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Prosiding SNTTM
Published by BKS-TM Indonesia
ISSN : 30321972     EISSN : 26230313     DOI : -
Core Subject : Agriculture, Engineering,
Aerospace Engineering Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Engineering Industrial & Manufacturing Engineering
Prosiding SNTTM merupakan wadah bagi para peneliti dan praktisi tknik mesin untuk berbagi hasil riset, inovasi, serta perkembangan terbaru dalam bidang teknik mesin dan rekayasa. Prosiding menerima berbagai lingkup makalah terbaik dalam berbagai topik bidang teknik mesin, termasuk namun tidak terbatas pada: - Desain dan Manufaktur - Energi dan Konversi Energi - Material Teknik dan Metalurgi - Mekatronika dan Otomasi - Dinamika, Getaran, dan Kontrol - Transportasi dan Teknologi Otomotif - Termofluida dan Rekayasa Panas - Aplikasi Kecerdasan Buatan dalam Teknik Mesin
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 82 Documents
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Analisis kinerja turbin vortex dengan variasi sudu biomimetik berbentuk rumah keong Kurniawan, Iwan; Prayoga, Alfito Dinova; Herisiswanto
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/gbz8f971

Abstract

The demand for renewable energy continues to grow as fossil fuel reserves decline and global energy needs increase. One promising alternative is the vortex turbine, which can operate effectively in low-head regions. This study investigates the effect of blade geometry variations on the performance of a vortex turbine, with a particular focus on curved blades enhanced with spiral-shaped fins inspired by biomimetics. The research was conducted experimentally using three blade types: flat blades, curved blades, and curved blades with additional spiral-shaped fins resembling a snail shell structure. Tests were performed on a laboratory-scale vortex turbine prototype, measuring torque, power, and efficiency. The results showed that the flat blades produced the lowest efficiency (17.6%), the curved blades achieved a moderate efficiency (21.0%), whereas the curved blades with additional spiral-shaped fins reached the highest efficiency (33.01%). The significant improvement observed in the biomimetic blades is attributed to the spiral geometry, which effectively directs the flow, reduces separation, and enhances momentum transfer from the fluid to the blades. These findings demonstrate that the biomimetic approach contributes positively to improving the performance of small-scale vortex turbines, making it a promising solution for renewable energy generation in low-head regions
Manufacturing of duplex stainless steel using local material ferronickel on laboratory scale Bagdja, Ade; Marlina, Riyan
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/n80ed832

Abstract

The study aims to manufacture a duplex stainless steel in laboratory scale using local ferronickel as the main alloying material. The melting process was carried out using the Electric Arc Furnace (EAF) method using three variations of material composition: (1) Fe-Ni 40%, Fe 35%, Cr 25%; (2) Fe-Ni 42%, Fe 33%, Cr 25%; (3) Fe-Ni 38%, Fe 33%, Cr 25%. Tests carried out included microstructure, Vickers hardness, and chemical composition. Microstructure testing showed that all specimens formed two main phases, namely ferrite and austenite. Hardness testing of the three specimens: (1) 217.70 HV; (2) 239.22 HV; (3) 221.52 HV. Chemical composition testing showed that all specimens had a Cr content of 19.7% - 22.3% and Ni 8.52% - 9.75%. Mapping of the chemical composition of each test specimen on the Schaeffler diagram shows that all specimens are in the duplex stainless steel region. Furthermore, specimen 2 shows the best phase balance with the highest hardness value of 239.22 HV. This study proves that local ferronickel can be used as an alternative alloying material in the production of duplex stainless steel.
Coloring of master brake cover accessories (CNC products) using the anodizing method with natural mangosteen peel dye Wicaksono, Arif Budi; Faisal Arif, Nurgesang; Vicky Teno, Ardianto
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/5kpe3649

Abstract

This research focuses on the coloring of brake master cover (CNC products) using anodizing method with natural dye from mangosteen peel (Garcinia mangostana L.). The utilization of natural dyes aims to replace synthetic dyes that have the potential to negatively impact the environment. In this study, aluminum samples were used as substrates, which were then subjected to anodizing process with variations in voltage and electrolysis time. Mangosteen peel extract was obtained through a simple extraction method and used as a coloring solution. Tests carried out include color characterization, corrosion resistance, and adhesion of the dye layer on the aluminum surface. The results showed that mangosteen peel natural dye can provide an even color on the surface of anodized aluminum, with varying color intensity depending on the process parameters. In addition, the resulting coating has good corrosion resistance and strong adhesion. Thus, this method has potential as an environmentally friendly alternative in the coloring of aluminum-based products.
Investigation of chessboard scanning strategy in selective laser melting of ti6al4v Amirah Salsabila Widad Putri; Supriadi, Sugeng; Suharno, Bambang
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/j8jemj90

