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Teknomekanik
Published by Universitas Negeri Padang
ISSN : 26219980     EISSN : 26218720     DOI : 10.24036/tm.
Core Subject : Engineering,
Mechanical Engineering
Teknomekanik is an international journal that publishes peer-reviewed research in engineering fields (miscellaneous) to the world community. Paper written collaboratively by researchers from various countries is encouraged. It aims to promote academic exchange and increase collaboration among scientists, engineers and researchers to support sustainable development goals.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 174 Documents
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The effect of T6 heat treatment on the tensile, impact, and fatigue properties of Al6061-fly ash composites Zainun Achmad; Al Emran bin Ismail; Harjo Seputro; Eka Marliana
Teknomekanik Vol. 9 No. 2 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v9i2.50672

Abstract

This study investigates the effect of controlled precipitation hardening on the mechanical behavior of Al6061–fly ash metal matrix composites fabricated using stir casting and subjected to T6 heat treatment. The specimens underwent solution treatment at 510°C for 1 and 2 hours, followed by oil quenching and artificial aging at 120°C, 140°C, and 160°C for 2 hours. Tensile, Rockwell hardness, impact, and fatigue tests were used to assess the mechanical characteristics, in accordance with ASTM standards, and were supported by microstructural and SEM studies. The findings indicate that T6 treatment greatly improves strength and fatigue tolerance compared with the untreated state. The highest tensile strength and impact energy were achieved under the T6-A2 condition (510 °C for 2 h + aging at 120 °C for 2 h), whereas the longest fatigue life was obtained under the T6-B1 condition (510 °C for 1 h + aging at 140 °C for 2 h). This shows a good balance between strength and toughness, which is related to the formation of fine Mg2Si precipitates and enhanced interfacial bonding. Aging at 120°C resulted in the highest hardness at 510°C (2 hours). Over-aging reduced ductility and impact resistance because of precipitate coarsening. For durable aluminum–fly ash composites, these results show a distinct link between processing, microstructure, and material characteristics.
Flow-rate estimation in PVC and carbon-steel pipes using flow-induced vibrations and data-driven models Khalid Alnabhani; Musaab Zarog; Hadj Bourdoucen
Teknomekanik Vol. 9 No. 2 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v9i2.53072

Abstract

Non-intrusive flow measurement methods are increasingly required in pipeline systems to eliminate pressure losses, prevent contamination, and avoid structural modifications. Flow-induced vibration (FIV) offers a promising alternative; however, its applicability to standard industrial carbon-steel pipelines and its integration with data-driven modeling remain limited. This study experimentally investigates FIV-based flow estimation in 1-inch PVC and carbon-steel pipes conveying water under controlled conditions using regression, and machine learning models, while examining the influence of pipe material and vibration-response characteristics on flow-rate prediction performance. Vibration responses were measured using a tri-axial accelerometer and analyzed to identify flow-sensitive frequency bands. Regression and machine-learning models were developed to relate vibration characteristics to flow rate. The results demonstrate a predominantly monotonic relationship between band-averaged vibration amplitude and flow rate, with material-dependent sensitivity observed between PVC and carbon-steel pipes. Data-driven models improved prediction performance and robustness on the dynamic behavior of flow-induced vibrations, The findings demonstrate the potential of combining FIV analysis with intelligent modeling as a non-intrusive approach for flow measurement in industrial pipelines. Neural time-series modeling was used for training purpose only. Open-loop training provides a stable and efficient way for the network to learn the underlying dynamic relationship between inputs and outputs. A meaningful assessment of the model's predictive capability requires closed-loop testing, where the network relies on its own previous predictions. This was not conducted in the present study.
CFD-based Taguchi optimization of impeller geometry to improve centrifugal fan efficiency Delima Yanti Sari; Bagas Santoso; Hendri Nurdin; Hastuti Hastuti; Rifelino Rifelino; Fitrah Qalbina; Tsung-Liang Wu; Dani Harmanto
Teknomekanik Vol. 9 No. 2 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v9i2.53772

Abstract

Centrifugal fans play a significant role in industrial ventilation systems. Their performance is affected by aerodynamic losses such as flow separation and non-uniform pressure distribution, thereby reducing the overall efficiency. Since design parameters influence the fan efficiency, design parameter optimization becomes one option for addressing this issue. Some optimization methods involve high computational cost and complex procedures. This raises the necessity for a more efficient and systematic optimization procedure. The aim of this study is to propose an integrated approach which involves Computational Fluid Dynamics (CFD) and the Taguchi method to improve the performance of a centrifugal fan. CFD is used to evaluate the performance of different design combinations, while the Taguchi method is used to optimize design parameters. The investigated design parameters are the inlet blade angle (β1), the outlet blade angle (β2), the number of blades (n), and the flow rate (Q). Each of the design factors has three levels, therefore, an L9 orthogonal array was utilized as the design of experiments. Analysis of variance (ANOVA) is used to determine their relative significance. The results show that the optimal combination of design parameters increase the efficiency from 39.79% (the reference) to 63.26%. The CFD simulations for the optimal combination exhibit the improved flow behaviour, which explains the enhanced efficiency. The results show the feasibility of the proposed method for improving the performance of the centrifugal fan.
Component-wise exergy loss analysis under injection timing and EGR variations in a heavy-duty diesel engine Eihab A. Raouf Mustafa
Teknomekanik Vol. 9 No. 2 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v9i2.54472

