely 2 mm, 4 mm and 6 mm, which were produced in a local workshop in the city of Medan, were used for this study. The main focus is to observe the maximum load and permanent deflection under static loads. The results show that the fracture mode that occurs after reaching the maximum load is core fracture followed by rupture of the adhesive between the core and the skin sheet. It is found that cell size has a significant influence on the maximum flexural strength of honeycomb panels which can be approximated by a regression curve with the results a1 = 0.3475 and a0 = 1.51.
Effectiveness of Reducing GHG Emissions With Fuel Conversion in Gas and Steam Power Plant PT PLN UPDK Belawan, North Sumatera Suryati, Isra; Zulkarnain, Randy; Utami, Rahmi; Siregar, Naomi Febriyanti; Suyanto
DINAMIS Vol. 12 No. 1 (2024): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v12i1.16524

Abstract

Gas and Steam Power Plant (PLTGU) PT. PLN (Persero) Belawan Generation Control Implementation Unit (UPDK) is the main supplier of electricity needs in the Northern Sumatra System. In the initial period of operation, PLTGU PT. PLN UPDK Belawan uses diesel oil as fuel. The use of fuel originating from the bowels of the earth certainly produces greenhouse gas (GHG) emissions. Since 2015, this PLTGU has started using natural gas as fuel. Changes in fuel use will affect the GHG emission load resulting from the Belawan PLTGU. This research aims to analyze the GHG emission load from the two types of fuel and examine the differences in GHG emissions when the conversion of diesel fuel to natural gas occurs. The emission load calculation uses the IPCC method and guidelines from the Ministry of Energy and Mineral Resources with national emission factors, meanwhile, to carry out real difference tests using the WSR test from SPSS. The results of the emission load calculation show that there is a difference in the greenhouse gas emission load produced before using natural gas fuel and when using natural gas fuel of 20.85%. This shows that fuel conversion from diesel oil to natural gas can reduce the burden of household gas emissions
The Influence of Steel Wool Fiber Length on The Characteristics of The Particle Board Ramadhan, Fikri; Ula, Shofiatul; Sunardi
DINAMIS Vol. 12 No. 1 (2024): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v12i1.16532

Abstract

The use of wood powder can be reduced by a mixture of cinnamon, bamboo powder, and steel wool as a filling of the composite particle board. The length of steel wool in this study was determined by the size, i.e. 2, 4, and 6 mm. The composite composition comparison was 30% cinnamon powder, 30% bamboo Powder, 1% wool steel, 29% PVAc, and 10% epoxy resin. Compression process using the cold press single punch method for 2 hours then post curing process at a temperature of 150 oC for 1 hour. The results of this study show that steel wool length influences the characteristics of the particle board, both physical properties, mechanical properties, and morphological structure.
The Density Value of Mixing Water and Cooking Oil Using an Emulsifier (Tween 20) Budhi Rahardja, Istianto; Basyir Rantawi, Azhar; Saputra, Hendra; Oktavia Pambudi, Dian; Naufal Rangga Gumilang, Raden; Afni Safitri, Nur; Mahadewa, Mirza; Meutia Tari, Eka; Ilmar Ramadhan, Anwar; Susanto, Edy
DINAMIS Vol. 12 No. 1 (2024): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v12i1.16567

Abstract

Water and cooking oil are fluids that we often encounter in our daily lives and are often needed. Water is polar while cooking oil is non-polar, so in uniting the two fluids an emulsifier (Tween 20) is used to mix them. The aim of this research is to combine polar and non-polar fluids. Emulsifier (Tween 20) is used as a polysorbate surfactant (mixing agent) for the two fluids and can mix perfectly. The combined water and oil are mixed using a mixing stirrer with a speed of 100-200 rpm, a temperature of 70⁰C, within 1 hour. To obtain a fluid density value by providing heating from 30⁰C-90⁰C, then inserting it into a 25 ml volumetric flask and weighing it. After mixing, a white hybrid fluid will be produced, and it will separate again when the fluid is at room temperature.
Analysis of Deflector Variations to Improve Performance and Determine the Force of the Darrieus Turbine Using CFD Software Susanto, Edy; Arie Hadiansyah, Muhammad; Sinambela, Hotdian; Erwin, Erwin
DINAMIS Vol. 13 No. 1 (2025): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v13i1.18833

Abstract

This research focuses on developing deflectors to improve the performance of Darrieus turbines, a type of vertical wind turbine known for its efficiency in the conversion of wind energy into mechanical energy. The main objective of this research is to test different deflector shapes to optimize the airflow entering the turbine blades and improve the efficiency and power output of the turbine. In this study, various deflector designs including semicircular, triangular, rectangular, hexagonal, and pentagonal shapes were examined to determine their effectiveness in directing and accelerating airflow to the turbine blades. The research method involved aerodynamic simulations using CFD software. The results showed that the semicircular-shaped deflector provided significant performance improvement compared to the other shapes. These deflectors successfully reduced turbulence and drag, and accelerated the airflow entering the turbine blades, thereby increasing the overall power output of the Darrieus turbine. In addition, the analysis shows that at 17.5, 10.5, and 8.5 m/s calculations, at 8.5 m/s wind speed calculation, the air speed can reach 30.1% with a force of 7.30344 N, and 10.5 m/s speed can reach 24.33% with a force of 11.361 N, and 17.8 m/s wind speed can reach 20.67% with 25.638 N force.
Power Optimisation of Centrifugal Pumps in a 4-Storey Building Effendi, Riki; Rijal Siswanto, Ahmad; Qadri, Munzir; Hendra, Franka; Yunus Nasution, Ahmad
DINAMIS Vol. 13 No. 1 (2025): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v13i1.18837

