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All Journal International Journal of Renewable Energy Development Jurnal Teknik ITS IPTEK Journal of Proceedings Series JMES The International Journal of Mechanical Engineering and Sciences Sewagati International Journal of Renewable Energy Development JIPOWER : Journal of Intellectual Power
Arif Wahjudi
Department Of Mechanical Engineering, Institut Teknologi Sepuluh Nopember
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Optimization of 3D Printing Parameter Process for Product Tensile Strength from PLA Materials Using the Taguchi Method I Made Londen Batan; Arleta Listiyana Chandradewi; Arif Wahjudi; Dinny Harnany
JMES The International Journal of Mechanical Engineering and Sciences Vol 7, No 2 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i2.16985

Abstract

Three-dimensional printing or 3D Printing is one of the revolutionary machines in addictive manufacturing techniques to create three-dimensional objects with complex structures. Until now there are many techniques in 3D printing, one of which is Fused Deposition Modeling (FDM), which is currently widely used because of its ease and low operational costs. However, in the printing process, there are important things that must receive attention, namely the process parameters. Because this is what really determines the quality of the printout. In this research, an analysis of the effect of process parameters such as: infill rate, infill pattern, extrusion temperature and layer thickness were carried out on the tensile strength of the printed product. The method used is the Taguchi method with the Orthogonal Array L 9 (3 4) experimental design. Three tensile test specimens were printed for each variation using a Cubic Chiron 3D printer, so a total of 27 specimens were printed. All specimens were tensile tested according to ASTM D638 standard, the results were analysed based on the average value and signal to ratio (SNR) value and their significance by analysis of variance (ANOVA). The results of the analysis show that the infill rate, infill pattern and layer thickness have a significant effect on the tensile strength of the printing results. The optimal value of the tensile strength is 56,876 MPa, occurs in the concentric pattern with an infill rate of 90%, and a layer thickness of 0.2 mm. From the confirmation test, the confidence interval values were obtained from 55,477 MPa to 58,275 MPa, meaning that the optimal predictive value was not significantly different from the confirmation test value.
Effect of Adding Combustion Air on Emission in a Diesel Dual-Fuel Engine with Crude Palm Oil Biodiesel Compressed Natural Gas Fuels Dori Yuvenda; Bambang Sudarmanta; Arif Wahjudi; Rozy Aini Hirowati
International Journal of Renewable Energy Development Vol 11, No 3 (2022): August 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.41275

Abstract

A diesel dual-fuel engine uses two fuels designed to reduce the consumption of fossil fuels. Generally, the specific fuel consumption of diesel dual-fuel engines has increased.  However, in   combination with alternative fuels, namely compressed natural gas injected through air intake, the use of diesel fuel can be reduced. However, using two fuels in a diesel dual-fuel engine increases the equivalent ratio; therefore, the air and fuel mixture becomes richer because the air entering the cylinder during the intake stroke is partially replaced by compressed natural gas. This results in incomplete combustion and increases exhaust emissions, particularly hydrocarbon (HC) and carbon monoxide (CO) emissions. This study aims to improve the combustion process in dual-fuel diesel engines by improving the air-fuel ratio; thus, it can approach the stoichiometric mixture by adding combustion air forcibly to produce complete combustion to reduce CO and HC emissions. An experimental approach using a single-cylinder diesel engine modified into a diesel dual-fuel engine powered by crude palm oil biodiesel and compressed natural gas was adopted. The combustion air was forcibly added to the cylinder using an electric supercharger at different air mass flow rates ranging from 0.007074 to 0.007836 kg/s and different engine loads (1000 to 4000 watts). The results indicated that adding more air to the cylinder could produce complete combustion, reducing the emission levels produced by a diesel dual-fuel engine. An air mass flow rate of 0.007836 kg/s can reduce CO, HC, and particulate matter emissions by averages of 60.55%, 49.63%, and 86.87%, respectively, from the standard diesel dual-fuel engine. Increasing in the amount of oxygen concentration improves the quality of the air-fuel ratio, which results in improved combustion and thereby reducing emissions.
OPTIMIZATION OF WELDING PARAMETERS FOR DISSIMILAR MATERIALS WEAR PLATE HB500 AND AISI 318LN USING TAGUCHI METHOD Marga Yogatama; Arif Wahjudi
JIPOWER : Journal of Intellectual Power Vol. 2 No. 03 (2025): December 2025 - Maret 2026
Publisher : Yayasan Inspirasi Merah Putih Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63786/jipower.v1i03.56

Abstract

Welding dissimilar materials such as wear plate HB500 and duplex stainless steel AISI 318LN presents significant challenges due to the formation of brittle intermetallic phases, differences in thermal expansion, and residual stresses. This research aims to determine the optimal combination of welding parameters preheat temperature, electrode type, welding current, PWHT temperature, and PWHT holding time using the Taguchi L18 orthogonal array. Mechanical responses evaluated include tensile strength and impact toughness, which were combined using the Multi-Response Performance Index (MRPI). Experimental results indicate that PWHT temperature contributes most significantly to the combined mechanical response (44%), followed by electrode type (14%) and preheat temperature (12%). Welding current and PWHT time were statistically insignificant (p > 0.05). The optimal parameter combination determined through Taguchi analysis is electrode E2209, preheat 150°C, and PWHT 400°C. Confirmation tests produced an MRPI value of 0.833, which lies within the 95% confidence interval of predicted values (0.575–0.942). Thus, the Taguchi method demonstrated reliable predictive capability for optimizing welding parameters for dissimilar HB500–AISI 318LN joints.
Co-Authors Adi Soeprijanto Arleta Listiyana Chandradewi Bambang Sudarmanta Bara Atmaja Dedi Budi Purwanto Dimas Kunto Ariwibowo Dinny Harnani Dinny Harnani Dinny Harnany Dinny Harnany Dinny Harnany Dori Yuvenda Eka Marliana Emilius Wahyu Fahmi Mubarok Fungky Dyan Pertiwi Hendro Nurhadi I Made Londen Batan I Made Londen Batan M. Khoirul Effendi Marga Yogatama Mohammad Khoirul Effendi Nurahmi, Latifah Rozy Aini Hirowati Sampurno Suhardjono Suhardjono Sylvia Ayu Pradanawati Thenny Daus Salamoni