Abstract

This study investigates the component-wise exergy behavior of a heavy-duty diesel engine under combined variations in injection timing and exhaust gas recirculation (EGR). A calibrated Diesel-RK model was used to simulate steady-state operation over a representative speed-load range. Fuel, brake, exhaust, wall heat, and destruction exergy terms were then evaluated using a consistent post-processing framework. The results showed that increasing EGR from 0 to 0.20 reduced the brake exergy fraction from 33% to 14%. In comparison, the destruction fraction increased from 44% to 73%, indicating that dilution intensified combustion-related irreversibility with a greater influence on irreversibility than on wall heat transfer. Across the investigated speed-load range without EGR, destruction typically remained within about 39–45% of fuel exergy. Advancing injection timing shifted heat release toward top dead center and redistributed wall heat exergy from the liner (40% to 26%) toward the piston and cylinder head, with contributions increased to approximately 37–40% each. At high load, moderate advancement improved thermodynamic efficiency, whereas excessive advancement increased wall thermal loading and reduced further gains. At part load, sensitivity increased because combustion duration appeared to influence thermal response more strongly than peak temperature. A limited trade-off region was identified in which exergy efficiency exceeded about 30%, and destruction dropped below roughly 45%, primarily at advanced timing and high load. However, excessive injection advancement resulted in physically infeasible EGR operation due to insufficient exhaust pressure to sustain recirculation flow, thereby defining a practical operating boundary. Injection timing affected not only efficiency but also whether EGR could function, therefore, optimal calibration must balance combustion phasing, dilution-induced irreversibility, and component-level thermal loading.
Hydrodynamic optimization of a Sweptback Stern Foil for resistance reduction in flat-hull ships: A CFD-based extension of the Hull Vane concept Rahmat Azis Nabawi; Budi Syahri; Yogi Dian Alfana; Donny Fernandez
Teknomekanik Vol. 9 No. 1 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v9i1.54872

Abstract

Flat-hull ships are known to have higher resistance than streamlined hulls. Although the Hull Vane® concept has been proven effective as a stern-mounted energy-saving device through pressure-field modification and stern-wave interaction, most previous studies have focused on straight-foil configurations (straight planform). The effect of planform shape optimization, particularly the sweptback configuration, on the hydrodynamic performance of flat-hull ships is limited in the literature. This study modifies the geometry of a Hull Vane® into a sweptback stern foil and evaluates its performance using Computational Fluid Dynamics simulations. The results show that a 15° sweptback angle yields the greatest reduction in total drag. Velocity contour analysis shows a narrower wake and a more uniform velocity-gradient distribution in the stern area for the 15° swept-back stern-foil configuration compared to other configurations. Meanwhile, the turbulence length distribution shows a tendency toward reduced intensity of large-scale turbulent structures behind the ship, indicating improved wake-flow characteristics. The identified drag reduction mechanism primarily stems from improved pressure recovery and modified pressure distribution in the stern area, which is consistent with the working principle of Hull Vane®. Optimizing the sweptback planform geometry yields more efficient flow interaction than the straight-foil configuration. These findings indicate that planform optimization is an important design parameter in the development of stern foils to improve the hydrodynamic efficiency of medium-to high-speed commercial vessels.
Material selection for raw gas pipeline at SBR#2 gas field Rado Riady; Johny Wahyuadi Soedarsono; Rini Riastuti; Iman Adipurnama
Teknomekanik Vol. 5 No. 2 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v5i2.13372

Abstract

In engineering design, material selection is the process of choosing the best material for a specific process via a systematic material selection approach. This article described the material selection process for SBR#2 pipeline, which will be installed to flow raw gas from SBR#2 field to the nearest tie-in point. The material selection process starts with design requirement analysis to generate primary function and objectives, including its constraints, determine primary criteria to be evaluated, screen materials candidates based on criteria evaluation, and select the most suitable materials based on very specific requirements. The criteria were evaluated by performing value engineering with the performance criteria matrix tool. Materials selection, in this case, was determined by two main criteria: corrosion resistance and construction ability. Corrosion resistance was evaluated semi-quantitatively by applying NORSOK M-506 2005 spreadsheet, and construction ability were evaluated qualitatively based on field experience. Solid Corrosion Resistance Alloy (CRA)-Stainless Steel 316L pipe is the most suitable for this case.
Quality function deployment analysis of smartphones Akhil NSB; Vimal Kumar; Tanmoy De; Suriya Klangrit
Teknomekanik Vol. 5 No. 2 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v5i2.14372