Abstract

The optimization of water distribution systems in high-rise buildings is essential for enhancing energy efficiency and reducing operational costs. This study examines the effects of implementing a Variable Frequency Drive (VFD) on a centrifugal pump system within a four-storey high-rise building at PT SBA. A case study approach was employed to measure key operational parameters—namely, electrical power consumption, water flow rate, and pressure distribution—both before and after VFD installation. The experimental results demonstrate that the VFD application resulted in a 20% reduction in power consumption, decreasing from 3.5 kW to 2.8 kW, while the water flow rate improved by 12.5%, rising from 80 LPM to 90 LPM. In addition, the pressure range was significantly stabilized, narrowing from 1.2–2.5 bar to 1.0–2.0 bar across the building’s floors. An economic analysis based on the observed energy savings indicates an annual cost reduction of approximately Rp7,665,000, with a corresponding return on investment achieved in less than one year. The findings suggest that integrating VFD technology into centrifugal pump systems not only enhances operational efficiency and extends equipment lifespan by mitigating load fluctuations but also offers substantial economic benefits. This study provides a robust framework for the broader application of VFD-based optimization strategies in high-rise and industrial water distribution systems.
Analysis of the Effect of Blade Washing Compressor on Compressor Efficiency and Thermal Efficiency of Gas Turbine at PLTG XXX Susanto, Edy; Sinambela, Hotdian; Tri Khairullah, Rafi
DINAMIS Vol. 13 No. 1 (2025): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v13i1.18846

Abstract

The most important parts of a gas power system are the compressor and gas turbine. Compressor performance will naturally decrease due to high ambient temperatures and dirt in the incoming air and make the compressor inefficient. To restore compressor efficiency, it is recommended to clean the compressor using the compressor blade washing method. The purpose of this study was to determine the compressor blade washing procedure used in the PLTG system and determine the parameters tested and analyses their effect on the thermal efficiency of the PLTG. This study was conducted on a PLTG unit operating at a load of 120 MW or 50% of the installed capacity, with research stages including data collection, calculation of the gas turbine heat rate, calculation of the thermal efficiency of the PLTG cycle and calculation of compressor efficiency. From the implementation of the compressor blade washing carried out, there was an increase in compressor efficiency of 2.62% and after the compressor blade washing caused a decrease in the heat rate of 853 kJ / kWh, so that there was an increase in the thermal efficiency of the PLTG of 1.74%.
Retort Kiln Carbonization of Wet and Dry Young Coconut Wastes: Effects on Biochar Quality and Processing Efficiency Mufti, Rijalul; Setiawan, Adi; Dabet, Abubakar; Alchalil, Alchalil; Absa, Munzir; Iqbal, M.
DINAMIS Vol. 13 No. 1 (2025): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v13i1.19748

Abstract

Peningkatan konsumsi kelapa di Indonesia telah menyebabkan akumulasi limbah tempurung kelapa muda yang masih belum dimanfaatkan secara optimal, padahal memiliki potensi sebagai sumber energi terbarukan. Penelitian ini bertujuan mengembangkan strategi karbonisasi yang efektif menggunakan retort kiln untuk menghasilkan bioarang berkualitas tinggi. Metode eksperimen dilakukan dengan dua perlakuan kadar kelembapan bahan baku (basah dan kering), dikarbonisasi pada suhu 400°C menggunakan reaktor retort kiln skala pilot, dengan pengeringan awal pada bahan basah selama 3 jam kemudian dilanjutkan pemanasan selama 5 jam. Hasil penelitian menunjukkan peningkatan kandungan karbon tetap dari 56,25% menjadi 62,32% dan nilai kalor dari 5537 cal/g menjadi 6376 cal/g ketika bahan baku basah dikeringkan di reaktor sebelum proses karbonisasi, sementara konsumsi bahan bakar tercatat sebesar 1,636 L/kg untuk bahan baku basah dan 1,076 L/kg untuk bahan baku kering. Temuan ini membuktikan bahwa pengeringan awal pada proses karbonisasi limbah kelapa muda basah secara signifikan mempercepat produksi bioarang dan meningkatkan kualitas produk, sehingga mendukung pemanfaatan limbah biomassa pertanian melalui teknologi retort kiln secara lebih efisien dan berkelanjutan.
Combustion Performance of Torrefied Coffee Parchment Briquettes: Effects of Particle Size and Briquetting Pressure Juwaini; adi setiawan; Muhammad
DINAMIS Vol. 13 No. 1 (2025): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v13i1.19759

Abstract

A substantial amount of coffee plantation waste is generated in Aceh highland, yetits utilization remains limited. Most of the wastes are dumped on the ground, whilecoffee parchment is often burned without further application. This study exploresthe conversion of coffee parchment into briquettes, focusing on their combustioncharacteristics. The parchment were subjected to torrefaction process attemperatures ranging from 240°C to 270°C and then ground to particle sizes of 40,60, and 80 mesh. Briquettes were formed using 10% tapioca flour as a binder andcompressed simultaneously for 20 pieces of briquettes at pressures of 300, 400,and 500 kg/cm². The resulting briquettes, with dimensions of 37×28×28 mm,exhibited a density of 0.63 g/cm³ and a combustion rate of 0.37 g/min, enabling aburn duration of up to 105 minutes and a peak temperature of 435°C. The bestperformance was achieved using a particle size of 60 mesh and a compactionpressure of 400 kg/cm². These findings demonstrate the potential of coffeeparchment as a viable source of solid fuel for heating applications.

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