Abstract

Selective Laser Melting (SLM) is recognized as a technology capable of producing metallic components with advantages in geometric flexibility and consistency of mechanical properties. mong the various alloys processed through SLM, titanium alloy Ti6Al4V is particularly attractive due to its superior strength-to-weight ratio, corrosion resistance, and thermal stability. Nevertheless, the quality of as-SLM Ti6Al4V parts is strongly affected by the selection of process parameters. In particular, the laser scanning strategy plays a decisive role in governing energy distribution, thermal gradients, and subsequent microstructural evolution during fabrication. One of the scanning approaches, the chessboard strategy, has gained significant attention because it subdivides the building area into smaller islands that are scanned alternately, reducing scan length and promoting more uniform heat distribution. This study investigates the application of the chessboard strategy in fabricating cylindrical Ti6Al4V specimens, with process maintained constantly. The fabricated geometry exhibited good agreement with the original design, confirming the capability of SLM to reproduce complex features under controlled conditions. Surface characterization revealed protrusions on the top surface (upskin), attributed to excess energy accumulation at the end of scan tracks, while fine wavy-bulgy patterns were observed on the lateral surfaces due to overlapping melt pools and re-solidified particles. The measured average surface roughness (Ra) was 4.275 ± 0.655 µm, falling within an acceptable range for SLM-fabricated components. In addition, scanning electron microscopy (SEM) analysis revealed the presence of lack-of-fusion porosity, indicating localized imperfections in powder melting and consolidation. Overall, the findings highlight that the chessboard scanning strategy not only influences thermal distribution but also directly affects surface morphology and porosity characteristics, providing essential insights for optimizing as-SLM Ti6Al4V.
Pengembangan gear dengan proses additive manufacturing berbasis lattice structure dengan dimensi variasional Indriyana, Vynna Alviolina; Kiswanto, Gandjar; Irwansyah, Ridho
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/rpb15d50

Abstract

Gears are fundamental components in mechanical systems, where reducing weight without compromising strength is a key engineering challenge. This study introduces a multi-material gear with a lattice structure fabricated by Additive Manufacturing (AM). The design integrates an outer gear of Ti-6Al-4V for high strength and wear resistance with an inner gear of 316L stainless steel for structural support. Weight reduction was achieved by generating a diamond wire cube lattice with variable strut diameters, optimized using stress distribution data from finite element analysis and clustering with the K-means algorithm. Structural analysis through ANSYS Explicit Dynamics and fatigue simulations confirmed that stresses remained below the ultimate tensile strength of both materials, ensuring reliable service life. Thermal analysis with CFD indicated a maximum operating temperature of 64.1 °C, within the typical gear range of 50–140 °C. The proposed design reduces gear mass by 34.8% compared to a solid model, demonstrating the feasibility of multi-material AM with lattice optimization for lightweight and durable gear applications. 
Towards a framework for early cost estimation based on process complexity index for machined components Hendri DS Budiono; Wahyu Purnawirawan; Jos Istiyanto; Gerry Liston Putra
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/3s21w125

Abstract

Preliminary cost estimating is a pivotal element in ascertaining the competitive viability of manufacturing sectors. The initial design phase, when comprehensive information on methods and standards remains significantly constrained, allocates approximately 70–80% of overall manufacturing expenses. This paper presents a conceptual framework for preliminary cost assessment grounded in process complexity indices, specifically targeting machined components. The framework is constructed using a modular approach comprising three primary components: CAD/CAM system, analysis module, and reference module. The CAD/CAM system module extracts geometric data from CAD models, classifies manufacturing aspects, and delineates product complexity attributes. The Analyzing Module encompasses manufacturability assessment, production duration estimation, cost calculation, and evaluations of product and process complexity. The Reference Module offers auxiliary databases, encompassing machine cost rates, labor expenses, tool specs, manufacturing process repositories, and complexity databases. The integration of these three modules facilitates more precise cost estimation, especially in the absence of specific production information. A literature analysis demonstrates that feature recognition methods—geometry-based, rule-based, graph-based, and hybrid—can be integrated to enhance this system. The suggested framework aims to enhance the dependability of early design-stage forecasts by including complexity traits into cost estimates, hence establishing a basis for the creation of more adaptive and automated cost estimation systems suited to contemporary manufacturing requirements.
Production of durian seed starch-based bioplastic reinforced with pineapple leaf fiber cellulose Nawangsari, Putri
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/gdg1xq40