Abstract

To utilize the concept of Quality Function Deployment (QFD) and apply it appropriately to address design decisions concerning the quality of cellular phones, a simplified version of the House of Quality (HoQ) will be built. Real customer requirements (CRs) are easier to collect when QFD is employed because it puts the emphasis on the customer and their demands where it should be. After gathering various users' opinions on different smartphone brands and conducting an online survey with mobile users in Taichung, Taiwan, the study highlights the items preferred by most users, such as long-lasting battery life, high-quality camera, reliability, wide screen, ease of use, and lightweight. This aids businesses in translating CRs into primary Design Requirements (DRs) so that they can create superior goods that align with consumer demands.
Numerical analysis of flow characteristics of the oil-water mixture in stratified-annular horizontal pipe Nelvi Erizon; Jasman Jasman; Irzal Irzal; Muhammad Fikhri Aldio; Aprizal Saputra; Chau Trung Tin
Teknomekanik Vol. 5 No. 2 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v5i2.14572

Abstract

The loss of oil fluid flow in the piping system in the petroleum industry due to friction is the cause of low efficiency. To reduce friction loss, the viscosity of petroleum can be lowered by adding water as a mixture. Actually, the flow loss in a piping system is influenced by several factors including flow pattern, fluid type, flow velocity, flow pressure and pipe diameter. This study aims to determine the effect of flow patterns on changes in velocity in the two-phase flow of oil and water in a piping system. This numerical analysis research was carried out using Fluent 6.2 software with variations in the velocity of the oil-water mixture: 0.2, 0.4 and 0.6 m/s. The simulation results show that the greatest pressure loss occurs at a fluid velocity of 0.6 m/s where the flow is stratified mixed. While the smallest pressure loss at a mixture velocity of 0.2 m/s when the flow is stratified smooth. From the results of the study, it can be concluded that the increase in fluid flow velocity has a positive correlation with the increase in the value of flow losses in the pipe.
The effect of biochemical oxidation on the hydrometallurgical production of copper Aigul Koizhanova; David Magomedov; Nurgali Abdyldayev; Maria Yerdenova; Akbota Bakrayeva
Teknomekanik Vol. 6 No. 1 (2023): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v6i1.16072

Abstract

The article presents the results of the use of the biochemical leaching method for copper-bearing non-commercial ore in a full hydrometallurgical cycle. The object of the study was the average copper-bearing ore of the Satbayev deposit, with an initial copper content of 0.26%. The experimental part of the full hydrometallurgical cycle included percolation leaching, extraction, and re-extraction tests, as well as electrodeposition tests and the production of finished cathode copper. Two variants of percolation leaching were performed as a comparison: a standard method using only sulfuric acid and a preliminary bacterial oxidation method for mineral raw materials with an adapted bacterial strain, Acidithiobacillus ferrooxidans. Percolation leaching experiments showed a significant reduction in sulfuric acid consumption when preliminary bacterial oxidation was used. Upon reaching the level of copper extraction from the ore of 86–87%, the final consumption of sulfuric acid for the standard leaching method was 15.5 kg per ton, while 9.4 kg per ton was required for the biochemical method. The productive solution obtained in the biochemical leaching process showed full suitability for all technological stages of hydrometallurgical copper production.
Cellulose derivative as protection coating: Effect of nanoparticle additives on load capacity Shih-Chen Shi; Xiao-Ning Tsai
Teknomekanik Vol. 5 No. 2 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v5i2.16372

Abstract

The cellulose derivative hydroxypropyl methylcellulose (HPMC) has recently been extensively studied and used in mechanical applications. However, the softness and susceptibility to deformation of HPMC limited its further applications. In this study, metal nanoparticles (nano-aluminum and nano-copper) and nano-metal oxide particles (nano-alumina and nano-copper oxide) were used as additives to HPMC to form a composite film with improved mechanical properties, particularly load capacity. The addition of high levels of additives provided a higher load capacity. Among the nano-additives used in the study, Cu (2 wt.%) provided the composite with the highest load capacity, improving the load capacity of pure HPMC by 250%. The surface treatment of strengthening additives is an important step. Adding specific high-strength and high-modulus metal and metal oxide additives to the soft HPMC matrix can effectively improve the load-bearing capacity of the composite material. This study proposes a simple evaluation method for the load-bearing capability of the coating as well.

Page 13 of 18 | Total Record : 174

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