Abstract

Petroleum-based plastics are a significant source of pollutants, contributing to environmental problems, human health issues, and potential ecosystem damage. The developed bioplastics from renewable resources offer an alternative material to petroleum-based plastics. This study aims to investigate the feasibility of producing bioplastic from durian seed starch reinforced with cellulose from pineapple leaf fibers. The composition ratio of starch and cellulose is 100:0; 99:1; 98:2, 97:3; 96:4; and 95:5 vol % using glycerol as a plasticizer at 20% (wt/v) of glycerol to starch. Bioplastics were fabricated through the phase inversion method. Durian seed starch solution, cellulose, and glycerol were mixed using a hot plate magnetic stirrer for 30 minutes. The mixtures were poured into a flat mold and were dried in the oven at a temperature of 100 °C for 90 minutes. Analysis of bioplastic includes tensile strength, water absorption, and biodegradation. The tensile test and water absorption test were referred to ASTM 638 14 and ASTM D 570, respectively. The results reveal that an increasing volume fraction of (1-4% vol) cellulose in bioplastic-based durian seed starch enhances the tensile strength and biodegradation. Conversely, it decreases in water absorption. The best results are found in bioplastic with a starch-to-cellulose ratio of 96:4% vol. The bioplastic has a tensile strength of 11.881 MPa, water absorption of 1.361%, and biodegradation of 67.3 in 10 days
The influence of pulse-on time and pulse-off time to hardness of aluminum 7075 processed by electrical discharge machining Ma'arif, Moch. Syamsul; Firdaus, Abu Rizal; Bintarto, Redi; Aisyah, Iis Siti
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/ydapnm85

Abstract

This study search at the the hardness of 7075 Aluminum alloy processed in EDM machining by varying pulse-on time and pulse-off time. This study uses an Electrical Discharge Machining (EDM) of C-TEK ZNC 320 Series and the specimens is tested for hardness by a Rockwell Hardness Tester. The material used is Aluminum 7075. EDM is chosen as because it does not require deformation force to perform machining process and suitable for machining of materials that are elastic, easy to form and have high thermal conductivity such as aluminum 7075. The electrode used is copper (Cu) with a diameter of 25.4 mm and a length of 50 mm. The process parameters used are pulse-on time: 50 μs, 75 μs, 100 μs and pulse-off time: 4 μs, 6 μs, 9 μs. The data are consisted of 9 specimens (cells). The results of the average hardness measurements from experiments 1 and 9 are: 28.03 HBR, and 50.80 HBR. Analysis of variance (Anova) shows the calculated F value is 71.55, the
Comparative performance of submerged and non-submerged pico-Scale crossflow water turbine Alifarsya Ihsan Maulana; Warjito; Budiarso
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/d1gjke23

Abstract

Indonesia’s abundant renewable energy potential. has driven the nation to shift toward clean energy, including small-scale hydropower systems like picohydro. With capacities under 5 kW, picohydro systems are ideal for remote areas due to their simplicity and low operational costs. Crossflow turbines are commonly used for their efficiency under low-head and fluctuating-flow conditions. This study compares turbine performance under three submergence conditions: unsubmerged, partially submerged, and fully submerged. Two methods were employed: analytical calculations (based on velocity triangles to determine speed, torque, and efficiency) and numerical simulations using CFD software ANSYS Fluent. The turbine geometry was modeled in Autodesk Inventor, with a focus on key performance parameters such as torque, power output, and efficiency. Results show that submergence level significantly affects turbine performance. The unsubmerged condition yielded the highest efficiency and power output, as the nozzle flow enters without downstream fluid resistance, allowing optimal energy transfer to the blades. In contrast, partial and full submergence introduced backpressure zones, air pockets, and vortices that increased drag and reduced net torque. Although absolute torque tended to rise due to greater fluid interaction, the RPM decreased, and energy losses increased, resulting in reduced overall power and efficiency.
Design and implementation of TOF (Tool Open Fan) to improve maintenance efficiency of exhaust fan in gland steam condenser at steam power plants Sajaah, Deden Mamun; Aulia Ramadhan; Dodi Sofyan Arief
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/xh6jk497

Abstract

This paper presents the design and implementation of TOF (Tool Open Fan) as an innovative solution to enhance the maintenance efficiency of exhaust fans in gland steam condensers (GSC) at coal-fired steam power plants. Conventional disassembly using puller tools often caused mechanical damage to the fan surface, leading to costly replacements and downtime of up to 38 days. The TOF tool was designed with an adjustable house, fix house, and jack bolt mechanism to provide safe, ergonomic, and efficient fan disassembly. Finite element simulations were conducted to analyze stress distribution on both the tool and the fan. Implementation at PLTU Tenayan demonstrated a significant reduction in maintenance duration, from 9 hours to 3 minutes, and reduced manpower from five to two workers. Financially, the innovation generated a saving of approximately IDR 104,500,000 per exhaust fan by avoiding unnecessary replacement. The study concludes that TOF offers both economic and safety benefits, contributing to power plant reliability and sustainable maintenance practices. Limitations include the need for further design adjustments for compatibility with different GSC configurations across power plants.

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